10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x        QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31,2018

OR

¨        TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number 001-31721

AXIS CAPITAL HOLDINGS LIMITED

(Exact name of registrant as specified in its charter)

BERMUDA

(State or other jurisdiction of incorporation or organization)

98-0395986

(I.R.S. Employer Identification No.)

92 Pitts Bay Road, Pembroke, Bermuda HM 08

(Address of principal executive offices and zip code)

(441) 496-2600

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes  x    No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes  x  No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer", "accelerated filer", "smaller reporting company", and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer  x	Accelerated filer  ¨
Non-accelerated filer   ¨ (do not check if a smaller reporting company)	Smaller reporting company  ¨
	Emerging growth company   ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes  ¨  No  x

At May 12018, there were 83,518,960 Common Shares, $0.0125 par value per share, of the registrant outstanding.

AXIS CAPITAL HOLDINGS LIMITED

INDEX TO FORM 10-Q

		Page
	PART I
	Financial Information	3
Item 1.	Consolidated Financial Statements	5
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	48
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	85
Item 4.	Controls and Procedures	85
	PART II
	Other Information	85
Item 1.	Legal Proceedings	85
Item 1A.	Risk Factors	85
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	85
Item 5.	Other Information	86
Item 6.	Exhibits	86
	Signatures	88

2

PART I FINANCIAL INFORMATION

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of section 27A of the Securities Act of 1933 and section 21E of the Securities Exchange Act of 1934. We intend these forward-looking statements to be covered by the safe harbor provisions for forward-looking statements in the United States securities laws. In some cases, these statements can be identified by the use of forward-looking words such as "may”, "should”, "could", "anticipate", "estimate", "expect", "plan", "believe", "predict", "potential", and "intend". Forward-looking statements contained in this report may include information regarding our estimates of losses related to catastrophes and other large losses, measurements of potential losses in the fair value of our investment portfolio and derivative contracts, our expectations regarding the performance of our business, our financial results, our liquidity and capital resources and the outcome of our strategic initiatives, our expectations regarding estimated synergies and the success of the integration of acquired entities, our expectations regarding the estimated benefits and synergies relating to the Company's transformation program, our expectations regarding pricing and other market conditions, our growth prospects, and valuations of the potential impact of movements in interest rates, equity securities prices, credit spreads and foreign currency rates. Forward-looking statements only reflect our expectations and are not guarantees of performance.

These statements involve risks, uncertainties and assumptions. Accordingly, there are or will be important factors that could cause actual results to differ materially from those indicated in such statements. We believe that these factors include, but are not limited to the following:

• the cyclical nature of the re(insurance) business leading to periods with excess underwriting capacity and unfavorable premium rates,

• the occurrence and magnitude of natural and man-made disasters,

• losses from war, terrorism and political unrest or other unanticipated losses,

• actual claims exceeding our loss reserves,

• general economic, capital and credit market conditions,

• the failure of any of the loss limitation methods we employ,

• the effects of emerging claims, coverage and regulatory issues, including uncertainty related to coverage definitions, limits, terms and conditions,

• our inability to purchase reinsurance or collect amounts due to us,

• the breach by third parties in our program business of their obligations to us,

• difficulties with technology and/or data security,

• the failure of our policyholders and intermediaries to pay premiums,

• the failure of our cedants to adequately evaluate risks,

• inability to obtain additional capital on favorable terms, or at all,

• the loss of one or more key executives,

• a decline in our ratings with rating agencies,

• loss of business provided to us by our major brokers and credit risk due to our reliance on brokers,

• changes in accounting policies or practices,

• the use of industry catastrophe models and changes to these models,

• changes in governmental regulations and potential government intervention in our industry,

• failure to comply with certain laws and regulations relating to sanctions and foreign corrupt practices,

• increased competition,

• changes in the political environment of certain countries in which we operate or underwrite business including the United Kingdom's expected withdrawal from the European Union,

• fluctuations in interest rates, credit spreads, equity securities prices and/or currency values,

• the failure to successfully integrate acquired businesses or realize the expected synergies resulting from such acquisitions,

• the failure to realize the expected benefits or synergies relating to the Company's transformation program,

3

• changes in tax laws, and

• the other factors including but not limited to those set forth under Item 1A, 'Risk Factors' and Item 7, 'Management’s Discussion and Analysis of Financial Condition and Results of Operations' included in our Annual Report on Form 10-K for the year ended December 31, 2017.

We undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

4

ITEM 1.     CONSOLIDATED FINANCIAL STATEMENTS

	Page
Consolidated Balance Sheets at March 31, 2018 (Unaudited) and December 31, 2017	6
Consolidated Statements of Operations for the three months ended March 31, 2018 and 2017 (Unaudited)	7
Consolidated Statements of Comprehensive Income for the three months ended March 31, 2018 and 2017 (Unaudited)	8
Consolidated Statements of Changes in Shareholders' Equity for the three months ended March 31, 2018 and 2017 (Unaudited)	9
Consolidated Statements of Cash Flows for the three months ended March 31, 2018 and 2017 (Unaudited)	10
Notes to Consolidated Financial Statements (Unaudited)	11
Note 1 - Basis of Presentation and Significant Accounting Policies	11
Note 2 - Segment Information	15
Note 3 - Investments	17
Note 4 - Fair Value Measurements	27
Note 5 - Derivative Instruments	37
Note 6 - Reserve for Losses and Loss Expenses	40
Note 7 - Earnings Per Common Share	43
Note 8 - Share-Based Compensation	44
Note 9 - Shareholders' Equity	45
Note 10 - Debt and Financing Arrangements	46
Note 11 - Commitments and Contingencies	46
Note 12 - Other Comprehensive Income	46
Note 13 - Subsequent Events	47

5

AXIS CAPITAL HOLDINGS LIMITED

CONSOLIDATED BALANCE SHEETS

MARCH 31,2018 (UNAUDITED) AND DECEMBER 31,2017

	2018			2017
	(in thousands)
Assets
Investments:
Fixed maturities, available for sale, at fair value (Amortized cost 2018: $11,898,060; 2017: $12,611,219)	$	11,801,396		$	12,622,006
Equity securities, at fair value (Cost 2018: $374,091; 2017: $552,867)	435,742			635,511
Mortgage loans, held for investment, at amortized cost and fair value	364,769			325,062
Other investments, at fair value	1,009,587			1,009,373
Equity method investments	108,597			108,597
Short-term investments, at amortized cost and fair value	56,246			83,661
Total investments	13,776,337			14,784,210
Cash and cash equivalents	1,227,736			948,626
Restricted cash and cash equivalents	416,844			415,160
Accrued interest receivable	73,928			81,223
Insurance and reinsurance premium balances receivable	3,892,957			3,012,419
Reinsurance recoverable on unpaid and paid losses	3,129,303			3,338,840
Deferred acquisition costs	721,820			474,061
Prepaid reinsurance premiums	1,015,163			809,274
Receivable for investments sold	19,433			11,621
Goodwill	102,003			102,003
Intangible assets	253,808			257,987
Value of business acquired	150,936			206,838
Other assets	307,041			317,915
Total assets	$	25,087,309		$	24,760,177
Liabilities
Reserve for losses and loss expenses	$	12,034,643		$	12,997,553
Unearned premiums	4,659,858			3,641,399
Insurance and reinsurance balances payable	1,251,629			899,064
Senior notes and notes payable	1,376,835			1,376,529
Payable for investments purchased	144,315			100,589
Other liabilities	355,634			403,779
Total liabilities	19,822,914			19,418,913
Shareholders’ equity
Preferred shares	775,000			775,000
Common shares (shares issued 2018: 176,580; 2017: 176,580 shares outstanding 2018: 83,518; 2017: 83,161)	2,206			2,206
Additional paid-in capital	2,289,497			2,299,166
Accumulated other comprehensive income (loss)	(85,216		)	92,382
Retained earnings	6,076,294			5,979,666
Treasury shares, at cost (2018: 93,062; 2017: 93,419 shares)	(3,793,386		)	(3,807,156		)
Total shareholders’ equity	5,264,395			5,341,264
Total liabilities and shareholders’ equity	$	25,087,309		$	24,760,177

See accompanying notes to Consolidated Financial Statements.

6

AXIS CAPITAL HOLDINGS LIMITED

CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)

FOR THE THREE MONTHS ENDEDMARCH 31,2018 AND 2017

	Three months ended
	2018			2017
	(in thousands, except for per share amounts)
Revenues
Net premiums earned	$	1,167,402		$	938,703
Net investment income	100,999			98,664
Other insurance related income (losses)	6,606			(3,783		)
Net investment losses:
Other-than-temporary impairment ("OTTI") losses	(414		)	(6,553		)
Other realized and unrealized investment losses	(14,416		)	(18,497		)
Total net investment losses	(14,830		)	(25,050		)
Total revenues	1,260,177			1,008,534
Expenses
Net losses and loss expenses	661,345			606,942
Acquisition costs	229,260			189,792
General and administrative expenses	169,837			161,260
Foreign exchange losses	37,860			21,465
Interest expense and financing costs	16,763			12,791
Reorganization expenses	13,054			—
Amortization of value of business acquired	57,110			—
Amortization of intangibles	2,782			—
Total expenses	1,188,011			992,250
Income before income taxes and interest in income (loss) of equity method investments	72,166			16,284
Income tax benefit	1,036			9,337
Interest in loss of equity method investments	—			(5,766		)
Net income	73,202			19,855
Preferred share dividends	10,656			14,841
Net income available to common shareholders	$	62,546		$	5,014
Per share data
Net income per common share:
Basic net income	$	0.75		$	0.06
Diluted net income	$	0.75		$	0.06
Weighted average number of common shares outstanding - basic	83,322			86,022
Weighted average number of common shares outstanding - diluted	83,721			86,793
Cash dividends declared per common share	$	0.39		$	0.38

See accompanying notes to Consolidated Financial Statements.

7

AXIS CAPITAL HOLDINGS LIMITED

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

FOR THE THREE MONTHS ENDEDMARCH 31,2018 AND 2017

	Three months ended
	2018			2017
	(in thousands)
Net income	$	73,202		$	19,855
Other comprehensive income (loss), net of tax:
Available for sale investments:
Unrealized investment gains (losses) arising during the period	(112,191		)	67,703
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	785			24,968
Unrealized investment gains (losses) arising during the period, net of reclassification adjustment	(111,406		)	92,671
Foreign currency translation adjustment	1,270			29,869
Total other comprehensive income (loss), net of tax	(110,136		)	122,540
Comprehensive income (loss)	$	(36,934	)	$	142,395

See accompanying notes to Consolidated Financial Statements.

8

AXIS CAPITAL HOLDINGS LIMITED

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (UNAUDITED)

FOR THE THREE MONTHS ENDEDMARCH 31,2018 AND 2017

	2018			2017
	(in thousands)
Preferred shares
Balance at beginning and end of period	$	775,000		$	1,126,074
Common shares (par value)
Balance at beginning and end of period	2,206			2,206
Additional paid-in capital
Balance at beginning of period	2,299,166			2,299,857
Treasury shares reissued	(19,272		)	(37,363		)
Share-based compensation expense	9,603			14,177
Balance at end of period	2,289,497			2,276,671
Accumulated other comprehensive income (loss)
Balance at beginning of period	92,382			(121,841		)
Unrealized gains (losses) on available for sale investments, net of tax:
Balance at beginning of period	89,962			(82,323		)
Cumulative effect of adoption of ASU No. 2018-02	2,142			—
Cumulative effect of adoption of ASU No. 2016-01, net of taxes	(69,604		)	—
Unrealized gains (losses) arising during the period	(111,406		)	92,671
Balance at end of period	(88,906		)	10,348
Cumulative foreign currency translation adjustments, net of tax:
Balance at beginning of period	2,420			(39,518		)
Foreign currency translation adjustment	1,270			29,869
Balance at end of period	3,690			(9,649		)
Balance at end of period	(85,216		)	699
Retained earnings
Balance at beginning of period	5,979,666			6,527,627
Cumulative effect of adoption of ASU No. 2018-02	(2,142		)	—
Cumulative effect of adoption of ASU No. 2016-01, net of taxes	69,604			—
Net income	73,202			19,855
Preferred share dividends	(10,656		)	(14,841		)
Common share dividends	(33,380		)	(33,379		)
Balance at end of period	6,076,294			6,499,262
Treasury shares, at cost
Balance at beginning of period	(3,807,156		)	(3,561,553		)
Shares repurchased	(7,163		)	(151,242		)
Shares reissued	20,933			38,248
Balance at end of period	(3,793,386		)	(3,674,547		)
Total shareholders’ equity	$	5,264,395		$	6,230,365

See accompanying notes to Consolidated Financial Statements.

9

AXIS CAPITAL HOLDINGS LIMITED

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

FOR THE THREE MONTHS ENDEDMARCH 31,2018 AND 2017

	2018			2017
	(in thousands)
Cash flows from operating activities:
Net income	$	73,202		$	19,855
Adjustments to reconcile net income to net cash used in operating activities:
Net investment losses	8,909			25,050
Net realized and unrealized gains on other investments	(12,950		)	(18,211		)
Amortization of fixed maturities	9,895			12,498
Interest in loss of equity method investments	—			5,766
Other amortization and depreciation	68,397			6,467
Share-based compensation expense, net of cash payments	(1,481		)	(24,758		)
Non-cash foreign exchange losses	—			24,149
Changes in:
Accrued interest receivable	3,350			5,596
Reinsurance recoverable balances	(113,656		)	348,942
Deferred acquisition costs	(253,369		)	(171,493		)
Prepaid reinsurance premiums	(218,772		)	(86,534		)
Reserve for loss and loss expenses	184,511			(237,773		)
Unearned premiums	1,056,045			654,475
Insurance and reinsurance balances, net	(854,993		)	(559,456		)
Other items	(36,973		)	(40,834		)
Net cash used in operating activities	(87,885		)	(36,261		)
Cash flows from investing activities:
Purchases of:
Fixed maturities	(2,474,418		)	(2,670,518		)
Equity securities	(42,522		)	(98,559		)
Mortgage loans	(59,838		)	—
Other investments	(31,755		)	(63,742		)
Equity method investments	—			(1,000		)
Short-term investments	(57,688		)	(2,320		)
Proceeds from the sale of:
Fixed maturities	2,442,673			2,429,084
Equity securities	194,970			70,575
Other investments	44,493			131,777
Short-term investments	46,719			7,087
Proceeds from redemption of fixed maturities	319,526			521,716
Proceeds from redemption of short-term investments	16,022			111,931
Proceeds from the repayment of mortgage loans	20,237			10,233
Purchase of other assets	—			(4,427		)
Net cash provided by investing activities	418,419			441,837
Cash flows from financing activities:
Repurchase of common shares - open market	—			(120,549		)
Taxes paid on withholding shares	(7,163		)	(23,260		)
Dividends paid - common shares	(35,273		)	(38,541		)
Dividends paid - preferred shares	(10,656		)	(14,841		)
Net cash used in financing activities	(53,092		)	(197,191		)
Effect of exchange rate changes on foreign currency cash, cash equivalents, and restricted cash	3,354			1,678
Increase in cash, cash equivalents, and restricted cash	280,796			210,063
Cash, cash equivalents, and restricted cash - beginning of period	1,363,786			1,241,507
Cash, cash equivalents, and restricted cash - end of period	$	1,644,582		$	1,451,570

Supplemental disclosures of cash flow information: Consideration paid related to an agreement for the Reinsurance to Close ("RITC") of the 2015 and prior years of account of Syndicate 2007 was $688 million in the quarter of which $513 million was settled by transfer of securities and was treated as a non cash activity on the Consolidated Statement of Cash Flows. Also refer to Note 6 'Reserve for Losses and LossExpenses'.

See accompanying notes to Consolidated Financial Statements.

10

AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

These unaudited Consolidated Financial Statements (the "financial statements") have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") for interim financial information and with the U.S. Securities and Exchange Commission's ("SEC") instructions to Form 10-Q and Article 10 of Regulation S-X and include AXIS Capital Holdings Limited ("AXIS Capital") and its subsidiaries (the "Company"). Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. This Quarterly Report on Form 10-Q should be read in conjunction with the financial statements and related notes included in AXIS Capital's Annual Report on Form 10-K for the year ended December 31, 2017, as filed with the SEC.

In the opinion of management, these financial statements reflect all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the Company's financial position and results of operations for the periods presented.

The results of operations for any interim period are not necessarily indicative of the results for a full year. All inter-company accounts and transactions have been eliminated.

To facilitate comparison of information across periods, certain reclassifications have been made to prior year amounts to conform to the current year's presentation. These reclassifications did not impact results of operations, financial condition or liquidity.

Tabular dollar and share amounts are in thousands, except per share amounts. All amounts are reported in U.S. dollars.

Significant Accounting Policies

There was one notable change in our significant accounting policies subsequent to our Annual Report on Form 10-K for the year ended December 31, 2017.

a) Investments

Recognition and Measurement of Financial Assets and Financial Liabilities

Fixed maturities and equity securities are reported at fair value at the balance sheet date (see Note 4 'Fair Value Measurements'). Effective January 1, 2018, the Company adopted ASU 2016-01 "Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities," which requires:

• equity investments (except those accounted for under the equity method of accounting, investments that are consolidated or those that meet a practicability exception) to be measured at fair value with changes in fair value recognized in net income,

• simplifies the impairment assessment of equity investments without readily determinable values by requiring a qualitative assessment to identify impairment, eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost,

• requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes,

• requires separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the organization has elected to measure the liabilities in accordance with the fair value option,

• requires the separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and

• clarifies that the reporting organization should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the organization’s other deferred tax assets.

Upon adoption of this guidance, net unrealized gains on equity securities of $70 million, net of deferred income taxes of $13 million, were reclassified from accumulated other comprehensive income into retained earnings. As prescribed, the prior period has not been restated to conform to the current presentation.

11

AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

New Accounting Standards Adopted in 2018

Revenue From Contracts With Customers

Effective January 1, 2018, the Company adopted Accounting Standards Update ("ASU" ) 2014-09 "Revenue from Contracts with Customers (Topic 606)," using the modified retrospective transition approach. This guidance affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards, such as accounting for insurance contracts. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.

The Company generated fee income of $10 million for the three months ended March 31, 2018 which is within the scope of this ASU. These fees represents service fees and reimbursement of expenses earned by the Company's reinsurance segment related to services provided to its strategic capital partners. These fees are recognized when the related services have been performed and are reported in other insurance related income (losses) in the Consolidated Statements of Operations. Given that the timing and measurement of revenue associated with impacted contracts did not change, the adoption of this guidance did not have a material impact on the Company's results of operations, financial condition and liquidity.

Classification of Certain Cash Receipts and Cash Payments

Effective January 1, 2018, the Company adopted ASU 2016-15, "Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments," which addresses diversity in practice in how eight specific cash receipts and cash payments should be presented and classified on the statement of cash flows. The adoption of this guidance did not impact the Company's results of operations, financial condition and liquidity.

Restricted Cash

Effective January 1, 2018, the Company adopted ASU 2016-18, "Statement of Cash Flows (Topic 230) - Restricted Cash," which addresses diversity in practice in the classification and presentation of changes in restricted cash on the statement of cash flows. This guidance requires a statement of cash flows to explain the change during the period in the total of cash, cash equivalents, restricted cash and restricted cash equivalents. Transfers between cash and cash equivalents and restricted cash and restricted cash equivalents will no longer be presented on the statement of cash flows. To facilitate comparison of the Company's Consolidated Statements of Cash Flows, the Company adopted this guidance utilizing the full retrospective approach for all periods presented in the Company's Consolidated Financial Statements. As a result, the Company's Consolidated Statements of Cash Flows now explains the change during the period in the total of cash, cash equivalents, and restricted cash. Therefore, restricted cash is now included with cash and cash equivalents in the reconciliation of the beginning of period and end of period total amounts shown on the statement of cash flows. The adoption of this guidance did not impact the Company's results of operations, financial condition and liquidity.

Stock Compensation - Scope of Modification Accounting

Effective January 1, 2018, the Company adopted ASU 2017-09 "Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting," which provides clarity and reduces diversity in practice of applying the guidance in Topic 718 to a change to the terms or conditions of a share-based payment award. This ASU provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The guidance states that an entity should account for the effects of a modification unless all the following are met:

1. the fair value of the modified award is the same as the fair value of the original award immediately before the original award is modified;

2. the vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified; and the classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified.

12

AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this Update. The adoption of this guidance did not impact the Company's results of operations, financial condition and liquidity.

Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

Effective January 1, 2018, the Company adopted ASU 2018-02 "Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" which was a response to a financial reporting issue that arose as a consequence of the U.S. federal government tax bill, H.R.1, An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018 ("U.S. Tax Reform"), which was enacted on December 22, 2017.

U.S. GAAP currently requires deferred tax liabilities and assets to be adjusted for the effect of a change in tax laws or rates with the effect included in income from continuing operations in the reporting period that includes the enactment date. This guidance is applicable even in situations in which the related income tax effects of items in accumulated other comprehensive income were originally recognized in other comprehensive income rather than in income from continuing operations. As the adjustment of deferred taxes due to the reduction of the historical corporate income tax rate to the newly enacted corporate income tax rate is required to be included in income from continuing operations, the tax effects of items within accumulated other comprehensive income (referred to as stranded tax effects for purposes of this Update) do not reflect the appropriate tax rate.

The amendments in this Update allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from U.S. Tax Reform. Consequently, the amendments eliminate the stranded tax effects resulting from U.S. Tax Reform and will improve the usefulness of information reported to financial statement users. However, because the amendments only relate to the reclassification of the income tax effects of U.S. Tax Reform, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected.

As a consequence of U.S. Tax Reform, the Company recognized a tax benefit of $2 million related to the revaluation of net deferred tax liabilities associated with the reduction in the U.S. corporate income tax rate from 35% to 21%, attributable to net unrealized investment gains associated with investments held by the Company's U.S. domiciled entities. Upon adoption of this guidance, the tax benefit of $2 million was reclassified from accumulated other comprehensive income into retained earnings.

Recently Issued Accounting Standards Not Yet Adopted

Leases

In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)" which provides a new comprehensive model for lease accounting. The guidance will require a lessee to recognize a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the impact of this guidance on the Company's results of operations, financial condition and liquidity.

Measurement of Credit Losses on Financial Instrument

In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments" which replaces the "incurred loss" impairment methodology with an approach based on "expected losses" to estimate credit losses on certain types of financial instruments and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The guidance requires financial assets measured at amortized cost to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost of the financial asset to present the net carrying value at the amount expected to be collected on the financial asset. Credit losses relating to available-for-sale debt securities will be recorded through an allowance for credit losses. The guidance also provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. This guidance is effective for interim and annual periods beginning after December 15, 2019. Early adoption is permitted for interim and annual periods beginning after December 15, 2018. The Company is currently evaluating the impact of this guidance on its results of operations, financial condition and liquidity.

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1. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment" that eliminates the requirement to calculate the implied fair value of goodwill (i.e., Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, an impairment charge will be based on the excess of a reporting unit's carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current goodwill impairment test). This guidance is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019, with early adoption permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The guidance will be adopted on a prospective basis.

Premium Amortization on Purchased Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08 "Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20) - Premium Amortization on Purchased Callable Debt Securities" which shortens the amortization period for certain purchased callable debt securities held at a premium. This guidance is effective for interim and annual reporting periods, beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the impact of this guidance on our results of operations, financial condition and liquidity.

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2. SEGMENT INFORMATION

AXIS Capital's underwriting operations are organized around its global underwriting platforms, AXIS Insurance and AXIS Re. The Company has determined that it has two reportable segments, insurance and reinsurance. The Company does not allocate its assets by segment, with the exception of goodwill and intangible assets, as it evaluates the underwriting results of each segment separately from the results of its investment portfolio.

During the three months ended March 31, 2018, the Company realigned its accident and health business by integrating this business and its operations into the Company's insurance and reinsurance segments. Financial results relating to the Company's accident and health line of business were previously included in the Company's insurance segment. As a result of the realignment, accident and health results are included in the results of both the insurance and reinsurance segments of the Company with effect from January 1, 2018.

Insurance

The Company's insurance segment offers specialty insurance products to a variety of niche markets on a worldwide basis. The product lines in this segment are property, marine, terrorism, aviation, credit and political risk, professional lines, liability, accident and health, together with discontinued lines, which represents lines of business that Novae Group plc ("Novae") exited or placed into run-off in the three month period ended December 31, 2016 and in the three month period ended March 31, 2017.

Reinsurance

The Company's reinsurance segment provides non-life treaty reinsurance to insurance companies on a worldwide basis. The product lines in this segment are catastrophe, property, professional lines, credit and surety, motor, liability, agriculture, engineering, marine and other, accident and health, together with discontinued lines, which represents lines of business that Novae exited or placed into run-off in the three month period ended December 31, 2016 and in the three month period ended March 31, 2017. The reinsurance segment also wrote derivative based risk management products designed to address weather and commodity price risks until July 1, 2017.

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2. SEGMENT INFORMATION (CONTINUED)

The following tables present the underwriting results of the Company's reportable segments, as well as the carrying values of allocated goodwill and intangible assets:

	2018									2017
Three months ended and at March 31,	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written	$	880,848		$	1,781,947		$	2,662,795		$	545,261		$	1,366,610		$	1,911,871
Net premiums written	547,893			1,437,978			1,985,871			356,836			1,152,122			1,508,959
Net premiums earned	580,059			587,343			1,167,402			391,964			546,739			938,703
Other insurance related income (losses)	620			5,986			6,606			42			(3,825		)	(3,783		)
Net losses and loss expenses	(321,538		)	(339,807		)	(661,345		)	(241,085		)	(365,857		)	(606,942		)
Acquisition costs	(87,329		)	(141,931		)	(229,260		)	(54,004		)	(135,788		)	(189,792		)
General and administrative expenses	(102,370		)	(37,296		)	(139,666		)	(85,256		)	(36,545		)	(121,801		)
Underwriting income	$	69,442		$	74,295		143,737			$	11,661		$	4,724		16,385
Corporate expenses							(30,171		)							(39,459		)
Net investment income							100,999									98,664
Net investment losses							(14,830		)							(25,050		)
Foreign exchange losses							(37,860		)							(21,465		)
Interest expense and financing costs							(16,763		)							(12,791		)
Reorganization expenses							(13,054		)							—
Amortization of value of business acquired							(57,110		)							—
Amortization of intangibles							(2,782		)							—
Income before income taxes and interest in income (loss) of equity method investments							$	72,166								$	16,284
Net loss and loss expense ratio	55.4		%	57.9		%	56.7		%	61.5		%	66.9		%	64.7		%
Acquisition cost ratio	15.1		%	24.2		%	19.6		%	13.8		%	24.8		%	20.2		%
General and administrative expense ratio	17.6		%	6.3		%	14.5		%	21.8		%	6.7		%	17.2		%
Combined ratio	88.1		%	88.4		%	90.8		%	97.0		%	98.4		%	102.1		%
Goodwill and intangible assets	$	506,747		$	—		$	506,747		$	84,613		$	—		$	84,613

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3. INVESTMENTS

a)     Fixed Maturities and Equity securities

Fixed maturities

The amortized cost and fair values of the Company's fixed maturities classified as available for sale were as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Non-credit OTTI in AOCI(5)
At March 31, 2018
Fixed maturities
U.S. government and agency	$	1,821,951	$	908	$	(25,894	)	$	1,796,965	$	—
Non-U.S. government	649,396		21,084		(9,256		)	661,224		—
Corporate debt	4,670,815		40,698		(71,082		)	4,640,431		—
Agency RMBS(1)	1,956,394		4,644		(46,193		)	1,914,845		—
CMBS(2)	1,042,704		1,964		(14,047		)	1,030,621		—
Non-Agency RMBS	39,930		1,997		(530		)	41,397		(866		)
ABS(3)	1,566,484		4,932		(4,718		)	1,566,698		—
Municipals(4)	150,386		781		(1,952		)	149,215		—
Total fixed maturities	$	11,898,060	$	77,008	$	(173,672	)	$	11,801,396	$	(866	)
At December 31, 2017
Fixed maturities
U.S. government and agency	$	1,727,643	$	1,735	$	(16,909	)	$	1,712,469	$	—
Non-U.S. government	798,582		17,240		(9,523		)	806,299		—
Corporate debt	5,265,795		61,922		(29,851		)	5,297,866		—
Agency RMBS(1)	2,414,720		8,132		(27,700		)	2,395,152		—
CMBS(2)	776,715		4,138		(3,125		)	777,728		—
Non-Agency RMBS	45,713		1,917		(799		)	46,831		(853		)
ABS(3)	1,432,884		5,391		(1,994		)	1,436,281		—
Municipals(4)	149,167		1,185		(972		)	149,380		—
Total fixed maturities	$	12,611,219	$	101,660	$	(90,873	)	$	12,622,006	$	(853	)

(1) Residential mortgage-backed securities ("RMBS") originated by U.S. government-sponsored agencies.

(2) Commercial mortgage-backed securities ("CMBS").

(3) Asset-backed securities (ABS) include debt tranched securities collateralized primarily by auto loans, student loans, credit card receivables collateralized debt obligations ("CDOs") and collateralized loan obligations ("CLOs").

(4) Municipals include bonds issued by states, municipalities and political subdivisions.

(5) Represents the non-credit component of the other-than-temporary impairment ("OTTI") losses, adjusted for subsequent sales, maturities and redemptions. It does not include the change in fair value subsequent to the impairment measurement date.

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3. INVESTMENTS (CONTINUED)

Equity Securities

The cost and fair values of the Company's equity securities were as follows:

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
At March 31, 2018
Equity securities
Common stocks	$	23,251	$	1,668	$	(977	)	$	23,942
Exchange-traded funds	211,301		51,843		(514		)	262,630
Bond mutual funds	139,539		9,631		—			149,170
Total equity securities	$	374,091	$	63,142	$	(1,491	)	$	435,742
At December 31, 2017
Equity securities
Common stocks	$	22,836	$	3,412	$	(590	)	$	25,658
Exchange-traded funds	356,252		71,675		(294		)	427,633
Bond mutual funds	173,779		9,440		(999		)	182,220
Total equity securities	$	552,867	$	84,527	$	(1,883	)	$	635,511

In the normal course of investing activities, the Company actively manages allocations to non-controlling tranches of structured securities (variable interests) issued by Variable Interest Entities ("VIEs"). These structured securities include RMBS, CMBS and ABS . The Company also invests in limited partnerships (hedge funds, direct lending funds, private equity funds and real estate funds) and CLO equity tranched securities, which are all variable interests issued by VIEs (see Note 3(c) 'Other Investments'). The Company does not have the power to direct the activities that are most significant to the economic performance of the VIEs therefore the Company is not the primary beneficiary of any of these VIEs. The maximum exposure to loss on these interests is limited to the amount of investment by the Company. The Company has not provided financial or other support with respect to these structured securities other than the original investment.

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3. INVESTMENTS (CONTINUED)

Contractual Maturities

Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The contractual maturities of fixed maturities are shown below:

	Amortized Cost		Fair Value		% of Total Fair Value
At March 31, 2018
Maturity
Due in one year or less	$	513,226	$	507,980	4.3	%
Due after one year through five years	4,642,999		4,626,323		39.2	%
Due after five years through ten years	1,942,501		1,911,664		16.2	%
Due after ten years	193,822		201,868		1.7	%
	7,292,548		7,247,835		61.4	%
Agency RMBS	1,956,394		1,914,845		16.2	%
CMBS	1,042,704		1,030,621		8.7	%
Non-Agency RMBS	39,930		41,397		0.4	%
ABS	1,566,484		1,566,698		13.3	%
Total	$	11,898,060	$	11,801,396	100.0	%
At December 31, 2017
Maturity
Due in one year or less	$	486,659	$	484,663	3.8	%
Due after one year through five years	4,906,207		4,912,189		38.9	%
Due after five years through ten years	2,338,964		2,350,433		18.6	%
Due after ten years	209,357		218,729		1.7	%
	7,941,187		7,966,014		63.0	%
Agency RMBS	2,414,720		2,395,152		19.0	%
CMBS	776,715		777,728		6.2	%
Non-Agency RMBS	45,713		46,831		0.4	%
ABS	1,432,884		1,436,281		11.4	%
Total	$	12,611,219	$	12,622,006	100.0	%

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3. INVESTMENTS (CONTINUED)

Gross Unrealized Losses

The following table summarizes fixed maturities and equity securities in an unrealized loss position and the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:

	12 months or greater					Less than 12 months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
At March 31, 2018(1)
Fixed maturities
U.S. government and agency	$	179,214	$	(7,184	)	$	1,219,143	$	(18,710	)	$	1,398,357	$	(25,894	)
Non-U.S. government	47,017		(4,693		)	214,545		(4,563		)	261,562		(9,256		)
Corporate debt	335,415		(15,212		)	2,853,336		(55,870		)	3,188,751		(71,082		)
Agency RMBS	603,008		(24,241		)	1,011,088		(21,952		)	1,614,096		(46,193		)
CMBS	29,098		(1,272		)	684,264		(12,775		)	713,362		(14,047		)
Non-Agency RMBS	8,089		(453		)	108,548		(77		)	116,637		(530		)
ABS	43,804		(455		)	547,077		(4,263		)	590,881		(4,718		)
Municipals	11,101		(375		)	93,140		(1,577		)	104,241		(1,952		)
Total fixed maturities	$	1,256,746	$	(53,885	)	$	6,731,141	$	(119,787	)	$	7,987,887	$	(173,672	)
At December 31, 2017
Fixed maturities
U.S. government and agency	$	194,916	$	(5,963	)	$	1,389,792	$	(10,946	)	$	1,584,708	$	(16,909	)
Non-U.S. government	62,878		(6,806		)	204,110		(2,717		)	266,988		(9,523		)
Corporate debt	407,300		(11,800		)	2,041,845		(18,051		)	2,449,145		(29,851		)
Agency RMBS	759,255		(17,453		)	1,172,313		(10,247		)	1,931,568		(27,700		)
CMBS	31,607		(703		)	348,943		(2,422		)	380,550		(3,125		)
Non-Agency RMBS	8,029		(788		)	4,197		(11		)	12,226		(799		)
ABS	57,298		(570		)	392,170		(1,424		)	449,468		(1,994		)
Municipals	11,230		(269		)	65,632		(703		)	76,862		(972		)
Total fixed maturities	$	1,532,513	$	(44,352	)	$	5,619,002	$	(46,521	)	$	7,151,515	$	(90,873	)
Equity securities
Common stocks	$	—	$	—		$	3,202	$	(590	)	$	3,202	$	(590	)
Exchange-traded funds	—		—			12,323		(294		)	12,323		(294		)
Bond mutual funds	—		—			12,184		(999		)	12,184		(999		)
Total equity securities	$	—	$	—		$	27,709	$	(1,883	)	$	27,709	$	(1,883	)

(1) Effective January 1, 2018, the Company adopted ASU No. 2016-01 which requires equity securities to be measured at fair value with changes in fair value recognized in net income therefore equity securities at fair value are excluded from the table above at March 31, 2018.

Fixed Maturities

At March 31,2018, 2,940 fixed maturities (2017: 2,424) were in an unrealized loss position of $174 million (2017: $91 million), of which $11 million (2017: $7 million) was related to securities below investment grade or not rated.

At March 31,2018, 555 fixed maturities (2017: 627) had been in a continuous unrealized loss position for twelve months or greater and had a fair value of $1,257 million (2017: $1,533 million). Following a credit impairment review, it was concluded that these securities as well as the remaining securities in an unrealized loss position were temporarily impaired at March 31,2018, and were expected to recover in value as the securities approach maturity. At March 31,2018, the Company did not intend to sell the securities

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3. INVESTMENTS (CONTINUED)

in an unrealized loss position and it is more likely than not that the Company will not be required to sell these securities before the anticipated recovery of their amortized costs.

b) Mortgage Loans

The following table provides a breakdown of the Company's mortgage loans held-for-investment:

	March 31, 2018				December 31, 2017
	Carrying Value		% of Total		Carrying Value		% of Total
Mortgage Loans held-for-investment:
Commercial	$	364,769	100	%	$	325,062	100	%
	364,769		100	%	325,062		100	%
Valuation allowances	—		—	%	—		—	%
Total Mortgage Loans held-for-investment	$	364,769	100	%	$	325,062	100	%

The primary credit quality indicator for commercial mortgage loans is the debt service coverage ratio which compares a property’s net operating income to amounts needed to service the principal and interest due under the loan, (generally, the lower the debt service coverage ratio, the higher the risk of experiencing a credit loss) and the loan-to-value ratio which compares the unpaid principal balance of the loan to the estimated fair value of the underlying collateral (generally, the higher the loan-to-value ratio, the higher the risk of experiencing a credit loss). The debt service coverage ratio and loan-to-value ratio, as well as the values utilized in calculating these ratios, are updated annually, on a rolling basis.

The Company has a high quality mortgage loan portfolio with weighted average debt service coverage ratios in excess of 2.9x and weighted average loan-to-value ratios of less than 60%. At March 31,2018 there are no credit losses associated with the commercial mortgage loans held by the Company.

At March 31,2018, there are no past due amounts.

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3. INVESTMENTS (CONTINUED)

c) Other Investments

The following tables provide a breakdown of the Company's other investments, together with additional information relating to the liquidity of each category:

	Fair Value				Redemption Frequency (if currently eligible)	Redemption     Notice Period
At March 31, 2018
Long/short equity funds	$	25,489	3	%	Annually	60 days
Multi-strategy funds	283,298		28	%	Quarterly, Semi-annually	60-95 days
Event-driven funds	37,680		4	%	Annually	45 days
Direct lending funds	261,902		26	%	n/a	n/a
Private equity funds	65,811		7	%	n/a	n/a
Real estate funds	54,720		5	%	n/a	n/a
CLO-Equities	28,556		2	%	n/a	n/a
Other privately held investments	48,787		5	%	n/a	n/a
Overseas deposits	203,344		20	%	n/a	n/a
Total other investments	$	1,009,587	100	%
At December 31, 2017
Long/short equity funds	$	38,470	4	%	Annually	60 days
Multi-strategy funds	286,164		28	%	Quarterly, Semi-annually	60-95 days
Event-driven funds	39,177		4	%	Annually	45 days
Direct lending funds	250,681		25	%	n/a	n/a
Private equity funds	68,812		7	%	n/a	n/a
Real estate funds	50,009		5	%	n/a	n/a
CLO-Equities	31,413		2	%	n/a	n/a
Other privately held investments	46,430		5	%	n/a	n/a
Overseas deposits	198,217		20	%	n/a	n/a
Total other investments	$	1,009,373	100	%

n/a -notapplicable

The investment strategies for the above funds are as follows:

• Long/short equity funds: Seek to achieve attractive returns primarily by executing an equity trading strategy involving both long and short investments in publicly-traded equity securities.

• Multi-strategy funds: Seek to achieve above-market returns by pursuing multiple investment strategies to diversify risks and reduce volatility. This category includes funds of hedge funds which invest in a large pool of hedge funds across a diversified range of hedge fund strategies.

• Event-driven funds: Seek to achieve attractive returns by exploiting situations where announced or anticipated events create opportunities.

• Direct lending funds: Seek to achieve attractive risk-adjusted returns, including current income generation, by investing in funds which provide financing directly to borrowers.

• Private equity funds: Seek to achieve attractive risk-adjusted returns by investing in private transactions over the course of several years.

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3. INVESTMENTS (CONTINUED)

• Real estate funds: Seek to achieve attractive risk-adjusted returns by making and managing investments in real estate and real estate securities and businesses.

Two common redemption restrictions which may impact the Company's ability to redeem hedge funds are gates and lockups. A gate is a suspension of redemptions which may be implemented by the general partner or investment manager of the fund in order to defer, in whole or in part, the redemption request in the event the aggregate amount of redemption requests exceeds a predetermined percentage of the fund's net assets which may otherwise hinder the general partner or investment manager's ability to liquidate holdings in an orderly fashion in order to generate the cash necessary to fund extraordinarily large redemption payouts. A lockup period is the initial amount of time an investor is contractually required to hold the security before having the ability to redeem. During the three months ended March 31,2018 and 2017, neither of these restrictions impacted the Company's redemption requests. At March 31,2018, $25 million (2017: $38 million), representing 7% (2017: 11%) of total hedge funds, relate to a holding where the Company is still within the lockup period. The expiration of this lockup period is in March 2019. 

At March 31,2018, the Company had $128 million (2017: $137 million) of unfunded commitments as a limited partner in direct lending funds. Once the full amount of committed capital has been called by the General Partner of each of these funds, the assets will not be fully returned until the completion of the fund's investment term. These funds have investment terms ranging from five to ten years and the General Partners of certain funds have the option to extend the term by up to three years.

At March 31,2018, the Company had $17 million (2017: $16 million) of unfunded commitments as a limited partner in multi-strategy hedge funds. Once the full amount of committed capital has been called by the General Partner of each of these funds, the assets will not be fully returned until after the completion of the funds' investment term. These funds have investment terms ranging from two years to the dissolution of the underlying fund.

At March 31,2018, the Company had $105 million (2017: $115 million) of unfunded commitments as a limited partner in funds which invest in real estate and real estate securities and businesses. These funds have investment terms ranging from seven years to the dissolution of the underlying fund.

At March 31,2018, the Company had $18 million (2017: $21 million) of unfunded commitments as a limited partner in a private equity fund. The life of the fund is subject to the dissolution of the underlying funds. The Company expects the overall holding period to be over ten years.

During 2015, the Company made a $50 million commitment as a limited partner of a bank revolver opportunity fund. The fund has an investment term of seven years and the General Partners have the option to extend the term by up to two years. At March 31,2018, this commitment remains unfunded. It is not anticipated that the full amount of this fund will be drawn.

During 2017, the Company made a $75 million commitment as a limited partner of an open-ended commercial mortgage income fund. At March 31,2018, this commitment remains unfunded.

Syndicate 2007 holds overseas deposits which include investments in private funds where the underlying investments are primarily U.S. government, Non-U.S. government and corporate debt securities. The funds do not trade on an exchange therefore are not included within available for sale investments.

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3. INVESTMENTS (CONTINUED)

d) Equity Method Investments

During 2016, the Company paid $108 million including direct transaction costs to acquire 19% of the common equity of Harrington Reinsurance Holdings Limited ("Harrington"), the parent company of Harrington Re Ltd. ("Harrington Re"), an independent reinsurance company jointly sponsored by AXIS Capital and The Blackstone Group L.P. ("Blackstone"). Through long-term service agreements, AXIS Capital will serve as Harrington Re's reinsurance underwriting manager and Blackstone will serve as exclusive investment management service provider. As an investor, the Company expects to benefit from underwriting profit generated by Harrington Re and the income and capital appreciation Blackstone seeks to deliver through its investment management services. In addition, the Company has entered into an arrangement with Blackstone under which underwriting and investment related fees will be shared equally. Harrington is not a variable interest entity. Given that the Company exercises significant influence over the operating and financial policies of this investee, the Company accounts for the ownership in Harrington under the equity method of accounting. The Company's proportionate share of the underlying equity in net assets resulted in a basis difference of $5 million which represents initial transactions costs.

During the three months ended March 31,2017, the Company recorded an impairment charge of $6 million, related to a U.S. based insurance company, which reduced the carrying value of the investment from $9 million to $3 million. During the three months ended June 30, 2017, the carrying value of the investment was reduced to $nil. These charges were included in interest in income (loss) of equity method investments in the Consolidated Statement of Operations.

e) Net Investment Income

Net investment income was derived from the following sources:

	Three months ended March 31,
	2018			2017
Fixed maturities	$	83,958		$	77,407
Other investments	13,704			18,962
Equity securities	1,758			3,478
Mortgage loans	3,125			2,477
Cash and cash equivalents	4,153			3,095
Short-term investments	875			438
Gross investment income	107,573			105,857
Investment expenses	(6,574		)	(7,193		)
Net investment income	$	100,999		$	98,664

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

3. INVESTMENTS (CONTINUED)

f) Net Investment Losses

The following table provides an analysis of net investment losses:

	Three months ended March 31,
	2018			2017
Gross realized investment gains
Fixed maturities and short-term investments	$	31,628		$	20,777
Equity securities	17,557			15,783
Gross realized investment gains	49,185			36,560
Gross realized investment losses
Fixed maturities and short-term investments	(43,535		)	(52,935		)
Equity securities	(1,276		)	(189		)
Gross realized investment losses	(44,811		)	(53,124		)
Net OTTI recognized in net income	(414		)	(6,553		)
Change in fair value of investment derivatives(1)	2,023			(1,933		)
Net unrealized gains (losses) on equity securities(2)	(20,813		)	—
Net investment losses	$	(14,830	)	$	(25,050	)

(1) Refer to Note 5 'Derivative Instruments'.

(2) Effective January 1, 2018, the Company adopted ASU No. 2016-01.  The change in fair value of equity securities is now recognized in net investment losses.

The following table summarizes the OTTI recognized in net income by asset class:

	Three months ended March 31,
	2018		2017
Fixed maturities:
Non-U.S. government	$	—	$	4,282
Corporate debt	414		2,271
Total OTTI recognized in net income	$	414	$	6,553

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

3. INVESTMENTS (CONTINUED)

The following table provides a roll forward of the credit losses ("credit loss table"), before income taxes, for which a portion of the OTTI was recognized in AOCI:

	Three months ended March 31,
	2018			2017
Balance at beginning of period	$	1,494		$	1,493
Credit impairments recognized on securities not previously impaired	—			—
Additional credit impairments recognized on securities previously impaired	—			—
Change in timing of future cash flows on securities previously impaired	—			—
Intent to sell of securities previously impaired	—			—
Securities sold/redeemed/matured	(10		)	(10		)
Balance at end of period	$	1,484		$	1,483

g) Reverse Repurchase Agreements

At March 31,2018, the Company held $24 million (2017: $37 million) of reverse repurchase agreements. These loans are fully collateralized, are generally outstanding for a short period of time and are presented on a gross basis as part of cash and cash equivalents in the Company's Consolidated Balance Sheets. The required collateral for these loans is either cash or U.S. Treasuries at a minimum rate of 102% of the loan principal. Upon maturity, the Company receives principal and interest income. The Company monitors the estimated fair value of the securities loaned and borrowed on a daily basis with additional collateral obtained as necessary throughout the duration of the transaction.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS

Fair Value Hierarchy

Fair value is defined as the price to sell an asset or transfer a liability (i.e. the "exit price") in an orderly transaction between market participants. U.S. GAAP prescribes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data. The level in the hierarchy within which a given fair value measurement falls is determined based on the lowest level input that is significant to the measurement. The hierarchy is broken down into three levels as follows:

• Level 1 - Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access.

• Level 2 - Valuations based on quoted prices in active markets for similar assets or liabilities, quoted prices for identical assets or liabilities in inactive markets, or for which significant inputs are observable (e.g. interest rates, yield curves, prepayment speeds, default rates, loss severities, etc.) or can be corroborated by observable market data.

• Level 3 - Valuations based on inputs that are unobservable and significant to the overall fair value measurement. The unobservable inputs reflect the Company's own judgments about assumptions that market participants might use.

The availability of observable inputs can vary from financial instrument to financial instrument and is affected by a wide variety of factors including, for example, the type of financial instrument, whether the financial instrument is new and not yet established in the marketplace, and other characteristics particular to the transaction. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires significantly more judgment.

Accordingly, the degree of judgment exercised by management in determining fair value is greatest for instruments categorized in Level 3. In periods of market dislocation, the observability of prices and inputs may be reduced for many instruments. This may lead the Company to change the selection of valuation technique (from market to cash flow approach) or may cause the Company to use multiple valuation techniques to estimate the fair value of a financial instrument. This circumstance could cause an instrument to be reclassified between levels within the fair value hierarchy.

Valuation Techniques

The valuation techniques, including significant inputs and assumptions generally used to determine the fair values of the Company's financial instruments as well as the classification of the fair values of its financial instruments in the fair value hierarchy are described in detail below.

Fixed Maturities

At each valuation date, the Company uses the market approach valuation technique to estimate the fair value of its fixed maturities portfolio, when possible. This market approach includes, but is not limited to, prices obtained from third party pricing services for identical or comparable securities and the use of "pricing matrix models" using observable market inputs such as yield curves, credit risks and spreads, measures of volatility, and prepayment speeds. Pricing from third party pricing services is sourced from multiple vendors, when available, and the Company maintains a vendor hierarchy by asset type based on historical pricing experience and vendor expertise. When prices are unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers who are active in the corresponding markets. The valuation techniques including significant inputs generally used to determine the fair values of the Company's fixed maturities by asset class as well as the classifications of the fair values of these securities in the fair value hierarchy are described in detail below.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS (CONTINUED)

U.S. government and agency

U.S. government and agency securities consist primarily of bonds issued by the U.S. Treasury and mortgage pass-through agencies such as the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation and the Government National Mortgage Association. As the fair values of U.S. Treasury securities are based on unadjusted market prices in active markets, these securities are classified as Level 1. The fair values of U.S. government agency securities are determined using the spread above the risk-free yield curve. As the yields for the risk-free yield curve and the spreads are observable market inputs, the fair values of U.S. government agency securities are classified as Level 2.

Non-U.S. government

Non-U.S. government securities include bonds issued by non-U.S. governments and their agencies along with supranational organizations (collectively also known as sovereign debt securities). The fair values of these securities are based on prices obtained from international indices or valuation models that include inputs such as interest rate yield curves, cross-currency basis index spreads, and country credit spreads for structures similar to the sovereign bond in terms of issuer, maturity and seniority. As the significant inputs used to price these securities are observable market inputs, the fair values of non-U.S. government securities are classified as Level 2.

Corporate debt

Corporate debt securities consist primarily of investment-grade debt of a wide variety of corporate issuers and industries. The fair values of these securities are generally determined using the spread above the risk-free yield curve. These spreads are generally obtained from the new issue market, secondary trading and broker-dealer quotes. As the yields for the risk-free yield curve and the spreads are observable market inputs, the fair values of corporate debt securities are classified as Level 2. Where pricing is unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers to estimate fair value. This is generally the case when there is a low volume of trading activity and current transactions are not orderly. In this event, the fair values of these securities are classified as Level 3.

Agency RMBS

Agency RMBS consist of bonds issued by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation and the Government National Mortgage Association. The fair values of these securities are priced using a mortgage pool specific model which uses daily inputs from the active to be announced market and the spread associated with each mortgage pool based on vintage. As the significant inputs used to price these securities are observable market inputs, the fair values of Agency RMBS are classified as Level 2.

CMBS

CMBS include mostly investment-grade bonds originated by non-agencies. The fair values of these securities are determined using a pricing model which uses dealer quotes and other available trade information along with security level characteristics to determine deal specific spreads. As the significant inputs used to price these securities are observable market inputs, the fair values of CMBS securities are classified as Level 2. Where pricing is unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers to estimate fair value. This is generally the case when there is a low volume of trading activity and current transactions are not orderly. In this event, the fair values of these securities are classified as Level 3.

Non-Agency RMBS

Non-Agency RMBS include mostly investment-grade bonds originated by non-agencies. The fair values of these securities are determined using an option adjusted spread model or other relevant models, which use inputs including available trade information or broker quotes, prepayment and default projections based on historical statistics of the underlying collateral and current market data. As the significant inputs used to price these securities are observable market inputs, the fair values of Non-Agency RMBS are classified as Level 2.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS (CONTINUED)

ABS

ABS include mostly investment-grade bonds backed by pools of loans with a variety of underlying collateral, including auto loans, student loans, credit card receivables, CDOs and CLO debt originated by a variety of financial institutions. The fair values of these securities are determined using a model which uses prepayment speeds and spreads sourced primarily from the new issue market. As the significant inputs used to price these securities are observable market inputs, the fair values of ABS are classified as Level 2. Where pricing is unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers to estimate fair value. This is generally the case when there is a low volume of trading activity and current transactions are not orderly. In this event, the fair values of these securities are classified as Level 3.

Municipals

Municipals comprise revenue and general obligation bonds issued by U.S. domiciled state and municipal entities. The fair values of these securities are determined using spreads obtained from the new issue market, trade prices and broker-dealers quotes. As the significant inputs used to price these securities are observable market inputs, the fair values of municipals are classified as Level 2.

Equity Securities

Equity securities include common stocks, exchange-traded funds and bond mutual funds. As the fair values of common stocks and exchange-traded funds are based on unadjusted quoted market prices in active markets, these securities are classified as Level 1.

As bond mutual funds have daily liquidity with redemptions based on the Net Asset Values per share ("NAV") of the funds, the fair values of these securities are classified as Level 2.

Other Investments

Other privately held securities include convertible preferred shares, convertible notes and notes payable. These securities are initially valued at cost which approximates fair value. In subsequent measurement periods, the fair values of these securities are determined using an income approach valuation technique, specifically an internally developed discounted cash flow model. As the significant inputs used to price these securities are unobservable, the fair value of these securities are classified as Level 3.

Indirect investments in CLO-Equities are classified as Level 3 as the fair values of these securities are estimated using an income approach valuation technique, specifically an externally developed discounted cash flow model due to the lack of observable and relevant trades in secondary markets. Direct investments in CLO-Equities are also classified as Level 3 as the fair values of these securities are estimated using a liquidation valuation.

Overseas deposits include investments in private funds held by Syndicate 2007 where the underlying investments are primarily U.S. government, Non-U.S. government and corporate debt securities. The funds do not trade on an exchange therefore are not included within available for sale investments. As the significant inputs used to price the underlying investments are observable market inputs, the fair values of overseas deposits are classified as Level 2.

Short-Term Investments

Short-term investments primarily comprise highly liquid securities with maturities greater than three months but less than one year from the date of purchase. These securities are classified as Level 2 because these securities are typically not actively traded due to their approaching maturity and, as such, their amortized cost approximates fair value.

Derivative Instruments

Derivative instruments include foreign currency forward contracts, exchange traded interest rate swaps and commodity contracts that are customized to the Company's economic hedging strategies and trade in the over-the-counter derivative market. The fair values of these derivatives are determined using a market approach valuation technique based on significant observable market inputs from third party pricing vendors, non-binding broker-dealer quotes and/or recent trading activity. As the significant inputs used to price these securities are observable market inputs,, the fair values of these derivatives are classified as Level 2.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS (CONTINUED)

Other underwriting-related derivatives include insurance and reinsurance contracts that are accounted for as derivatives. These derivative contracts are initially valued at cost which approximates fair value. In subsequent measurement periods, the fair values of these derivatives are determined using an income approach valuation technique, specifically internally developed discounted cash flow models. As the significant inputs used to price these derivatives are unobservable, the fair values of these contracts are classified as Level 3.

Insurance-linked Securities

Insurance-linked securities comprise an investment in a catastrophe bond. As pricing is unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers to estimate the fair value of this security. Pricing is generally unavailable when there is a low volume of trading activity and current transactions are not orderly therefore the fair value of this security is classified as Level 3.

Cash Settled Awards

Cash settled awards comprise restricted stock units that form part of the Company's compensation program. Although the fair values of these awards are determined using observable quoted market prices in active markets, the restricted stock units are not actively traded. As the significant inputs used to price these securities are observable market inputs, the fair values of these liabilities are classified as Level 2.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS (CONTINUED)

The tables below present the financial instruments measured at fair value on a recurring basis for the periods indicated:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair value based on NAV practical expedient		Total Fair Value
At March 31, 2018
Assets
Fixed maturities
U.S. government and agency	$	1,769,810	$	27,155	$	—	$	—	$	1,796,965
Non-U.S. government	—		661,224		—		—		661,224
Corporate debt	—		4,596,960		43,471		—		4,640,431
Agency RMBS	—		1,914,845		—		—		1,914,845
CMBS	—		1,030,621		—		—		1,030,621
Non-Agency RMBS	—		41,397		—		—		41,397
ABS	—		1,566,698		—		—		1,566,698
Municipals	—		149,215		—		—		149,215
	1,769,810		9,988,115		43,471		—		11,801,396
Equity securities
Common stocks	23,942		—		—		—		23,942
Exchange-traded funds	262,630		—		—		—		262,630
Bond mutual funds	—		149,170		—		—		149,170
	286,572		149,170		—		—		435,742
Other investments
Hedge funds (1)	—		—		—		346,467		346,467
Direct lending funds	—		—		—		261,902		261,902
Private equity funds	—		—		—		65,811		65,811
Real estate funds	—		—		—		54,720		54,720
Other privately held investments	—		—		48,787		—		48,787
CLO-Equities	—		—		28,556		—		28,556
Overseas deposits	—		203,344		—		—		203,344
	—		203,344		77,343		728,900		1,009,587
Short-term investments	—		56,246		—		—		56,246
Other assets
Derivative instruments (see Note 5)	—		5,283		—		—		5,283
Insurance-linked securities	—		—		25,000		—		25,000
Total Assets	$	2,056,382	$	10,402,158	$	145,814	$	728,900	$	13,333,254
Liabilities
Derivative instruments (see Note 5)	$	—	$	3,439	$	10,942	$	—	$	14,381
Cash settled awards (see Note 8)	—		8,789		—		—		8,789
Total Liabilities	$	—	$	12,228	$	10,942	$	—	$	23,170

(1) Includes Long/short equity, Multi-strategy and Event-driven funds.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS (CONTINUED)

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair value based on NAV practical expedient		Total Fair Value
At December 31, 2017
Assets
Fixed maturities
U.S. government and agency	$	1,658,622	$	53,847	$	—	$	—	$	1,712,469
Non-U.S. government	—		806,299		—		—		806,299
Corporate debt	—		5,244,969		52,897		—		5,297,866
Agency RMBS	—		2,395,152		—		—		2,395,152
CMBS	—		777,728		—		—		777,728
Non-Agency RMBS	—		46,831		—		—		46,831
ABS	—		1,436,281		—		—		1,436,281
Municipals	—		149,380		—		—		149,380
	1,658,622		10,910,487		52,897		—		12,622,006
Equity securities
Common stocks	25,658		—		—		—		25,658
Exchange-traded funds	427,633		—		—		—		427,633
Bond mutual funds	—		182,220		—		—		182,220
	453,291		182,220		—		—		635,511
Other investments
Hedge funds (1)	—		—		—		363,811		363,811
Direct lending funds	—		—		—		250,681		250,681
Private equity funds	—		—		—		68,812		68,812
Real estate funds	—		—		—		50,009		50,009
Other privately held investments	—		—		46,430		—		46,430
CLO-Equities	—		—		31,413		—		31,413
Overseas deposits	—		198,217		—		—		198,217
	—		198,217		77,843		733,313		1,009,373
Short-term investments	—		83,661		—		—		83,661
Other assets
Derivative instruments (see Note 5)	—		5,125		—		—		5,125
Insurance-linked securities	—		—		25,090		—		25,090
Total Assets	$	2,111,913	$	11,379,710	$	155,830	$	733,313	$	14,380,766
Liabilities
Derivative instruments (see Note 5)	$	—	$	2,876	$	11,510	$	—	$	14,386
Cash settled awards (see Note 8)	—		21,535		—		—		21,535
Total Liabilities	$	—	$	24,411	$	11,510	$	—	$	35,921

(1) Includes Long/short equity, Multi-strategy and Event-driven funds.

During 2018 and 2017, the Company had no transfers between Levels 1 and 2.

Except certain fixed maturities and insurance-linked securities priced using broker-dealer quotes (underlying inputs are not available), the following table quantifies the significant unobservable inputs used in estimating fair values at March 31,2018 for investments classified as Level 3 in the fair value hierarchy.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS (CONTINUED)

	Fair Value			Valuation Technique	Unobservable Input	Range	Weighted Average
Other investments - CLO-Equities	$	27,118		Discounted cash flow	Default rates	3.0%	3.0%
					Loss severity rate	35.0%	35.0%
					Collateral spreads	3.0%	3.0%
					Estimated maturity dates	7 years	7 years
	$	1,438		Liquidation value	Fair value of collateral	100%	100%
					Discount margin	0.1% - 12.0%	2.1%
Other investments - Other privately held investments	$	48,787		Discounted cash flow	Discount rate	3.0% - 8.5%	7.2%
Derivatives - Other underwriting-related derivatives	$	(10,942	)	Discounted cash flow	Discount rate	2.7%	2.7%

The CLO-Equities market continues to be relatively inactive with only a small number of transactions being observed, particularly as it relates to transactions involving CLO-Equities held by the Company. Accordingly, fair values of investments in CLO-Equities are determined using models. Given that all of the Company's direct investments in CLO-Equities are past their reinvestment period, there is uncertainty regarding the remaining time until maturity. As such the Company's direct investments in CLO-Equities are estimated using a liquidation valuation. Indirect investments in CLO-Equities are valued using a discounted cash flow model prepared by an external investment manager.

The liquidation valuation is based on the fair values of the net underlying collateral which is determined by applying market discount margins by credit quality bucket. An increase (decrease) in the market discount margin would result in a decrease (increase) in value of the Company's CLO-Equities.

Regarding the discounted cash flow model, the default and loss severity rates are the most judgmental unobservable market inputs to which the valuation of CLO-Equities is most sensitive. A significant increase (decrease) in either of these significant inputs in isolation would result in lower (higher) fair value estimates for investments in CLO-Equities and, in general, a change in default rate assumptions would be accompanied by a directionally similar change in loss severity rate assumptions. Collateral spreads and estimated maturity dates are less judgmental inputs as they are based on the historical average of actual spreads and the weighted average life of the current underlying portfolios, respectively. A significant increase (decrease) in either of these significant inputs in isolation would result in higher (lower) fair value estimates for investments in CLO-Equities. In general, these inputs have no significant interrelationship with each other or with default and loss severity rates.

On a quarterly basis, the Company's valuation process for CLO-Equities includes a review of the underlying collateral along with related discount margins by credit quality bucket used in the liquidation valuation and a review of the underlying cash flows and key assumptions used in the discounted cash flow model. The above significant unobservable inputs are reviewed and updated based on information obtained from secondary markets, including information received from the managers of the Company's CLO-Equities portfolio. In order to assess the reasonableness of the inputs the Company uses in its models, the Company maintains an understanding of current market conditions, historical results, as well as emerging trends that may impact future cash flows. In addition, the assumptions the Company uses in its models are updated through regular communication with industry participants and ongoing monitoring of the deals in which the Company participates (e.g. default and loss severity rate trends).

Other privately held securities are initially valued at cost which approximates fair value. In subsequent measurement periods, the fair values of these securities are determined using internally developed discounted cash flow models. These models include inputs that are specific to each investment. The inputs used in the fair value measurements include dividend or interest rates and appropriate discount rates. The selection of an appropriate discount rate is judgmental and is the most significant unobservable input used in the valuation of these securities. A significant increase (decrease) in this input in isolation could result in significantly lower (higher) fair value measurement for other privately held securities. Where relevant, the Company also considers the contractual agreements which stipulate methodologies for calculating the dividend rate to be paid upon liquidation, conversion or redemption. In order to assess the

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS (CONTINUED)

reasonableness of the inputs that are used in the discounted cash flow models, the Company maintains an understanding of current market conditions, historical results, as well as investee specific information that may impact future cash flows.

Other underwriting-related derivatives are initially valued at cost which approximates fair value. In subsequent measurement periods, the fair values of these derivatives are determined using internally developed discounted cash flow models which uses appropriate discount rates. The selection of an appropriate discount rate is judgmental and is the most significant unobservable input used in the valuation of these derivatives. A significant increase (decrease) in this input in isolation could result in a significantly lower (higher) fair value measurement for the derivative contracts. In order to assess the reasonableness of the inputs the Company uses in the discounted cash flow model, the Company maintains an understanding of current market conditions, historical results, as well as contract specific information that may impact future cash flows.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS (CONTINUED)

The following tables present changes in Level 3 for financial instruments measured at fair value on a recurring basis for the periods indicated:

	Opening Balance		Transfers into Level 3		Transfers out of Level 3			Included in net income(1)			Included in OCI (2)		Purchases		Sales			Settlements/ Distributions			Closing Balance		Change in unrealized investment gains/(losses) (3)
Three months ended March 31, 2018
Fixed maturities
Corporate debt	$	52,897	$	—	$	(4,279	)	$	(118	)	$	1,403	$	—	$	(2,536	)	$	(3,896	)	$	43,471	$	—
CMBS	—		—		—			—			—		—		—			—			—		—
ABS	—		—		—			—			—		—		—			—			—		—
	52,897		—		(4,279		)	(118		)	1,403		—		(2,536		)	(3,896		)	43,471		—
Other investments
Other privately held investments	46,430		—		—			746			—		3,111		(1,500		)	—			48,787		746
CLO - Equities	31,413		—		—			1,616			—		—		—			(4,473		)	28,556		1,616
	77,843		—		—			2,362			—		3,111		(1,500		)	(4,473		)	77,343		2,362
Other assets
Derivative instruments	—		—		—			—			—		—		—			—			—		—
Insurance-linked securities	25,090		—		—			(90		)	—		—		—			—			25,000		(90		)
	25,090		—		—			(90		)	—		—		—			—			25,000		(90		)
Total assets	$	155,830	$	—	$	(4,279	)	$	2,154		$	1,403	$	3,111	$	(4,036	)	$	(8,369	)	$	145,814	$	2,272
Other liabilities
Derivative instruments	$	11,510	$	—	$	—		$	(568	)	$	—	$	—	$	—		$	—		$	10,942	$	(568	)
Total liabilities	$	11,510	$	—	$	—		$	(568	)	$	—	$	—	$	—		$	—		$	10,942	$	(568	)

	Opening Balance		Transfers into Level 3		Transfers out of Level 3			Included in net income(1)		Included in OCI (2)			Purchases		Sales			Settlements/ Distributions			Closing Balance		Change in unrealized investment gains/(losses) (3)
Three months ended March 31, 2017
Fixed maturities
Corporate debt	$	75,875	$	—	$	—		$	58	$	(47	)	$	5,964	$	(15,720	)	$	(2,342	)	$	63,788	$	—
CMBS	3,061		—		—			—		(3		)	9,400		—			(2,645		)	9,813		—
ABS	17,464		—		(18,948		)	—		1,484			—		—			—			—		—
	96,400		—		(18,948		)	58		1,434			15,364		(15,720		)	(4,987		)	73,601		—
Other investments
Other privately held investments	42,142		—		—			236		—			—		—			—			42,378		236
CLO - Equities	60,700		—		—			1,029		—			—		—			(7,337		)	54,392		1,029
	102,842		—		—			1,265		—			—		—			(7,337		)	96,770		1,265
Other assets
Derivative instruments	2,532		—		—			755		—			—		—			(90		)	3,197		755
Insurance-linked securities	25,023		—		—			3		—			—		—			—			25,026		3
	27,555		—		—			758		—			—		—			(90		)	28,223		758
Total assets	$	226,797	$	—	$	(18,948	)	$	2,081	$	1,434		$	15,364	$	(15,720	)	$	(12,414	)	$	198,594	$	2,023
Other liabilities
Derivative instruments	$	6,500	$	—	$	—		$	8,686	$	—		$	—	$	—		$	1,435		$	16,621	$	7,335
Total liabilities	$	6,500	$	—	$	—		$	8,686	$	—		$	—	$	—		$	1,435		$	16,621	$	7,335

(1) Realized gains (losses) on fixed maturities, and realized and unrealized gains (losses) on other assets and other liabilities included in net income are included in net investment gains (losses). Realized and unrealized gains and (losses) on other investments included in net income are included in net investment income.

(2) Unrealized gains (losses) on fixed maturities are included in other comprehensive income ("OCI").

(3) Change in unrealized investment gain (loss) relating to assets held at the reporting date.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS (CONTINUED)

The transfers into and out of fair value hierarchy levels reflect the fair value of the securities at the end of the reporting period.

Transfers into Level 3 from Level 2

There were no transfers to Level 3 from Level 2 made during the three months ended March 31, 2018 and 2017.

Transfers out of Level 3 into Level 2

The transfers into Level 2 from Level 3 made during the three months ended March 31, 2018 and 2017 were primarily due to the availability of observable market inputs and quotes from pricing vendors on certain fixed maturities.

Measuring the Fair Value of Other Investments Using Net Asset Valuations

The fair values of hedge funds, direct lending funds, private equity funds and real estate funds are estimated using NAVs as advised by external fund managers or third party administrators. For these funds, NAVs are based on the manager's or administrator's valuation of the underlying holdings in accordance with the fund's governing documents and in accordance with U.S. GAAP.

If there is a reporting lag between the current period end and reporting date of the latest available fund valuation for any hedge fund, the Company estimates fair values by starting with the most recently available fund valuation and adjusting for return estimates as well as any subscriptions, redemptions and distributions that took place during the current period. Return estimates are obtained from the relevant fund managers. Accordingly, the Company does not typically have a reporting lag in fair value measurements of these funds. Historically, the Company's valuation estimates incorporating these return estimates have not significantly diverged from the subsequently received NAVs.

For direct lending funds, private equity funds, real estate funds and two of the Company's hedge funds, valuation statements are typically released on a three month reporting lag therefore the Company estimates the fair value of these funds by starting with the prior quarter-end fund valuations and adjusting for capital calls, redemptions, drawdowns and distributions. Return estimates are not available from the relevant fund managers for these funds therefore the Company typically has a reporting lag in its fair value measurements of these funds. For the three months ended March 31,2018, funds reported on a lag represented 44% (2017: 44%) of the Company's total other investments balance.

The Company often does not have access to financial information relating to the underlying securities held within the funds, therefore management is unable to corroborate the fair values placed on the securities underlying the asset valuations provided by fund managers or fund administrators. In order to assess the reasonableness of the NAVs, the Company performs a number of monitoring procedures on a quarterly basis, to assess the quality of the information provided by fund managers and funds administrators. These procedures include, but are not limited to, regular review and discussion of each fund's performance with its manager, regular evaluation of fund performance against applicable benchmarks and the backtesting of the Company's fair value estimates against subsequently received NAVs. Backtesting involves comparing the Company's previously reported fair values for each fund against NAVs per audited financial statements (for year-end values) and final NAVs from fund managers and fund administrators (for interim values).

The fair values of hedge funds, direct lending funds, private equity funds and real estate funds are measured using the NAV practical expedient, therefore the fair values of these funds have not been categorized within the fair value hierarchy.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4. FAIR VALUE MEASUREMENTS (CONTINUED)

Financial Instruments Disclosed, But Not Carried, at Fair Value

The fair value of financial instruments accounting guidance also applies to financial instruments disclosed, but not carried, at fair value, except for certain financial instruments, including insurance contracts.

At March 31,2018, the carrying values of cash and cash equivalents including restricted amounts, accrued investment income, receivable for investments sold, certain other assets, payable for investments purchased and certain other liabilities approximated their fair values due to their respective short maturities. As these financial instruments are not actively traded, their fair values are classified as Level 2.

At March 31,2018, the carrying value of mortgage loans held-for-investment approximated their fair value. The fair values of mortgage loans are primarily determined by estimating expected future cash flows and discounting them using current interest rates for similar mortgage loans with similar credit risk, or are determined from pricing for similar loans. As mortgage loans are not actively traded their fair values are classified as Level 3.

At March 31,2018, senior notes are recorded at amortized cost with a carrying value of $1,377 million (2017: $1,341 million) and a fair value of $1,366 million (2017: $1,412 million). The fair values of these senior notes are based on prices obtained from a third party pricing service and are determined using the spread above the risk-free yield curve. These spreads are generally obtained from the new issue market, secondary trading and broker-dealer quotes. As these spreads and the yields for the risk-free yield curve are observable market inputs, the fair values of senior notes are classified as Level 2.

At March 31,2018, notes payable are recorded at amortized cost with a carrying value of $36 million and a fair value of $36 million. The fair values of the notes payable are primarily determined by estimating expected future cash flows and discounting them using current interest rates for notes payable with similar credit risk. As notes payables are not actively traded their fair values are classified as Level 3.

5. DERIVATIVE INSTRUMENTS

The balance sheet classifications of derivatives recorded at fair value are shown in the following table. The notional amount of derivative contracts represents the basis upon which pay or receive amounts are calculated and are presented in the table to quantify the volume of the Company's derivative activities. Notional amounts are not reflective of credit risk.

None of the Company's derivative instruments are designated as hedges under current accounting guidance.

	March 31, 2018						December 31, 2017
	Derivative Notional Amount		Derivative Asset Fair Value(1)		Derivative Liability Fair Value(1)		Derivative Notional Amount		Derivative Asset Fair Value(1)		Derivative Liability Fair Value(1)
Relating to investment portfolio:
Foreign exchange forward contracts	$	120,762	$	146	$	161	$	137,422	$	10	$	619
Interest rate swaps	166,000		—		1,379		191,000		448		1,556
Relating to underwriting portfolio:
Foreign exchange forward contracts	649,919		5,137		1,899		698,959		4,667		701
Weather-related contracts	—		—		—		—		—		—
Other underwriting-related contracts	85,000		—		10,942		85,000		—		11,510
Total derivatives			$	5,283	$	14,381			$	5,125	$	14,386

(1) Asset and liability derivatives are classified within other assets and other liabilities in the Consolidated Balance Sheets.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

5. DERIVATIVE INSTRUMENTS (CONTINUED)

Offsetting Assets and Liabilities

The Company's derivative instruments are generally traded under International Swaps and Derivatives Association master netting agreements, which establish terms that apply to all transactions. In the event of a bankruptcy or other stipulated event, master netting agreements provide that individual positions be replaced with a new amount, usually referred to as the termination amount, determined by taking into account market prices and converting into a single currency. Effectively, this contractual close-out netting reduces credit exposure from gross to net exposure. A reconciliation of gross derivative assets and liabilities to the net amounts presented in the Consolidated Balance Sheets, with the difference being attributable to the impact of master netting agreements, is shown in the following table.

	March 31, 2018							December 31, 2017
	Gross Amounts		Gross Amounts Offset			Net Amounts(1)		Gross Amounts		Gross Amounts Offset			Net Amounts(1)
Derivative assets	$	6,703	$	(1,420	)	$	5,283	$	8,178	$	(3,053	)	$	5,125
Derivative liabilities	$	15,801	$	(1,420	)	$	14,381	$	17,439	$	(3,053	)	$	14,386

(1) Net asset and liability derivatives are classified within other assets and other liabilities in the Consolidated Balance Sheets.

For information on reverse repurchase agreements see Note 3 'Investments'.

a) Relating to Investment Portfolio

Foreign Currency Risk

The Company's investment portfolio is exposed to foreign currency risk therefore the fair values of its investments are partially influenced by the change in foreign exchange rates. The Company may enter into foreign currency forward contracts to manage the effect of this foreign currency risk. These foreign currency hedging activities are not designated as specific hedges for financial reporting purposes.

Interest Rate Risk

The Company's investment portfolio contains a large percentage of fixed maturities which expose it to significant interest rate risk. As part of overall management of this risk, the Company may use interest rate swaps.

b) Relating to Underwriting Portfolio

Foreign Currency Risk

The Company's (re)insurance subsidiaries and branches operate in various countries. Some of its business is written in currencies other than the U.S. dollar, therefore the underwriting portfolio is exposed to significant foreign currency risk. The Company manages foreign currency risk by seeking to match its foreign-denominated net liabilities under (re)insurance contracts with cash and investments that are denominated in the same currencies. The Company may also use derivative instruments, specifically forward contracts and currency options, to economically hedge foreign currency exposures.

Weather Risk

During 2013, the Company began to write derivative-based risk management products designed to address weather risks with the objective of generating profits on a portfolio basis. The majority of this business consists of receiving a payment at contract inception in exchange for bearing the risk of variations in a quantifiable weather-related phenomenon, such as temperature. Where a client wishes to minimize the upfront payment, these transactions may be structured as swaps or collars. In general, the Company's portfolio of such derivative contracts is of short duration, with contracts being predominantly seasonal in nature. In order to economically hedge a portion of this portfolio, the Company may also purchase weather derivatives. Effective July 1, 2017, the Company no longer writes derivative-based risk management products which address weather risks.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

5. DERIVATIVE INSTRUMENTS (CONTINUED)

Other Underwriting-related Risks

The Company enters into insurance and reinsurance contracts that are accounted for as derivatives. These insurance or reinsurance contracts provide indemnification to an insured or cedant as a result of a change in a variable as opposed to an identifiable insurable event. The Company considers these contracts to be part of its underwriting operations.

The total unrealized and realized gains (losses) recognized in net income for derivatives not designated as hedges are shown in the following table:

	Location of Gain (Loss) Recognized in Income on Derivative	Three months ended March 31,
		2018			2017
Relating to investment portfolio:
Foreign exchange forward contracts	Net investment gains (losses)	$	(1,191	)	$	(2,372	)
Interest rate swaps	Net investment gains (losses)	3,214			439
Relating to underwriting portfolio:
Foreign exchange forward contracts	Foreign exchange losses (gains)	7,768			(2,758		)
Weather-related contracts	Other insurance related income (losses)	—			(7,932		)
Other underwriting-related contracts	Other insurance related income (losses)	901			—
Total		$	10,692		$	(12,623	)

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

6.    RESERVE FOR LOSSES AND LOSS EXPENSES

Reserve Roll-Forward

The following table presents a reconciliation of the Company's beginning and ending gross reserve for losses and loss expenses and net reserve for unpaid losses and loss expenses for the periods indicated:

	Three months ended March 31,
	2018			2017
Gross reserve for losses and loss expenses, beginning of period	$	12,997,553		$	9,697,827
Less reinsurance recoverable on unpaid losses, beginning of period	(3,159,514		)	(2,276,109		)
Net reserve for unpaid losses and loss expenses, beginning of period	9,838,039			7,421,718
Net incurred losses and loss expenses related to:
Current year	715,652			631,735
Prior years	(54,307		)	(24,793		)
	661,345			606,942
Net paid losses and loss expenses related to:
Current year	(48,814		)	(31,047		)
Prior years	(675,393		)	(521,478		)
	(724,207		)	(552,525		)
Foreign exchange and other	(726,781		)	36,797
Net reserve for unpaid losses and loss expenses, end of period	9,048,396			7,512,932
Reinsurance recoverable on unpaid losses, end of period	2,986,247			2,029,031
Gross reserve for losses and loss expenses, end of period	$	12,034,643		$	9,541,963

The Company writes business with loss experience generally characterized as low frequency and high severity in nature, which can result in volatility in its financial results. During the three months endedMarch 31, 2018, the Company recognized aggregate net losses and loss expenses of $35 million (2017: $35 million) attributable to catastrophe and weather-related events.

On January 1, 2018, AXIS Managing Agency Limited, the managing agent of Syndicate 2007 entered into an agreement for the RITC of the 2015 and prior years of account of Syndicate 2007. Under the terms of this agreement, the Company ceded $819 million of reserves for losses and loss expenses, which were included in Syndicate 2007's balance sheet at December 31, 2017, to a reinsurer. This agreement was accounted for as a novation reinsurance contract. During the three months ended March 31, 2018, the Company recognized a reduction in reserves for losses and loss expenses of $819 million representing the transfer of liabilities to the reinsurer, a reduction in investments and cash of $688 million representing the consideration paid to the reinsurer and a payable of $131 million representing the consideration due to the reinsurer.

The transfer of the insurance business of AXIS Specialty Australia to a reinsurer was approved by the Irish High Court on February 1, 2017 and the Federal Court of Australia on February 10, 2017. Consequently, the insurance policies, assets and liabilities of AXIS Specialty Australia were transferred to the reinsurer with effect from February 13, 2017. This resulted in the reduction of reserves for losses and loss expenses by $223 million and a reduction in reinsurance recoverables on unpaid and paid losses by $223 million.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

6. RESERVE FOR LOSSES AND LOSS EXPENSES (CONTINUED)

Prior Year Development

Prior year reserve development arises from changes to loss and loss expense estimates related to loss events that occurred in previous calendar years. Such development is summarized by segment in the following table:

	Three months ended March 31,
	2018		2017
Insurance	$	22,775	$	7,865
Reinsurance	31,532		16,928
Total	$	54,307	$	24,793

The following tables reconcile reserve classes to the lines of business categories and the expected claim tails:

Insurance Segment
		Reported Lines of Business
Reserve Classes	Tail	Property	Marine	Terrorism	Aviation	Credit and Political Risk	Professional Lines	Liability	Accident and Health	Discontinued lines - Novae
Property and Other	Short	X		X					X	X
Marine	Short		X
Aviation	Short				X
Credit and Political Risk	Medium					X
Professional Lines	Medium						X			X
Liability	Long							X		X

Reinsurance Segment

Reported Lines of Business

Reserve Classes

Tail

Catastrophe

Property

Credit and Surety

Professional Lines

Motor

Liability

Engineering

Agriculture

Marine and Other

Accident and Health

Discontinued lines - Novae

Property and Other

Short

X

X

X

X

X

X

X

Credit and Surety

Medium

X

Professional Lines

Medium

X

Motor

Long

X

X

Liability

Long

X

X

Net favorable prior year reserve development for the three months endedMarch 31, 2018 included significant contributions from short and medium tail reserve classes. Net favorable prior year reserve development for the three months endedMarch 31, 2017 included significant contributions from medium and long tail reserve classes.

Short-tail business

Short-tail business includes the underlying exposures in property and other, marine and aviation reserve classes within the insurance segment, and the property and other reserve class within the reinsurance segment.

For the three months endedMarch 31, 2018, these reserve classes contributed $38 million (2017: $4 million) of net favorable prior year reserve development, primarily due to the recognition of better than expected loss emergence.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

6. RESERVE FOR LOSSES AND LOSS EXPENSES (CONTINUED)

Medium-tail business

Medium-tail business consists primarily of insurance and reinsurance professional reserve classes, credit and political risk insurance reserve class and credit and surety reinsurance reserve class.

For the three months endedMarch 31, 2018, the reinsurance professional reserve class recognized $9 million (2017: $16 million) of net favorable prior year development. The net favorable prior year loss development on this reserve class continued to reflect the generally favorable experience on earlier accident years as the Company continued to transition to more experienced based methods.

For the three months endedMarch 31, 2018, the insurance professional reserve class recognized net favorable prior year development of $4 million (2017: $7 million). The net favorable prior year loss development on this reserve class reflected the generally favorable experience on earlier accident years as the Company transitions to more experienced based methods.

For the three months endedMarch 31, 2018, the credit and surety reinsurance reserve class recorded net favorable prior year reserve development of $5 million (2017: $nil) due to the recognition of generally better than expected loss emergence.

Long-tail business

Long-tail business consists primarily of liability and motor reserve classes.

For the three months endedMarch 31, 2018, reinsurance liability reserve class contributed net favorable prior year reserve development of $2 million (2017: $24 million). The net favorable prior year reserve development for the three months endedMarch 31, 2017 primarily reflected the progressively increased weight given by management to experience based indications on older accident years, which has generally been favorable.

For the three months endedMarch 31, 2018, the motor reinsurance reserve classes contributed net favorable prior year reserve development of $3 million (2017: net adverse prior year reserve development of $22 million). The net adverse prior year reserve development for the three months endedMarch 31, 2017 was primarily due to the decrease in the discount rate used to calculate lump sum awards in U.K. bodily injury cases, known as the Ogden Rate which changed from plus 2.5% to minus 0.75% effective March 20, 2017.

For the three months endedMarch 31, 2018, the insurance liability reserve class recorded net adverse prior year development of $7 million (2017: $4 million) primarily related to reserve strengthening within the Company's U.S. excess casualty business reflecting slightly higher than expected prior year emerging loss experience.

At March 31, 2018, net reserves for losses and loss expenses includes estimated amounts for numerous catastrophe events. The magnitude and/or complexity of losses arising from these events, in particular Hurricanes Harvey, Irma and Maria, the two earthquakes in Mexico and the wildfires in Northern and Southern California which occurred in 2017, inherently increase the level of uncertainty and, therefore, the level of management judgment involved in arriving at the estimated net reserves for losses and loss expenses. As a result, actual losses for these events may ultimately differ materially from our current estimates.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

7. EARNINGS PER COMMON SHARE

The following table presents a comparison of basic and diluted earnings per common share:

	Three months ended March 31,
	2018		2017
Basic earnings per common share
Net income	$	73,202	$	19,855
Less: preferred share dividends	10,656		14,841
Net income available to common shareholders	62,546		5,014
Weighted average common shares outstanding - basic	83,322		86,022
Basic earnings per common share	$	0.75	$	0.06
Diluted earnings per common share
Net income available to common shareholders	$	62,546	$	5,014
Weighted average common shares outstanding - basic	83,322		86,022
Share-based compensation plans	399		771
Weighted average common shares outstanding - diluted	83,721		86,793
Diluted earnings per common share	$	0.75	$	0.06
Weighted average anti-dilutive shares excluded from the dilutive computation	810		551

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

8. SHARE-BASED COMPENSATION

For the three months endedMarch 31,2018, the Company incurred share-based compensation costs of $16 million (2017: $29 million) related to restricted stock awards, share-settled restricted stock units, and cash-settled restricted stock units and recorded associated tax benefits of $2 million (2017: $7 million).

The fair value of share-settled restricted stock units and cash-settled restricted stock units that vested during the three months endedMarch 31,2018 was $42 million (2017: $120 million, which included $44 million attributable to a grant of three year cliff vesting service-based awards made in 2014). At March 31,2018 there were $137 million of unrecognized compensation costs (2017: $130 million), which are expected to be recognized over the weighted average period of 3.0 years.

Share-settled Awards

The following table provides a summary of nonvested share settled restricted stock units for the three months endedMarch 31,2018:

	Share Settled Performance Vesting Restricted Stock Units				Share Settled - Service Based Restricted Stock Units
	Number of Restricted Stock Units		Weighted  Average Grant Date Fair Value(1)		Number of Restricted Stock Units		Weighted  Average Grant Date Fair Value(1)
Nonvested restricted stock units - beginning of period	230		$	57.08	1,355		$	57.09
Granted	104		48.89		711		49.07
Vested	(51	)	53.81		(455	)	54.44
Forfeited	—		—		(20	)	57.45
Nonvested restricted stock units - end of period	283		$	54.68	1,591		$	54.18

(1) Fair value is based on the closing price of our common shares on the grant approval date.

Cash-settled awards

The following table provides a summary of nonvested cash settled restricted stock units for the three months endedMarch 31,2018:

	Cash Settled Performance Vesting Restricted Stock Units		Cash Settled Service-based Restricted Stock Units
	Number of Restricted Stock Units		Number of Restricted Stock Units
Nonvested restricted stock units - beginning of period	42		988
Granted	—		449
Vested	(12	)	(360	)
Forfeited	—		(20	)
Nonvested restricted stock units - end of period	30		1,057

At March 31,2018, the liability for cash-settled restricted stock units, included in other liabilities in the Consolidated Balance Sheets, was $9 million (2017: $9 million).

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

9.    SHAREHOLDERS' EQUITY

The following table presents common shares issued and outstanding:

	Three months ended March 31,
	2018		2017
Shares issued, balance at beginning of period	176,580		176,580
Shares issued	—		—
Total shares issued at end of period	176,580		176,580
Treasury shares, balance at beginning of period	(93,419	)	(90,139	)
Shares repurchased	(149	)	(2,229	)
Shares reissued	506		958
Total treasury shares at end of period	(93,062	)	(91,410	)
Total shares outstanding	83,518		85,170

Treasury Shares

The following table presents share repurchases:

	Three months ended March 31,
	2018		2017
In the open market:
Total shares	—		1,896
Total cost	$	—	$	127,982
Average price per share(1)	$	—	$	67.52
From employees:(2)
Total shares	149		333
Total cost	$	7,163	$	23,260
Average price per share(1)	$	48.08	$	69.80
Total shares repurchased:
Total shares	149		2,229
Total cost	$	7,163	$	151,242
Average price per share(1)	$	48.08	$	67.86

(1) Calculated using whole numbers.

(2) Shares are repurchased from employees to satisfy withholding tax liabilities upon the vesting of restricted stock awards and restricted stock units.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

10. DEBT AND FINANCING ARRANGEMENTS

On March 28, 2018, certain of AXIS Capital’s operating subsidiaries (the "Participating Subsidiaries") amended their existing $250 million secured letter of credit facility with Citibank Europe plc (the "$250 Million Facility") under their aggregate $750 million secured letter of credit facility with Citibank Europe plc (the "$750 Million Facility") to extend the expiration date to March 31, 2019.

The terms and conditions of the additional $500 million secured letter of credit facility under the $750 Million Facility remain unchanged. The $500 million secured letter of credit facility expires December 31, 2019.

Letters of credit issued under the $750 Million Facility will principally be used to support the reinsurance obligations of the Participating Subsidiaries. The Participating Subsidiaries are subject to certain covenants, including the requirement to maintain sufficient collateral to cover obligations outstanding under the $750 Million Facility. In the event of default, Citibank Europe plc may exercise certain remedies, including the exercise of control over pledged collateral and the termination of the availability of the $750 Million Facility to any or all of the Participating Subsidiaries.

11. COMMITMENTS AND CONTINGENCIES

Legal Proceedings

From time to time, the Company is subject to routine legal proceedings, including arbitrations, arising in the ordinary course of business. These legal proceedings generally relate to claims asserted by or against the Company in the ordinary course of insurance or reinsurance operations. Estimated amounts payable under such proceedings are included in the reserve for losses and loss expenses in the Consolidated Balance Sheets.

The Company is not party to any material legal proceedings arising outside the ordinary course of business.

Investments

Refer to Note 3 - 'Investments' for information on the Company's unfunded investment commitments related to the Company's other investment portfolio.

12. OTHER COMPREHENSIVE INCOME (LOSS)

The tax effects allocated to each component of other comprehensive income (loss) are shown in the following table:

	2018									2017
	Before Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Before Tax Amount		Tax (Expense) Benefit			Net of Tax Amount
Three months ended March 31,
Available for sale investments:
Unrealized investment gains (losses) arising during the period	$	(105,675	)	$	(6,516	)	$	(112,191	)	$	70,372	$	(2,669	)	$	67,703
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	(4,112		)	4,897			785			25,759		(791		)	24,968
Unrealized investment gains (losses) arising during the period, net of reclassification adjustment(1)	(109,787		)	(1,619		)	(111,406		)	96,131		(3,460		)	92,671
Foreign currency translation adjustment	1,270			—			1,270			29,869		—			29,869
Total other comprehensive income (loss), net of tax	$	(108,517	)	$	(1,619	)	$	(110,136	)	$	126,000	$	(3,460	)	$	122,540

(1) Effective January 1, 2018, the Company adopted ASU No. 2016-01. The adoption of this guidance resulted in a cumulative adjustment to reclassify unrealized investment gains on equity securities from accumulated other comprehensive income to retained earnings. As prescribed, the prior period has not been restated to conform to the current presentation. Refer to Item 1, Note 1 'Basis of Presentation and Significant Accounting Policies' to the Consolidated Financial Statements for additional information.

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AXIS CAPITAL HOLDINGS LIMITED

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

12.    OTHER COMPREHENSIVE INCOME (LOSS) CONTINUED

Reclassifications from AOCI to net income available to common shareholders are shown in the following table:

		Amount Reclassified from AOCI(1)
Details About AOCI Components	Consolidated Statement of Operations Line Item That Includes Reclassification	Three months ended March 31,
		2018			2017
Unrealized investment gains (losses) on available for sale investments
	Other investment gains (losses)	$	4,526		$	(19,206	)
	OTTI losses	(414		)	(6,553		)
	Total before tax	4,112			(25,759		)
	Income tax (expense) benefit	(4,897		)	791
	Net of tax	$	(785	)	$	(24,968	)
Foreign currency translation adjustment
	Foreign exchange loss	$	—		$	(24,149	)
	Income tax (expense) benefit	—			—
	Net of tax	$	—		$	(24,149	)

(1) Amounts in parentheses are debits to net income (loss) available to common shareholders.

On March 27, 2017, as part of the wind down of our Australia operation, the Australia Prudential Regulation Authority revoked the authorization of AXIS Specialty Australia to carry on insurance business in Australia. As this resulted in the substantial liquidation of AXIS Specialty Australia, we have released the cumulative translation adjustment related to AXIS Specialty Australia of $24 million from accumulated other comprehensive income in the Consolidated Balance Sheet to foreign exchange losses in the Consolidated Statement of Operations.

13. SUBSEQUENT EVENTS

On April 16 2018, the Company entered into a quota share and adverse development cover reinsurance agreement, a retroactive

contract which was deemed to have met the established criteria for retroactive reinsurance accounting. The Company will recognize reinsurance recoverable on unpaid losses of $108 million related to this reinsurance agreement.

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ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following is a discussion and analysis of our financial condition and results of operations. This should be read in conjunction with the consolidated financial statements and related notes included in Item 1 of this report and also our Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in our Annual Report on Form 10-K for the year ended December 31,2017. Tabular dollars are in thousands, except per share amounts. Amounts in tables may not reconcile due to rounding differences.

	Page
First Quarter 2018 Financial Highlights	49
Executive Summary	50
Underwriting Results – Group	60
Results by Segment: For the three months ended March 31, 2018 and 2017	68
i) Insurance Segment	68
ii) Reinsurance Segment	72
Other Expenses (Revenues), Net	75
Net Investment Income and Net Investment Gains (Losses)	77
Cash and Investments	79
Liquidity and Capital Resources	82
Critical Accounting Estimates	84
Recent Accounting Pronouncements	84
Off-Balance Sheet and Special Purpose Entity Arrangements	84

48

FIRST QUARTER 2018 FINANCIAL HIGHLIGHTS

First Quarter 2018 Consolidated Results of Operations

• Net income attributable to common shareholders of $63 million, or $0.75 per common share and diluted common share

• Operating income⁽¹⁾ of $123 million, or $1.46 per diluted common share⁽¹⁾

• Gross premiums written of $2.7 billion

• Net premiums written of $2.0 billion

• Net premiums earned of $1.2 billion

• Net favorable prior year reserve development of $54 million

• Estimated pre-tax catastrophe and weather-related losses of $35 million, or 3.0 points on current accident year loss ratio compared to $35 million, or 3.7 points for the first quarter of 2017

• Underwriting income⁽²⁾ of $144 million and combined ratio of 90.8%

• Net investment income of $101 million

• Net realized investment losses of $15 million

• Foreign exchange losses of $38 million

First Quarter 2018 Consolidated Financial Condition

• Total cash and investments of $15.4 billion; fixed maturities, cash and short-term securities comprise 88% of total cash and investments and have an average credit rating of AA-

• Total assets of $25.1 billion

• Reserve for losses and loss expenses of $12.0 billion and reinsurance recoverable of $3.1 billion

• Total debt of $1.4 billion and the debt to total capital ratio of 20.7%

• Total common shares repurchased for $7 million.

• Following the offer to acquire Novae Group plc ("Novae") on July 5, 2017, the Company suspended its open market share repurchase program. We acquired Novae on October 2, 2017.

• Common shareholders’ equity of $4.5 billion and diluted book value per common share of $52.57

(1) Operating income (loss) and operating income (loss) per diluted common share are non-GAAP financial measures as defined in Item 10(e) of SEC Regulation S-K. The reconciliations of non-GAAP measures to the most comparable GAAP financial measures (net income (loss) available to common shareholders and diluted earnings per common share, respectively) are provided in 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Executive Summary – Results of Operations'.

(2) Consolidated underwriting income (loss) is a non-GAAP financial measure as defined in Item 10(e) of SEC Regulation S-K. The reconciliation to net income (loss) before income taxes and interest in income (loss) of equity method investments, the most comparable GAAP measure, is presented in 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Executive Summary – Results of Operations'.

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EXECUTIVE SUMMARY

Business Overview

We are a Bermuda-based global provider of specialty lines insurance and reinsurance products with operations in Bermuda, the United States ("U.S."), Europe, Singapore, Canada, Latin America and the Middle East. Our underwriting operations are organized around our two global underwriting platforms, AXIS Insurance and AXIS Re.

Our mission is to provide our clients and distribution partners with a broad range of risk transfer products and services and meaningful capacity, backed by significant financial strength. We manage our portfolio holistically, aiming to construct the optimum consolidated portfolio of funded and unfunded risks, consistent with our risk appetite and development of our franchise. We nurture an ethical, entrepreneurial and disciplined culture that promotes outstanding client service, intelligent risk taking and the achievement of superior risk-adjusted returns for our shareholders. We believe that the achievement of our objectives will position us as a global leader in specialty risks. Our execution on this strategy for the first three months of 2018 included: 

• increased relevance in a select number of attractive specialty insurance and reinsurance markets and continued implementation of a more focused distribution strategy;

• continued to grow a leadership position in business lines with strong growth potential including accident and health, cyber and renewable energy;

• growth of our syndicate at Lloyd's of London ("Lloyd's"), which provides us with access to Lloyd's worldwide licenses and an extensive distribution network.

• continued re-balancing of our portfolio towards less volatile lines of business that carry attractive rates;

• launched a new phase of our transformation efforts, an enterprise-wide program to further modernize all of our functions and position us to lead in a transforming industry;

• continued improvement in the effectiveness and efficiency of our operating platforms and processes;

• increased investment in data and analytics; and

• broadened risk-funding sources and developed vehicles that utilize third-party capital.

Reinsurance to Close ("RITC") of the 2015 and Prior Years of Account of Syndicate 2007

On January 1, 2018, AXIS Managing Agency Limited, the managing agent of Syndicate 2007 entered into an agreement for the RITC of the 2015 and prior years of account of Syndicate 2007. Under the terms of this agreement, we ceded $819 million of reserves for losses and loss expenses, which were included in Syndicate 2007's balance sheet at December 31, 2017, to a reinsurer. This agreement was accounted for as a novation reinsurance contract. During the three months ended March 31, 2018, we recognized a reduction in reserves for losses and loss expenses of $819 million representing the transfer of liabilities to the reinsurer, a reduction in investments and cash of $688 million representing the consideration paid to the reinsurer and a payable of $131 million representing the consideration due to the reinsurer.

Realignment of our Accident and Health Business

On January 23, 2018, we announced plans to realign our accident and health business by integrating our business and its operations into the our insurance and reinsurance operations. Through this realignment, our accident and health business is expected to benefit from the greater scale and market presence of our property and casualty insurance and reinsurance businesses and operations.

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The realignment of the our accident and health business into our insurance and reinsurance segments took place in the first quarter of 2018.Financial results relating to this business were previously included in the results of our insurance segment. As a result of the realignment, accident and health results are included in the results of both our insurance and reinsurance segments with effect from January 1, 2018. To facilitate comparison of information across periods, certain reclassifications have been made to prior year amounts to conform to the current year's presentation.

Outlook

We are committed to being a leader in specialty risk, an area in which we already have depth of talent and experience, and have earned an outstanding reputation. Committed to our hybrid strategy, we have developed substantial platforms in both insurance and reinsurance, providing us with balance and diversification. Management believes its positioning, franchise, expert underwriters and strong relationships with distributors and clients will provide opportunities for further profitable growth in 2018, with variances amongst our lines driven by our tactical response to market conditions. At the same time, we are broadening our risk-funding sources and developing vehicles that utilize the industry’s available third party capital. Consequently, we expect that our net premiums written will not grow as much as our gross premiums written, as we intend to share more of our risk with strategic capital partners.

The insurance market has begun to respond to the cumulative effects of many years of price deterioration and the record significant catastrophe activity incurred in 2017. Market conditions and rates across most lines have generally improved, with catastrophe exposed property lines experiencing the most upward rate momentum. While market conditions have improved they will likely remain variable through the year and possibly beyond as carriers assess pricing, portfolio construction and account preferences. In this competitive market environment with mixed market conditions, we are focusing on lines of business and market segments that are adequately priced. In addition, our acquisition of Novae increases our scale and relevance in the London marketplace, and we expect to be well-positioned to capitalize on new opportunities and benefit from improved market conditions emerging through the international specialty insurance market, including Lloyd's of London.

The reinsurance market is experiencing some upward movement in price after the substantial loss activity that occurred in 2017. These increases, both in catastrophe and other lines of business, are necessary to improve adequacy of rates and vary across geographies. The market overall is strongly capitalized and demand side conditions, while largely stable, do present opportunities to support clients in a world of changing exposures, regulation, and reinsurance panels. We also believe that there is a real opportunity to achieve more leadership and scale, emphasizing our clients and new streams of income in the future while still defending the quality of our existing portfolio. We are also focused on managing the volatility of our portfolio and expanding our already strong group of strategic capital partners.

Non-GAAP Financial Measures

We present our results of operations in the way we believe will be most meaningful and useful to investors, analysts, rating agencies and others who use our financial information to evaluate our performance. Some of the measurements we use are non-GAAP financial measures under SEC rules and regulations. In this Management's Discussion and Analysis of Financial Condition and Results of Operations ("MD&A"), we present underwriting-related general and administrative expenses, consolidated underwriting income, operating income (in total and on a per share basis), amounts presented on a constant currency basis, and pre-tax total return on cash and investments excluding foreign exchange movements, which are non-GAAP financial measures as defined in Item 10(e) of SEC Regulation S-K. We believe that these non-GAAP financial measures, which may be defined and calculated differently by other companies, better explain and enhance the understanding of our results of operations. However, these measures should not be viewed as a substitute for those determined in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP").

Underwriting-Related General and Administrative Expenses

Underwriting-related general and administrative expenses include those general and administrative expenses that are incremental and/or directly attributable to our individual underwriting operations. While this measure is presented in Item 1, Note 2 to the Consolidated Financial Statements 'Segment Information', it is considered a non-GAAP financial measure when presented elsewhere on a consolidated basis.

Corporate expenses include holding company costs necessary to support our worldwide insurance and reinsurance operations and costs associated with operating as a publicly-traded company. As these costs are not incremental and/or directly attributable to our individual underwriting operations, we exclude them from underwriting-related general and administrative expenses and, therefore,

51

consolidated underwriting income. General and administrative expenses, the most comparable GAAP financial measure to underwriting-related general and administrative expenses, also includes corporate expenses.

The reconciliation of underwriting-related general and administrative expenses to general and administrative expenses, the most comparable GAAP measure, is presented in Management’s Discussion and Analysis of Financial Condition and Results of Operations – Executive Summary – Results of Operations'.

Consolidated Underwriting Income

Consolidated underwriting income is a pre-tax measure of underwriting profitability that takes into account net premiums earned and other insurance related income (losses) as revenues and net losses and loss expenses, acquisition costs and underwriting-related general and administrative costs as expenses. While this measure is presented in Item 1, Note 2 to the Consolidated Financial Statements 'Segment Information', it is considered a non-GAAP financial measure when presented elsewhere on a consolidated basis.

We evaluate our underwriting results separately from the performance of our investment portfolio. As such, we believe it is appropriate to exclude net investment income and net investment gains (losses) from our underwriting profitability measure.

Foreign exchange losses (gains) in our Consolidated Statements of Operations primarily relate to our net insurance-related liabilities. However, we manage our investment portfolio in such a way that unrealized and realized foreign exchange losses (gains) on our investment portfolio generally offset a large portion of the foreign exchange losses (gains) arising from our underwriting portfolio. As a result, we believe that foreign exchange losses (gains) are not a meaningful contributor to our underwriting performance, therefore, these expenses are excluded from consolidated underwriting income.

Interest expense and financing costs primarily relate to interest payable on our senior notes and notes payable. As these costs are not incremental and/or directly attributable to our individual underwriting operations, we exclude them from underwriting-related general and administrative expenses, therefore, these expenses are excluded from consolidated underwriting income.

Reorganization expenses are driven by business decisions, the nature and timing of which are not related to the underwriting process therefore, these expenses are excluded from consolidated underwriting income.

Amortization of intangibles including value of business acquired arose from business decisions, the nature and timing of which are not related to the underwriting process therefore, these expenses are excluded from consolidated underwriting income.

We believe that presentation of underwriting-related general and administrative expenses and consolidated underwriting income provides investors with an enhanced understanding of our results of operations, by highlighting the underlying pre-tax profitability of our underwriting activities. The reconciliation of consolidated underwriting income to income before income taxes and interest in income (loss) of equity method investments, the most comparable GAAP measure is presented in Management’s Discussion and Analysis of Financial Condition and Results of Operations – Executive Summary – Results of Operations'.

Operating Income

Operating income represents after-tax operational results without consideration of after-tax net investment gains (losses), foreign exchange losses (gains), and reorganization expenses.

Although the investment of premiums to generate income and investment gains (losses) is an integral part of our operations, the determination to realize investment gains (losses) is independent of the underwriting process and is heavily influenced by the availability of market opportunities. Furthermore, many users believe that the timing of the realization of investment gains (losses) is somewhat opportunistic for many companies.

Foreign exchange losses (gains) in our Consolidated Statements of Operations are primarily driven by the impact of foreign exchange rate movements on net insurance related-liabilities. However, this movement is only one element of the overall impact of foreign exchange rate fluctuations on our financial position. In addition, we recognize unrealized foreign exchange losses (gains) on our available-for-sale investments in other comprehensive income and foreign exchange losses (gains) realized upon the sale of these investments in net investments gains (losses). These unrealized and realized foreign exchange losses (gains) generally offset a large portion of the foreign exchange losses (gains) reported separately in net income (loss), thereby minimizing the impact of foreign

52

exchange rate movements on total shareholders' equity. As such, foreign exchange losses (gains) in our Statement of Operations in isolation are not a fair representation of the performance of our business.

Reorganization expenses are primarily driven by business decisions, the nature and timing of which are not related to the underwriting process and are not representative of underlying business performance.

Certain users of our financial statements evaluate performance excluding after-tax net investment gains (losses), foreign exchange losses (gains), and reorganization expenses to understand the profitability of recurring sources of income.

We believe that showing net income (loss) available to common shareholders exclusive of net investment gains (losses), foreign exchange losses (gains) and reorganization expenses reflects the underlying fundamentals of our business. In addition, we believe that this presentation enables investors and other users of our financial information to analyze performance in a manner similar to how our management analyzes the underlying business performance. We also believe this measure follows industry practice and, therefore, facilitates comparison of our performance with our peer group. We believe that equity analysts and certain rating agencies that follow us, and the insurance industry as a whole, generally exclude these items from their analyses for the same reasons. The reconciliation of operating income to net income (loss) available to common shareholders, the most comparable GAAP measure, is presented in 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Executive Summary – Results of Operations'.

Constant Currency Basis

We present gross premiums written, net premiums written and net premiums earned on a constant currency basis in this MD&A. The amounts presented on a constant currency basis are calculated by applying the average foreign exchange rate from the current year to the prior year amounts. We believe this presentation enables investors and other users of our financial information to analyze growth in gross premiums written, net premiums written and net premiums earned on a constant basis. The reconciliation to gross premiums written, net premiums written and net premiums earned on a GAAP basis is presented in 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Group Underwriting Results' .

Pre-Tax Total Return on Cash and Investments excluding Foreign Exchange Movement

Pre-tax total return on cash and investments excluding foreign exchange movements measures net investment income (loss), net investments gains (losses), interest in income (loss) of equity method investments, and pre-tax change in unrealized gains (losses) generated by our average cash and investment balances. The reconciliation to pre-tax total return on cash and investments, the most comparable GAAP financial measure is presented in the 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Net Investment Income and Net Investment Gains (Losses)'. We believe this presentation enables investors and other users of our financial information to analyze the performance of our investments.

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Results of Operations

	Three months ended March 31,
	2018				% Change	2017
Underwriting revenues:
Net premiums earned	$	1,167,402			24%	$	938,703
Other insurance related income (losses)	6,606				nm	(3,783		)
Underwriting expenses:
Net losses and loss expenses	(661,345		)		9%	(606,942		)
Acquisition costs	(229,260		)		21%	(189,792		)
Underwriting general and administrative expenses(1)	(139,666		)		15%	(121,801		)
Underwriting Income	$	143,737				$	16,385
Corporate expenses(1)	(30,171		)		(24%)	(39,459		)
Net investment income	100,999				2%	98,664
Net investment losses	(14,830		)		(41%)	(25,050		)
Other (expenses) revenues, net	(54,623		)		59%	(34,256		)
Reorganization expenses	(13,054		)		nm	—
Amortization of value of business acquired	(57,110		)		nm	—
Amortization of intangibles	(2,782		)	—	nm	—
Income before income taxes and interest in income (loss) of equity method investments	72,166					16,284
Income tax benefit	1,036				(89%)	9,337
Interest in loss of equity method investments	—				nm	(5,766		)
Net income	$	73,202				$	19,855
Preferred share dividends	(10,656		)		(28%)	(14,841		)
Net income available to common shareholders	$	62,546			nm	$	5,014
Net investment losses, net of tax(2)	$	15,973			(34%)	$	24,227
Foreign exchange losses, net of tax(3)	33,535				54%	21,723
Reorganization expenses, net of tax (4)	10,583				nm	—
Operating income	$	122,637			nm	$	50,964

nm – not meaningful

(1) Underwriting-related general and administrative expenses is a non-GAAP measure as defined in Item 10(e) of SEC Regulation S-K. The reconciliation to general and administrative expenses, the most comparable GAAP measure, also included corporate expenses of $30,171 and $39,459 for the three months ended March 31, 2018 and 2017, respectively. Refer to 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Other Expenses (Revenues), Net' for additional information related to the corporate expenses. Also, refer to 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Non-GAAP Financial Measures' for additional information.

(2) Tax cost (benefit) of $1,143 and ($823) for the three months endedMarch 31, 2018 and 2017, respectively. Tax impact is estimated by applying the statutory rates of applicable jurisdictions, after consideration of other relevant factors including the ability to utilize capital losses.

(3) Tax cost (benefit) of ($4,325) and $258 for the three months endedMarch 31, 2018 and 2017, respectively. Tax impact is estimated by applying the statutory rates of applicable jurisdictions, after consideration of other relevant factors including the tax status of specific foreign exchange transactions.

(4) Tax cost (benefit) of ($2,471) and $nil for the three months endedMarch 31, 2018 and 2017, respectively. Tax impact is estimated by applying the statutory rates of applicable jurisdictions, after consideration of other relevant factors including the tax status of specific foreign exchange transactions.

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Non-GAAP Financial Measures

We also present operating income per diluted common share and annualized operating return on average common equity ("annualized operating ROACE"), which are derived from the operating income measure and can be reconciled to the most comparable GAAP financial measures as follows:

	Three months ended March 31,
	2018			2017
Net income available to common shareholders	$	62,546		$	5,014
Operating income	122,637			50,964
Weighted average common shares and common share equivalents - diluted(1)	83,721			86,793
Earnings per common share - diluted	$	0.75		$	0.06
Operating income per common share - diluted	$	1.46		$	0.59
Average common shareholders’ equity	$	4,527,830		$	5,125,294
Annualized return on average common equity(2)	5.5		%	0.4		%
Annualized operating return on average common equity(3)	10.8		%	4.0		%

(1) Refer to Item 1, Note 7 to our Consolidated Financial Statements 'Earnings per Common Share' for additional information on the dilution calculation.

(2) Annualized return on average common equity ("ROACE") is calculated by dividing annualized net income (loss) available to common shareholders for the period by the average shareholders' equity determined by using the common shareholders' equity balances at the beginning and end of the period.

(3) Annualized operating ROACE, a non-GAAP financial measure as defined in Item 10(e) of SEC Regulation S-K, is calculated by dividing annualized operating income for the period by the average common shareholders' equity. The reconciliation to ROACE, the most comparable GAAP measure, is presented above in 'Management’s Discussion and Analysis of Financial Condition and Results of Operations –Results of Operations', Also, refer to 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Non-GAAP Financial Measures' for additional information.

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Underwriting Results

Total underwriting income for the three months endedMarch 31, 2018 was $144 million, an increase of $127 million compared to the underwriting income of $16 million for the three months endedMarch 31, 2017. The increase in underwriting income was primarily driven by an increase in net premiums earned, a decrease in the current accident year loss ratio excluding catastrophe and weather-related losses, an increase in net favorable prior year reserve development, an increase in other insurance-related income, partially offset by an increase in general and administrative expenses.

The reinsurance segment underwriting income increased by $70 million for the three months endedMarch 31, 2018, compared to the three months endedMarch 31, 2017. The increase in underwriting income was primarily driven by an increase in net premiums earned, a decrease in the current accident year loss ratio excluding catastrophe and weather-related losses, an increase in net favorable prior year reserve development, an increase in other insurance-related income and a decrease in catastrophe and weather-related losses.

The insurance segment underwriting income increased by $58 million for the three months endedMarch 31, 2018, compared to the three months endedMarch 31, 2017. The increase in underwriting income was primarily driven by an increase in net premiums earned, an increase in net favorable prior year reserve development, a decrease in the current accident year loss ratio excluding catastrophe and weather-related losses, partially offset by an increase in catastrophe and weather-related losses, and general and administrative expenses.

Net Investment Income

Net investment income for the three months endedMarch 31, 2018 was $101 million, an increase of $2 million, compared to the three months endedMarch 31, 2017.

Net Investment Gains (Losses)

Net investment losses were $15 million for the three months endedMarch 31, 2018 compared to $25 million for the same period of 2017. Net investment losses for the three months endedMarch 31, 2018 were mainly attributable to net unrealized investment losses on equity securities recognized in the income statement due to the adoption of Accounting Standards Update ("ASU") ASU 2016-01 "Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities,". Net realized investment losses for the three months endedMarch 31, 2017 were primarily attributable to foreign exchange losses on non-U.S. denominated securities due to the strengthening of the U.S. dollar, and by other-than-temporary impairment ("OTTI") charges.

Other Expenses (Revenues), Net

Corporate expenses were $30 million for the three months endedMarch 31, 2018, compared to $39 million for the three months endedMarch 31, 2017. The decrease was primarily attributable to a decrease in personnel costs and executive transition costs, together with an increase in the allocation of corporate costs to the insurance and reinsurance segments, partially offset by an increase in information technology costs.

Foreign exchange losses were $38 million for the three months endedMarch 31, 2018, compared to $21 million for the three months endedMarch 31, 2017. Foreign exchange losses for the three months endedMarch 31, 2018 were primarily attributable to the impact of the weakening of the U.S. dollar on the remeasurement of net insurance-related liabilities mainly denominated in pound sterling and euro.

The financial results for the three months endedMarch 31, 2018 resulted in a tax benefit of $1 million compared to $9 million for the three months ended March 31, 2017. The tax benefit of $1 million recognized in the three months endedMarch 31, 2018 was primarily driven by the generation of pre-tax losses in our U.K. operations , largely offset by the generation of pre-tax income in our U.S. operations. The tax benefit recognized in 2017 was primarily attributable to share based compensation excess tax benefits recognized in the income statement due to the adoption of ASU 2016-09, "Compensation-Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting", as well as underwriting losses recognized in our U.S. and European operations.

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Interest expense and financing costs were $17 million for the three months endedMarch 31, 2018, compared to $13 million for the three months ended March 31, 2017. The increase was primarily attributable to interest due on the 4.0% Senior Notes issued by the Company in the fourth quarter of 2017, as well as interest due on the Dekania Notes issued by Novae in 2004.

Reorganization Expenses

Reorganization related expenses were $13 million for the three months endedMarch 31, 2018, compared to $nil for the three months ended March 31, 2017, related to a new transformation program launched earlier this year. This program encompasses the integration of Novae which commenced in the fourth quarter of 2017, the realignment of our accident and health business together with other initiatives designed to increase our efficiency and enhance our profitability while delivering a customer-centric operating model.

We expect to achieve annual run-rate cost savings of approximately $100 million with effect from 2020. These expense savings will be achieved through the elimination of redundant roles, efficiencies introduced through organizational redesign, operating efficiency improvements, integration of systems, and the rationalization of third party contracts and professional fees.

In order to achieve annual run-rate cost savings across the transformation program with effect from 2020, we expect to incur cumulative pre-tax reorganization charges of approximately $100 million by 2020. Pre-tax reorganization charges of $28 million were incurred in the two most recent quarters. These expenses are not included in operating income.

Interest in Loss of Equity Method Investments

Interest in loss of equity method investments represents our aggregate share of losses related to investments in which we have significant influence over the operating and financial policies of the investee.

The three months endedMarch 31, 2017 included impairment losses of $6 million related to an investment in a U.S. based insurance company, partially offset by income related to our aggregate share of profits in a company in which we had significant influence over the operating and financial policies.

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Financial Measures

We believe the following financial indicators are important in evaluating our performance and measuring the overall growth in value generated for our common shareholders:

	Three months ended and at March 31,
	2018			2017
Annualized ROACE	5.5		%	0.4		%
Annualized operating ROACE	10.8		%	4.0		%
Diluted book value per common share(1)	$	52.57		$	58.89
Cash dividends declared per common share	0.39			0.38
Increase (decrease) in diluted book value per common share adjusted for dividends	$	(0.92	)	$	1.00

nm – not meaningful

(1) Diluted book value per common share represents total common shareholders’ equity divided by the number of common shares and diluted common share equivalents outstanding, determined using the treasury stock method. Cash settled awards are excluded from the denominator.

Return on Equity

Our objective is to generate superior returns on capital that appropriately reward our common shareholders for the risks we assume and to grow revenue only when we expect the returns will meet or exceed our requirements. We recognize that the nature of underwriting cycles and the frequency or severity of large loss events in any one year may challenge the ability to achieve a profitability target in any specific period, therefore our goal is to achieve top-quintile industry operating ROACE and growth in book value per share adjusted for dividends, with volatility consistent with the industry average.

ROACE reflects the impact of net income attributable to common shareholders including net investment gains (losses), foreign exchange losses (gains), and reorganization expenses.

The increase in ROACE for the three months endedMarch 31, 2018, compared to the three months endedMarch 31, 2017, was primarily driven by an increase in underwriting income, together with a decrease in net investment losses and corporate expenses, partially offset by amortization of value of business acquired and intangible assets associated with the acquisition of Novae, reorganization expenses, and an increase in foreign exchange losses.

Operating ROACE excludes the impact of net investment gains (losses), foreign exchange losses (gains), and reorganization expenses.

The increase in operating ROACE for the three months endedMarch 31, 2018, compared to the three months endedMarch 31, 2017, was primarily driven by an increase in underwriting income and a decrease in corporate expense, partially offset by amortization of value of business acquired and intangible assets associated with the acquisition of Novae.

Diluted Book Value per Common Share

We consider diluted book value per common share to be an appropriate measure of our returns to common shareholders, as we believe growth in our book value on a diluted basis will ultimately translate into appreciation of our stock price.

Diluted book value per common share decreased by 11% to $52.57 at March 31, 2018, from $58.89 at March 31, 2017, which primarily reflected net losses attributable to common shareholders generated over the past twelve months of $358 million, common share dividends declared and unrealized investment losses reported in other comprehensive income.

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Cash Dividends Declared per Common Share

We believe in returning excess capital to our shareholders by way of dividends (as well as share repurchases) accordingly, our dividend policy is an integral part of the value we create for our shareholders. Our cumulatively strong earnings have permitted our Board of Directors to approve thirteen successive increases in quarterly common share dividends.

Diluted Book Value per Common Share Adjusted for Dividends

Diluted book value per common share adjusted for dividends decreased by $0.92 or 2% per common share for the three months endedMarch 31, 2018 and $4.78, or 8%, per common share over the past twelve months.

Taken together, we believe that growth in diluted book value per common share and common share dividends declared represent the total value created for our common shareholders. As companies in the insurance industry have differing dividend payout policies, we believe investors use the diluted book value per common share adjusted for dividends metric to measure comparable performance across the industry.

During the three months endedMarch 31, 2018, the decrease in diluted book value per common share adjusted for dividends was primarily driven by the unrealized investment losses reported in accumulated other comprehensive income, partially offset by the net income generated in the quarter.

During the three months endedMarch 31, 2017, total value created consisted primarily of the increase in unrealized gains on investments reported in accumulated other comprehensive income.

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UNDERWRITING RESULTS – GROUP

The following table provides our group underwriting results for the periods indicated. Underwriting income is a pre-tax measure of underwriting profitability that takes into account net premiums earned and other insurance related income (loss) as revenues and net losses and loss expenses, acquisition costs and underwriting-related general and administrative costs as expenses.

	Three months ended March 31,
	2018			% Change	2017
Revenues:
Gross premiums written	$	2,662,795		39%	$	1,911,871
Net premiums written	1,985,871			32%	1,508,959
Net premiums earned	1,167,402			24%	938,703
Other insurance related income (losses)	6,606			nm	(3,783		)
Expenses:
Current year net losses and loss expenses	(715,652		)		(631,735		)
Prior year reserve development	54,307				24,793
Acquisition costs	(229,260		)		(189,792		)
Underwriting-related general and administrative expenses(1)	(139,666		)		(121,801		)
Underwriting income(2)	$	143,737		nm	$	16,385
General and administrative expenses(1)	$	169,837			$	161,260
Income before income taxes and interest in income (loss) of equity method investments(2)	$	72,166			$	16,284

nm – not meaningful

(1) Underwriting-related general and administrative expenses is a non-GAAP measure as defined in Item 10(e) of SEC Regulation S-K. The reconciliation to general and administrative expenses, the most comparable GAAP measure, is presented in 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Executive Summary – Results of Operations'.

(2) Group (or consolidated) underwriting income (loss) is a non-GAAP financial measure as defined in Item 10(e) of SEC Regulation S-K. The reconciliation to net income (loss) before tax and interest in income (loss) of equity investments, the most comparable GAAP measure, is presented in 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Executive Summary – Results of Operations'.

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Underwriting Revenues

Gross and net premiums written by segment were as follows:

	Gross Premiums Written
	Three months ended March 31,
	2018		% Change	2017
Insurance	$	880,848	62%	$	545,261
Reinsurance	1,781,947		30%	1,366,610
Total	$	2,662,795	39%	$	1,911,871
% ceded
Insurance	38%		3 pts	35%
Reinsurance	19%		3 pts	16%
Total	25%		4 pts	21%
	Net Premiums Written
	Three months ended March 31,
	2018		% Change	2017
Insurance	$	547,893	54%	$	356,836
Reinsurance	1,437,978		25%	1,152,122
Total	$	1,985,871	32%	$	1,508,959

Gross Premiums Written:

Gross premiums written for the three months endedMarch 31, 2018increased by $751 million or 39% compared to the three months endedMarch 31, 2017. The increase for the three months endedMarch 31, 2018, compared to the same periods in 2017, was due to an increase in both the reinsurance and insurance segments.

The reinsurance segment's gross premiums written increased by $415 million or 30% for the three months endedMarch 31, 2018, compared to the same period in 2017. The increase in the reinsurance segment gross premiums written included $50 million attributable to catastrophe, marine and aviation lines associated with our acquisition of Novae. In addition, gross premiums written increased by $365 million, or 27% ($286 million or 21% on a constant currency basis¹) for the three months endedMarch 31, 2018 compared to the same period of 2017, driven by our motor, accident and health, credit and surety, catastrophe, liability, and professional lines, partially offset by decrease in marine and other lines. The increase in our motor, credit and surety, liability and professional lines was largely due to timing. In addition, the increase in our motor lines was driven by rate increases and new business. The increase in our accident and health, and catastrophe lines was due to new business. Increased line sizes on a number of treaties also contributed to the increase in catastrophe lines. These increases were partially offset by a decrease in marine and other lines due to the non-renewal of a large treaty.

The insurance segment's gross premiums written increased by $336 million or 62% for the three months endedMarch 31, 2018, compared to the same period in 2017. The increase in the insurance segment gross premiums written included $302 million attributable to property, marine, professional lines, and credit and political risk lines associated with our acquisition of Novae. In addition, gross premiums written increased by $34 million, or 6% ($28 million or 5% on a constant currency basis) for the three months endedMarch 31, 2018 comparable to the same period of 2017, attributable to our professional lines, liability, and accident and health lines driven by new business opportunities, together with an increase in our aviation lines associated with our acquisition of Aviabel which was completed last year.

(1) Amounts presented on a constant currency basis are non-GAAP financial measures as defined in Item10 (e) of SEC Regulation S-K. The constant currency basis is calculated by applying the average foreign exchange rate from the current year to the prior year balance.

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Ceded Premiums Written:

Ceded premiums written for the three months endedMarch 31, 2018 were $677 million or 25% of gross premiums written compared to $403 million or 21% for the three months endedMarch 31, 2017. The increase in the ceded premiums written was attributable to both segments.

The increase in the reinsurance segment ceded premiums written for the three months endedMarch 31, 2018 compared to the same period in 2017, included $31 million attributable to catastrophe and marine lines associated with the acquisition of Novae. In addition, ceded premiums written increased by $98 million, or 46% for the three months endedMarch 31, 2018 compared to the same period in 2017, attributable to our catastrophe, credit and surety, accident and health, liability and professional lines.

The increase in the insurance segment ceded premiums written for the three months endedMarch 31, 2018 compared to the same period in 2017, included $117 million primarily attributable to property, professional lines and marine lines associated with our acquisition of Novae. In addition, ceded premiums increased by $27 million or 14% for the three months endedMarch 31, 2018, compared to the same period in 2017 primarily driven by our professional lines and liability lines.

In June 2017, the Company obtained catastrophe protection for its insurance and reinsurance segments through a reinsurance agreement with Northshore Re II Limited ("Northshore"). In connection with the reinsurance agreement, Northshore issued notes to unrelated investors in an amount equal to the full $350 million of coverage provided under the reinsurance agreement covering a three year period. At the time of the agreement, the Company performed an evaluation of Northshore to determine if it meets the definition of a variable interest entity ("VIE"). The Company concluded that Northshore is a VIE but that the Company does not have a variable interest in the entity, as the variability in results is expected to be absorbed entirely by the investors in Northshore. Accordingly, Northshore is not consolidated in the Company's consolidated financial statements. Ceded premiums earned associated with the reinsurance agreement with Northshore during the three months endedMarch 31, 2018 was $6.7 million.

Net Premiums Earned:

Net premiums earned by segment were as follows:

	Three months ended March 31,
	2018				2017
Insurance	$	580,059	50	%	$	391,964	42	%
Reinsurance	587,343		50	%	546,739		58	%
Total	$	1,167,402	100	%	$	938,703	100	%

Net premiums earned for the three months endedMarch 31, 2018 increased by $229 million or 24% compared to the three months endedMarch 31, 2017. The increase for the three months endedMarch 31, 2018 compared to the same period in 2017, was driven by increases in both the insurance and reinsurance segments.

Net premiums earned increased by 48% in our insurance segment for the three months endedMarch 31, 2018 compared to the same period in 2017. The increase in net premiums earned included $178 million primarily attributable to property, marine, and accident and health lines associated with our acquisition of Novae. In addition, net premiums earned increased by $10 million, or 3% (2% on a constant currency basis) driven by strong premium growth in our accident and health lines in recent periods, together with premium growth in our aviation lines associated with the acquisition of Aviabel completed last year.

Net premiums earned increased by 7% in our reinsurance segment for the three months endedMarch 31, 2018 compared to the same period in 2017. The increase in net premiums earned included $13 million primarily attributable to marine and catastrophe lines associated with our acquisition of Novae. In addition, net premiums earned increased by $27 million, or 5% (4% on a constant currency basis) for the three months endedMarch 31, 2018 compared to the same period in 2017, driven by strong premium growth in our catastrophe, motor, and accident and health lines, partially offset by an increase in ceded premiums earned in our catastrophe lines.

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Other Insurance Related Income (Losses):

Other insurance related income was $7 million for the three months endedMarch 31, 2018, compared to other insurance related loss of $4 million for the same period in 2017. The increase in other insurance related income of $10 million for the three months endedMarch 31, 2018 compared to the same period in 2017, was driven by a decrease in realized losses and unfavorable mark-to-market adjustments on our weather and commodities derivative portfolio which we no longer write, partially offset by favorable mark-to-market adjustments on other insurance and reinsurance contracts accounted for as derivatives and an increase in fees from strategic capital partners.

Underwriting Expenses

The following table provides a breakdown of our combined ratio:

	Three months ended March 31,
	2018		% Point Change	2017
Current accident year loss ratio	61.3	%	(6.0)	67.3	%
Prior year reserve development	(4.6	%)	(2.0)	(2.6	%)
Acquisition cost ratio	19.6	%	(0.6)	20.2	%
General and administrative expense ratio(1)	14.5	%	(2.7)	17.2	%
Combined ratio	90.8	%	(11.3)	102.1	%

(1) The general and administrative expense ratio includes corporate expenses not allocated to reportable segments of 2.6% and 4.2% for the three months ended March 31, 2018 and 2017, respectively. These costs are further discussed in 'Management’s Discussion and Analysis of Financial Condition and Results of Operations – Other Expenses (Revenues), Net'

Current Accident Year Loss Ratio:

The current accident year loss ratio decreased to 61.3% for the three months endedMarch 31, 2018, from 67.3% for the same period in 2017.

The decrease in the current accident year loss ratio for the three months endedMarch 31, 2018 compared to the same period in 2017, was attributable to both segments. During the three months endedMarch 31, 2018 we incurred pre-tax catastrophe and weather-related losses, of $35 million or 3.0 points primarily attributable to the Papua New Guinea earthquake, Windstorm Friederike and U.S. and European weather-related events. Comparatively, during the three months endedMarch 31, 2017 we incurred pre-tax catastrophe and weather-related losses, of $35 million, or 3.7 points.

After adjusting for the impact of the catastrophe and weather-related losses, our current accident year loss ratio for the three months endedMarch 31, 2018 was 58.3% compared to 63.6% for the same period in 2017.

The decrease in the current accident year loss ratio after adjusting for the impact of the catastrophe and weather-related losses for the three months endedMarch 31, 2018 compared to the same period in 2017, was driven by changes in business mix, together with favorable impact of rate and trend in both segments, a decrease in mid-size loss experience, partially offset by mid-size and attritional loss experience in our insurance aviation lines.

For further discussion on current accident year loss ratios, refer to the insurance and reinsurance segment discussions below.

Estimates of Significant Catastrophe Events

Our March 31, 2018 net reserves for losses and loss expenses includes estimated amounts for numerous catastrophe events. We caution that the magnitude and/or complexity of losses arising from certain of these events, in particular Hurricanes Harvey, Irma and Maria, the two earthquakes in Mexico and the wildfires in Northern and Southern California which occurred in 2017 inherently increase the level of uncertainty and, therefore, the level of management judgment involved in arriving at our estimated net reserves for losses and loss expenses. As a result, our actual losses for these events may ultimately differ materially from our current estimates.

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Our estimated net losses in relation to the catastrophe events described above were derived from ground-up assessments of our in-force contracts and treaties providing coverage in the affected regions. These assessments take into account the latest information available from clients, brokers and loss adjusters. In addition, we consider industry insured loss estimates, market share analyses and catastrophe modeling analyses, when appropriate. Our estimates remain subject to change, as additional loss data becomes available.

We continue to monitor paid and incurred loss development for catastrophe events of prior years and update our estimates of ultimate losses accordingly.

Prior Year Reserve Development:

Our favorable prior year reserve development was the net result of several underlying reserve developments on prior accident years, identified during our quarterly reserve review process. The following table provides a breakdown of prior year reserve development by segment:

	Three months ended March 31,
	2018		2017
Insurance	$	22,775	$	7,865
Reinsurance	31,532		16,928
Total	$	54,307	$	24,793

Overview

Short-tail business

Our short tail business includes the underlying exposures in our property and other, marine and aviation reserve classes within our insurance segment, and our property and other reserve class within our reinsurance segment.

These reserve classes contributed $38 million and $4 million of net favorable prior year reserve development for the three months endedMarch 31, 2018 and March 31, 2017, respectively, and primarily reflected the recognition of better than expected loss emergence.

Medium-tail business

Our medium-tail business consists primarily of insurance and reinsurance professional reserve classes, credit and political risk insurance reserve class and credit and surety reinsurance reserve class.

Our reinsurance professional reserve class recognized $9 million and $16 million of net favorable prior year development for the three months endedMarch 31, 2018 and March 31, 2017, respectively. The net favorable prior year loss development on this reserve class continued to reflect the generally favorable experience on earlier accident years as we continued to transition to more experienced based methods.

Our insurance professional reserve class recognized net favorable prior year development of $4 million and $7 million for the three months endedMarch 31, 2018 and March 31, 2017, respectively. The net favorable prior year loss development on this reserve class reflected the generally favorable experience on earlier accident years as we transition to more experienced based methods.

Our credit and surety reinsurance reserve class recorded net favorable prior year reserve development of $5 million and $nil for the three months endedMarch 31, 2018 and March 31, 2017, respectively due to the recognition of generally better than expected loss emergence.

Long-tail business

Our long-tail business consists primarily of liability and motor reserve classes.

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Our reinsurance liability reserve class contributed net favorable prior year reserve development of $2 million and $24 million for the three months endedMarch 31, 2018 and March 31, 2017, respectively. The net favorable prior year reserve development for the three months endedMarch 31, 2017 primarily reflected the progressively increased weight given by management to experience based indications on older accident years, which has generally been favorable.

Our motor reinsurance reserve classes contributed net favorable prior year reserve development of $3 million and net adverse prior year reserve development of $22 million for the three months endedMarch 31, 2018 and March 31, 2017, respectively. The net adverse prior year reserve development for the three months endedMarch 31, 2017 was primarily due to the decrease in the discount rate used to calculate lump sum awards in U.K. bodily injury cases, known as the Ogden Rate which changed from plus 2.5% to minus 0.75% effective March 20, 2017.

Our insurance liability reserve class recorded net adverse prior year development of $7 million and $4 million for the three months endedMarch 31, 2018 and March 31, 2017, respectively, primarily related to reserve strengthening within our U.S. excess casualty business reflecting slightly higher than expected prior year emerging loss experience.

We caution that conditions and trends that impacted the development of our liabilities in the past may not necessarily occur in the future.

The following tables reconcile reserve classes to the lines of business categories and the expected claim tails:

Insurance Segment
		Reported Lines of Business
Reserve Classes	Tail	Property	Marine	Terrorism	Aviation	Credit and Political Risk	Professional Lines	Liability	Accident and Health	Discontinued lines - Novae
Property and Other	Short	X		X					X	X
Marine	Short		X
Aviation	Short				X
Credit and Political Risk	Medium					X
Professional Lines	Medium						X			X
Liability	Long							X		X

Reinsurance Segment

Reported Lines of Business

Reserve Classes

Tail

Catastrophe

Property

Credit and Surety

Professional Lines

Motor

Liability

Engineering

Agriculture

Marine and Other

Accident and Health

Discontinued lines - Novae

Property and Other

Short

X

X

X

X

X

X

X

Credit and Surety

Medium

X

Professional Lines

Medium

X

Motor

Long

X

X

Liability

Long

X

X

The following sections provide further details on prior year reserve development by segment, reserving class and accident year.

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Insurance Segment:

	Three months ended March 31,
	2018			2017
Property and other	$	17,188		$	(218	)
Marine	11,272			6,088
Aviation	(3,692		)	(1,545		)
Credit and political risk	765			(17		)
Professional lines	3,907			7,450
Liability	(6,665		)	(3,894		)
Total	$	22,775		$	7,865

For the three months endedMarch 31, 2018 we recognized $23 million of net favorable prior year reserve development, the principal component of which was: 

• $17 million of net favorable prior year reserve development on property and other business, primarily due to generally better than expected loss emergence related to the 2017 catastrophe events.

• $11 million of net favorable prior year reserve development on marine business, due to better than expected loss emergence on recent accident years.

• $7 million of net adverse prior year reserve development on liability business due to reserve strengthening within our U.S. excess casualty book of business mainly driven by a higher frequency of large auto and general liability claims primarily related to 2015 and 2017 accident years.

For the three months endedMarch 31, 2017 we recognized $8 million of net favorable prior year reserve development, the principal components of which were: 

• $7 million of net favorable prior year reserve development on professional lines, driven by better than expected development related to accident year 2014.

• $6 million of net favorable prior year reserve development on marine business, driven by better than expected loss emergence impacting accident years 2014 and 2015.

• $4 million of net adverse prior year development on liability lines, primarily related to reserve strengthening in recent years.

Reinsurance Segment:

	Three months ended March 31,
	2018		2017
Property and other	$	13,087	$	(825	)
Credit and surety	4,986		(86		)
Professional lines	8,573		15,925
Motor	3,191		(22,156		)
Liability	1,695		24,070
Total	$	31,532	$	16,928

For the three months endedMarch 31, 2018 we recognized $32 million of net favorable prior year reserve development, the principal components of which were:

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• $13 million of net favorable prior year reserve development on property and other business, due to overall better than expected loss emergence related to the 2017 catastrophe events and better than expected loss emergence on our agriculture business.

• $9 million of net favorable prior year reserve development on professional lines business, reflecting the generally favorable experience on earlier accident years, particularly 2010 through 2011, as we continue to transition to more experience based methods.

• $5 million of net favorable prior year reserve development on credit and surety, due to better than expected loss emergence primarily related to accident years 2012 through 2015.

For the three months endedMarch 31, 2017 we recognized $17 million of net favorable prior year reserve development, the principal components of which were:

• $24 million of net favorable prior year reserve development on liability business, primarily related to the 2006 through 2011 accident years, for reasons discussed in the overview.

• $16 million of net favorable prior year reserve development on professional lines business, related to earlier accident years, for reasons discussed in the overview.

• $22 million of net adverse prior year reserve development on motor business, related to the impact of the Ogden Rate change, partially offset by continued better than expected loss emergence related to non-proportional business spanning multiple accident years.

Acquisition Cost Ratio:

The acquisition cost ratio decreased to 19.6% for the three months endedMarch 31, 2018 from 20.2% for the three months endedMarch 31, 2017 driven by our reinsurance segment primarily as a result of changes in business mix. This decrease was partially offset by an increase in our insurance segment primarily attributable to the acquisition of Novae and changes in business mix.

General and Administrative Expense Ratio:

The general and administrative expense ratio decreased to 14.5% for the three months endedMarch 31, 2018 from 17.2% for the three months endedMarch 31, 2017. The decrease was driven by both segments primarily due to a decrease in personnel costs, partially offset by Novae general and administrative expenses.

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RESULTS BY SEGMENT

Insurance Segment

Results from our insurance segment were as follows:

	Three months ended March 31,
	2018			% Change	2017
Revenues:
Gross premiums written	$	880,848		62%	$	545,261
Net premiums written	547,893			54%	356,836
Net premiums earned	580,059			48%	391,964
Other insurance related income	620			nm	42
Expenses:
Current year net losses and loss expenses	(344,313		)		(248,950		)
Prior year reserve development	22,775				7,865
Acquisition costs	(87,329		)		(54,004		)
General and administrative expenses	(102,370		)		(85,256		)
Underwriting income	$	69,442		nm	$	11,661
Ratios:				% Point Change
Current accident year loss ratio	59.4		%	(4.1)	63.5		%
Prior year reserve development	(4.0		%)	(2.0)	(2.0		%)
Acquisition cost ratio	15.1		%	1.3	13.8		%
General and administrative expense ratio	17.6		%	(4.2)	21.8		%
Combined ratio	88.1		%	(8.9)	97.0		%

nm – not meaningful

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Gross Premiums Written:

The following table provides gross premiums written by line of business:

	Three months ended March 31,
	2018				2017				% Change
Property	$	295,206	34	%	$	144,564	25	%	104%
Marine	126,743		14	%	65,601		12	%	93%
Terrorism	16,900		2	%	11,814		2	%	43%
Aviation	21,013		2	%	14,583		3	%	44%
Credit and Political Risk	44,731		5	%	16,172		3	%	nm
Professional Lines	207,965		24	%	155,469		29	%	34%
Liability	105,661		12	%	90,603		17	%	17%
Accident and Health	60,674		7	%	46,455		9	%	31%
Discontinued Lines	1,955		—%		—		—	%	nm
Total	$	880,848	100	%	$	545,261	100	%	62%

nm – not meaningful

Gross premiums written for the three months endedMarch 31, 2018 increased by $336 million or 62% compared to the three months endedMarch 31, 2017. The increase in gross premiums written included $302 million attributable to property, marine, professional lines, and credit and political risk lines associated with our acquisition of Novae. In addition, gross premiums written increased by $34 million, or 6% ($28 million or 5% on a constant currency basis) for three months endedMarch 31, 2018 compared to the same period in 2017, attributable to our professional lines, liability, and accident and health lines driven by new business opportunities, together with an increase in our aviation lines associated with our acquisition of Aviabel which was completed last year.

Ceded Premiums Written:

Ceded premiums written for the three months endedMarch 31, 2018 were $333 million or 38% of gross premiums written compared to $188 million or 35% of gross premiums written for the three months endedMarch 31, 2017. The increase in ceded premiums written included $117 million primarily attributable to property, professional lines and marine lines associated with our acquisition of Novae. In addition, ceded premiums increased by $27 million or 14% for the three months endedMarch 31, 2018, compared to the same period in 2017, primarily driven by our professional lines and liability lines.

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Net Premiums Earned:

The following table provides net premiums earned by line of business:

	Three months ended March 31,
	2018				2017				% Change
Property	$	196,613	34	%	$	118,875	29	%	65%
Marine	76,376		13	%	38,669		10	%	98%
Terrorism	14,507		3	%	7,938		2	%	83%
Aviation	18,488		3	%	10,847		3	%	70%
Credit and Political Risk	27,721		5	%	10,180		3	%	nm
Professional Lines	135,612		23	%	125,138		32	%	8%
Liability	51,096		9	%	42,773		11	%	19%
Accident and Health	48,578		8	%	37,544		10	%	29%
Discontinued Lines	11,068		2	%	—		—	%	nm
Total	$	580,059	100	%	$	391,964	100	%	48%

nm - not meaningful

Net premiums earned for the three months endedMarch 31, 2018 increased by $188 million or 48% compared to the three months endedMarch 31, 2017. The increase in net premiums earned included $178 million primarily attributable to property, marine, and accident and health lines associated with our acquisition of Novae. In addition, net premiums earned increased by $10 million, or 3% (2% on a constant currency basis) driven by strong premium growth in our accident and health lines in recent periods, together with premium growth in our aviation lines associated with the acquisition of Aviabel completed last year.

Loss Ratio:

The table below shows the components of our loss ratio:

	Three months ended March 31,
	2018		% Point Change	2017
Current accident year	59.4	%	(4.1)	63.5	%
Prior year reserve development	(4.0	%)	(2.0)	(2.0	%)
Loss ratio	55.4	%	(6.1)	61.5	%

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Current Accident Year Loss Ratio:

The current accident year loss ratios decreased to 59.4% for the three months endedMarch 31, 2018 from 63.5% for the three months endedMarch 31, 2017.

The decrease in the current accident year loss ratio for the three months endedMarch 31, 2018 compared to the same period in 2017, was impacted by a lower level of catastrophe and weather-related losses. During the three months endedMarch 31, 2018 we incurred $28 million, or 4.9 points, in pre-tax catastrophe and weather-related losses, primarily attributable to the Papua New Guinea earthquake and U.S. and European weather-related events. Comparatively, during the three months endedMarch 31, 2017, we incurred $20 million or 5.1 points in pre-tax catastrophe and weather-related losses.

After adjusting for the impact of the catastrophe and weather-related losses, our current accident year loss ratio for the three months endedMarch 31, 2018 was 54.5% compared to 58.4% for the three months endedMarch 31, 2017. The decrease in the current accident year loss ratio after adjusting for the impact of the catastrophe and weather-related losses for the three months endedMarch 31, 2018 compared to the same period in 2017, was principally due to changes in business mix, together with favorable impact of rate and trend, partially offset by an increase in attritional loss experience in our aviation lines.

Refer to the ‘Prior Year Reserve Development’ section for further details.

Acquisition Cost Ratio:

The acquisition cost ratio increased to 15.1% for the three months endedMarch 31, 2018 from 13.8% for the three months endedMarch 31, 2017 primarily attributable to changes in business mix.

General and Administrative Expense Ratio:

The general and administrative expense ratio decreased to 17.6% for the three months endedMarch 31, 2018, from 21.8% for the three months endedMarch 31, 2017 reflecting a decrease in personnel costs, partially offset by general and administrative expenses associated with the acquisition of Novae.

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Reinsurance Segment

Results from our reinsurance segment were as follows:

	Three months ended March 31,
	2018			% Change	2017
Revenues:
Gross premiums written	$	1,781,947		30%	$	1,366,610
Net premiums written	1,437,978			25%	1,152,122
Net premiums earned	587,343			7%	546,739
Other insurance related income (losses)	5,986			nm	(3,825		)
Expenses:
Current year net losses and loss expenses	(371,339		)		(382,785		)
Prior year reserve development	31,532				16,928
Acquisition costs	(141,931		)		(135,788		)
General and administrative expenses	(37,296		)		(36,545		)
Underwriting income	$	74,295		nm	$	4,724
Ratios:				% Point Change
Current accident year loss ratio	63.2		%	(6.8)	70.0		%
Prior year reserve development	(5.3		%)	(2.2)	(3.1		%)
Acquisition cost ratio	24.2		%	(0.6)	24.8		%
General and administrative expense ratio	6.3		%	(0.4)	6.7		%
Combined ratio	88.4		%	(10.0)	98.4		%

nm – not meaningful

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Gross Premiums Written:

The following table provides gross premiums written by line of business for the periods indicated:

	Three months ended March 31,
	2018					2017				%  Change
Catastrophe	$	281,883		17	%	$	185,935	14	%	52%
Property	200,707			11	%	194,541		14	%	3%
Professional Lines	106,178			6	%	77,012		6	%	38%
Credit and Surety	196,316			11	%	119,925		9	%	64%
Motor	412,077			23	%	291,423		21	%	41%
Liability	159,009			9	%	111,821		8	%	42%
Agriculture	145,397			8	%	149,191		11	%	(3%)
Engineering	26,506			1	%	40,533		3	%	(35%)
Marine and Other	26,647			1	%	47,483		3	%	(44%)
Accident and Health	227,689			13	%	148,746		11	%	53%
Discontinued Lines	(462		)	—	%	—		—	%	nm
Total	$	1,781,947		100	%	$	1,366,610	100	%	30%

nm – not meaningful

Gross premiums written increased by $415 million, or 30%, for the three months endedMarch 31, 2018 compared to the same period in 2017. The increase included $50 million attributable to catastrophe, marine and aviation lines associated with the acquisition of Novae. In addition, gross premiums written increased by $365 million, or 27% ($286 million or 21% on a constant currency basis) for the three months ended March 31, 2018, compared to the same period of in 2017, driven by our motor, accident and health, credit and surety, catastrophe, liability and professional lines, partially offset by a decrease in marine and other lines. The increase in our motor and credit and surety lines was due to restructuring of large quota share treaties which affected the timing of premium recognition, together with impact of foreign exchange movements as the weakening of the U.S. dollar drove comparative premium increases in treaties denominated in foreign currencies. In addition, the increase in our motor lines was attributable to rate increases in U.K. non-proportional motor business following the reduction in the Ogden Rate during the first quarter of 2017 together with new business. The increase in our accident and health and catastrophe lines was due to new business. Increased line sizes on a number of treaties also contributed to the increase in catastrophe lines. The increase in liability and professional lines was largely due to timing differences. These increases were partially offset by a decrease in marine and other due to the non-renewal of a large treaty.

Ceded Premiums Written:

Ceded premiums written for the three months endedMarch 31, 2018 were $344 million or 19% of gross premiums written compared to $214 million or 16% of gross premiums written for the three months endedMarch 31, 2017, respectively. The increase in ceded premiums written for the three months endedMarch 31, 2018 included $31 million attributable to catastrophe and marine lines associated with the acquisition of Novae. In addition, ceded premiums written increased by $98 million, or 46% for the three months endedMarch 31, 2018 compared to the same period in 2017, attributable to our catastrophe, credit and surety, and accident and health, liability and professional lines primarily due to an increase in premiums ceded to our strategic capital partners in our catastrophe lines together with an increase in premiums ceded to new quota share retrocessional treaties which cover our credit and surety, accident and health, liability and professional lines.

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Net Premiums Earned:

The following table provides net premiums earned by line of business:

	Three months ended March 31,
	2018				2017				% Change
Catastrophe	$	61,854	10	%	$	41,520	7	%	49%
Property	78,456		13	%	74,272		14	%	6%
Professional Lines	56,190		10	%	59,897		11	%	(6%)
Credit and Surety	52,736		9	%	56,049		10	%	(6%)
Motor	103,533		18	%	87,465		16	%	18%
Liability	89,592		15	%	80,833		15	%	11%
Agriculture	38,559		7	%	52,796		10	%	(27%)
Engineering	17,705		3	%	14,273		3	%	24%
Marine and Other	6,457		1	%	13,167		2	%	(51%)
Accident and Health	78,558		13	%	66,467		12	%	18%
Discontinued Lines	3,703		1	%	—		—	%	nm
Total	$	587,343	100	%	$	546,739	100	%	7%

nm – not meaningful

Net premiums earned increased by $41 million or 7% for the three months endedMarch 31, 2018, compared to the same periods in 2017. The increase in net premiums earned included $13 million primarily attributable to marine and catastrophe lines associated with our acquisition of Novae. In addition, net premiums earned increased by $27 million, or 5% (4% on a constant currency basis) for the three months endedMarch 31, 2018 compared to the same period in 2017, driven by strong premium growth in our catastrophe, motor, and accident and health lines partially offset by an increase in ceded premiums earned in our catastrophe lines.

Other Insurance Related Income (Losses):

Other insurance related income was $6 million for the three months endedMarch 31, 2018, compared to other insurance related loss of $4 million for the same period in 2017. The increase of $10 million for the three months endedMarch 31, 2018 compared to the same period in 2017, reflected a decrease in realized losses and unfavorable mark-to-market adjustments related to our weather and commodities derivative business which we no longer write, partially offset by favorable mark-to-market adjustments related to other insurance and reinsurance contracts accounted for as derivatives and an increase in fees from strategic capital partners.

Loss Ratio:

The table below shows the components of our loss ratio:

	Three months ended March 31,
	2018		% Point Change	2017
Current accident year	63.2	%	(6.8)	70.0	%
Prior year reserve development	(5.3	%)	(2.2)	(3.1	%)
Loss ratio	57.9	%	(9.0)	66.9	%

Current Accident Year Loss Ratio:

The current accident year loss ratio decreased to 63.2% for the three months endedMarch 31, 2018 from 70.0% for the three months endedMarch 31, 2017, respectively.

The decrease in the current accident year loss ratios for the three months endedMarch 31, 2018 compared to the same period in 2017, was impacted by a lower level of catastrophe and weather-related losses. During the three months endedMarch 31, 2018, we incurred

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pre-tax catastrophe and weather-related losses of $7 million or 1.1 points attributable to Windstorm Friederike and U.S. weather-related events. Comparatively, during the three months endedMarch 31, 2017 we incurred pre-tax catastrophe and weather-related losses of $15 million, or 2.8 points.

After adjusting for the impact of the catastrophe and weather-related losses, our current accident year loss ratio for the three months endedMarch 31, 2018 was 62.1% compared to 67.2% for the three months endedMarch 31, 2017. The decrease in the current accident year loss ratio after adjusting for the impact of the catastrophe and weather-related losses for the three months endedMarch 31, 2018 compared to the same period in 2017, was principally due to changes in business mix, a decrease in mid-size loss experience together with the impact of rate increases in U.K. non-proportional motor business following the reduction in the Ogden Rate during the first quarter of 2017.

Refer ‘Prior Year Reserve Development’ for further details. 

Acquisition Cost Ratio:

The acquisition cost ratio decreased to 24.2% for the three months endedMarch 31, 2018 compared to 24.8% for the three months endedMarch 31, 2017 primarily attributable to changes in business mix..

General and Administrative Expense Ratio:

The general and administrative expense ratio decreased to 6.3% for the three months endedMarch 31, 2018 from 6.7% for the three months endedMarch 31, 2017 reflecting a decrease personnel costs, partially offset by general and administrative expenses associated with the acquisition of Novae.

OTHER EXPENSES (REVENUES), NET

The following table provides a breakdown of our other expenses (revenues), net:

	Three months ended March 31,
	2018			% Change	2017
Corporate expenses	$	30,171		(24%)	$	39,459
Foreign exchange losses	37,860			76%	21,465
Interest expense and financing costs	16,763			31%	12,791
Income tax benefit	(1,036		)	nm	(9,337		)
Total	$	83,758		30%	$	64,378

nm – not meaningful

Corporate Expenses

Our corporate expenses include holding company costs necessary to support our worldwide insurance and reinsurance operations and costs associated with operating as a publicly-traded company. As a percentage of net premiums earned, corporate expenses were 2.6% for the three months endedMarch 31, 2018, compared to 4.2% for the same period in 2017.

The decrease in corporate expenses for the three months endedMarch 31, 2018 was primarily attributable to a decrease in personnel costs and executive transition costs, together with an increase in the allocation of corporate costs to our insurance and reinsurance segments, partially offset by an increase in information technology costs.

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Foreign Exchange Losses (Gains)

Some of our business is written in currencies other than the U.S. dollar. Foreign exchange losses of $38 million for the three months endedMarch 31, 2018 were primarily attributable to the impact of the weakening of the U.S. dollar on the remeasurement of net insurance-related liabilities mainly denominated in pound sterling and euro.

The foreign exchange losses of $21 million for the three months endedMarch 31, 2017 were attributable to the reclass of a cumulative translation adjustment balance of $24 million related to AXIS Specialty Australia from accumulated other comprehensive income to foreign exchange losses as the wind-down of this operation was substantially complete as of March 31, 2017. This loss was partially offset by foreign exchange gains related to the strengthening of the pound sterling and the euro against the U.S. dollar which positively impacted the remeasurement of premium receivable balances.

Interest Expense and Financing Costs

Interest expense and financing costs are related to interest due on 5.875% Senior Notes issued in 2010, 2.65% Senior Notes and the 5.15% Senior Notes issued in 2014, and 4.0% Senior Notes issued in 2017, as well as Dekania Notes issued by Novae in 2004. Interest expenses and financing costs increased by $4 million for the three months endedMarch 31, 2018 compared to the same period in 2017, primarily attributable to costs associated with the 4.0% Senior Notes and Dekania Notes.

Income Tax Expense (Benefit)

Income tax expense (benefit) primarily results from income (loss) generated by our foreign operations in the U.S. and Europe. Our effective tax rate is calculated as income tax expense (benefit) divided by net income (loss) before tax including interest in income (loss) of equity method investments. This effective rate can vary between periods depending on the distribution of net income (loss) amongst tax jurisdictions, as well as other factors.

The tax benefit of $1 million recognized for the three months endedMarch 31, 2018 was primarily driven by the generation of pre-tax losses in our U.K. operations, largely offset by the generation of pre-tax income in our U.S. operations.

The tax benefit of $9 million recognized for the three months endedMarch 31, 2017 was primarily attributable to share based compensation excess tax benefits recognized in the income statement due to the adoption of Accounting Standards Update ("ASU") ASU 2016-09, "Compensation-Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting", as well as underwriting losses recognized in our U.S. and European operations.

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NET INVESTMENT INCOME AND NET INVESTMENT GAINS (LOSSES)

Net Investment Income

The following table provides a breakdown of income earned from our cash and investment portfolio by major asset class:

	Three months ended March 31,
	2018			% Change	2017
Fixed maturities	$	83,958		8%	$	77,407
Other investments	13,704			(28%)	18,962
Equity securities	1,758			(49%)	3,478
Mortgage loans	3,125			26%	2,477
Cash and cash equivalents	4,153			34%	3,095
Short-term investments	875			100%	438
Gross investment income	107,573			2%	105,857
Investment expense	(6,574		)	(9%)	(7,193		)
Net investment income	$	100,999		2%	$	98,664
Pre-tax yield:(1)
Fixed maturities	2.7		%		2.7		%

nm - not meaningful

(1) Pre-tax yield is annualized and calculated as net investment income divided by the average month-end amortized cost balances for the periods indicated.

Fixed Maturities

Net investment income attributable to fixed maturities for the three months ended March 31, 2018 was $84 million compared to net investment income of $77 million for the three months ended March 31, 2017, an increase of $7 million. The increase was due to our acquisitions of Novae and Aviabel.

Other Investments

The following table provides a breakdown of total net investment income from other investments:

	Three months ended March 31,
	2018			2017
Hedge, direct lending, private equity and real estate funds	$	10,589		$	16,946
Other privately held investments	1,499			987
CLO-Equities	1,616			1,029
Total net investment income from other investments	$	13,704		$	18,962
Pre-tax return on other investments(1)	1.7		%	2.4		%

(1) The pre-tax return on other investments is non-annualized and calculated by dividing total net investment income from other investments by the average month-end fair value balances held for the periods indicated.

Net investment income attributable to other investments was $14 million for the three months ended March 31, 2018, compared to net investment income of $19 million for the three months ended March 31, 2017, a decrease of $5 million. The decrease was due to lower returns from hedge funds as a result of the weaker performance of global equity markets.

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Net Investment Losses

The following table provides a breakdown of net investment losses:

	Three months ended March 31,
	2018			2017
On sale of investments:
Fixed maturities and short-term investments	$	(11,907	)	$	(32,158	)
Equity securities	16,281			15,594
	4,374			(16,564		)
OTTI charges recognized in net income	(414		)	(6,553		)
Change in fair value of investment derivatives	2,023			(1,933		)
Net unrealized gains (losses) on equity securities	(20,813		)	—
Net investment losses	$	(14,830	)	$	(25,050	)

On Sale of Investments

Generally, sales of individual securities occur when there are changes in the relative value, credit quality or duration of a particular issue. We may also sell securities to re-balance our investment portfolio in order to change exposure to particular asset classes or sectors.

Net investment losses for the three months endedMarch 31, 2018 were $15 million compared to net investment losses of $25 million for the three months endedMarch 31, 2017, a decrease of $10 million. For the three months ended March 31, 2018, net investment losses were primarily due to the adoption of ASU 2016-01 which resulted in net unrealized investment losses on equity securities of $21 million being reported in net investment losses as opposed to other comprehensive income. For the three months ended March 31, 2017, the net investment losses were primarily due to foreign exchange losses on non-U.S. denominated securities, as a result of the strengthening of the U.S. dollar.

OTTI Charges

The OTTI charges for the three months endedMarch 31, 2018 were $0.4 million compared to $7 million for the three months endedMarch 31, 2017, a decrease of over $6 million. For the three months ended March 31, 2018, the OTTI charges were driven by impairments on corporate debt securities. For the three months ended March 31, 2017, the OTTI charges were driven by impairments on corporate debt securities and losses on non-U.S. denominated securities due of the decline in foreign exchange rates against the U.S. dollar.

Change in Fair Value of Investment Derivatives

From time to time, we economically hedge foreign exchange exposure of non-U.S. denominated securities by entering into foreign exchange forward contracts.

During 2017, we introduced the use of interest rate swaps to reduce duration risk of our fixed income portfolio.

For the three months endedMarch 31, 2018, we recorded losses of $1 million relating to foreign exchange contracts and gains of $3 million relating to interest rates swaps. For the three months ended March 31, 2017, we recorded losses of $2 million relating to foreign exchange contracts and gains of less than $1 million relating to interest rates swaps.

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Total Return

The following table provides a breakdown of the total return on cash and investments for the period indicated:

	Three months ended March 31,
	2018			2017
Net investment income	$	100,999		$	98,664
Net investments losses	(14,830		)	(25,050		)
Change in net unrealized gains (losses)(1)	(107,265		)	96,131
Interest in loss of equity method investments	—			(5,766		)
Total	$	(21,096	)	$	163,979
Average cash and investments(2)	$	15,679,134		$	14,632,701
Total return on average cash and investments, pre-tax:
Inclusive of investment related foreign exchange movements	(0.1		%)	1.1		%
Exclusive of investment related foreign exchange movements(3)	(0.4		%)	1.0		%

(1) Change in net unrealized gains (losses) is calculated by taking net unrealized gains (losses) at period end less net unrealized gains (losses) at the prior period end.

(2) The average cash and investments balance is calculated by taking the average of the month-end fair value balances held for the periods indicated.

(3) Pre-tax return on cash and investments excluding foreign exchange movements is a non-GAAP financial measure as defined in SEC Regulation S-K. The reconciliation to pre-tax total return on cash and investments, the most comparable GAAP financial measure included foreign exchange gains of $40 million and $12 million for the three months ended March 31, 2018 and 2017, respectively.

CASH AND INVESTMENTS

The table below provides a breakdown of our cash and investments:

	March 31, 2018			December 31, 2017
		Fair Value			Fair Value
Fixed maturities		$	11,801,396		$	12,622,006
Equity securities		435,742			635,511
Mortgage loans		364,769			325,062
Other investments		1,009,587			1,009,373
Equity method investments		108,597			108,597
Short-term investments		56,246			83,661
Total investments		$	13,776,337		$	14,784,210
Cash and cash equivalents(1)		$	1,644,580		$	1,363,786

(1) Includes restricted cash and cash equivalents of $417 million and $415 million at March 31, 2018 and at December 31, 2017, respectively.

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Overview

The fair value of total investments decreased by $1 billion for the three months ended March 31,2018, driven by the settlement of the RITC agreement of the 2015 and prior years of account of Syndicate 2007, funding of operating activities and the decline in market value of fixed maturities due to the rise in U.S. Treasury rates.

The following provides a further analysis on our investment portfolio by asset classes:

Fixed Maturities

The following provides a breakdown of our investment in fixed maturities:

	March 31, 2018				December 31, 2017
	Fair Value		% of Total		Fair Value		% of Total
Fixed maturities:
U.S. government and agency	$	1,796,965	15	%	$	1,712,469	14	%
Non-U.S. government	661,224		6	%	806,299		6	%
Corporate debt	4,640,431		39	%	5,297,866		43	%
Agency RMBS	1,914,845		16	%	2,395,152		19	%
CMBS	1,030,621		9	%	777,728		6	%
Non-Agency RMBS	41,397		1	%	46,831		—	%
ABS	1,566,698		13	%	1,436,281		11	%
Municipals(1)	149,215		1	%	149,380		1	%
Total	$	11,801,396	100	%	$	12,622,006	100	%
Credit ratings:
U.S. government and agency	$	1,796,965	15	%	$	1,712,469	14	%
AAA(2)	4,745,363		40	%	4,990,848		39	%
AA	879,762		7	%	1,050,631		8	%
A	1,761,064		15	%	2,090,632		17	%
BBB	1,634,628		14	%	1,758,291		14	%
Below BBB(3)	983,614		9	%	1,019,135		8	%
Total	$	11,801,396	100	%	$	12,622,006	100	%

(1) Includes bonds issued by states, municipalities, and political subdivisions.

(2) Includes U.S. government-sponsored agency Residential mortgage-backed securities ("RMBS") and Commercial mortgage-backed securities ("CMBS").

(3) Non-investment grade and non-rated securities.

At March 31,2018, fixed maturities had a weighted average credit rating of AA- (2017: AA-) and an average duration of 3.2 years (2017: 3.3 years), and a duration inclusive of interest rate swaps of 3.1 years (2017: 3.2 years). At March 31,2018, inclusive of short-term investments and cash and cash equivalents, the average credit rating was AA- (2017: AA-) and duration inclusive of interest rate swaps was 2.8 years (2017: 2.9 years).

At March 31, 2018, net unrealized investment losses on fixed maturities were $97 million, compared to net unrealized investment gains of $11 million at December 31, 2017, a decrease of $108 million due to the rise in U.S. Treasury rates.

Equity Securities

At March 31, 2018, net unrealized investment gains on equity securities were $62 million, compared to $83 million at December 31, 2017, a decrease of $21 million driven by sales of equity securities.

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Mortgage Loans

During the three months ended March 31, 2018, our investment in commercial mortgage loans increased by $40 million. The commercial mortgage loans are high quality and collateralized by a variety of commercial properties and are diversified both geographically throughout the U.S. and by property type to reduce the risk of concentration. At March 31, 2018, there were no credit losses associated with our commercial mortgage loans portfolio.

Other Investments

The composition of our other investments portfolio is summarized as follows:

	March 31, 2018				December 31, 2017
Hedge funds
Long/short equity funds	$	25,489	3	%	$	38,470	4	%
Multi-strategy funds	283,298		28	%	286,164		28	%
Event-driven funds	37,680		4	%	39,177		4	%
Total hedge funds	346,467		35	%	363,811		36	%
Direct lending funds	261,902		26	%	250,681		25	%
Private equity funds	65,811		7	%	68,812		7	%
Real estate funds	54,720		5	%	50,009		5	%
Total hedge, direct lending, private equity and real estate funds	728,900		73	%	733,313		73	%
Other privately held investments	48,787		5	%	46,430		5	%
CLO-Equities	28,556		2	%	31,413		2	%
Overseas deposits	203,344		20	%	198,217		20	%
Total other investments	$	1,009,587	100	%	$	1,009,373	100	%

During the three month period ended March 31, 2018, the fair value of total hedge funds decreased by $17 million driven by $20 million of net redemptions offset by $3 million of price appreciation. Certain of these funds may be subject to restrictions on redemptions which may limit our ability to liquidate these investments in the short term. See Note 3(c) to the Consolidated Financial Statements 'Investments' for further details on these restrictions and details on unfunded commitments relating to our other investment portfolio.

Overseas deposits include investments in private funds held by Syndicate 2007 where the underlying investments are primarily U.S. government, non-U.S. government and corporate debt securities. The funds do not trade on an exchange therefore are not included within the available for sale investments category.

Equity Method Investments

During 2016, we paid $108 million including direct transactions costs to acquire 19% of the common equity of Harrington Reinsurance Holdings Limited ("Harrington"), the parent company of Harrington Re Ltd. ("Harrington Re"), an independent reinsurance company jointly sponsored by AXIS Capital and The Blackstone Group L.P. ("Blackstone"). Harrington is not a variable interest entity. Given that we exercise significant influence over this investee we account for our ownership in Harrington under the equity method of accounting.

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LIQUIDITY AND CAPITAL RESOURCES

Refer to the ‘Liquidity and Capital Resources’ section included under Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2017 for a general discussion of our liquidity and capital resources. The following table summarizes our consolidated capital at:

	March 31, 2018			December 31, 2017
Debt	$	1,376,835		$	1,376,529
Preferred shares	775,000			775,000
Common equity	4,489,395			4,566,264
Shareholders’ equity	5,264,395			5,341,264
Total capital	$	6,641,230		$	6,717,793
Ratio of debt to total capital	20.7		%	20.5		%
Ratio of debt and preferred equity to total capital	32.4		%	32.0		%

We finance our operations with a combination of debt and equity capital. Our debt to total capital and debt and preferred equity to total capital ratios provide an indication of our capital structure, along with some insight into our financial strength.

We believe that our financial flexibility remains strong.

Secured Letter of Credit Facility

On March 28, 2018, certain of AXIS Capital’s operating subsidiaries (the "Participating Subsidiaries") amended their existing $250 million secured letter of credit facility with Citibank Europe plc (the "$250 Million Facility") under their aggregate $750 million secured letter of credit facility with Citibank Europe plc (the "$750 Million Facility") to extend the expiration date to March 31, 2019.

The terms and conditions of the additional $500 million secured letter of credit facility under the $750 Million Facility remain unchanged. The $500 million secured letter of credit facility expires December 31, 2019. 

Letters of credit issued under the $750 Million Facility will principally be used to support the reinsurance obligations of the Participating Subsidiaries. The Participating Subsidiaries are subject to certain covenants, including the requirement to maintain sufficient collateral to cover the obligations outstanding under the $750 Million Facility. In the event of default, Citibank may exercise certain remedies, including the exercise of control over pledged collateral and the termination of the availability of the $750 Million Facility to any or all of the Participating Subsidiaries.

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Common Equity

During the three months endedMarch 31, 2018, our common equity decreased by $79 million. The following table reconciles our opening and closing common equity positions:

Three months ended March 31,	2018
Common equity - opening	$	4,566,264
Treasury shares reissued	1,661
Share-based compensation expense	9,603
Change in unrealized appreciation on available for sale investments, net of tax	(111,406		)
Foreign currency translation adjustment	1,270
Net income	73,202
Preferred share dividends	(10,656		)
Common share dividends	(33,380		)
Treasury shares repurchased	(7,163		)
Common equity - closing	$	4,489,395

During the three months endedMarch 31, 2018, we repurchased 0.1 million common shares for a total of $7 million in connection with the vesting of restricted stock awards granted under our 2007 Long-Term Equity Compensation Plan.

Following the Company's announcement of the offer to acquire Novae on July 5, 2017, the Company suspended its open market share repurchase program. On December 31, 2017, authorization under the Board-authorized share repurchase plan for common share repurchases through 2017 expired. A common share repurchase plan has not been authorized for 2018.

We continue to expect that cash flows generated from our operations, combined with the liquidity provided by our investment portfolio, will be sufficient to cover our required cash outflows and other contractual commitments through the foreseeable future.

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CRITICAL ACCOUNTING ESTIMATES

Our Consolidated Financial Statements include certain amounts that are inherently uncertain and judgmental in nature. As a result, we are required to make assumptions and best estimates in order to determine the reported values. We consider an accounting estimate to be critical if: (1) it requires that significant assumptions be made in order to deal with uncertainties and (2) changes in the estimate could have a material impact on our results of operations, financial condition or liquidity.

As disclosed in our 2017 Annual Report on Form 10-K, we believe that the material items requiring such subjective and complex estimates are our:

• reserves for losses and loss expenses;

• reinsurance recoverable balances;

• premiums;

• fair value measurements for our financial assets and liabilities; and

• assessments of other-than-temporary impairments.

We believe that the critical accounting estimates discussion in Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2017, continues to describe the significant estimates and judgments included in the preparation of our Consolidated Financial Statements.

RECENT ACCOUNTING PRONOUNCEMENTS

Refer to Item 1, Note 1 'Basis of Presentation and Significant Accounting Policies' to the Consolidated Financial Statements and Item 8, Note 2 'Significant Accounting Policies' to the Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2017, for a discussion of recently issued accounting pronouncements.

OFF-BALANCE SHEET AND SPECIAL PURPOSE ENTITY ARRANGEMENTS

At March 31, 2018, we have not entered into any off-balance sheet arrangements, as defined by Item 303(a)(4) of Regulation S-K.

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ITEM 3.     QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Refer to Item 7A included in our Annual Report on Form 10-K for the year ended December 31, 2017. There have been no material changes to this item since December 31, 2017, with the exception of the changes in exposure to foreign currency risk presented below.

Foreign Currency Risk

The table below provides a sensitivity analysis of our total net foreign currency exposures.

	AUD			NZD			CAD			EUR			GBP			JPY			Other			Total
At March 31, 2018
Net managed assets (liabilities), excluding derivatives	$	(21,320	)	$	(3,847	)	$	(35,289	)	$	156,039		$	59,505		$	2,079		$	138,642		$	295,809
Foreign currency derivatives, net	(62,260		)	7,236			(136,357		)	238,506			(63,860		)	(5,931		)	3,795			(18,871		)
Net managed foreign currency exposure	(83,580		)	3,389			(171,646		)	394,545			(4,355		)	(3,852		)	142,437			276,938
Other net foreign currency exposure	1			—			6			85			75			—			85,813			85,980
Total net foreign currency exposure	$	(83,579	)	$	3,389		$	(171,640	)	$	394,630		$	(4,280	)	$	(3,852	)	$	228,250		$	362,918
Net foreign currency exposure as a percentage of total shareholders’ equity	(1.6		%)	0.1		%	(3.3		%)	7.5		%	(0.1		%)	(0.1		%)	4.3		%	6.9		%
Pre-tax impact of net foreign currency exposure on shareholders’ equity given a hypothetical 10% rate movement(1)	$	(8,358	)	$	339		$	(17,164	)	$	39,463		$	(428	)	$	(385	)	$	22,825		$	36,292

(1) Assumes 10% change in underlying currencies relative to the U.S. dollar.

Total Net Foreign Currency Exposure

At March 31, 2018, our total net foreign currency exposure was $363 million net long, driven by increases in our exposures to the euro and other non-core currencies primarily due to new business written during the three months endedMarch 31, 2018 associated with the January 2018 renewal season.

ITEM 4.     CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

The Company’s management has performed an evaluation, with the participation of the Company’s Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934 (the "Exchange Act")) at March 31, 2018. Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, at March 31, 2018, our disclosure controls and procedures are effective to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC and is accumulated and communicated to management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

The Company’s management has performed an evaluation, with the participation of the Company’s Chief Executive Officer and the Company’s Chief Financial Officer, of changes in the Company’s internal control over financial reporting that occurred during the three months endedMarch 31, 2018. Based upon that evaluation, there were no changes in our internal control over financial reporting that occurred during the three months endedMarch 31, 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II     OTHER INFORMATION

ITEM 1.     LEGAL PROCEEDINGS

From time to time, the Company is subject to routine legal proceedings, including arbitrations, arising in the ordinary course of business. These legal proceedings generally relate to claims asserted by or against the Company in the ordinary course of insurance or reinsurance operations. Estimated amounts payable under such proceedings are included in the reserve for losses and loss expenses in the Consolidated Balance Sheets.

The Company is not party to any material legal proceedings arising outside the ordinary course of business.

ITEM 1A.     RISK FACTORS

There were no material changes from the risk factors disclosed in our Annual Report on Form 10-K for the year ended December 31, 2017.

ITEM 2.     UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table presents information regarding the number of shares we repurchased during the three months endedMarch 31, 2018:

ISSUER PURCHASES OF EQUITY SECURITIES

Common Shares

Period	Total Number of Shares Repurchased(a)	Average Price Paid Per Share		Total Number of Shares Repurchased as Part of Publicly Announced Plans or Programs	Maximum Number (or Approximate Dollar Value) of Shares That May Yet Be Repurchased Under the Announced Plans or Programs(b)
January 1-31, 2018	22		$49.27	—	—
February 1-28, 2018	1		$50.04	—	—
March 1-31, 2018	126		$47.87	—	—
Total	149			—	—

(a) Shares are repurchased from employees to satisfy withholding tax liabilities upon the vesting of restricted stock units.

(b) On July 5, 2017, following the offer to acquire Novae Group plc ("Novae"), the Company suspended its open market share repurchase program. On October 2, 2017, AXIS Capital acquired the shares of Novae. On December 31, 2017, authorization under the Board-authorized share repurchase plan for common share repurchases through 2017 expired. A common share repurchase plan has not been authorized for 2018.

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ITEM 5.     OTHER INFORMATION

Disclosure of Certain Activities Under Section 13(r) of the Securities Exchange Act of 1934

Section 13(r) of the Securities Exchange Act of 1934, as amended, requires issuers to disclose in their annual and quarterly reports whether they or any of their affiliates knowingly engaged in certain activities with Iran or with individuals or entities that are subject to certain sanctions under U.S. law. Issuers are required to provide this disclosure even where the activities, transactions or dealings are conducted outside of the U.S. in compliance with applicable law.

As and when allowed by the applicable law and regulations, certain of our non-U.S. subsidiaries provide treaty reinsurance coverage to non-U.S. insurers on a worldwide basis, including insurers of liability, marine, aviation and energy risks, and as a result, these underlying reinsurance portfolios may have some exposure to Iran. In addition, we underwrite insurance and facultative reinsurance on a global basis to non-U.S. insureds and insurers, including for liability, marine, aviation and energy risks. Coverage provided to non-Iranian business may indirectly cover an exposure in Iran. For example, certain of our operations underwrite global marine hull and cargo policies that provide coverage for vessels navigating into and out of ports worldwide, including Iran. For the quarter ended March 31, 2018, there has been no material amount of premium allocated or apportioned to activities relating to Iran. As we believe these activities are permitted under applicable laws and regulations, we intend for our non-U.S. subsidiaries to continue to provide such coverage to the extent permitted by applicable law.

ITEM 6.     EXHIBITS

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2.1	Rule 2.7 Announcement, dated July 5, 2017 (incorporated by reference to Exhibit 2.1 to the Company's Current Report on Form 8-K filed on July 6, 2017).
2.2	Rule 2.7 Announcement, dated August 24, 2017 (incorporated by reference to Exhibit 2.1 to the Company's Current Report on Form 8-K filed on August 25, 2017).
3.1	Certificate of Incorporation and Memorandum of Association (incorporated by reference to Exhibit 3.1 to the Company’s Registration Statement on Form S-1(Amendment No. 1) (No. 333-103620) filed on April 16, 2003).
3.2	Amended and Restated Bye-Laws (incorporated by reference to Exhibit 4.2 to the Company’s Registration Statement on Form S-8 filed on May 15, 2009).
4.1	Specimen Common Share Certificate (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-1 (Amendment No. 3) (No. 333-103620) filed on June 10, 2003).
4.2	Certificate of Designations establishing the specific rights, preferences, limitations and other terms of the Series D Preferred Shares (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on May 20, 2013).
4.3	Certificate of Designations establishing the specific rights, preferences, limitations and other terms of the Series E Preferred Shares (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on November 7, 2016).
†*10.1	Separation Agreement by and between Chris DiSipio and AXIS Specialty U.S. Services, Inc. dated March 14, 2018.
*10.2	Form of Employee Restricted Stock Unit Award Agreement (incorporated by reference to Exhibit 10.38 to the Company's Annual Report on Form 10-K filed on February 28, 2018).
†*10.3	Form of Employee Restricted Stock Unit Award Agreement (Performance Vesting).
*10.4	2018 Directors Annual Compensation Program (incorporated by reference to Exhibit 10.42 to the Company's Annual Report on Form 10-K filed on February 28, 2018).
10.5	Amendment dated March 28, 2018 to Committed Facility Letter dated March 27, 2017, by and among AXIS Specialty Limited, AXIS Re SE, AXIS Specialty Europe SE, AXIS Insurance Company, AXIS Reinsurance Company, AXIS Surplus Insurance Company and Citibank Europe plc (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed on April 3, 2018).
†31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
†31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
†32.1	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
†32.2	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
†101	The following financial information from AXIS Capital Holdings Limited’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 formatted in XBRL: (i) Consolidated Balance Sheets at March 31, 2018 and December 31, 2017; (ii) Consolidated Statements of Operations for the three months ended March 31, 2018 and 2017; (iii) Consolidated Statements of Comprehensive Income for the three months ended March 31, 2018 and 2017; (iv) Consolidated Statements of Changes in Shareholders' Equity for the three months ended March 31, 2018 and 2017; (v) Consolidated Statements of Cash Flows for the three months ended March 31, 2018 and 2017; and (vi) Notes to Consolidated Financial Statements, tagged as blocks of text and in detail.

* Exhibits 10.1 through 10.4 represent a management contract, compensatory plan or arrangement in which directors and/or executive officers are eligible to participate.

† Filed herewith.

The agreements and other documents filed as exhibits to this report are not intended to provide factual information or other disclosure other than with respect to the terms of the agreements or other documents themselves, and you should not rely on them for that purpose. In particular, any representations and warranties made by us in these agreements or other documents were made solely within the specific context of the relevant agreement or document and may not describe the actual state of affairs as of the date they were made or at any other time.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Dated: May 9,2018

AXIS CAPITAL HOLDINGS LIMITED
By:	/S/ ALBERT BENCHIMOL
	Albert Benchimol
	President and Chief Executive Officer
	(Principal Executive Officer)
	/S/ PETER VOGT
	Peter Vogt
	Chief Financial Officer
	(Principal Financial Officer)

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EX-10.1

[AXIS Letterhead]

March 14, 2018

Christopher N. DiSipio

[Address]

Re: Notice of Departure and Agreement Regarding Separation

Dear Chris,

This letter will confirm the agreement (the “Separation Agreement”), dated as of the date set forth above (the “Execution Date”), that has been reached with you in connection with your departure from with AXIS Specialty U.S. Services, Inc. (the “Company”). You and the Company make this Separation Agreement for and in consideration of the exchange of promises and the payments and benefits recited herein.

1.Notice of Departure.The Company hereby acknowledges your departure effective April 1, 2018 and hereby waives any contractual or statuary notice period. For purposes of this Separation Agreement, the “Departure Date” shall be the earliest of (i) April 1, 2018 or (ii) your death.

2.Notice Period; Transition and Cooperation.

a.     During the period (or any portion therof) commencing on the date hereof and ending on the Departure Date (the “Notice Period”), the Company may, in its absolute discretion, (A) require you to continue to perform all of your job duties or to perform only such duties as it may allocate to you, (B) require you not to perform any of your duties, (C) require you not to have any contact with customers or clients of the Company nor any contact (other than purely social contact) with such employees of the Company as the Company shall determine, and (D) exclude you from any premises of the Company. If the Company elects to take any such action, such election shall not constitute a breach by the Company of this Separation Agreement and you shall not have any claim against the Company in connection therewith so long as, during the Notice Period, the Company continues to pay to you your accrued and unpaid base salary, afford you all the employee benefits to which you may be entitled under, and in accordance with the terms of, the employee benefit plans in which you participate and otherwise comply with the terms of this Separation Agreement.

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b.    Notwithstanding the foregoing, from the date hereof up and until the Departure Date, you are expected to make yourself available to devote your time, attention, skills and ability to the performance of the tasks and duties set forth in the Statement of Work attached hereto as Exhibit A, as directed by the Chief Executive Officer of AXIS Capital Holdings Limited (“ACHL”), in his discretion, and shall faithfully and diligently endeavor to promote the business and best interests of the Company, ACHL and its subsidiaries and affiliates.

3.Resignations, General Release and Waiver. You hereby resign from any and all directorships and other offices that you hold in connection with your employment with the Company (including any directorships with subsidiaries or other affiliates of ACHL or the Company). You further agree to execute any additional documents as may be requested by the Company to effect your resignation from all such positions. You also agree to execute and deliver to the Company a General Release and Waiver on, and effective as of, the Departure Date, in the form attached to this Agreement as Exhibit B.

4.Payments and Benefits during Notice Period.During the Notice Period, and provided that you are in compliance with your obligations hereunder, the Company will pay to you your accrued and unpaid base salary through the Departure Date, any bonus awarded by the ACHL Compensation Committee in respect of 2017 performance but not yet paid as of the Departure Date and an amount equal to such reasonable and necessary unreimbursed business expenses incurred by you on behalf of the Company on or prior to the Departure Date (provided that such reimbursements must be requested not later than ninety days after the expense was incurred) and will afford you all the employee benefits to which you may be entitled under, and in accordance with the terms of, the employee benefit plans in which you participate. Any unvested restricted share units previously awarded to you by the Company that vest during the Notice Period will continue to vest in accordance with the terms of the applicable award agreements. You will not receive an equity award for 2017 performance.

5.Severance Payments.Provided that (A) you have not voluntarily terminated employment with the Company prior to the Departure Date, (B) you remain available to perform services upon the Company’s request through the Departure Date, (C) you have not commenced employment with another entity prior to the Departure Date, (D) you are not otherwise in violation of the terms of this Separation Agreement and (E) you execute a General Release and Waiver on, and effective as of, the Departure Date, in the form attached to this Agreement as Exhibit B and do not revoke such General Release and Waiver, then you and the Company agree that the Company shall pay to you the payments identified in this Section 5. You agree that these payments are in lieu of any and all amounts that you might otherwise claim from the Company or any affiliate, including but not limited to any and all amounts payable pursuant to your Employment Agreement, and you hereby waive any claim of right to any payment, right or benefit other than those set forth in this Separation Agreement or any vested plan benefit under a plan maintained by the Company or Parent. Provided that you have executed and delivered to the Company the General Release and Waiver prescribed herein on the Departure Date, and provided further that the statutory period during which you are entitled to revoke the General Release and Waiver has expired without revocation by you, the Company will provide you the following:

a. $1,832,000, less tax and payroll withholding required by law, as set forth on Exhibit C hereto, payable in a lump sum as soon as practicable following the Departure Date, but no later than the sixtieth (60th) day following the Departure Date; and

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b. An amount to compensate you for all accrued and unused vacation time as of the Departure Date consistent with the Company’s policies and procedures as set forth in the Company’s employee handbook, which amount will be payable in a lump sum as soon as practicable following the Departure Date, but no later than the sixtieth (60^th) day following the Departure Date.

c. Notwithstanding the terms of any applicable award agreements, for so long as you remain in full compliance with the obligations set forth in in Sections 6, 7, 8, 9 and 10 below and conditioned on such continued compliance, all of your outstanding and unvested restricted shares or restricted stock units granted under the Company’s Long-Term Equity Compensation Plan (a complete list of which is attached hereto asExhibit D), determined as of the Departure Date, shall continue to vest on the applicable dates set forth in the applicable award agreements granting such shares, as if no termination of employment or service had occurred.

6.Confidential Information.

a.As an executive of the Company, you will have learned or have had access to, or may have assisted in the development of, highly confidential and sensitive information and trade secrets about the Company, its operations, its subsidiaries and affiliates, its employees, and its customers, which are the property of the Company. Such Confidential Information and Trade Secrets include but are not limited to: (i) financial and business information relating to the Company, such as information with respect to costs, commissions, fees, profits, expenses, sales, markets, mailing lists, strategies and plans for future business, new business, product or other development, potential acquisitions or divestitures, and new marketing ideas, (ii) product and technical information relating to the Company, such as product formulations, new and innovative product ideas, methods, procedures, devices, machines, equipment, data processing programs, software, software codes, computer models, and research and development projects, (iii) customer information, such as the identity of the Company’s customers, the names of representatives of the Company’s customers responsible for entering into contracts with the Company, the amounts paid by such customers to the Company, specific customer needs and requirements, specific customer risk characteristics, policy expiration dates, policy terms and conditions, information regarding the markets or sources with which insurance is placed, and leads and referrals to prospective customers, (iv) personnel information, such as the identity and number of the Company’s other employees, their salaries, bonuses, benefits, skills, qualifications, and abilities, (v) any and all information in whatever form relating to any client or prospective customer of the Company, including but not limited to, its business, employees, operations, systems, assets, liabilities, finances, products, and marketing, selling and operating practices, (vi) any information not included in (i) or (ii) above which you know or should know is subject to a restriction on disclosure or which you know or should know is considered by the Company or the Company’s customers or prospective customers to be confidential, sensitive, proprietary or a trade secret or is not readily available to the public, and (vii) intellectual property, including inventions and copyrightable works. Confidential Information and Trade Secrets are not generally known or available to the general public, but have been developed, compiled or acquired by the Company at its great effort and expense. Confidential Information and Trade Secrets can be in any form: oral, written or machine readable, including electronic files, but shall not include any information known generally to the public or within the Company’s industry.

b.     You acknowledge and agree that the Company is engaged in a highly competitive business and that its competitive position depends upon its ability to maintain the confidentiality of the

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Confidential Information and Trade Secrets which were developed, compiled and acquired by the Company at its great effort and expense. You further acknowledge and agree that any disclosing, divulging, revealing, or using of any of the Confidential Information and Trade Secrets, other than in connection with the Company’s business or as appropriate to carry out your duties for the Company and its affiliates, will be highly detrimental to the Company and cause it to suffer serious loss of business and pecuniary damage.

c.    Accordingly, you agree that you will not, while associated with the Company and for so long thereafter as the pertinent information or documentation remains confidential, for any purpose whatsoever, directly or indirectly use, disseminate or disclose to any other person, organization or entity Confidential Information or Trade Secrets, except as appropriate to carry out your duties as an executive of the Company and except (i) as expressly authorized by the Chief Executive Officer of ACHL, (ii) appropriate to enforce the terms of this Agreement, or (iii) required by law or legal process; provided, that you give notice to the Company promptly on becoming aware of any obligations to disclose such information under this provision, and not less than ten days prior to making any such disclosure.

d.    Prior to the Departure Date, you will return to the Company (i) any originals and all copies of all files, notes, documents, slides (including transparencies), computer disks, printouts, reports, lists of the Company’s clients or leads or referrals to prospective clients, and other media or property in your possession or control which contain or pertain to Confidential Information or Trade Secrets, and (ii) all property of the Company, including, but not limited to, supplies, keys, access devices, books, work papers and notebooks, identification cards, computers, telephones and other equipment.

7.Non-Solicitation of Employees. Except with prior written permission of the Company, you shall not, directly or indirectly (individually or on behalf of other persons), during your employment with the Company or any of its affiliates and for a period of one (1) year following the Departure Date for any reason, hire, offer to hire, entice away or in any manner persuade or attempt to persuade any officer, employee or agent of the Company or any of its affiliates (including the Company and any subsidiary). This restriction shall apply only to those officers, employees and agents of the Company or its affiliates with whom you had contact or about whom you learned confidential information or trade secrets during the two (2) years prior to the Departure Date.

8.Non-Solicitation of Customers. You acknowledge and agree that by reason of your senior executive position with the Company, you gained knowledge of confidential information and trade secrets regarding the Company’s current and prospective customers, clients and brokers. You agree that, for a period of six months following the Departure Date, you will not, without prior written permission of the Company, directly or indirectly solicit or entice away any current or prospective customers, clients or brokers of the Company or any of its affiliates. This restriction shall apply to those current or prospective customers, clients and brokers of the Company with whom you had contact or about whom you learned confidential information or trade secrets during the two (2) years prior to the Departure Date. For the purposes of this Section, the term “contact” means interaction between you and the customer, client or broker which took place to further the Company’s or any of its affiliates’ business relationship. For purposes of this Section, the term “contact” with respect to a “prospective” customer, client or broker means interaction between you and a potential customer, client or broker of the Company or any of its affiliates which takes place to a business relationship with such potential customer, client or broker.

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9.Non-Competition. You acknowledge and agree that that the Company is engaged in a highly competitive and global business, and that by virtue of the senior executive position you held with the Company, and your knowledge of and access to trade secrets and other confidential information belonging to the Company, engaging in a business which is directly competitive with the Company will cause it great and irreparable harm. Accordingly, and in consideration for the substantial payments to be made to you under this Agreement, you agree that, except with prior written permission of the Company, you shall not, during the Notice Period and for a period of six months following the Departure Date, directly or indirectly (individually or on behalf of other persons) own, manage, operate, engage in, serve as a director, or control, or be employed in a capacity similar to the positions you held with the Company, or render consulting or other services to, any person, firm or corporation engaged in the insurance or reinsurance business or any other business in which the Company is, or has announced an intention to become, engaged in at any time during your employment with the Company. In recognition of the global nature of the Company’s business which includes the sale of its products and services globally, this restriction shall apply throughout the United States of America and in Bermuda, Dublin, Ireland, London, United Kingdom and Zurich, Switzerland. Nothing contained in this Section 9 shall be deemed to prohibit you from (i) acquiring, solely as a passive investment, no more than 5% of the total outstanding securities of any publicly-held corporation except with prior written permission of the Company. You acknowledge and agree that, in light of the substantial payments being made to you pursuant to this Agreement, strict compliance with this Section 9 will not interfere with your livelihood. In the event of a breach by you of this Section 9, you agree that (i) any payments otherwise due to you under this Agreement which have not yet been paid will be forfeited, and (ii) the Company shall have the right to demand and you shall have the obligation to pay back to the Company a pro-rata portion of the sums already paid to you under this Agreement as set forth in Section 5(a) hereof (where such pro-rata portion is determined by multiplying the sums already paid to you by a fraction where the numerator is the number of days remaining on the six month restriction set forth above at the time of such breach and the denominator is 183).

10. Nondisparagement.

a. You agree that at all times hereafter, you shall not make, or cause to be made, any public statement, observation or opinion that (i) accuses or implies that the Company or any of the Company’s senior executives engaged in any wrongful, unlawful or improper conduct, whether relating to your employment with the Company (or the termination thereof), the business or operations of the Company, or otherwise; or (ii) disparages, impugns or in any way reflects adversely upon the business or reputation of the Company or any of the Company’s senior executives. Nothing in this Section 10 shall preclude you from providing truthful testimony in response to a legal subpoena or as may otherwise be required by law.

b.The Company agrees that at all times hereafter, neither it, its affiliates or any of their officers (at the vice-president grade and above) shall make, or cause to be made, any public statement, observation or opinion that (i) accuses or implies that you engaged in any wrongful, unlawful or improper conduct, whether relating to your employment with the Company (or the termination thereof), the business or operations of the Company, or otherwise; or (ii) disparages, impugns or in any way reflects adversely upon your professional or personal reputation. Nothing in this Section 10 shall preclude the Company from providing truthful testimony in response to a legal subpoena or as may otherwise be required by law.

11. Miscellaneous.

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a.Except as otherwise expressly set forth in this Separation Agreement, to the extent necessary to carry out the intentions of the parties hereunder, the respective rights and obligations of the parties hereunder shall survive any termination of your employment. In the event of your death prior to the completion of any payments required by this Separation Agreement, any such payments will be made to your estate.

b.Any notice or other communication required or permitted under this Separation Agreement shall be effective only if it is in writing and shall be deemed to be given when delivered personally or three days after it is mailed by registered or certified mail, postage prepaid, return receipt requested or one day after it is sent by a reputable overnight courier service and, in each case, addressed to the relevant party at the address provided for such party herein:

Executive:

Christopher N. DiSipio

[Address]

Company:

AXIS Specialty U.S. Services, Inc.

11680 Great Oaks Way, Suite 500

Alpharetta, GA 30022

Attention: General Counsel

Either party may change her or its designated address by written notification to the other, which notice shall be effective on the schedule set forth above.

This Separation Agreement and the General Release and Waiver (upon its execution as provided herein), constitute the entire agreement among you and the Company with respect to the termination of your employment with the Company, and they supersede and are in full substitution for any and all prior understandings or agreements with respect to such termination, including, without limitation, that certain Employment Agreement by and between Christopher N. DiSipio and the Company dated February 27, 2014.

c.This Separation Agreement may be amended only by an instrument in writing signed by both you and the Company, and any provision hereof may be waived only by an instrument in writing signed by the party against whom or which enforcement of such waiver is sought. Any amendment to this Separation Agreement must comply with the requirements of Code Section 409A.

d.You are also hereby provided notice that under the 2016 Defend Trade Secrets Act: (x) no individual will be held criminally or civilly liable under federal or State trade secret law for the disclosure of a trade secret (as defined in the Economic Espionage Act) that is made in confidence to a federal, state, or local government official, either directly or indirectly, or to an attorney; and made solely for the purpose of reporting or investigating a suspected violation of law, or is made in a complaint or other document filed in a lawsuit or other proceeding, if such filing is made under seal so that it is not made public, and, (y) an individual who pursues a lawsuit for retaliation by an employer for reporting a suspected violation of the law may disclose the trade secret to the attorney of the individual and use the trade secret information in the court proceeding, if the individual files any document containing the trade secret under seal, and does not disclose the trade secret, except as permitted by court order.

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e.It is the desire and intent of the parties that the provisions of this Separation Agreement shall be enforced to the fullest extent permissible. In the event that any one or more of the provisions of this Separation Agreement is held to be invalid, illegal or unenforceable, the validity, legality and enforceability of the remainder hereof will not in any way be affected or impaired thereby and any such provision or provisions will be enforced to the fullest extent permitted by law. Moreover, if any one or more of the provisions contained or incorporated in this Separation Agreement is held to be excessively broad as to duration, scope, activity or subject, such provisions shall be construed by modifying, limiting or reducing them so as to be enforceable to the maximum extent compatible with applicable law.

f.This Separation Agreement, and the provisions contained in it, shall not be construed or interpreted for, or against, any party to this Separation Agreement because that party drafted or caused that party's legal representatives to draft any of its provisions.

g.This Separation Agreement shall be governed by, and construed and enforced in accordance with, the laws of New York, without reference to its choice of law rules. The parties agree that any action or proceeding with respect to this Separation Agreement shall be brought exclusively in the Supreme Court of the State of New York, New York County, or in the United States District Court for the Southern District of New York, or in any other court of competent jurisdiction sitting in the State and County of New York, and the parties agree to the personal jurisdiction thereof. The parties hereby irrevocably waive any objection they may now or hereafter have to the laying of venue of any such action in such court(s), and further irrevocably waive any claim they may now or hereafter have that any such action brought in such court(s) has been brought in an inconvenient forum. The parties recognize that, if any dispute or controversy arising from or relating to this agreement is submitted for adjudication to any court, the preservation of the secrecy of confidential information or trade secrets may be jeopardized. Consequently, the parties agree that all issues of fact shall be tried without a jury.

h.You affirm and acknowledge that you have not relied on any representations, promises, or agreements of any kind made to you in connection with your decision to execute and deliver this Separation Agreement, except for those set forth in or expressly referenced herein.

i.To the extent applicable, this Separation Agreement shall be administered in compliance with Internal Revenue Code Section 409A. Appendix A, incorporated into this Separation Agreement, contains additional information regarding Code Section 409A.

j.Your rights and obligations under this Separation Agreement are personal in nature and may not be assigned by you, except that your rights hereunder can be enforced by your estate. The Company’s rights and obligations under this Separation Agreement will inure to the benefit of, and be binding on, a successor of the Company. This Separation Agreement may be enforced by the Company’s successors and assigns.

[signatures appear on following page]

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By the respective signatures below, you and the Company agree to the terms set forth in this Separation Agreement.

AXIS Specialty U.S. Services, Inc.

By: /s/ Noreen McMullan

By: /s/ Christopher N. DiSipio Chief Human Resources Officer

Enclosure:     

Exhibit A (Statement of Work)

Exhibit B (General Release and Waiver

Exhibit C (Summary of Cash Payments)

Exhibit D (Statement of Outstanding Equity)    

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Appendix A

Compliance with Section 409A of Internal Revenue Code.

Notwithstanding any provisions herein, you and the Company confirm that they understand and agree that it is possible that certain payments contemplated by this Agreement may be deemed by the appropriate authorities to be “nonqualified deferred compensation” for purposes of Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”). Notwithstanding any other provision of this Separation Agreement to the contrary, in the event that payment of nonqualified deferred compensation made pursuant to this Separation Agreement is based upon or attributable to your termination of employment and you are at the time of your termination a “Specified Employee” then any payment of nonqualified deferred compensation required to be made to you in the first six (6) months following your termination shall be deferred and paid in a lump sum to you on the date that is six (6) months and one day after the date of your “Separation from Service” within the meaning of Section 409A of the Code. You will be a “Specified Employee” for purposes of this Separation Agreement if, on the date of your Separation from Service, you are an individual who, under the method of determination adopted by the Company, is designated as, or within the category of employees deemed to be, a “specified employee” within the meaning and in accordance with Treasury Regulation Section 1.409A-1(i). The Company shall determine in its sole discretion all matters relating to who is a “Specified Employee” and the application of and effects of the change in such determination. Notwithstanding any other provision of this Separation Agreement to the contrary, to the extent that any reimbursement of expenses constitutes nonqualified deferred compensation for purposes of Section 409A of the Code, such reimbursement shall be provided no later than December 31 of the year following the year in which the expense was incurred. The amount of expenses reimbursed in one year shall not affect the amount eligible for reimbursement in any subsequent year. The amount of any in-kind benefits provided in one year shall not affect the amount of in-kind benefits provided in any other year. The Company shall have no liability to you if this Agreement or any amounts paid or payable hereunder are subject to Section 409A of the Code or the additional tax thereunder. Although the Company does not guarantee the tax treatment of any payments under the Agreement, the intent of the parties is that the payments and benefits under this Agreement be exempt from, or comply with, Section 409A of the Code and to the maximum extent permitted by the agreement shall be limited, construed and interpreted in accordance with such intent. In no event whatsoever shall the Company or its affiliates or their respective officers, directors, employees or agents be liable for any additional tax, interest or penalties that may be imposed on Executive by Section 409A of the Code or damages for failing to comply with Section 409A of the Code.

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Exhibit A

STATEMENT OF WORK

AXIS Specialty U.S. Services, Inc. (the “Company”) desires that the following tasks be satisfactorily completed by you through your Departure Date and shall provide necessary resources and direction to you for their completion. Accordingly, you will concentrate your time and reasonable best efforts to the completion of the following:

• Support and reinforcement the Company’s external and internal messaging related to the integration of AXIS Accident and Health business into the Insurance and Reinsurance segments.

• Collaborate with leadership personnel (the Chief Executive Officer of ACHL, Chief Transformation Officer, Chief Executive Officer of AXIS Insurance and Chief Executive Officer of AXIS Reinsurance) to formulate a transition plan for the AXIS Accident and Health business, which is designed to ensure the stability of the AXIS Accident and Health business, including, but not limited to advising and providing assistance with the following:

i. The orderly transition of the current pipeline of transactions, projects and intiatives for the AXIS Accident and Health business;

ii. The orderly transition of strategic investments for the AXIS Accident and Health business;

iii. Business planning for the AXIS Accident and Health business for the 2018 fiscal year;

iv. The transition of external relationships/contacts for which you had primary or significant responsibility to the CEO of ACHL, Chief Transformation Officer, CEO of AXIS Insurance or CEO of AXIS Reinsurance;

v. The creation of new reporting lines for AXIS Accident and Health personnel; and

vi. The coordination of back-office activities for AXIS Accident and Health, including providing assistance with the integration of support personnel.

• Make yourself available to attend meetings with leadership personnel regarding the transition, planning and integration of AXIS Accident and Health into the Insurance and Reinsurance segments, as requested by the CEO of ACHL.

• If and as requested by the CEO of ACHL in writing, provide a periodic status update as to the status of the integration activities.

• Attend telephonic (but not in-person) meetings of the Executive Committee and provide reports on the AXIS Accident and Health business at the telephonic meetings, as requested by the CEO of ACHL.

• Work on other projects, in each case, as requested by the CEO of ACHL.

• Attest or confirm SOX or other regulatory compliance in connection with 2017 year-end financial results, or otherwise.

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• Adherence to the duties and obligations set forth in the AXIS Code of Business Conduct, AXIS Employee Handbook, AXIS End User IT Policy, AXIS Insider Trading Policy and AXIS Travel and Expense Policy.

• Continue to work a normal schedule and endeavor to promote the business and best interests of the Company, ACHL and its subsidiaries and affiliates.

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Exhibit B

GENERAL RELEASE AND WAIVER

In consideration of the payment by AXIS Specialty U.S. Services, Inc. (the “Company”) to or for the benefit of Christopher N. DiSipio of the payments and benefits set forth in that certain Notice of Departure and Separation Agreement by and between Christopher N. DiSipio (“Executive”) and the Company dated March 14, 2018 (“Separation Agreement”), and in compliance with the terms of the Separation Agreement, Executive hereby makes and delivers to the Company this General Release and Waiver (“Release”) as set forth herein:

Release of All Claims

Executive voluntarily, knowingly and willingly on behalf of himself, his heirs, executors, administrators, successors and assigns, hereby irrevocably and unconditionally release the Company, its parents, their subsidiaries, divisions and affiliates, together with their respective owners, assigns, agents, directors, partners, officers, employees, consultants, shareholders, attorneys and representatives, and any of their predecessors and successors and each of their estates, heirs and assigns (collectively, the "Company Releasees") from any and all charges, complaints, claims, liabilities, obligations, promises, agreements, causes of action, rights, costs, losses, debts and expenses of any nature whatsoever, known or unknown, which he or his heirs, executors, administrators, successors or assigns ever had, now have or hereafter can, will or may have (either directly, indirectly, derivatively or in any other representative capacity) against the Company or any of the other Company Releasees by reason of any matter, cause or thing whatsoever arising on or before the date this General Release and Waiver is executed by Executive. In addition, this Release includes, without limitation, any rights or claims relating in any way to any and all employment relationships between Executive and the Company or any of the Company Releasees, or the termination thereof, arising under the Employment Act 2000 of Bermuda, the Human Rights Act 1981 of Bermuda, Title VII of the Civil Rights Act of 1964, Sections 1981 through 1988 of Title 42 of the United States Code, The Employee Retirement Income Security Act of 1974 ("ERISA") (except for any vested benefits under any tax qualified benefit plan), The Immigration Reform and Control Act, The Americans with Disabilities Act of 1990, The Age Discrimination in Employment Act of 1967 (“ADEA”), The Workers Adjustment and Retraining Notification Act, The Fair Credit Reporting Act, New York State Human Rights Law, New York Human Rights Law, New York Rights of Persons With Disabilities, New York Confidentiality of Records of Genetic Tests, New York Whistleblower Law, New York Statutory Provision Regarding Retaliation/Discrimination for Filing a Workers’ Compensation Claim, New York Adoptive Parents’ Child Care Leave Law, New York Smokers’ Rights Law, New York Equal Pay Law, New York AIDS Testing Confidentiality Act, New York Nondiscrimination Against Genetic Disorders Law, New York Bone Marrow Leave Law, New York Equal Rights Law, New York Executive Law Section 290 et seq., The New York State Labor Relations Act, the general regulations of the New York State Division of Human Rights, The New York Labor Law, The New York Wage Hour and Wage Payment Laws, The New York Minimum Wage Law, as amended, The New York City Administrative Code, New York State Public Employee Safety and Health Act, the New York City Charter and Administrative Code, New York Labor Law §740 et

seq., the New York Legal Activities Law, New York Labor Law §201-d, the New York occupational safety and health laws, the New York Worker Adjustment and Retraining Notification Act, the New Jersey Law Against Discrimination – N.J. Rev. Stat. §10:5-1 et seq,, New Jersey Statutory Provision Regarding Retaliation/Discrimination for Filing a Workers’ Compensation Claim – N.J. Rev. Stat. §34:15-39.1 et seq., New Jersey Family Leave Act – N.J. Rev. Stat. §34:11B-1 et seq., New Jersey Smokers’ Rights Law – N.J. Rev. Stat. §34:6B-1 et seq., New Jersey Equal Pay Act – N.J. Rev. Stat. §34:11-56.1 et seq., New Jersey Genetic Privacy Act – N.J. Rev. Stat. Title 10, Ch. 5, §10:5-43 et seq., New Jersey Conscientious Employee Protection Act (Whistleblower Protection) – N.J. Stat. Ann. §34:19-3 et seq., New Jersey Wage Payment and Work Hour Laws, The New Jersey Public Employees’ Occupational Safety and Health Act- N.J. Stat. Ann. §34:6A-25 et seq., New Jersey Fair Credit Reporting Act, and the New Jersey laws regarding Political Activities of Employees, Lie Detector Tests, Jury Duty, Employment Protection, and Discrimination, the Millville Dallas Airmotive Plant Job Loss Notification Act, and any other federal, state or local law, statute, rule, regulation, or ordinance, any public policy, contract, tort, or common law whether of any state in the United States or Bermuda; or any basis for recovering costs, fees, or other expenses including attorneys' fees incurred in these matters. Notwithstanding anything in this Release to the contrary, Executive is not waiving, and shall not be deemed to have waived, any entitlements under the terms of the Separation Agreement, the Company’s Bye-Laws or the applicable terms of any other agreement, plan or program of the Company or its affiliates that survive a termination of employment.

Acknowledgements and Affirmations

Executive affirms and agrees that the Company has fulfilled all of its obligations to him under Bermudan, Swiss, U.S. and New York employment laws, including without limitation the Bermudan Employment Act 2000 as may be amended from time to time, and has not violated his rights under such employment laws. Executive affirms and acknowledges that the payments, that are referenced in this Release fully, fairly and finally compensate him for any and all monies that may be due or become to him under any such laws in connection with his employment or termination of his employment, including without limitation any severance allowance or repatriation expenses.

By signing this Release, Executive represents that Executive has not commenced or joined in any claim, charge, action or proceeding whatsoever against the Company or any of the Company Releasees with respect to the matters released hereby. Executive further represents that he will not be entitled to any personal recovery in any action or proceeding of any nature whatsoever against the Company or any of the other Company Releasees that may be commenced on his behalf arising out of any of the matters released hereby.

Executive also affirms that he has been paid and/or has received all compensation, wages, bonuses and/or commissions to which he may be entitled prior to the date hereof except as expressly provided in, or preserved by, this Release and the Separation Agreement. Executive affirms he has been granted any leave to which he was entitled under the Employment Act 2000 of Bermuda, the Family and Medical Leave Act or similar Bermuda, Swiss, U.S., state or local

leave or disability accommodation laws. Executive further affirms that he has no unreported workplace injuries or occupational diseases.

Return and Possession of Property

Executive affirms that he has returned all of the Company’s property, documents, and/or any confidential information in his possession or control to which he is not entitled.

No Admission by Company

The Company's acceptance and acknowledgement of this Release and the payments and benefits set forth herein are not, and shall not be construed as, any admission of liability or wrongdoing on the part of the Company or any of the Company Releasees.

Revocation Rights

EXECUTIVE IS ADVISED THAT HE HAS UP TO TWENTY-ONE (21) CALENDAR DAYS TO CONSIDER THIS GENERAL RELEASE AND WAIVER. EXECUTIVE ALSO IS ADVISED TO CONSULT WITH AN ATTORNEY PRIOR TO HIS SIGNING OF THIS GENERAL RELEASE AND WAIVER.

EXECUTIVE MAY REVOKE THIS GENERAL RELEASE AND WAIVER FOR A PERIOD OF SEVEN (7) CALENDAR DAYS FOLLOWING THE DAY HE SIGNS THIS AGREEMENT AND GENERAL RELEASE. ANY REVOCATION WITHIN THIS PERIOD MUST BE SUBMITTED, IN WRITING, TO THE AXIS GENERAL COUNSEL AND STATE, "I HEREBY REVOKE MY ACCEPTANCE OF OUR AGREEMENT AND GENERAL RELEASE." THE REVOCATION MUST BE PERSONALLY DELIVERED TO THE GENERAL COUNSEL OR HIS/HER DESIGNEE, OR MAILED TO THE GENERAL COUNSEL AND POSTMARKED WITHIN SEVEN (7) CALENDAR DAYS AFTER EXECUTIVE SIGNS THIS AGREEMENT AND GENERAL RELEASE.

EXECUTIVE AGREES THAT ANY MODIFICATIONS, MATERIAL OR OTHERWISE, MADE TO THIS AGREEMENT AND GENERAL RELEASE, DO NOT RESTART OR AFFECT IN ANY MANNER THE ORIGINAL UP TO TWENTY-ONE (21) CALENDAR DAY CONSIDERATION PERIOD.

EXECUTIVE FREELY AND KNOWINGLY, AND AFTER DUE CONSIDERATION, ENTERS INTO THIS AGREEMENT AND GENERAL RELEASE INTENDING TO WAIVE, SETTLE AND RELEASE ALL CLAIMS EXECUTIVE HAS OR MIGHT HAVE AGAINST RELEASEES.

Descriptive Headings

The Section headings contained herein are for reference purposes only and will not in any way affect the meaning or interpretation of this Release.

Enforceability

It is the desire and intent of the parties that the provisions of this General Release and Waiver shall be enforced to the fullest extent permissible. In the event that any one or more of the provisions of this General Release and Waiver is held to be invalid, illegal or unenforceable, the validity, legality and enforceability of the remainder hereof will not in any way be affected or impaired thereby and any such provision or provisions will be enforced to the fullest extent permitted by law.

Each Party the Drafter

This General Release and Waiver, and the provisions contained in it, shall not be construed or interpreted for, or against, any party to this General Release and Waiver because that party drafted or caused that party's legal representatives to draft any of its provisions.

Governing Law

This General Release and Waiver shall be governed by, and construed and enforced in accordance with, the laws of New York, without reference to its choice of law rules. The parties hereby irrevocably consent to the jurisdiction of New York and courts located in New York, New York for purposes of resolving any dispute under this General Release and Waiver and expressly waive any objections as to venue in any such courts.

Whistleblowing Claims

Nothing in this General Release prohibits or prevents Executive from filing a charge with or participating, testifying, or assisting in any investigation, hearing, or other proceeding before the U.S. Equal Employment Opportunity Commission, the National Labor Relations Board or a similar agency enforcing federal, state or local anti-discrimination laws. However, to the maximum extent permitted by law, Executive agrees that if such an administrative claim is made to such an anti-discrimination agency, Executive shall not be entitled to recover any individual monetary relief or other individual remedies. In addition, nothing in this Agreement, including but not limited to the release of claims nor the confidentiality clauses, prohibits Executive from: (1) reporting possible violations of federal law or regulations, including any possible securities laws violations, to any governmental agency or entity, including but not limited to the U.S. Department of Justice, the U.S. Securities and Exchange Commission, the U.S. Congress, or any agency Inspector General; (2) making any other disclosures that are protected under the whistleblower provisions of federal law or regulations; or (3) otherwise fully participating in any federal whistleblower programs, including but not limited to any such programs managed by the U.S. Securities and Exchange Commission and/or the Occupational Safety and Health Administration. Moreover, nothing in this General Release and Waiver prohibits or prevents Executive from receiving individual monetary awards or other individual relief by virtue of participating in such federal whistleblower programs.

No Other Assurances

Executive affirms and acknowledges that he has not relied on any representations, promises, or agreements of any kind made to him in connection with his decision to execute and deliver this General Release and Waiver, except for those set forth in or expressly referenced herein.

Now therefore, intending to be fully and irrevocably bound by the terms hereof, Executive has executed this General Release and Waiver and has delivered it to AXIS Capital Holdings Limited as of this 2nd day of April, 2018.

Executed and delivered by:             Accepted by:

AXIS SPECIALTY U.S. SERVICES, INC.

By:    /s/ Christopher DiSipio         By: /s/ Noreen McMullan

Executive                        

Exhibit C

Severance Benefit	Amount and Payment Timing (Subject to Timely Execution of Release)
An amount equal to one year’s base salary at the rate in effect immediately prior to the Departure Date.	$500,000
An amount equal to the 2018 annual bonus that Executive would have been entitled to receive for 2018 had he remained employed, calculated as if all targets were met.	$500,000
An amount equal to the 2018 annual bonus that Executive would have been entitled to receive for 2018, calculated as if all targets were met, prorated based on the number of days Executive was employed in 2018. .	$125,000
A cash payment for health care coverage.	$41,000
A cash payment in lieu of an equity award for 2017 performance.	$666,000

C-1

Exhibit D

AXIS Stock Price as of January 24, 2018					$51.46
Award Number	Award Date	Award Type	Vest Date	Unvested Share Amount		Estimated Value of Unvested Shares		Comments
A3630 (1)	3/1/2015	PSU	3/1/2018	5,613			$288,845	Vests Prior to Departure
A1397	3/1/2014	RSU	3/1/2018	1,015			$52,232	Vests Prior to Departure
A2169	3/1/2014	RSU	3/1/2018	1,015			$52,232	Vests Prior to Departure
A3614	3/1/2015	RSU	3/1/2018	1,578			$81,204	Vests Prior to Departure
A4406	3/1/2016	RSU	3/1/2018	1,673			$86,093	Vests Prior to Departure
A5453	3/1/2017	RSU	3/1/2018	1,616			$83,159	Vests Prior to Departure
Sub Total				12,510			$643,765
A4424 (2)	3/1/2016	PSU	3/1/2019	6,691			$344,319
A5463 (2)	3/1/2017	PSU	3/1/2020	5,624			$289,411
A3614	3/1/2015	RSU	3/1/2019	1,579			$81,255
A4406	3/1/2016	RSU	3/1/2019	1,673			$86,093
A5453	3/1/2017	RSU	3/1/2019	1,617			$83,211
A4406	3/1/2016	RSU	3/1/2020	1,673			$86,093
A5453	3/1/2017	RSU	3/1/2020	1,617			$83,211
A5453	3/1/2017	RSU	3/1/2021	1,617			$83,211
Sub Total				22,091			$1,136,803
Total				34,601			$1,780,567
(1) 2015 PSU reflects 80% payout. Target award is 7,016
(2) 2016 & 2017 PSUs estimated at target but will ultimately vest in accordance with
final performance results.

D-1

EX-10.3

AXIS CAPITAL HOLDINGS LIMITED

2017 LONG-TERM EQUITY COMPENSATION PLAN

Employee Restricted Stock Unit Agreement (Performance Vesting / 100% Stock Settled)

You (the “Participant”) have been granted an award of Restricted Stock Units (the “Award”) with a value based on ordinary shares, par value $0.0125 per share (“Shares”), of AXIS Capital Holdings Limited, a Bermuda company (the “Company”), pursuant to the AXIS Capital Holdings Limited 2017 Long-Term Equity Compensation Plan (the “Plan”). The date of grant of the Award (the “Award Date”), the vesting start date (the “Vesting Start Date”) and the base number of Restricted Stock Unitssubject to the Award (the “Target Number”) are as set forth in your restricted stock unit account maintained on the Morgan Stanley Benefit Access website or such other website as may be designated by the Compensation Committee of the Board of Directors of AXIS Capital Holdings Limited (the “Committee”). The actual number of Restricted Stock Units that you will be eligible to earn with respect to this Award (the “Award Units”), subject to meeting the applicable service and performance vesting requirements, will equal the Target Number multiplied by the applicable “Performance Multiplier” (as defined in Exhibit A hereto). This Award constitutes an unfunded and unsecured promise of the Company to deliver (or cause to be delivered to you) on the terms and conditions set forth herein the number of Shares corresponding to the earned Award Units.

By your acceptance of the grant of the Award on the Morgan Stanley Benefit Access website, you agree that the Award is granted under and governed by the terms and conditions of the Plan and this Restricted Stock Unit Agreement (the “Agreement”).

1.    GRANT OF RESTRICTED STOCK UNITS.

(a)    Award. On the terms and conditions set forth in this Agreement, the Company hereby grants to the Participant on the Award Date the Award.

(b)    Plan and Defined Terms. The Award is granted pursuant to the Plan, a copy of which the Participant acknowledges having received. The terms and provisions of the Plan are incorporated into this Agreement by this reference. All capitalized terms that are used in this Agreement and not otherwise defined herein shall have the meanings ascribed to them in the Plan.

2.    PERIOD OF RESTRICTION.

(i)    The Restricted Stock Units subject to the Award shall be restricted during the period (the “Period of Restriction”) commencing on the Award Date and expiring on the first to occur of:

(a)    The normal scheduled vesting of the Award Units. The Award Units shall vest in a single installment on the third anniversary of the Vesting Start Date (the “Anniversary Date”).

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(b)    The Participant’s death or permanent Disability; or

(c)    The date of the Participant’s termination without Cause or termination for Good Reason, in each case, within 24 months following a Change of Control.

(d)    Definitions. As used herein, the following terms shall have the meanings set forth below:

(1)    “Cause” shall have the meaning set forth in the Participant’s employment agreement with the Company, if any, or in the absence of an employment agreement definition shall mean (A) any act or omission which constitutes a material breach by the Participant of the terms of his or her employment, (B) the Participant’s conviction of a felony or commission of any act which would rise to the level of a felony, (C) the Participant’s conviction or commission of a lesser crime or offense that adversely impacts or potentially could impact upon the business or reputation of the Company and/or affiliates and subsidiaries in a material way, (D) the Participant’s willful violation of specific lawful directives of the Company, (E) the Participant’s commission of a dishonest or wrongful act involving fraud, misrepresentation, or moral turpitude causing damage or potential damage to the Company and/or its affiliates and subsidiaries, (F) the Participant’s willful failure to perform a substantial part of the Participant’s duties or (G) the Participant’s breach of fiduciary duty.

(2)    “Change of Control” shall have the meaning set forth in the Plan, provided however, that only an event that constitutes a change in control or ownership within the meaning of Treasury Regulation 1.409A-3(i)(5) shall be a Change of Control for purposes of this Agreement.

(3)    “Disability” shall mean the Participant’s permanent disability which constitutes a disability within the meaning of Section 409A(a)(2)(C) of the Code.

(4)    “Good Reason” shall have the meaning set forth in the Participant’s employment agreement with the Company, if any, or in the absence of an employment agreement definition shall mean (A) the scope of the Participant’s position, authority or duties with the Company is materially adversely changed, (B) the Participant’s compensation is not paid or is materially reduced or there is a material adverse change in the Participant’s employee benefits or (C) the Participant is required by the Company to relocate to a place more than 50 miles from the Participant’s current place of employment; provided that, in each case, “Good Reason” shall not exist unless the Participant provides the Company with written notice of the Participant’s intent to terminate employment as a result of such event, providing the specific reasons therefore, and the Company does not make the necessary corrections within thirty days of receipt of the Participant’s written notice, following which the Participant may terminate his or her employment for “Good Reason” within the ten days following expiration of such thirty day notice period.

(5)    “RSU Retirement Plan” shall mean the AXIS Specialty U.S. Services, Inc. Executive RSU Retirement Plan, as in effect as of the date of this Agreement.

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(ii)    Absent subsequent Committee action, and except as otherwise provided under the RSU Retirement Plan (to the extent such plan is applicable to the Participant), the Award Units will not automatically vest upon or following the Participant’s retirement.

(iii)    Notwithstanding the foregoing, to the extent that the Participant is party to an employment agreement with the Company that provides for vesting of the Participant’s restricted stock units on an accelerated or otherwise more favorable basis as compared to the terms set forth in this Section 2, then the Award Units shall vest pursuant to the terms set forth in such employment agreement.

3.    ISSUANCE OF AWARD UNITS.

Subject to the Participant’s continued employment with the Company during the Period of Restriction through the applicable vesting dates, the Company shall deliver to the Participant within thirty (30) days following the Anniversary Date (or within thirty (30) days following any vesting event described under Section 2(i)(b) or 2(i)(c) hereof, if applicable) with respect to the number of Award Units earned as determined in accordance with Exhibit A hereto, 100% of the Shares underlying such earned Award Units as of the Anniversary Date with such Share delivery fully satisfying the Company’s obligations to the Participant with respect to such corresponding Award Units. In the event that the Participant’s employment terminates for any reason prior to the expiration of the Period of Restriction (except as described in Section 2(i)(b), 2(i)(c) or the RSU Retirement Plan, to the extent such plan is applicable to the Participant), the Award will immediately terminate and the Company will have no further obligation or liability to the Participant. Subject to Section 4, the Participant will have no rights as a shareholder of the Company with respect to the Shares underlying the Award Units until such time as the Shares underlying the Award Units are actually delivered to the Participant.

4.    RESTRICTIONS, VOTING RIGHTS AND DIVIDEND EQUIVALENTS.

(a)    Restrictions. The Award may not be sold, transferred, pledged, assigned or otherwise alienated or hypothecated at any time.

(b)    Voting Rights. Prior to the delivery of Shares underlying the Award Units pursuant to this Agreement, the Participant shall not be entitled to exercise any voting rights with respect to the Award Units and, except as provided in Section 4(c), shall not be entitled to receive dividends or other distributions with respect to the Award Units.

(c)    Dividend Equivalents. Dividend equivalents shall be paid to the Participant with respect to the Award Units during the Period of Restriction. Any dividend equivalents paid with respect to the Award Units during the Period of Restriction will be held by the Company, or a depository appointed by the Committee, for the Participant's account. All cash or share dividend equivalents so held shall be payable at the same time as the delivery of Shares are made with respect to the Award Units as set forth in Section 3 and shall be forfeited and shall not be paid in the event the Award is terminated as set forth in Section 3.

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(d)    Leaves of Absence.     For any purpose under this Agreement, employment shall be deemed to continue while the Participant is on a bona fide leave of absence, if such leave was approved by the Company in writing and if continued crediting of employment for such purpose is expressly required by the terms of such leave or by applicable law (as determined by the Company).

5.    RESTRICTIONS ON TRANSFER.

(a)    Transfer Restrictions. Regardless of whether the offering and sale of Units under the Plan have been registered under the U.S. Securities Act of 1933, as amended (the “Securities Act”) or otherwise, the Company, in its sole discretion, may impose restrictions upon the sale, pledge or other transfer of the Shares deliverable in respect of the Award Units (including the placement of appropriate legends on stock certificates or the imposition of stop-transfer instructions) if, in the judgment of the Company, such restrictions are necessary or desirable in order to achieve compliance with the Company's Bye-Laws, the Securities Act, the U.S. Securities Exchange Act of 1934, as amended, the securities laws of any country or state or any other applicable law, rule or regulation.

(b)    Legends. All certificates evidencing Shares issued in respect of Award Units under this Agreement shall bear such restrictive legends as are required or deemed advisable by the Company under the provisions of any applicable law, rule or regulation (including to reflect any restrictions to which you may be subject under any applicable securities laws). If, in the opinion of the Company and its counsel, any legend placed on a stock certificate representing Shares issued under this Agreement is no longer required, the holder of such certificate shall be entitled to exchange such certificate for a certificate representing the same number of Shares but without such legend.

6.    MISCELLANEOUS PROVISIONS.

(a)    Bye-Laws. All Shares acquired pursuant to this Agreement shall be subject to any applicable restrictions contained in the Company's Bye-Laws.

(b)    No Retention Rights. Nothing in this Agreement or in the Plan shall confer upon the Participant any right to continue employment for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Company or any Affiliate employing or retaining the Participant or of the Participant, which rights are hereby expressly reserved by each, to terminate his or her employment at any time and for any reason, with or without Cause.

(c)    Notice. Any notice required by the terms of this Agreement shall be given in writing and shall be deemed effective upon delivery by hand, upon delivery by reputable express courier or, if the recipient is located in the United States, upon deposit with the United States Postal Service, by registered or certified mail, with postage and fees prepaid. Notice shall be addressed to the Company at its principal executive office and to the Participant at the address that he or she most recently provided in writing to the Company.

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(d)    Choice of Law. This Agreement shall be governed by, and construed in accordance with, the laws of Bermuda.

(e)    Counterparts. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

(f)    Modification or Amendment. This Agreement may be amended or modified by the Committee; provided that any amendment or modification that would adversely affect the Participant’s rights with respect to the Award must be made by written agreement executed by the parties hereto; and provided, that the adjustments permitted pursuant to Sections 4(b) and 7(b) of the Plan may be made without such written agreement.

(g)    Severability. In the event any provision of this Agreement shall be held illegal or invalid for any reason, the illegality or invalidity shall not affect the remaining provisions of this Agreement, and this Agreement shall be construed and enforced as if such illegal or invalid provision had not been included.

(h)    Recoupment Policy. The Award is subject in all respects to the Company’s Executive Compensation Recoupment Policy, as the same may be amended from time to time, or any successor policy thereto (to the extent such plan is applicable to the Participant).

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Exhibit A

Performance Metrics for Determining the Number of Earned Award Units

Performance Level	DBVPS Percentile	Performance Multiplier
Maximum	85th or above	200%
Target	55th	100%
Threshold	25th	25%
Below Threshold	<25th	0%

The Performance Multiplier shall be determined by linear interpolation for achievement falling between the above percentages; provided, that there shall be no interpolation for achievement that is below threshold level performance or above maximum level performance.

For purposes of this Exhibit A, the following terms shall have the following meanings:

“DBVPS” shall mean diluted book value per share, as determined for purposes of the relevant company’s financial reporting purposes.

“DBVPS Percentile” shall mean the Company’s percentile rank among its Peer Group in terms of DBVPS growth during the Performance Period (rounded to the nearest hundredth of a percent), as determined by the Committee in good faith.

“Peer Group” shall mean the performance peer companies identified by the Committee in the Company’s annual proxy statement filed with the U.S. Securities and Exchange Commission during the same calendar year in which the Award Date occurs; provided, however, that the Committee may equitably adjust the members of the Peer Group to account for any member company which ceases to be a publicly traded company (due to merger, corporate reorganization, bankruptcy or otherwise) or engages in a spin-off or similar transaction prior to the end of the Performance Period.

“Performance Multiplier” shall mean the applicable multiplier as determined in accordance with the table above based on the achieved DBVPS Percentile; provided, however, that in the event that the Period of Restriction terminates prior to the end of the Performance Period due to an event described in Sections 2(i)(b) or 2(i)(c) of the Agreement, then the Performance Multiplier shall automatically be deemed to equal 100%.

“Performance Period” shall mean the period commencing on September 30 of the calendar year preceding the year in which the Award Date occurs and ending on the third anniversary of such date.

PAC ID 0317 (03 18)

6

EX-31.1

Exhibit 31.1

CERTIFICATION

AXIS Capital Holdings Limited

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Albert Benchimol, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of AXIS Capital Holdings Limited for the period ended March 31, 2018;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

		/S/ ALBERT BENCHIMOL
Date:	May 9, 2018	Albert Benchimol President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

AXIS Capital Holdings Limited

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Peter Vogt, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of AXIS Capital Holdings Limited for the period ended March 31, 2018;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

		/S/ PETER VOGT
Date:	May 9, 2018	Peter Vogt Chief Financial Officer

EX-32.1

Exhibit 32.1

AXIS CAPITAL HOLDINGS LIMITED

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of AXIS Capital Holdings Limited (the “Company”) for the quarterly period ended March 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Albert Benchimol, Chief Executive Officer of the Company, hereby certify, to the best of my knowledge, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	May 9, 2018	/s/ ALBERT BENCHIMOL
		Albert Benchimol
		President and Chief Executive Officer

This certification accompanies this Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by such Act, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent that the registrant specifically incorporates it by reference.

EX-32.2

Exhibit 32.2

AXIS CAPITAL HOLDINGS LIMITED

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of AXIS Capital Holdings Limited (the “Company”) for the quarterly period ended March 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Peter Vogt, Chief Financial Officer of the Company, hereby certify, to the best of my knowledge, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	May 9, 2018	/s/ PETER VOGT
		Peter Vogt
		Chief Financial Officer

This certification accompanies this Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by such Act, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent that the registrant specifically incorporates it by reference.

XML

DOCUMENT AND ENTITY INFORMATION - shares	3 Months Ended
	Mar. 31, 2018	May 01, 2018
DOCUMENT AND ENTITY INFORMATION [ABSTRACT]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Entity Registrant Name	AXIS CAPITAL HOLDINGS LTD
Entity Central Index Key	0001214816
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		83,518,960

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments:
Fixed maturities, available for sale, at fair value (Amortized cost 2018: $11,898,060; 2017: $12,611,219)	$ 11,801,396	$ 12,622,006
Equity securities, at fair value (Cost 2018: $374,091; 2017: $552,867)	435,742	635,511
Mortgage loans, held for investment, at amortized cost and fair value	364,769	325,062
Other investments, at fair value	1,009,587	1,009,373
Equity method investments	108,597	108,597
Short-term investments, at amortized cost and fair value	56,246	83,661
Total investments	13,776,337	14,784,210
Cash and cash equivalents	1,227,736	948,626
Restricted cash and cash equivalents	416,844	415,160
Accrued interest receivable	73,928	81,223
Insurance and reinsurance premium balances receivable	3,892,957	3,012,419
Reinsurance recoverable on unpaid and paid losses	3,129,303	3,338,840
Deferred acquisition costs	721,820	474,061
Prepaid reinsurance premiums	1,015,163	809,274
Receivable for investments sold	19,433	11,621
Goodwill	102,003	102,003
Intangible assets	253,808	257,987
Value of business acquired	150,936	206,838
Other assets	307,041	317,915
Total assets	25,087,309	24,760,177
Liabilities
Reserve for losses and loss expenses	12,034,643	12,997,553
Unearned premiums	4,659,858	3,641,399
Insurance and reinsurance balances payable	1,251,629	899,064
Senior notes and notes payable	1,376,835	1,376,529
Payable for investments purchased	144,315	100,589
Other liabilities	355,634	403,779
Total liabilities	19,822,914	19,418,913
Shareholders’ equity
Preferred shares	775,000	775,000
Common shares (shares issued 2018: 176,580; 2017: 176,580 shares outstanding 2018: 83,518; 2017: 83,161)	2,206	2,206
Additional paid-in capital	2,289,497	2,299,166
Accumulated other comprehensive income (loss)	(85,216)	92,382
Retained earnings	6,076,294	5,979,666
Treasury shares, at cost (2018: 93,062; 2017: 93,419 shares)	(3,793,386)	(3,807,156)
Total shareholders’ equity	5,264,395	5,341,264
Total liabilities and shareholders’ equity	$ 25,087,309	$ 24,760,177

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 11,898,060	$ 12,611,219
Equity securities, cost	$ 374,091	$ 552,867
Common shares, shares issued (in shares)	176,580	176,580
Common shares, shares outstanding (in shares)	83,518	83,161
Treasury shares, shares (in shares)	93,062	93,419

XML

CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
Net premiums earned	$ 1,167,402	$ 938,703
Net investment income	100,999	98,664
Other insurance related income (losses)	6,606	(3,783)
Net investment losses:
Other-than-temporary impairment (OTTI) losses	(414)	(6,553)
Other realized and unrealized investment losses	(14,416)	(18,497)
Total net investment losses	(14,830)	(25,050)
Total revenues	1,260,177	1,008,534
Expenses
Net losses and loss expenses	661,345	606,942
Acquisition costs	229,260	189,792
General and administrative expenses	169,837	161,260
Foreign exchange losses	37,860	21,465
Interest expense and financing costs	16,763	12,791
Reorganization expenses	13,054	0
Amortization of value of business acquired	57,110	0
Amortization of intangibles	2,782	0
Total expenses	1,188,011	992,250
Income before income taxes and interest in income (loss) of equity method investments	72,166	16,284
Income tax benefit	1,036	9,337
Interest in loss of equity method investments	0	(5,766)
Net income	73,202	19,855
Preferred share dividends	10,656	14,841
Net income available to common shareholders	$ 62,546	$ 5,014
Net income per common share:
Basic net income (in usd per share)	$ 0.75	$ 0.06
Diluted net income (in usd per share)	$ 0.75	$ 0.06
Weighted average number of common shares outstanding - basic (in shares)	83,322	86,022
Weighted average number of common shares outstanding - diluted (in shares)	83,721	86,793
Cash dividends declared per common share (in usd per share)	$ 0.39	$ 0.38

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 73,202	$ 19,855
Other comprehensive income (loss), net of tax:
Unrealized investment gains (losses) arising during the period	(112,191)	67,703
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	785	24,968
Unrealized investment gains (losses) arising during the period, net of reclassification adjustment	(111,406)	92,671
Foreign currency translation adjustment	1,270	29,869
Total other comprehensive income (loss), net of tax	(110,136)	122,540
Comprehensive income (loss)	$ (36,934)	$ 142,395

XML

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Preferred shares	Common shares (par value)	Additional paid-in capital	Accumulated other comprehensive income (loss)	Unrealized gains (losses) on available for sale investments, net of tax:	Cumulative foreign currency translation adjustments, net of tax:	Retained earnings	Treasury shares, at cost
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASU | Accounting Standards Update 2018-02						$ 0		$ 0
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01						0		0
Total shareholders’ equity at Dec. 31, 2016		$ 1,126,074	$ 2,206	$ 2,299,857	$ (121,841)	(82,323)	$ (39,518)	6,527,627	$ (3,561,553)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares reissued				(37,363)					38,248
Shares repurchased									(151,242)
Share-based compensation expense				14,177
Unrealized gains (losses) arising during the period	$ 92,671					92,671
Foreign currency translation adjustment	29,869						29,869
Net income	19,855							19,855
Preferred share dividends								(14,841)
Common share dividends								(33,379)
Total shareholders’ equity at Mar. 31, 2017	6,230,365	1,126,074	2,206	2,276,671	699	10,348	(9,649)	6,499,262	(3,674,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASU | Accounting Standards Update 2018-02						2,142		(2,142)
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01						(69,604)		69,604
Total shareholders’ equity at Dec. 31, 2017	5,341,264	775,000	2,206	2,299,166	92,382	89,962	2,420	5,979,666	(3,807,156)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares reissued				(19,272)					20,933
Shares repurchased									(7,163)
Share-based compensation expense				9,603
Unrealized gains (losses) arising during the period	(111,406)					(111,406)
Foreign currency translation adjustment	1,270						1,270
Net income	73,202							73,202
Preferred share dividends								(10,656)
Common share dividends								(33,380)
Total shareholders’ equity at Mar. 31, 2018	$ 5,264,395	$ 775,000	$ 2,206	$ 2,289,497	$ (85,216)	$ (88,906)	$ 3,690	$ 6,076,294	$ (3,793,386)

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 73,202	$ 19,855
Adjustments to reconcile net income to net cash used in operating activities:
Net investment losses	8,909	25,050
Net realized and unrealized gains on other investments	(12,950)	(18,211)
Amortization of fixed maturities	9,895	12,498
Interest in loss of equity method investments	0	5,766
Other amortization and depreciation	68,397	6,467
Share-based compensation expense, net of cash payments	(1,481)	(24,758)
Non-cash foreign exchange losses	0	24,149	$ 24,000
Changes in:
Accrued interest receivable	3,350	5,596
Reinsurance recoverable balances	(113,656)	348,942
Deferred acquisition costs	(253,369)	(171,493)
Prepaid reinsurance premiums	(218,772)	(86,534)
Reserve for loss and loss expenses	184,511	(237,773)
Unearned premiums	1,056,045	654,475
Insurance and reinsurance balances, net	(854,993)	(559,456)
Other items	(36,973)	(40,834)
Net cash used in operating activities	(87,885)	(36,261)
Cash flows from investing activities:
Fixed maturities	(2,474,418)	(2,670,518)
Equity securities	(42,522)	(98,559)
Mortgage loans	(59,838)	0
Other investments	(31,755)	(63,742)
Equity method investments	0	(1,000)
Short-term investments	(57,688)	(2,320)
Proceeds from the sale of:
Fixed maturities	2,442,673	2,429,084
Equity securities	194,970	70,575
Other investments	44,493	131,777
Short-term investments	46,719	7,087
Proceeds from redemption of fixed maturities	319,526	521,716
Proceeds from redemption of short-term investments	16,022	111,931
Proceeds from the repayment of mortgage loans	20,237	10,233
Purchase of other assets	0	(4,427)
Net cash provided by investing activities	418,419	441,837
Cash flows from financing activities:
Repurchase of common shares - open market	0	(120,549)
Taxes paid on withholding shares	(7,163)	(23,260)
Dividends paid - common shares	(35,273)	(38,541)
Dividends paid - preferred shares	(10,656)	(14,841)
Net cash used in financing activities	(53,092)	(197,191)
Effect of exchange rate changes on foreign currency cash, cash equivalents, and restricted cash	3,354	1,678
Increase in cash, cash equivalents, and restricted cash	280,796	210,063
Cash, cash equivalents, and restricted cash - beginning of period	1,363,786	1,241,507	1,241,507
Cash, cash equivalents, and restricted cash - end of period	$ 1,644,582	$ 1,451,570	$ 1,363,786

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parenthetical) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Statement of Cash Flows [Abstract]
Transfer from investments	$ 513

XML

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

These unaudited Consolidated Financial Statements (the "financial statements") have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") for interim financial information and with the U.S. Securities and Exchange Commission's ("SEC") instructions to Form 10-Q and Article 10 of Regulation S-X and include AXIS Capital Holdings Limited ("AXIS Capital") and its subsidiaries (the "Company"). Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. This Quarterly Report on Form 10-Q should be read in conjunction with the financial statements and related notes included in AXIS Capital's Annual Report on Form 10-K for the year ended December 31, 2017, as filed with the SEC.

In the opinion of management, these financial statements reflect all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the Company's financial position and results of operations for the periods presented.

The results of operations for any interim period are not necessarily indicative of the results for a full year. All inter-company accounts and transactions have been eliminated.

To facilitate comparison of information across periods, certain reclassifications have been made to prior year amounts to conform to the current year's presentation. These reclassifications did not impact results of operations, financial condition or liquidity.

Tabular dollar and share amounts are in thousands, except per share amounts. All amounts are reported in U.S. dollars.

Significant Accounting Policies

There was one notable change in our significant accounting policies subsequent to our Annual Report on Form 10-K for the year ended December 31, 2017.

a) Investments

Recognition and Measurement of Financial Assets and Financial Liabilities

Fixed maturities and equity securities are reported at fair value at the balance sheet date (see Note 4 'Fair Value Measurements'). Effective January 1, 2018, the Company adopted ASU 2016-01 "Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities," which requires:

• equity investments (except those accounted for under the equity method of accounting, investments that are consolidated or those that meet a practicability exception) to be measured at fair value with changes in fair value recognized in net income,

• simplifies the impairment assessment of equity investments without readily determinable values by requiring a qualitative assessment to identify impairment, eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost,

• requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes,

• requires separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the organization has elected to measure the liabilities in accordance with the fair value option,

• requires the separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and

• clarifies that the reporting organization should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the organization’s other deferred tax assets.

Upon adoption of this guidance, net unrealized gains on equity securities of $70 million, net of deferred income taxes of $13 million, were reclassified from accumulated other comprehensive income into retained earnings. As prescribed, the prior period has not been restated to conform to the current presentation.

New Accounting Standards Adopted in 2018

Revenue From Contracts With Customers

Effective January 1, 2018, the Company adopted Accounting Standards Update ("ASU" ) 2014-09 "Revenue from Contracts with Customers (Topic 606)," using the modified retrospective transition approach. This guidance affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards, such as accounting for insurance contracts. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.

The Company generated fee income of $10 million for the three months ended March 31, 2018 which is within the scope of this ASU. These fees represents service fees and reimbursement of expenses earned by the Company's reinsurance segment related to services provided to its strategic capital partners. These fees are recognized when the related services have been performed and are reported in other insurance related income (losses) in the Consolidated Statements of Operations. Given that the timing and measurement of revenue associated with impacted contracts did not change, the adoption of this guidance did not have a material impact on the Company's results of operations, financial condition and liquidity.

Classification of Certain Cash Receipts and Cash Payments

Effective January 1, 2018, the Company adopted ASU 2016-15, "Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments," which addresses diversity in practice in how eight specific cash receipts and cash payments should be presented and classified on the statement of cash flows. The adoption of this guidance did not impact the Company's results of operations, financial condition and liquidity.

Restricted Cash

Effective January 1, 2018, the Company adopted ASU 2016-18, "Statement of Cash Flows (Topic 230) - Restricted Cash," which addresses diversity in practice in the classification and presentation of changes in restricted cash on the statement of cash flows. This guidance requires a statement of cash flows to explain the change during the period in the total of cash, cash equivalents, restricted cash and restricted cash equivalents. Transfers between cash and cash equivalents and restricted cash and restricted cash equivalents will no longer be presented on the statement of cash flows. To facilitate comparison of the Company's Consolidated Statements of Cash Flows, the Company adopted this guidance utilizing the full retrospective approach for all periods presented in the Company's Consolidated Financial Statements. As a result, the Company's Consolidated Statements of Cash Flows now explains the change during the period in the total of cash, cash equivalents, and restricted cash. Therefore, restricted cash is now included with cash and cash equivalents in the reconciliation of the beginning of period and end of period total amounts shown on the statement of cash flows. The adoption of this guidance did not impact the Company's results of operations, financial condition and liquidity.

Stock Compensation - Scope of Modification Accounting

Effective January 1, 2018, the Company adopted ASU 2017-09 "Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting," which provides clarity and reduces diversity in practice of applying the guidance in Topic 718 to a change to the terms or conditions of a share-based payment award. This ASU provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The guidance states that an entity should account for the effects of a modification unless all the following are met:

1. the fair value of the modified award is the same as the fair value of the original award immediately before the original award is modified;

2. the vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified; and the classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified.

The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this Update. The adoption of this guidance did not impact the Company's results of operations, financial condition and liquidity.

Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

Effective January 1, 2018, the Company adopted ASU 2018-02 "Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" which was a response to a financial reporting issue that arose as a consequence of the U.S. federal government tax bill, H.R.1, An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018 ("U.S. Tax Reform"), which was enacted on December 22, 2017.

U.S. GAAP currently requires deferred tax liabilities and assets to be adjusted for the effect of a change in tax laws or rates with the effect included in income from continuing operations in the reporting period that includes the enactment date. This guidance is applicable even in situations in which the related income tax effects of items in accumulated other comprehensive income were originally recognized in other comprehensive income rather than in income from continuing operations. As the adjustment of deferred taxes due to the reduction of the historical corporate income tax rate to the newly enacted corporate income tax rate is required to be included in income from continuing operations, the tax effects of items within accumulated other comprehensive income (referred to as stranded tax effects for purposes of this Update) do not reflect the appropriate tax rate.

The amendments in this Update allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from U.S. Tax Reform. Consequently, the amendments eliminate the stranded tax effects resulting from U.S. Tax Reform and will improve the usefulness of information reported to financial statement users. However, because the amendments only relate to the reclassification of the income tax effects of U.S. Tax Reform, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected.

As a consequence of U.S. Tax Reform, the Company recognized a tax benefit of $2 million related to the revaluation of net deferred tax liabilities associated with the reduction in the U.S. corporate income tax rate from 35% to 21%, attributable to net unrealized investment gains associated with investments held by the Company's U.S. domiciled entities. Upon adoption of this guidance, the tax benefit of $2 million was reclassified from accumulated other comprehensive income into retained earnings.

Recently Issued Accounting Standards Not Yet Adopted

Leases

In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)" which provides a new comprehensive model for lease accounting. The guidance will require a lessee to recognize a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the impact of this guidance on the Company's results of operations, financial condition and liquidity.

Measurement of Credit Losses on Financial Instrument

In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments" which replaces the "incurred loss" impairment methodology with an approach based on "expected losses" to estimate credit losses on certain types of financial instruments and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The guidance requires financial assets measured at amortized cost to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost of the financial asset to present the net carrying value at the amount expected to be collected on the financial asset. Credit losses relating to available-for-sale debt securities will be recorded through an allowance for credit losses. The guidance also provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. This guidance is effective for interim and annual periods beginning after December 15, 2019. Early adoption is permitted for interim and annual periods beginning after December 15, 2018. The Company is currently evaluating the impact of this guidance on its results of operations, financial condition and liquidity.

Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment" that eliminates the requirement to calculate the implied fair value of goodwill (i.e., Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, an impairment charge will be based on the excess of a reporting unit's carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current goodwill impairment test). This guidance is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019, with early adoption permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The guidance will be adopted on a prospective basis.

Premium Amortization on Purchased Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08 "Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20) - Premium Amortization on Purchased Callable Debt Securities" which shortens the amortization period for certain purchased callable debt securities held at a premium. This guidance is effective for interim and annual reporting periods, beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the impact of this guidance on our results of operations, financial condition and liquidity.

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SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

SEGMENT INFORMATION

AXIS Capital's underwriting operations are organized around its global underwriting platforms, AXIS Insurance and AXIS Re. The Company has determined that it has two reportable segments, insurance and reinsurance. The Company does not allocate its assets by segment, with the exception of goodwill and intangible assets, as it evaluates the underwriting results of each segment separately from the results of its investment portfolio.

During the three months ended March 31, 2018, the Company realigned its accident and health business by integrating this business and its operations into the Company's insurance and reinsurance segments. Financial results relating to the Company's accident and health line of business were previously included in the Company's insurance segment. As a result of the realignment, accident and health results are included in the results of both the insurance and reinsurance segments of the Company with effect from January 1, 2018.

Insurance

The Company's insurance segment offers specialty insurance products to a variety of niche markets on a worldwide basis. The product lines in this segment are property, marine, terrorism, aviation, credit and political risk, professional lines, liability, accident and health, together with discontinued lines, which represents lines of business that Novae Group plc ("Novae") exited or placed into run-off in the three month period ended December 31, 2016 and in the three month period ended March 31, 2017.

Reinsurance

The Company's reinsurance segment provides non-life treaty reinsurance to insurance companies on a worldwide basis. The product lines in this segment are catastrophe, property, professional lines, credit and surety, motor, liability, agriculture, engineering, marine and other, accident and health, together with discontinued lines, which represents lines of business that Novae exited or placed into run-off in the three month period ended December 31, 2016 and in the three month period ended March 31, 2017. The reinsurance segment also wrote derivative based risk management products designed to address weather and commodity price risks until July 1, 2017.

The following tables present the underwriting results of the Company's reportable segments, as well as the carrying values of allocated goodwill and intangible assets:

	2018									2017
Three months ended and at March 31,	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written	$	880,848		$	1,781,947		$	2,662,795		$	545,261		$	1,366,610		$	1,911,871
Net premiums written	547,893			1,437,978			1,985,871			356,836			1,152,122			1,508,959
Net premiums earned	580,059			587,343			1,167,402			391,964			546,739			938,703
Other insurance related income (losses)	620			5,986			6,606			42			(3,825		)	(3,783		)
Net losses and loss expenses	(321,538		)	(339,807		)	(661,345		)	(241,085		)	(365,857		)	(606,942		)
Acquisition costs	(87,329		)	(141,931		)	(229,260		)	(54,004		)	(135,788		)	(189,792		)
General and administrative expenses	(102,370		)	(37,296		)	(139,666		)	(85,256		)	(36,545		)	(121,801		)
Underwriting income	$	69,442		$	74,295		143,737			$	11,661		$	4,724		16,385
Corporate expenses							(30,171		)							(39,459		)
Net investment income							100,999									98,664
Net investment losses							(14,830		)							(25,050		)
Foreign exchange losses							(37,860		)							(21,465		)
Interest expense and financing costs							(16,763		)							(12,791		)
Reorganization expenses							(13,054		)							—
Amortization of value of business acquired							(57,110		)							—
Amortization of intangibles							(2,782		)							—
Income before income taxes and interest in income (loss) of equity method investments							$	72,166								$	16,284
Net loss and loss expense ratio	55.4		%	57.9		%	56.7		%	61.5		%	66.9		%	64.7		%
Acquisition cost ratio	15.1		%	24.2		%	19.6		%	13.8		%	24.8		%	20.2		%
General and administrative expense ratio	17.6		%	6.3		%	14.5		%	21.8		%	6.7		%	17.2		%
Combined ratio	88.1		%	88.4		%	90.8		%	97.0		%	98.4		%	102.1		%
Goodwill and intangible assets	$	506,747		$	—		$	506,747		$	84,613		$	—		$	84,613

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INVESTMENTS

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

INVESTMENTS

a)     Fixed Maturities and Equity securities

Fixed maturities

The amortized cost and fair values of the Company's fixed maturities classified as available for sale were as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Non-credit OTTI in AOCI(5)
At March 31, 2018
Fixed maturities
U.S. government and agency	$	1,821,951	$	908	$	(25,894	)	$	1,796,965	$	—
Non-U.S. government	649,396		21,084		(9,256		)	661,224		—
Corporate debt	4,670,815		40,698		(71,082		)	4,640,431		—
Agency RMBS(1)	1,956,394		4,644		(46,193		)	1,914,845		—
CMBS(2)	1,042,704		1,964		(14,047		)	1,030,621		—
Non-Agency RMBS	39,930		1,997		(530		)	41,397		(866		)
ABS(3)	1,566,484		4,932		(4,718		)	1,566,698		—
Municipals(4)	150,386		781		(1,952		)	149,215		—
Total fixed maturities	$	11,898,060	$	77,008	$	(173,672	)	$	11,801,396	$	(866	)
At December 31, 2017
Fixed maturities
U.S. government and agency	$	1,727,643	$	1,735	$	(16,909	)	$	1,712,469	$	—
Non-U.S. government	798,582		17,240		(9,523		)	806,299		—
Corporate debt	5,265,795		61,922		(29,851		)	5,297,866		—
Agency RMBS(1)	2,414,720		8,132		(27,700		)	2,395,152		—
CMBS(2)	776,715		4,138		(3,125		)	777,728		—
Non-Agency RMBS	45,713		1,917		(799		)	46,831		(853		)
ABS(3)	1,432,884		5,391		(1,994		)	1,436,281		—
Municipals(4)	149,167		1,185		(972		)	149,380		—
Total fixed maturities	$	12,611,219	$	101,660	$	(90,873	)	$	12,622,006	$	(853	)

(1) Residential mortgage-backed securities ("RMBS") originated by U.S. government-sponsored agencies.

(2) Commercial mortgage-backed securities ("CMBS").

(3) Asset-backed securities (ABS) include debt tranched securities collateralized primarily by auto loans, student loans, credit card receivables collateralized debt obligations ("CDOs") and collateralized loan obligations ("CLOs").

(4) Municipals include bonds issued by states, municipalities and political subdivisions.

(5) Represents the non-credit component of the other-than-temporary impairment ("OTTI") losses, adjusted for subsequent sales, maturities and redemptions. It does not include the change in fair value subsequent to the impairment measurement date.

Equity Securities

The cost and fair values of the Company's equity securities were as follows:

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
At March 31, 2018
Equity securities
Common stocks	$	23,251	$	1,668	$	(977	)	$	23,942
Exchange-traded funds	211,301		51,843		(514		)	262,630
Bond mutual funds	139,539		9,631		—			149,170
Total equity securities	$	374,091	$	63,142	$	(1,491	)	$	435,742
At December 31, 2017
Equity securities
Common stocks	$	22,836	$	3,412	$	(590	)	$	25,658
Exchange-traded funds	356,252		71,675		(294		)	427,633
Bond mutual funds	173,779		9,440		(999		)	182,220
Total equity securities	$	552,867	$	84,527	$	(1,883	)	$	635,511

In the normal course of investing activities, the Company actively manages allocations to non-controlling tranches of structured securities (variable interests) issued by Variable Interest Entities ("VIEs"). These structured securities include RMBS, CMBS and ABS . The Company also invests in limited partnerships (hedge funds, direct lending funds, private equity funds and real estate funds) and CLO equity tranched securities, which are all variable interests issued by VIEs (see Note 3(c) 'Other Investments'). The Company does not have the power to direct the activities that are most significant to the economic performance of the VIEs therefore the Company is not the primary beneficiary of any of these VIEs. The maximum exposure to loss on these interests is limited to the amount of investment by the Company. The Company has not provided financial or other support with respect to these structured securities other than the original investment.

Contractual Maturities

Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The contractual maturities of fixed maturities are shown below:

	Amortized Cost		Fair Value		% of Total Fair Value
At March 31, 2018
Maturity
Due in one year or less	$	513,226	$	507,980	4.3	%
Due after one year through five years	4,642,999		4,626,323		39.2	%
Due after five years through ten years	1,942,501		1,911,664		16.2	%
Due after ten years	193,822		201,868		1.7	%
	7,292,548		7,247,835		61.4	%
Agency RMBS	1,956,394		1,914,845		16.2	%
CMBS	1,042,704		1,030,621		8.7	%
Non-Agency RMBS	39,930		41,397		0.4	%
ABS	1,566,484		1,566,698		13.3	%
Total	$	11,898,060	$	11,801,396	100.0	%
At December 31, 2017
Maturity
Due in one year or less	$	486,659	$	484,663	3.8	%
Due after one year through five years	4,906,207		4,912,189		38.9	%
Due after five years through ten years	2,338,964		2,350,433		18.6	%
Due after ten years	209,357		218,729		1.7	%
	7,941,187		7,966,014		63.0	%
Agency RMBS	2,414,720		2,395,152		19.0	%
CMBS	776,715		777,728		6.2	%
Non-Agency RMBS	45,713		46,831		0.4	%
ABS	1,432,884		1,436,281		11.4	%
Total	$	12,611,219	$	12,622,006	100.0	%

Gross Unrealized Losses

The following table summarizes fixed maturities and equity securities in an unrealized loss position and the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:

	12 months or greater					Less than 12 months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
At March 31, 2018(1)
Fixed maturities
U.S. government and agency	$	179,214	$	(7,184	)	$	1,219,143	$	(18,710	)	$	1,398,357	$	(25,894	)
Non-U.S. government	47,017		(4,693		)	214,545		(4,563		)	261,562		(9,256		)
Corporate debt	335,415		(15,212		)	2,853,336		(55,870		)	3,188,751		(71,082		)
Agency RMBS	603,008		(24,241		)	1,011,088		(21,952		)	1,614,096		(46,193		)
CMBS	29,098		(1,272		)	684,264		(12,775		)	713,362		(14,047		)
Non-Agency RMBS	8,089		(453		)	108,548		(77		)	116,637		(530		)
ABS	43,804		(455		)	547,077		(4,263		)	590,881		(4,718		)
Municipals	11,101		(375		)	93,140		(1,577		)	104,241		(1,952		)
Total fixed maturities	$	1,256,746	$	(53,885	)	$	6,731,141	$	(119,787	)	$	7,987,887	$	(173,672	)
At December 31, 2017
Fixed maturities
U.S. government and agency	$	194,916	$	(5,963	)	$	1,389,792	$	(10,946	)	$	1,584,708	$	(16,909	)
Non-U.S. government	62,878		(6,806		)	204,110		(2,717		)	266,988		(9,523		)
Corporate debt	407,300		(11,800		)	2,041,845		(18,051		)	2,449,145		(29,851		)
Agency RMBS	759,255		(17,453		)	1,172,313		(10,247		)	1,931,568		(27,700		)
CMBS	31,607		(703		)	348,943		(2,422		)	380,550		(3,125		)
Non-Agency RMBS	8,029		(788		)	4,197		(11		)	12,226		(799		)
ABS	57,298		(570		)	392,170		(1,424		)	449,468		(1,994		)
Municipals	11,230		(269		)	65,632		(703		)	76,862		(972		)
Total fixed maturities	$	1,532,513	$	(44,352	)	$	5,619,002	$	(46,521	)	$	7,151,515	$	(90,873	)
Equity securities
Common stocks	$	—	$	—		$	3,202	$	(590	)	$	3,202	$	(590	)
Exchange-traded funds	—		—			12,323		(294		)	12,323		(294		)
Bond mutual funds	—		—			12,184		(999		)	12,184		(999		)
Total equity securities	$	—	$	—		$	27,709	$	(1,883	)	$	27,709	$	(1,883	)

(1) Effective January 1, 2018, the Company adopted ASU No. 2016-01 which requires equity securities to be measured at fair value with changes in fair value recognized in net income therefore equity securities at fair value are excluded from the table above at March 31, 2018.

Fixed Maturities

At March 31,2018, 2,940 fixed maturities (2017: 2,424) were in an unrealized loss position of $174 million (2017: $91 million), of which $11 million (2017: $7 million) was related to securities below investment grade or not rated.

At March 31,2018, 555 fixed maturities (2017: 627) had been in a continuous unrealized loss position for twelve months or greater and had a fair value of $1,257 million (2017: $1,533 million). Following a credit impairment review, it was concluded that these securities as well as the remaining securities in an unrealized loss position were temporarily impaired at March 31,2018, and were expected to recover in value as the securities approach maturity. At March 31,2018, the Company did not intend to sell the securities in an unrealized loss position and it is more likely than not that the Company will not be required to sell these securities before the anticipated recovery of their amortized costs.

b) Mortgage Loans

The following table provides a breakdown of the Company's mortgage loans held-for-investment:

	March 31, 2018				December 31, 2017
	Carrying Value		% of Total		Carrying Value		% of Total
Mortgage Loans held-for-investment:
Commercial	$	364,769	100	%	$	325,062	100	%
	364,769		100	%	325,062		100	%
Valuation allowances	—		—	%	—		—	%
Total Mortgage Loans held-for-investment	$	364,769	100	%	$	325,062	100	%

The primary credit quality indicator for commercial mortgage loans is the debt service coverage ratio which compares a property’s net operating income to amounts needed to service the principal and interest due under the loan, (generally, the lower the debt service coverage ratio, the higher the risk of experiencing a credit loss) and the loan-to-value ratio which compares the unpaid principal balance of the loan to the estimated fair value of the underlying collateral (generally, the higher the loan-to-value ratio, the higher the risk of experiencing a credit loss). The debt service coverage ratio and loan-to-value ratio, as well as the values utilized in calculating these ratios, are updated annually, on a rolling basis.

The Company has a high quality mortgage loan portfolio with weighted average debt service coverage ratios in excess of 2.9x and weighted average loan-to-value ratios of less than 60%. At March 31,2018 there are no credit losses associated with the commercial mortgage loans held by the Company.

At March 31,2018, there are no past due amounts.

c) Other Investments

The following tables provide a breakdown of the Company's other investments, together with additional information relating to the liquidity of each category:

	Fair Value				Redemption Frequency (if currently eligible)	Redemption     Notice Period
At March 31, 2018
Long/short equity funds	$	25,489	3	%	Annually	60 days
Multi-strategy funds	283,298		28	%	Quarterly, Semi-annually	60-95 days
Event-driven funds	37,680		4	%	Annually	45 days
Direct lending funds	261,902		26	%	n/a	n/a
Private equity funds	65,811		7	%	n/a	n/a
Real estate funds	54,720		5	%	n/a	n/a
CLO-Equities	28,556		2	%	n/a	n/a
Other privately held investments	48,787		5	%	n/a	n/a
Overseas deposits	203,344		20	%	n/a	n/a
Total other investments	$	1,009,587	100	%
At December 31, 2017
Long/short equity funds	$	38,470	4	%	Annually	60 days
Multi-strategy funds	286,164		28	%	Quarterly, Semi-annually	60-95 days
Event-driven funds	39,177		4	%	Annually	45 days
Direct lending funds	250,681		25	%	n/a	n/a
Private equity funds	68,812		7	%	n/a	n/a
Real estate funds	50,009		5	%	n/a	n/a
CLO-Equities	31,413		2	%	n/a	n/a
Other privately held investments	46,430		5	%	n/a	n/a
Overseas deposits	198,217		20	%	n/a	n/a
Total other investments	$	1,009,373	100	%

n/a -notapplicable

The investment strategies for the above funds are as follows:

• Long/short equity funds: Seek to achieve attractive returns primarily by executing an equity trading strategy involving both long and short investments in publicly-traded equity securities.

• Multi-strategy funds: Seek to achieve above-market returns by pursuing multiple investment strategies to diversify risks and reduce volatility. This category includes funds of hedge funds which invest in a large pool of hedge funds across a diversified range of hedge fund strategies.

• Event-driven funds: Seek to achieve attractive returns by exploiting situations where announced or anticipated events create opportunities.

• Direct lending funds: Seek to achieve attractive risk-adjusted returns, including current income generation, by investing in funds which provide financing directly to borrowers.

• Private equity funds: Seek to achieve attractive risk-adjusted returns by investing in private transactions over the course of several years.

• Real estate funds: Seek to achieve attractive risk-adjusted returns by making and managing investments in real estate and real estate securities and businesses.

Two common redemption restrictions which may impact the Company's ability to redeem hedge funds are gates and lockups. A gate is a suspension of redemptions which may be implemented by the general partner or investment manager of the fund in order to defer, in whole or in part, the redemption request in the event the aggregate amount of redemption requests exceeds a predetermined percentage of the fund's net assets which may otherwise hinder the general partner or investment manager's ability to liquidate holdings in an orderly fashion in order to generate the cash necessary to fund extraordinarily large redemption payouts. A lockup period is the initial amount of time an investor is contractually required to hold the security before having the ability to redeem. During the three months ended March 31,2018 and 2017, neither of these restrictions impacted the Company's redemption requests. At March 31,2018, $25 million (2017: $38 million), representing 7% (2017: 11%) of total hedge funds, relate to a holding where the Company is still within the lockup period. The expiration of this lockup period is in March 2019. 

At March 31,2018, the Company had $128 million (2017: $137 million) of unfunded commitments as a limited partner in direct lending funds. Once the full amount of committed capital has been called by the General Partner of each of these funds, the assets will not be fully returned until the completion of the fund's investment term. These funds have investment terms ranging from five to ten years and the General Partners of certain funds have the option to extend the term by up to three years.

At March 31,2018, the Company had $17 million (2017: $16 million) of unfunded commitments as a limited partner in multi-strategy hedge funds. Once the full amount of committed capital has been called by the General Partner of each of these funds, the assets will not be fully returned until after the completion of the funds' investment term. These funds have investment terms ranging from two years to the dissolution of the underlying fund.

At March 31,2018, the Company had $105 million (2017: $115 million) of unfunded commitments as a limited partner in funds which invest in real estate and real estate securities and businesses. These funds have investment terms ranging from seven years to the dissolution of the underlying fund.

At March 31,2018, the Company had $18 million (2017: $21 million) of unfunded commitments as a limited partner in a private equity fund. The life of the fund is subject to the dissolution of the underlying funds. The Company expects the overall holding period to be over ten years.

During 2015, the Company made a $50 million commitment as a limited partner of a bank revolver opportunity fund. The fund has an investment term of seven years and the General Partners have the option to extend the term by up to two years. At March 31,2018, this commitment remains unfunded. It is not anticipated that the full amount of this fund will be drawn.

During 2017, the Company made a $75 million commitment as a limited partner of an open-ended commercial mortgage income fund. At March 31,2018, this commitment remains unfunded.

Syndicate 2007 holds overseas deposits which include investments in private funds where the underlying investments are primarily U.S. government, Non-U.S. government and corporate debt securities. The funds do not trade on an exchange therefore are not included within available for sale investments.

d) Equity Method Investments

During 2016, the Company paid $108 million including direct transaction costs to acquire 19% of the common equity of Harrington Reinsurance Holdings Limited ("Harrington"), the parent company of Harrington Re Ltd. ("Harrington Re"), an independent reinsurance company jointly sponsored by AXIS Capital and The Blackstone Group L.P. ("Blackstone"). Through long-term service agreements, AXIS Capital will serve as Harrington Re's reinsurance underwriting manager and Blackstone will serve as exclusive investment management service provider. As an investor, the Company expects to benefit from underwriting profit generated by Harrington Re and the income and capital appreciation Blackstone seeks to deliver through its investment management services. In addition, the Company has entered into an arrangement with Blackstone under which underwriting and investment related fees will be shared equally. Harrington is not a variable interest entity. Given that the Company exercises significant influence over the operating and financial policies of this investee, the Company accounts for the ownership in Harrington under the equity method of accounting. The Company's proportionate share of the underlying equity in net assets resulted in a basis difference of $5 million which represents initial transactions costs.

During the three months ended March 31,2017, the Company recorded an impairment charge of $6 million, related to a U.S. based insurance company, which reduced the carrying value of the investment from $9 million to $3 million. During the three months ended June 30, 2017, the carrying value of the investment was reduced to $nil. These charges were included in interest in income (loss) of equity method investments in the Consolidated Statement of Operations.

e) Net Investment Income

Net investment income was derived from the following sources:

	Three months ended March 31,
	2018			2017
Fixed maturities	$	83,958		$	77,407
Other investments	13,704			18,962
Equity securities	1,758			3,478
Mortgage loans	3,125			2,477
Cash and cash equivalents	4,153			3,095
Short-term investments	875			438
Gross investment income	107,573			105,857
Investment expenses	(6,574		)	(7,193		)
Net investment income	$	100,999		$	98,664

f) Net Investment Losses

The following table provides an analysis of net investment losses:

	Three months ended March 31,
	2018			2017
Gross realized investment gains
Fixed maturities and short-term investments	$	31,628		$	20,777
Equity securities	17,557			15,783
Gross realized investment gains	49,185			36,560
Gross realized investment losses
Fixed maturities and short-term investments	(43,535		)	(52,935		)
Equity securities	(1,276		)	(189		)
Gross realized investment losses	(44,811		)	(53,124		)
Net OTTI recognized in net income	(414		)	(6,553		)
Change in fair value of investment derivatives(1)	2,023			(1,933		)
Net unrealized gains (losses) on equity securities(2)	(20,813		)	—
Net investment losses	$	(14,830	)	$	(25,050	)

(1) Refer to Note 5 'Derivative Instruments'.

(2) Effective January 1, 2018, the Company adopted ASU No. 2016-01.  The change in fair value of equity securities is now recognized in net investment losses.

The following table summarizes the OTTI recognized in net income by asset class:

	Three months ended March 31,
	2018		2017
Fixed maturities:
Non-U.S. government	$	—	$	4,282
Corporate debt	414		2,271
Total OTTI recognized in net income	$	414	$	6,553

The following table provides a roll forward of the credit losses ("credit loss table"), before income taxes, for which a portion of the OTTI was recognized in AOCI:

	Three months ended March 31,
	2018			2017
Balance at beginning of period	$	1,494		$	1,493
Credit impairments recognized on securities not previously impaired	—			—
Additional credit impairments recognized on securities previously impaired	—			—
Change in timing of future cash flows on securities previously impaired	—			—
Intent to sell of securities previously impaired	—			—
Securities sold/redeemed/matured	(10		)	(10		)
Balance at end of period	$	1,484		$	1,483

g) Reverse Repurchase Agreements

At March 31,2018, the Company held $24 million (2017: $37 million) of reverse repurchase agreements. These loans are fully collateralized, are generally outstanding for a short period of time and are presented on a gross basis as part of cash and cash equivalents in the Company's Consolidated Balance Sheets. The required collateral for these loans is either cash or U.S. Treasuries at a minimum rate of 102% of the loan principal. Upon maturity, the Company receives principal and interest income. The Company monitors the estimated fair value of the securities loaned and borrowed on a daily basis with additional collateral obtained as necessary throughout the duration of the transaction.

XML

FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

Fair Value Hierarchy

Fair value is defined as the price to sell an asset or transfer a liability (i.e. the "exit price") in an orderly transaction between market participants. U.S. GAAP prescribes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data. The level in the hierarchy within which a given fair value measurement falls is determined based on the lowest level input that is significant to the measurement. The hierarchy is broken down into three levels as follows:

• Level 1 - Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access.

• Level 2 - Valuations based on quoted prices in active markets for similar assets or liabilities, quoted prices for identical assets or liabilities in inactive markets, or for which significant inputs are observable (e.g. interest rates, yield curves, prepayment speeds, default rates, loss severities, etc.) or can be corroborated by observable market data.

• Level 3 - Valuations based on inputs that are unobservable and significant to the overall fair value measurement. The unobservable inputs reflect the Company's own judgments about assumptions that market participants might use.

The availability of observable inputs can vary from financial instrument to financial instrument and is affected by a wide variety of factors including, for example, the type of financial instrument, whether the financial instrument is new and not yet established in the marketplace, and other characteristics particular to the transaction. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires significantly more judgment.

Accordingly, the degree of judgment exercised by management in determining fair value is greatest for instruments categorized in Level 3. In periods of market dislocation, the observability of prices and inputs may be reduced for many instruments. This may lead the Company to change the selection of valuation technique (from market to cash flow approach) or may cause the Company to use multiple valuation techniques to estimate the fair value of a financial instrument. This circumstance could cause an instrument to be reclassified between levels within the fair value hierarchy.

Valuation Techniques

The valuation techniques, including significant inputs and assumptions generally used to determine the fair values of the Company's financial instruments as well as the classification of the fair values of its financial instruments in the fair value hierarchy are described in detail below.

Fixed Maturities

At each valuation date, the Company uses the market approach valuation technique to estimate the fair value of its fixed maturities portfolio, when possible. This market approach includes, but is not limited to, prices obtained from third party pricing services for identical or comparable securities and the use of "pricing matrix models" using observable market inputs such as yield curves, credit risks and spreads, measures of volatility, and prepayment speeds. Pricing from third party pricing services is sourced from multiple vendors, when available, and the Company maintains a vendor hierarchy by asset type based on historical pricing experience and vendor expertise. When prices are unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers who are active in the corresponding markets. The valuation techniques including significant inputs generally used to determine the fair values of the Company's fixed maturities by asset class as well as the classifications of the fair values of these securities in the fair value hierarchy are described in detail below.

U.S. government and agency

U.S. government and agency securities consist primarily of bonds issued by the U.S. Treasury and mortgage pass-through agencies such as the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation and the Government National Mortgage Association. As the fair values of U.S. Treasury securities are based on unadjusted market prices in active markets, these securities are classified as Level 1. The fair values of U.S. government agency securities are determined using the spread above the risk-free yield curve. As the yields for the risk-free yield curve and the spreads are observable market inputs, the fair values of U.S. government agency securities are classified as Level 2.

Non-U.S. government

Non-U.S. government securities include bonds issued by non-U.S. governments and their agencies along with supranational organizations (collectively also known as sovereign debt securities). The fair values of these securities are based on prices obtained from international indices or valuation models that include inputs such as interest rate yield curves, cross-currency basis index spreads, and country credit spreads for structures similar to the sovereign bond in terms of issuer, maturity and seniority. As the significant inputs used to price these securities are observable market inputs, the fair values of non-U.S. government securities are classified as Level 2.

Corporate debt

Corporate debt securities consist primarily of investment-grade debt of a wide variety of corporate issuers and industries. The fair values of these securities are generally determined using the spread above the risk-free yield curve. These spreads are generally obtained from the new issue market, secondary trading and broker-dealer quotes. As the yields for the risk-free yield curve and the spreads are observable market inputs, the fair values of corporate debt securities are classified as Level 2. Where pricing is unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers to estimate fair value. This is generally the case when there is a low volume of trading activity and current transactions are not orderly. In this event, the fair values of these securities are classified as Level 3.

Agency RMBS

Agency RMBS consist of bonds issued by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation and the Government National Mortgage Association. The fair values of these securities are priced using a mortgage pool specific model which uses daily inputs from the active to be announced market and the spread associated with each mortgage pool based on vintage. As the significant inputs used to price these securities are observable market inputs, the fair values of Agency RMBS are classified as Level 2.

CMBS

CMBS include mostly investment-grade bonds originated by non-agencies. The fair values of these securities are determined using a pricing model which uses dealer quotes and other available trade information along with security level characteristics to determine deal specific spreads. As the significant inputs used to price these securities are observable market inputs, the fair values of CMBS securities are classified as Level 2. Where pricing is unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers to estimate fair value. This is generally the case when there is a low volume of trading activity and current transactions are not orderly. In this event, the fair values of these securities are classified as Level 3.

Non-Agency RMBS

Non-Agency RMBS include mostly investment-grade bonds originated by non-agencies. The fair values of these securities are determined using an option adjusted spread model or other relevant models, which use inputs including available trade information or broker quotes, prepayment and default projections based on historical statistics of the underlying collateral and current market data. As the significant inputs used to price these securities are observable market inputs, the fair values of Non-Agency RMBS are classified as Level 2.

ABS

ABS include mostly investment-grade bonds backed by pools of loans with a variety of underlying collateral, including auto loans, student loans, credit card receivables, CDOs and CLO debt originated by a variety of financial institutions. The fair values of these securities are determined using a model which uses prepayment speeds and spreads sourced primarily from the new issue market. As the significant inputs used to price these securities are observable market inputs, the fair values of ABS are classified as Level 2. Where pricing is unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers to estimate fair value. This is generally the case when there is a low volume of trading activity and current transactions are not orderly. In this event, the fair values of these securities are classified as Level 3.

Municipals

Municipals comprise revenue and general obligation bonds issued by U.S. domiciled state and municipal entities. The fair values of these securities are determined using spreads obtained from the new issue market, trade prices and broker-dealers quotes. As the significant inputs used to price these securities are observable market inputs, the fair values of municipals are classified as Level 2.

Equity Securities

Equity securities include common stocks, exchange-traded funds and bond mutual funds. As the fair values of common stocks and exchange-traded funds are based on unadjusted quoted market prices in active markets, these securities are classified as Level 1.

As bond mutual funds have daily liquidity with redemptions based on the Net Asset Values per share ("NAV") of the funds, the fair values of these securities are classified as Level 2.

Other Investments

Other privately held securities include convertible preferred shares, convertible notes and notes payable. These securities are initially valued at cost which approximates fair value. In subsequent measurement periods, the fair values of these securities are determined using an income approach valuation technique, specifically an internally developed discounted cash flow model. As the significant inputs used to price these securities are unobservable, the fair value of these securities are classified as Level 3.

Indirect investments in CLO-Equities are classified as Level 3 as the fair values of these securities are estimated using an income approach valuation technique, specifically an externally developed discounted cash flow model due to the lack of observable and relevant trades in secondary markets. Direct investments in CLO-Equities are also classified as Level 3 as the fair values of these securities are estimated using a liquidation valuation.

Overseas deposits include investments in private funds held by Syndicate 2007 where the underlying investments are primarily U.S. government, Non-U.S. government and corporate debt securities. The funds do not trade on an exchange therefore are not included within available for sale investments. As the significant inputs used to price the underlying investments are observable market inputs, the fair values of overseas deposits are classified as Level 2.

Short-Term Investments

Short-term investments primarily comprise highly liquid securities with maturities greater than three months but less than one year from the date of purchase. These securities are classified as Level 2 because these securities are typically not actively traded due to their approaching maturity and, as such, their amortized cost approximates fair value.

Derivative Instruments

Derivative instruments include foreign currency forward contracts, exchange traded interest rate swaps and commodity contracts that are customized to the Company's economic hedging strategies and trade in the over-the-counter derivative market. The fair values of these derivatives are determined using a market approach valuation technique based on significant observable market inputs from third party pricing vendors, non-binding broker-dealer quotes and/or recent trading activity. As the significant inputs used to price these securities are observable market inputs,, the fair values of these derivatives are classified as Level 2.

Other underwriting-related derivatives include insurance and reinsurance contracts that are accounted for as derivatives. These derivative contracts are initially valued at cost which approximates fair value. In subsequent measurement periods, the fair values of these derivatives are determined using an income approach valuation technique, specifically internally developed discounted cash flow models. As the significant inputs used to price these derivatives are unobservable, the fair values of these contracts are classified as Level 3.

Insurance-linked Securities

Insurance-linked securities comprise an investment in a catastrophe bond. As pricing is unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers to estimate the fair value of this security. Pricing is generally unavailable when there is a low volume of trading activity and current transactions are not orderly therefore the fair value of this security is classified as Level 3.

Cash Settled Awards

Cash settled awards comprise restricted stock units that form part of the Company's compensation program. Although the fair values of these awards are determined using observable quoted market prices in active markets, the restricted stock units are not actively traded. As the significant inputs used to price these securities are observable market inputs, the fair values of these liabilities are classified as Level 2.

The tables below present the financial instruments measured at fair value on a recurring basis for the periods indicated:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair value based on NAV practical expedient		Total Fair Value
At March 31, 2018
Assets
Fixed maturities
U.S. government and agency	$	1,769,810	$	27,155	$	—	$	—	$	1,796,965
Non-U.S. government	—		661,224		—		—		661,224
Corporate debt	—		4,596,960		43,471		—		4,640,431
Agency RMBS	—		1,914,845		—		—		1,914,845
CMBS	—		1,030,621		—		—		1,030,621
Non-Agency RMBS	—		41,397		—		—		41,397
ABS	—		1,566,698		—		—		1,566,698
Municipals	—		149,215		—		—		149,215
	1,769,810		9,988,115		43,471		—		11,801,396
Equity securities
Common stocks	23,942		—		—		—		23,942
Exchange-traded funds	262,630		—		—		—		262,630
Bond mutual funds	—		149,170		—		—		149,170
	286,572		149,170		—		—		435,742
Other investments
Hedge funds (1)	—		—		—		346,467		346,467
Direct lending funds	—		—		—		261,902		261,902
Private equity funds	—		—		—		65,811		65,811
Real estate funds	—		—		—		54,720		54,720
Other privately held investments	—		—		48,787		—		48,787
CLO-Equities	—		—		28,556		—		28,556
Overseas deposits	—		203,344		—		—		203,344
	—		203,344		77,343		728,900		1,009,587
Short-term investments	—		56,246		—		—		56,246
Other assets
Derivative instruments (see Note 5)	—		5,283		—		—		5,283
Insurance-linked securities	—		—		25,000		—		25,000
Total Assets	$	2,056,382	$	10,402,158	$	145,814	$	728,900	$	13,333,254
Liabilities
Derivative instruments (see Note 5)	$	—	$	3,439	$	10,942	$	—	$	14,381
Cash settled awards (see Note 8)	—		8,789		—		—		8,789
Total Liabilities	$	—	$	12,228	$	10,942	$	—	$	23,170

(1) Includes Long/short equity, Multi-strategy and Event-driven funds.

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair value based on NAV practical expedient		Total Fair Value
At December 31, 2017
Assets
Fixed maturities
U.S. government and agency	$	1,658,622	$	53,847	$	—	$	—	$	1,712,469
Non-U.S. government	—		806,299		—		—		806,299
Corporate debt	—		5,244,969		52,897		—		5,297,866
Agency RMBS	—		2,395,152		—		—		2,395,152
CMBS	—		777,728		—		—		777,728
Non-Agency RMBS	—		46,831		—		—		46,831
ABS	—		1,436,281		—		—		1,436,281
Municipals	—		149,380		—		—		149,380
	1,658,622		10,910,487		52,897		—		12,622,006
Equity securities
Common stocks	25,658		—		—		—		25,658
Exchange-traded funds	427,633		—		—		—		427,633
Bond mutual funds	—		182,220		—		—		182,220
	453,291		182,220		—		—		635,511
Other investments
Hedge funds (1)	—		—		—		363,811		363,811
Direct lending funds	—		—		—		250,681		250,681
Private equity funds	—		—		—		68,812		68,812
Real estate funds	—		—		—		50,009		50,009
Other privately held investments	—		—		46,430		—		46,430
CLO-Equities	—		—		31,413		—		31,413
Overseas deposits	—		198,217		—		—		198,217
	—		198,217		77,843		733,313		1,009,373
Short-term investments	—		83,661		—		—		83,661
Other assets
Derivative instruments (see Note 5)	—		5,125		—		—		5,125
Insurance-linked securities	—		—		25,090		—		25,090
Total Assets	$	2,111,913	$	11,379,710	$	155,830	$	733,313	$	14,380,766
Liabilities
Derivative instruments (see Note 5)	$	—	$	2,876	$	11,510	$	—	$	14,386
Cash settled awards (see Note 8)	—		21,535		—		—		21,535
Total Liabilities	$	—	$	24,411	$	11,510	$	—	$	35,921

(1) Includes Long/short equity, Multi-strategy and Event-driven funds.

During 2018 and 2017, the Company had no transfers between Levels 1 and 2.

Except certain fixed maturities and insurance-linked securities priced using broker-dealer quotes (underlying inputs are not available), the following table quantifies the significant unobservable inputs used in estimating fair values at March 31,2018 for investments classified as Level 3 in the fair value hierarchy.

	Fair Value			Valuation Technique	Unobservable Input	Range	Weighted Average
Other investments - CLO-Equities	$	27,118		Discounted cash flow	Default rates	3.0%	3.0%
					Loss severity rate	35.0%	35.0%
					Collateral spreads	3.0%	3.0%
					Estimated maturity dates	7 years	7 years
	$	1,438		Liquidation value	Fair value of collateral	100%	100%
					Discount margin	0.1% - 12.0%	2.1%
Other investments - Other privately held investments	$	48,787		Discounted cash flow	Discount rate	3.0% - 8.5%	7.2%
Derivatives - Other underwriting-related derivatives	$	(10,942	)	Discounted cash flow	Discount rate	2.7%	2.7%

The CLO-Equities market continues to be relatively inactive with only a small number of transactions being observed, particularly as it relates to transactions involving CLO-Equities held by the Company. Accordingly, fair values of investments in CLO-Equities are determined using models. Given that all of the Company's direct investments in CLO-Equities are past their reinvestment period, there is uncertainty regarding the remaining time until maturity. As such the Company's direct investments in CLO-Equities are estimated using a liquidation valuation. Indirect investments in CLO-Equities are valued using a discounted cash flow model prepared by an external investment manager.

The liquidation valuation is based on the fair values of the net underlying collateral which is determined by applying market discount margins by credit quality bucket. An increase (decrease) in the market discount margin would result in a decrease (increase) in value of the Company's CLO-Equities.

Regarding the discounted cash flow model, the default and loss severity rates are the most judgmental unobservable market inputs to which the valuation of CLO-Equities is most sensitive. A significant increase (decrease) in either of these significant inputs in isolation would result in lower (higher) fair value estimates for investments in CLO-Equities and, in general, a change in default rate assumptions would be accompanied by a directionally similar change in loss severity rate assumptions. Collateral spreads and estimated maturity dates are less judgmental inputs as they are based on the historical average of actual spreads and the weighted average life of the current underlying portfolios, respectively. A significant increase (decrease) in either of these significant inputs in isolation would result in higher (lower) fair value estimates for investments in CLO-Equities. In general, these inputs have no significant interrelationship with each other or with default and loss severity rates.

On a quarterly basis, the Company's valuation process for CLO-Equities includes a review of the underlying collateral along with related discount margins by credit quality bucket used in the liquidation valuation and a review of the underlying cash flows and key assumptions used in the discounted cash flow model. The above significant unobservable inputs are reviewed and updated based on information obtained from secondary markets, including information received from the managers of the Company's CLO-Equities portfolio. In order to assess the reasonableness of the inputs the Company uses in its models, the Company maintains an understanding of current market conditions, historical results, as well as emerging trends that may impact future cash flows. In addition, the assumptions the Company uses in its models are updated through regular communication with industry participants and ongoing monitoring of the deals in which the Company participates (e.g. default and loss severity rate trends).

Other privately held securities are initially valued at cost which approximates fair value. In subsequent measurement periods, the fair values of these securities are determined using internally developed discounted cash flow models. These models include inputs that are specific to each investment. The inputs used in the fair value measurements include dividend or interest rates and appropriate discount rates. The selection of an appropriate discount rate is judgmental and is the most significant unobservable input used in the valuation of these securities. A significant increase (decrease) in this input in isolation could result in significantly lower (higher) fair value measurement for other privately held securities. Where relevant, the Company also considers the contractual agreements which stipulate methodologies for calculating the dividend rate to be paid upon liquidation, conversion or redemption. In order to assess the reasonableness of the inputs that are used in the discounted cash flow models, the Company maintains an understanding of current market conditions, historical results, as well as investee specific information that may impact future cash flows.

Other underwriting-related derivatives are initially valued at cost which approximates fair value. In subsequent measurement periods, the fair values of these derivatives are determined using internally developed discounted cash flow models which uses appropriate discount rates. The selection of an appropriate discount rate is judgmental and is the most significant unobservable input used in the valuation of these derivatives. A significant increase (decrease) in this input in isolation could result in a significantly lower (higher) fair value measurement for the derivative contracts. In order to assess the reasonableness of the inputs the Company uses in the discounted cash flow model, the Company maintains an understanding of current market conditions, historical results, as well as contract specific information that may impact future cash flows.

The following tables present changes in Level 3 for financial instruments measured at fair value on a recurring basis for the periods indicated:

	Opening Balance		Transfers into Level 3		Transfers out of Level 3			Included in net income(1)			Included in OCI (2)		Purchases		Sales			Settlements/ Distributions			Closing Balance		Change in unrealized investment gains/(losses) (3)
Three months ended March 31, 2018
Fixed maturities
Corporate debt	$	52,897	$	—	$	(4,279	)	$	(118	)	$	1,403	$	—	$	(2,536	)	$	(3,896	)	$	43,471	$	—
CMBS	—		—		—			—			—		—		—			—			—		—
ABS	—		—		—			—			—		—		—			—			—		—
	52,897		—		(4,279		)	(118		)	1,403		—		(2,536		)	(3,896		)	43,471		—
Other investments
Other privately held investments	46,430		—		—			746			—		3,111		(1,500		)	—			48,787		746
CLO - Equities	31,413		—		—			1,616			—		—		—			(4,473		)	28,556		1,616
	77,843		—		—			2,362			—		3,111		(1,500		)	(4,473		)	77,343		2,362
Other assets
Derivative instruments	—		—		—			—			—		—		—			—			—		—
Insurance-linked securities	25,090		—		—			(90		)	—		—		—			—			25,000		(90		)
	25,090		—		—			(90		)	—		—		—			—			25,000		(90		)
Total assets	$	155,830	$	—	$	(4,279	)	$	2,154		$	1,403	$	3,111	$	(4,036	)	$	(8,369	)	$	145,814	$	2,272
Other liabilities
Derivative instruments	$	11,510	$	—	$	—		$	(568	)	$	—	$	—	$	—		$	—		$	10,942	$	(568	)
Total liabilities	$	11,510	$	—	$	—		$	(568	)	$	—	$	—	$	—		$	—		$	10,942	$	(568	)

	Opening Balance		Transfers into Level 3		Transfers out of Level 3			Included in net income(1)		Included in OCI (2)			Purchases		Sales			Settlements/ Distributions			Closing Balance		Change in unrealized investment gains/(losses) (3)
Three months ended March 31, 2017
Fixed maturities
Corporate debt	$	75,875	$	—	$	—		$	58	$	(47	)	$	5,964	$	(15,720	)	$	(2,342	)	$	63,788	$	—
CMBS	3,061		—		—			—		(3		)	9,400		—			(2,645		)	9,813		—
ABS	17,464		—		(18,948		)	—		1,484			—		—			—			—		—
	96,400		—		(18,948		)	58		1,434			15,364		(15,720		)	(4,987		)	73,601		—
Other investments
Other privately held investments	42,142		—		—			236		—			—		—			—			42,378		236
CLO - Equities	60,700		—		—			1,029		—			—		—			(7,337		)	54,392		1,029
	102,842		—		—			1,265		—			—		—			(7,337		)	96,770		1,265
Other assets
Derivative instruments	2,532		—		—			755		—			—		—			(90		)	3,197		755
Insurance-linked securities	25,023		—		—			3		—			—		—			—			25,026		3
	27,555		—		—			758		—			—		—			(90		)	28,223		758
Total assets	$	226,797	$	—	$	(18,948	)	$	2,081	$	1,434		$	15,364	$	(15,720	)	$	(12,414	)	$	198,594	$	2,023
Other liabilities
Derivative instruments	$	6,500	$	—	$	—		$	8,686	$	—		$	—	$	—		$	1,435		$	16,621	$	7,335
Total liabilities	$	6,500	$	—	$	—		$	8,686	$	—		$	—	$	—		$	1,435		$	16,621	$	7,335

(1) Realized gains (losses) on fixed maturities, and realized and unrealized gains (losses) on other assets and other liabilities included in net income are included in net investment gains (losses). Realized and unrealized gains and (losses) on other investments included in net income are included in net investment income.

(2) Unrealized gains (losses) on fixed maturities are included in other comprehensive income ("OCI").

(3) Change in unrealized investment gain (loss) relating to assets held at the reporting date.

The transfers into and out of fair value hierarchy levels reflect the fair value of the securities at the end of the reporting period.

Transfers into Level 3 from Level 2

There were no transfers to Level 3 from Level 2 made during the three months ended March 31, 2018 and 2017.

Transfers out of Level 3 into Level 2

The transfers into Level 2 from Level 3 made during the three months ended March 31, 2018 and 2017 were primarily due to the availability of observable market inputs and quotes from pricing vendors on certain fixed maturities.

Measuring the Fair Value of Other Investments Using Net Asset Valuations

The fair values of hedge funds, direct lending funds, private equity funds and real estate funds are estimated using NAVs as advised by external fund managers or third party administrators. For these funds, NAVs are based on the manager's or administrator's valuation of the underlying holdings in accordance with the fund's governing documents and in accordance with U.S. GAAP.

If there is a reporting lag between the current period end and reporting date of the latest available fund valuation for any hedge fund, the Company estimates fair values by starting with the most recently available fund valuation and adjusting for return estimates as well as any subscriptions, redemptions and distributions that took place during the current period. Return estimates are obtained from the relevant fund managers. Accordingly, the Company does not typically have a reporting lag in fair value measurements of these funds. Historically, the Company's valuation estimates incorporating these return estimates have not significantly diverged from the subsequently received NAVs.

For direct lending funds, private equity funds, real estate funds and two of the Company's hedge funds, valuation statements are typically released on a three month reporting lag therefore the Company estimates the fair value of these funds by starting with the prior quarter-end fund valuations and adjusting for capital calls, redemptions, drawdowns and distributions. Return estimates are not available from the relevant fund managers for these funds therefore the Company typically has a reporting lag in its fair value measurements of these funds. For the three months ended March 31,2018, funds reported on a lag represented 44% (2017: 44%) of the Company's total other investments balance.

The Company often does not have access to financial information relating to the underlying securities held within the funds, therefore management is unable to corroborate the fair values placed on the securities underlying the asset valuations provided by fund managers or fund administrators. In order to assess the reasonableness of the NAVs, the Company performs a number of monitoring procedures on a quarterly basis, to assess the quality of the information provided by fund managers and funds administrators. These procedures include, but are not limited to, regular review and discussion of each fund's performance with its manager, regular evaluation of fund performance against applicable benchmarks and the backtesting of the Company's fair value estimates against subsequently received NAVs. Backtesting involves comparing the Company's previously reported fair values for each fund against NAVs per audited financial statements (for year-end values) and final NAVs from fund managers and fund administrators (for interim values).

The fair values of hedge funds, direct lending funds, private equity funds and real estate funds are measured using the NAV practical expedient, therefore the fair values of these funds have not been categorized within the fair value hierarchy.

Financial Instruments Disclosed, But Not Carried, at Fair Value

The fair value of financial instruments accounting guidance also applies to financial instruments disclosed, but not carried, at fair value, except for certain financial instruments, including insurance contracts.

At March 31,2018, the carrying values of cash and cash equivalents including restricted amounts, accrued investment income, receivable for investments sold, certain other assets, payable for investments purchased and certain other liabilities approximated their fair values due to their respective short maturities. As these financial instruments are not actively traded, their fair values are classified as Level 2.

At March 31,2018, the carrying value of mortgage loans held-for-investment approximated their fair value. The fair values of mortgage loans are primarily determined by estimating expected future cash flows and discounting them using current interest rates for similar mortgage loans with similar credit risk, or are determined from pricing for similar loans. As mortgage loans are not actively traded their fair values are classified as Level 3.

At March 31,2018, senior notes are recorded at amortized cost with a carrying value of $1,377 million (2017: $1,341 million) and a fair value of $1,366 million (2017: $1,412 million). The fair values of these senior notes are based on prices obtained from a third party pricing service and are determined using the spread above the risk-free yield curve. These spreads are generally obtained from the new issue market, secondary trading and broker-dealer quotes. As these spreads and the yields for the risk-free yield curve are observable market inputs, the fair values of senior notes are classified as Level 2.

At March 31,2018, notes payable are recorded at amortized cost with a carrying value of $36 million and a fair value of $36 million. The fair values of the notes payable are primarily determined by estimating expected future cash flows and discounting them using current interest rates for notes payable with similar credit risk. As notes payables are not actively traded their fair values are classified as Level 3.

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DERIVATIVE INSTRUMENTS

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE INSTRUMENTS

The balance sheet classifications of derivatives recorded at fair value are shown in the following table. The notional amount of derivative contracts represents the basis upon which pay or receive amounts are calculated and are presented in the table to quantify the volume of the Company's derivative activities. Notional amounts are not reflective of credit risk.

None of the Company's derivative instruments are designated as hedges under current accounting guidance.

	March 31, 2018						December 31, 2017
	Derivative Notional Amount		Derivative Asset Fair Value(1)		Derivative Liability Fair Value(1)		Derivative Notional Amount		Derivative Asset Fair Value(1)		Derivative Liability Fair Value(1)
Relating to investment portfolio:
Foreign exchange forward contracts	$	120,762	$	146	$	161	$	137,422	$	10	$	619
Interest rate swaps	166,000		—		1,379		191,000		448		1,556
Relating to underwriting portfolio:
Foreign exchange forward contracts	649,919		5,137		1,899		698,959		4,667		701
Weather-related contracts	—		—		—		—		—		—
Other underwriting-related contracts	85,000		—		10,942		85,000		—		11,510
Total derivatives			$	5,283	$	14,381			$	5,125	$	14,386

(1) Asset and liability derivatives are classified within other assets and other liabilities in the Consolidated Balance Sheets.

Offsetting Assets and Liabilities

The Company's derivative instruments are generally traded under International Swaps and Derivatives Association master netting agreements, which establish terms that apply to all transactions. In the event of a bankruptcy or other stipulated event, master netting agreements provide that individual positions be replaced with a new amount, usually referred to as the termination amount, determined by taking into account market prices and converting into a single currency. Effectively, this contractual close-out netting reduces credit exposure from gross to net exposure. A reconciliation of gross derivative assets and liabilities to the net amounts presented in the Consolidated Balance Sheets, with the difference being attributable to the impact of master netting agreements, is shown in the following table.

	March 31, 2018							December 31, 2017
	Gross Amounts		Gross Amounts Offset			Net Amounts(1)		Gross Amounts		Gross Amounts Offset			Net Amounts(1)
Derivative assets	$	6,703	$	(1,420	)	$	5,283	$	8,178	$	(3,053	)	$	5,125
Derivative liabilities	$	15,801	$	(1,420	)	$	14,381	$	17,439	$	(3,053	)	$	14,386

(1) Net asset and liability derivatives are classified within other assets and other liabilities in the Consolidated Balance Sheets.

For information on reverse repurchase agreements see Note 3 'Investments'.

a) Relating to Investment Portfolio

Foreign Currency Risk

The Company's investment portfolio is exposed to foreign currency risk therefore the fair values of its investments are partially influenced by the change in foreign exchange rates. The Company may enter into foreign currency forward contracts to manage the effect of this foreign currency risk. These foreign currency hedging activities are not designated as specific hedges for financial reporting purposes.

Interest Rate Risk

The Company's investment portfolio contains a large percentage of fixed maturities which expose it to significant interest rate risk. As part of overall management of this risk, the Company may use interest rate swaps.

b) Relating to Underwriting Portfolio

Foreign Currency Risk

The Company's (re)insurance subsidiaries and branches operate in various countries. Some of its business is written in currencies other than the U.S. dollar, therefore the underwriting portfolio is exposed to significant foreign currency risk. The Company manages foreign currency risk by seeking to match its foreign-denominated net liabilities under (re)insurance contracts with cash and investments that are denominated in the same currencies. The Company may also use derivative instruments, specifically forward contracts and currency options, to economically hedge foreign currency exposures.

Weather Risk

During 2013, the Company began to write derivative-based risk management products designed to address weather risks with the objective of generating profits on a portfolio basis. The majority of this business consists of receiving a payment at contract inception in exchange for bearing the risk of variations in a quantifiable weather-related phenomenon, such as temperature. Where a client wishes to minimize the upfront payment, these transactions may be structured as swaps or collars. In general, the Company's portfolio of such derivative contracts is of short duration, with contracts being predominantly seasonal in nature. In order to economically hedge a portion of this portfolio, the Company may also purchase weather derivatives. Effective July 1, 2017, the Company no longer writes derivative-based risk management products which address weather risks.

Other Underwriting-related Risks

The Company enters into insurance and reinsurance contracts that are accounted for as derivatives. These insurance or reinsurance contracts provide indemnification to an insured or cedant as a result of a change in a variable as opposed to an identifiable insurable event. The Company considers these contracts to be part of its underwriting operations.

The total unrealized and realized gains (losses) recognized in net income for derivatives not designated as hedges are shown in the following table:

	Location of Gain (Loss) Recognized in Income on Derivative	Three months ended March 31,
		2018			2017
Relating to investment portfolio:
Foreign exchange forward contracts	Net investment gains (losses)	$	(1,191	)	$	(2,372	)
Interest rate swaps	Net investment gains (losses)	3,214			439
Relating to underwriting portfolio:
Foreign exchange forward contracts	Foreign exchange losses (gains)	7,768			(2,758		)
Weather-related contracts	Other insurance related income (losses)	—			(7,932		)
Other underwriting-related contracts	Other insurance related income (losses)	901			—
Total		$	10,692		$	(12,623	)

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RESERVE FOR LOSSES AND LOSS EXPENSES

3 Months Ended

Mar. 31, 2018

Insurance Loss Reserves [Abstract]

RESERVE FOR LOSSES AND LOSS EXPENSES

Reserve Roll-Forward

The following table presents a reconciliation of the Company's beginning and ending gross reserve for losses and loss expenses and net reserve for unpaid losses and loss expenses for the periods indicated:

	Three months ended March 31,
	2018			2017
Gross reserve for losses and loss expenses, beginning of period	$	12,997,553		$	9,697,827
Less reinsurance recoverable on unpaid losses, beginning of period	(3,159,514		)	(2,276,109		)
Net reserve for unpaid losses and loss expenses, beginning of period	9,838,039			7,421,718
Net incurred losses and loss expenses related to:
Current year	715,652			631,735
Prior years	(54,307		)	(24,793		)
	661,345			606,942
Net paid losses and loss expenses related to:
Current year	(48,814		)	(31,047		)
Prior years	(675,393		)	(521,478		)
	(724,207		)	(552,525		)
Foreign exchange and other	(726,781		)	36,797
Net reserve for unpaid losses and loss expenses, end of period	9,048,396			7,512,932
Reinsurance recoverable on unpaid losses, end of period	2,986,247			2,029,031
Gross reserve for losses and loss expenses, end of period	$	12,034,643		$	9,541,963

The Company writes business with loss experience generally characterized as low frequency and high severity in nature, which can result in volatility in its financial results. During the three months endedMarch 31, 2018, the Company recognized aggregate net losses and loss expenses of $35 million (2017: $35 million) attributable to catastrophe and weather-related events.

On January 1, 2018, AXIS Managing Agency Limited, the managing agent of Syndicate 2007 entered into an agreement for the RITC of the 2015 and prior years of account of Syndicate 2007. Under the terms of this agreement, the Company ceded $819 million of reserves for losses and loss expenses, which were included in Syndicate 2007's balance sheet at December 31, 2017, to a reinsurer. This agreement was accounted for as a novation reinsurance contract. During the three months ended March 31, 2018, the Company recognized a reduction in reserves for losses and loss expenses of $819 million representing the transfer of liabilities to the reinsurer, a reduction in investments and cash of $688 million representing the consideration paid to the reinsurer and a payable of $131 million representing the consideration due to the reinsurer.

The transfer of the insurance business of AXIS Specialty Australia to a reinsurer was approved by the Irish High Court on February 1, 2017 and the Federal Court of Australia on February 10, 2017. Consequently, the insurance policies, assets and liabilities of AXIS Specialty Australia were transferred to the reinsurer with effect from February 13, 2017. This resulted in the reduction of reserves for losses and loss expenses by $223 million and a reduction in reinsurance recoverables on unpaid and paid losses by $223 million.

Prior Year Development

Prior year reserve development arises from changes to loss and loss expense estimates related to loss events that occurred in previous calendar years. Such development is summarized by segment in the following table:

	Three months ended March 31,
	2018		2017
Insurance	$	22,775	$	7,865
Reinsurance	31,532		16,928
Total	$	54,307	$	24,793

The following tables reconcile reserve classes to the lines of business categories and the expected claim tails:

Insurance Segment
		Reported Lines of Business
Reserve Classes	Tail	Property	Marine	Terrorism	Aviation	Credit and Political Risk	Professional Lines	Liability	Accident and Health	Discontinued lines - Novae
Property and Other	Short	X		X					X	X
Marine	Short		X
Aviation	Short				X
Credit and Political Risk	Medium					X
Professional Lines	Medium						X			X
Liability	Long							X		X

Reinsurance Segment

Reported Lines of Business

Reserve Classes

Tail

Catastrophe

Property

Credit and Surety

Professional Lines

Motor

Liability

Engineering

Agriculture

Marine and Other

Accident and Health

Discontinued lines - Novae

Property and Other

Short

X

X

X

X

X

X

X

Credit and Surety

Medium

X

Professional Lines

Medium

X

Motor

Long

X

X

Liability

Long

X

X

Net favorable prior year reserve development for the three months endedMarch 31, 2018 included significant contributions from short and medium tail reserve classes. Net favorable prior year reserve development for the three months endedMarch 31, 2017 included significant contributions from medium and long tail reserve classes.

Short-tail business

Short-tail business includes the underlying exposures in property and other, marine and aviation reserve classes within the insurance segment, and the property and other reserve class within the reinsurance segment.

For the three months endedMarch 31, 2018, these reserve classes contributed $38 million (2017: $4 million) of net favorable prior year reserve development, primarily due to the recognition of better than expected loss emergence.

Medium-tail business

Medium-tail business consists primarily of insurance and reinsurance professional reserve classes, credit and political risk insurance reserve class and credit and surety reinsurance reserve class.

For the three months endedMarch 31, 2018, the reinsurance professional reserve class recognized $9 million (2017: $16 million) of net favorable prior year development. The net favorable prior year loss development on this reserve class continued to reflect the generally favorable experience on earlier accident years as the Company continued to transition to more experienced based methods.

For the three months endedMarch 31, 2018, the insurance professional reserve class recognized net favorable prior year development of $4 million (2017: $7 million). The net favorable prior year loss development on this reserve class reflected the generally favorable experience on earlier accident years as the Company transitions to more experienced based methods.

For the three months endedMarch 31, 2018, the credit and surety reinsurance reserve class recorded net favorable prior year reserve development of $5 million (2017: $nil) due to the recognition of generally better than expected loss emergence.

Long-tail business

Long-tail business consists primarily of liability and motor reserve classes.

For the three months endedMarch 31, 2018, reinsurance liability reserve class contributed net favorable prior year reserve development of $2 million (2017: $24 million). The net favorable prior year reserve development for the three months endedMarch 31, 2017 primarily reflected the progressively increased weight given by management to experience based indications on older accident years, which has generally been favorable.

For the three months endedMarch 31, 2018, the motor reinsurance reserve classes contributed net favorable prior year reserve development of $3 million (2017: net adverse prior year reserve development of $22 million). The net adverse prior year reserve development for the three months endedMarch 31, 2017 was primarily due to the decrease in the discount rate used to calculate lump sum awards in U.K. bodily injury cases, known as the Ogden Rate which changed from plus 2.5% to minus 0.75% effective March 20, 2017.

For the three months endedMarch 31, 2018, the insurance liability reserve class recorded net adverse prior year development of $7 million (2017: $4 million) primarily related to reserve strengthening within the Company's U.S. excess casualty business reflecting slightly higher than expected prior year emerging loss experience.

At March 31, 2018, net reserves for losses and loss expenses includes estimated amounts for numerous catastrophe events. The magnitude and/or complexity of losses arising from these events, in particular Hurricanes Harvey, Irma and Maria, the two earthquakes in Mexico and the wildfires in Northern and Southern California which occurred in 2017, inherently increase the level of uncertainty and, therefore, the level of management judgment involved in arriving at the estimated net reserves for losses and loss expenses. As a result, actual losses for these events may ultimately differ materially from our current estimates.

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EARNINGS PER COMMON SHARE

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

EARNINGS PER COMMON SHARE

The following table presents a comparison of basic and diluted earnings per common share:

	Three months ended March 31,
	2018		2017
Basic earnings per common share
Net income	$	73,202	$	19,855
Less: preferred share dividends	10,656		14,841
Net income available to common shareholders	62,546		5,014
Weighted average common shares outstanding - basic	83,322		86,022
Basic earnings per common share	$	0.75	$	0.06
Diluted earnings per common share
Net income available to common shareholders	$	62,546	$	5,014
Weighted average common shares outstanding - basic	83,322		86,022
Share-based compensation plans	399		771
Weighted average common shares outstanding - diluted	83,721		86,793
Diluted earnings per common share	$	0.75	$	0.06
Weighted average anti-dilutive shares excluded from the dilutive computation	810		551

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SHARE-BASED COMPENSATION

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

SHARE-BASED COMPENSATION

For the three months endedMarch 31,2018, the Company incurred share-based compensation costs of $16 million (2017: $29 million) related to restricted stock awards, share-settled restricted stock units, and cash-settled restricted stock units and recorded associated tax benefits of $2 million (2017: $7 million).

The fair value of share-settled restricted stock units and cash-settled restricted stock units that vested during the three months endedMarch 31,2018 was $42 million (2017: $120 million, which included $44 million attributable to a grant of three year cliff vesting service-based awards made in 2014). At March 31,2018 there were $137 million of unrecognized compensation costs (2017: $130 million), which are expected to be recognized over the weighted average period of 3.0 years.

Share-settled Awards

The following table provides a summary of nonvested share settled restricted stock units for the three months endedMarch 31,2018:

	Share Settled Performance Vesting Restricted Stock Units				Share Settled - Service Based Restricted Stock Units
	Number of Restricted Stock Units		Weighted  Average Grant Date Fair Value(1)		Number of Restricted Stock Units		Weighted  Average Grant Date Fair Value(1)
Nonvested restricted stock units - beginning of period	230		$	57.08	1,355		$	57.09
Granted	104		48.89		711		49.07
Vested	(51	)	53.81		(455	)	54.44
Forfeited	—		—		(20	)	57.45
Nonvested restricted stock units - end of period	283		$	54.68	1,591		$	54.18

(1) Fair value is based on the closing price of our common shares on the grant approval date.

Cash-settled awards

The following table provides a summary of nonvested cash settled restricted stock units for the three months endedMarch 31,2018:

	Cash Settled Performance Vesting Restricted Stock Units		Cash Settled Service-based Restricted Stock Units
	Number of Restricted Stock Units		Number of Restricted Stock Units
Nonvested restricted stock units - beginning of period	42		988
Granted	—		449
Vested	(12	)	(360	)
Forfeited	—		(20	)
Nonvested restricted stock units - end of period	30		1,057

At March 31,2018, the liability for cash-settled restricted stock units, included in other liabilities in the Consolidated Balance Sheets, was $9 million (2017: $9 million).

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SHAREHOLDERS' EQUITY

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

SHAREHOLDERS' EQUITY

The following table presents common shares issued and outstanding:

	Three months ended March 31,
	2018		2017
Shares issued, balance at beginning of period	176,580		176,580
Shares issued	—		—
Total shares issued at end of period	176,580		176,580
Treasury shares, balance at beginning of period	(93,419	)	(90,139	)
Shares repurchased	(149	)	(2,229	)
Shares reissued	506		958
Total treasury shares at end of period	(93,062	)	(91,410	)
Total shares outstanding	83,518		85,170

Treasury Shares

The following table presents share repurchases:

	Three months ended March 31,
	2018		2017
In the open market:
Total shares	—		1,896
Total cost	$	—	$	127,982
Average price per share(1)	$	—	$	67.52
From employees:(2)
Total shares	149		333
Total cost	$	7,163	$	23,260
Average price per share(1)	$	48.08	$	69.80
Total shares repurchased:
Total shares	149		2,229
Total cost	$	7,163	$	151,242
Average price per share(1)	$	48.08	$	67.86

(1) Calculated using whole numbers.

(2) Shares are repurchased from employees to satisfy withholding tax liabilities upon the vesting of restricted stock awards and restricted stock units.

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DEBT AND FINANCING ARRANGEMENTS

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

DEBT AND FINANCING ARRANGEMENTS

On March 28, 2018, certain of AXIS Capital’s operating subsidiaries (the "Participating Subsidiaries") amended their existing $250 million secured letter of credit facility with Citibank Europe plc (the "$250 Million Facility") under their aggregate $750 million secured letter of credit facility with Citibank Europe plc (the "$750 Million Facility") to extend the expiration date to March 31, 2019.

The terms and conditions of the additional $500 million secured letter of credit facility under the $750 Million Facility remain unchanged. The $500 million secured letter of credit facility expires December 31, 2019.

Letters of credit issued under the $750 Million Facility will principally be used to support the reinsurance obligations of the Participating Subsidiaries. The Participating Subsidiaries are subject to certain covenants, including the requirement to maintain sufficient collateral to cover obligations outstanding under the $750 Million Facility. In the event of default, Citibank Europe plc may exercise certain remedies, including the exercise of control over pledged collateral and the termination of the availability of the $750 Million Facility to any or all of the Participating Subsidiaries.

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COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Legal Proceedings

From time to time, the Company is subject to routine legal proceedings, including arbitrations, arising in the ordinary course of business. These legal proceedings generally relate to claims asserted by or against the Company in the ordinary course of insurance or reinsurance operations. Estimated amounts payable under such proceedings are included in the reserve for losses and loss expenses in the Consolidated Balance Sheets.

The Company is not party to any material legal proceedings arising outside the ordinary course of business.

Investments

Refer to Note 3 - 'Investments' for information on the Company's unfunded investment commitments related to the Company's other investment portfolio.

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OTHER COMPREHENSIVE INCOME (LOSS)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

OTHER COMPREHENSIVE INCOME (LOSS)

The tax effects allocated to each component of other comprehensive income (loss) are shown in the following table:

	2018									2017
	Before Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Before Tax Amount		Tax (Expense) Benefit			Net of Tax Amount
Three months ended March 31,
Available for sale investments:
Unrealized investment gains (losses) arising during the period	$	(105,675	)	$	(6,516	)	$	(112,191	)	$	70,372	$	(2,669	)	$	67,703
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	(4,112		)	4,897			785			25,759		(791		)	24,968
Unrealized investment gains (losses) arising during the period, net of reclassification adjustment(1)	(109,787		)	(1,619		)	(111,406		)	96,131		(3,460		)	92,671
Foreign currency translation adjustment	1,270			—			1,270			29,869		—			29,869
Total other comprehensive income (loss), net of tax	$	(108,517	)	$	(1,619	)	$	(110,136	)	$	126,000	$	(3,460	)	$	122,540

(1) Effective January 1, 2018, the Company adopted ASU No. 2016-01. The adoption of this guidance resulted in a cumulative adjustment to reclassify unrealized investment gains on equity securities from accumulated other comprehensive income to retained earnings. As prescribed, the prior period has not been restated to conform to the current presentation. Refer to Item 1, Note 1 'Basis of Presentation and Significant Accounting Policies' to the Consolidated Financial Statements for additional information.

Reclassifications from AOCI to net income available to common shareholders are shown in the following table:

		Amount Reclassified from AOCI(1)
Details About AOCI Components	Consolidated Statement of Operations Line Item That Includes Reclassification	Three months ended March 31,
		2018			2017
Unrealized investment gains (losses) on available for sale investments
	Other investment gains (losses)	$	4,526		$	(19,206	)
	OTTI losses	(414		)	(6,553		)
	Total before tax	4,112			(25,759		)
	Income tax (expense) benefit	(4,897		)	791
	Net of tax	$	(785	)	$	(24,968	)
Foreign currency translation adjustment
	Foreign exchange loss	$	—		$	(24,149	)
	Income tax (expense) benefit	—			—
	Net of tax	$	—		$	(24,149	)

(1) Amounts in parentheses are debits to net income (loss) available to common shareholders.

On March 27, 2017, as part of the wind down of our Australia operation, the Australia Prudential Regulation Authority revoked the authorization of AXIS Specialty Australia to carry on insurance business in Australia. As this resulted in the substantial liquidation of AXIS Specialty Australia, we have released the cumulative translation adjustment related to AXIS Specialty Australia of $24 million from accumulated other comprehensive income in the Consolidated Balance Sheet to foreign exchange losses in the Consolidated Statement of Operations.

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SUBSEQUENT EVENTS

3 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

On April 16 2018, the Company entered into a quota share and adverse development cover reinsurance agreement, a retroactive

contract which was deemed to have met the established criteria for retroactive reinsurance accounting. The Company will recognize reinsurance recoverable on unpaid losses of $108 million related to this reinsurance agreement.

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

These unaudited Consolidated Financial Statements (the "financial statements") have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") for interim financial information and with the U.S. Securities and Exchange Commission's ("SEC") instructions to Form 10-Q and Article 10 of Regulation S-X and include AXIS Capital Holdings Limited ("AXIS Capital") and its subsidiaries (the "Company"). Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. This Quarterly Report on Form 10-Q should be read in conjunction with the financial statements and related notes included in AXIS Capital's Annual Report on Form 10-K for the year ended December 31, 2017, as filed with the SEC.

In the opinion of management, these financial statements reflect all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the Company's financial position and results of operations for the periods presented.

The results of operations for any interim period are not necessarily indicative of the results for a full year. All inter-company accounts and transactions have been eliminated.

To facilitate comparison of information across periods, certain reclassifications have been made to prior year amounts to conform to the current year's presentation. These reclassifications did not impact results of operations, financial condition or liquidity.

Tabular dollar and share amounts are in thousands, except per share amounts. All amounts are reported in U.S. dollars.

New Accounting Standards

a) Investments

Recognition and Measurement of Financial Assets and Financial Liabilities

Fixed maturities and equity securities are reported at fair value at the balance sheet date (see Note 4 'Fair Value Measurements'). Effective January 1, 2018, the Company adopted ASU 2016-01 "Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities," which requires:

• equity investments (except those accounted for under the equity method of accounting, investments that are consolidated or those that meet a practicability exception) to be measured at fair value with changes in fair value recognized in net income,

• simplifies the impairment assessment of equity investments without readily determinable values by requiring a qualitative assessment to identify impairment, eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost,

• requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes,

• requires separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the organization has elected to measure the liabilities in accordance with the fair value option,

• requires the separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and

• clarifies that the reporting organization should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the organization’s other deferred tax assets.

Upon adoption of this guidance, net unrealized gains on equity securities of $70 million, net of deferred income taxes of $13 million, were reclassified from accumulated other comprehensive income into retained earnings. As prescribed, the prior period has not been restated to conform to the current presentation.

New Accounting Standards Adopted in 2018

Revenue From Contracts With Customers

Effective January 1, 2018, the Company adopted Accounting Standards Update ("ASU" ) 2014-09 "Revenue from Contracts with Customers (Topic 606)," using the modified retrospective transition approach. This guidance affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards, such as accounting for insurance contracts. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.

The Company generated fee income of $10 million for the three months ended March 31, 2018 which is within the scope of this ASU. These fees represents service fees and reimbursement of expenses earned by the Company's reinsurance segment related to services provided to its strategic capital partners. These fees are recognized when the related services have been performed and are reported in other insurance related income (losses) in the Consolidated Statements of Operations. Given that the timing and measurement of revenue associated with impacted contracts did not change, the adoption of this guidance did not have a material impact on the Company's results of operations, financial condition and liquidity.

Classification of Certain Cash Receipts and Cash Payments

Effective January 1, 2018, the Company adopted ASU 2016-15, "Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments," which addresses diversity in practice in how eight specific cash receipts and cash payments should be presented and classified on the statement of cash flows. The adoption of this guidance did not impact the Company's results of operations, financial condition and liquidity.

Restricted Cash

Effective January 1, 2018, the Company adopted ASU 2016-18, "Statement of Cash Flows (Topic 230) - Restricted Cash," which addresses diversity in practice in the classification and presentation of changes in restricted cash on the statement of cash flows. This guidance requires a statement of cash flows to explain the change during the period in the total of cash, cash equivalents, restricted cash and restricted cash equivalents. Transfers between cash and cash equivalents and restricted cash and restricted cash equivalents will no longer be presented on the statement of cash flows. To facilitate comparison of the Company's Consolidated Statements of Cash Flows, the Company adopted this guidance utilizing the full retrospective approach for all periods presented in the Company's Consolidated Financial Statements. As a result, the Company's Consolidated Statements of Cash Flows now explains the change during the period in the total of cash, cash equivalents, and restricted cash. Therefore, restricted cash is now included with cash and cash equivalents in the reconciliation of the beginning of period and end of period total amounts shown on the statement of cash flows. The adoption of this guidance did not impact the Company's results of operations, financial condition and liquidity.

Stock Compensation - Scope of Modification Accounting

Effective January 1, 2018, the Company adopted ASU 2017-09 "Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting," which provides clarity and reduces diversity in practice of applying the guidance in Topic 718 to a change to the terms or conditions of a share-based payment award. This ASU provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The guidance states that an entity should account for the effects of a modification unless all the following are met:

1. the fair value of the modified award is the same as the fair value of the original award immediately before the original award is modified;

2. the vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified; and the classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified.

The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this Update. The adoption of this guidance did not impact the Company's results of operations, financial condition and liquidity.

Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

Effective January 1, 2018, the Company adopted ASU 2018-02 "Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" which was a response to a financial reporting issue that arose as a consequence of the U.S. federal government tax bill, H.R.1, An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018 ("U.S. Tax Reform"), which was enacted on December 22, 2017.

U.S. GAAP currently requires deferred tax liabilities and assets to be adjusted for the effect of a change in tax laws or rates with the effect included in income from continuing operations in the reporting period that includes the enactment date. This guidance is applicable even in situations in which the related income tax effects of items in accumulated other comprehensive income were originally recognized in other comprehensive income rather than in income from continuing operations. As the adjustment of deferred taxes due to the reduction of the historical corporate income tax rate to the newly enacted corporate income tax rate is required to be included in income from continuing operations, the tax effects of items within accumulated other comprehensive income (referred to as stranded tax effects for purposes of this Update) do not reflect the appropriate tax rate.

The amendments in this Update allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from U.S. Tax Reform. Consequently, the amendments eliminate the stranded tax effects resulting from U.S. Tax Reform and will improve the usefulness of information reported to financial statement users. However, because the amendments only relate to the reclassification of the income tax effects of U.S. Tax Reform, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected.

As a consequence of U.S. Tax Reform, the Company recognized a tax benefit of $2 million related to the revaluation of net deferred tax liabilities associated with the reduction in the U.S. corporate income tax rate from 35% to 21%, attributable to net unrealized investment gains associated with investments held by the Company's U.S. domiciled entities. Upon adoption of this guidance, the tax benefit of $2 million was reclassified from accumulated other comprehensive income into retained earnings.

Recently Issued Accounting Standards Not Yet Adopted

Leases

In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)" which provides a new comprehensive model for lease accounting. The guidance will require a lessee to recognize a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the impact of this guidance on the Company's results of operations, financial condition and liquidity.

Measurement of Credit Losses on Financial Instrument

In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments" which replaces the "incurred loss" impairment methodology with an approach based on "expected losses" to estimate credit losses on certain types of financial instruments and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The guidance requires financial assets measured at amortized cost to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost of the financial asset to present the net carrying value at the amount expected to be collected on the financial asset. Credit losses relating to available-for-sale debt securities will be recorded through an allowance for credit losses. The guidance also provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. This guidance is effective for interim and annual periods beginning after December 15, 2019. Early adoption is permitted for interim and annual periods beginning after December 15, 2018. The Company is currently evaluating the impact of this guidance on its results of operations, financial condition and liquidity.

Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment" that eliminates the requirement to calculate the implied fair value of goodwill (i.e., Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, an impairment charge will be based on the excess of a reporting unit's carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current goodwill impairment test). This guidance is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019, with early adoption permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The guidance will be adopted on a prospective basis.

Premium Amortization on Purchased Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08 "Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20) - Premium Amortization on Purchased Callable Debt Securities" which shortens the amortization period for certain purchased callable debt securities held at a premium. This guidance is effective for interim and annual reporting periods, beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the impact of this guidance on our results of operations, financial condition and liquidity.

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SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

UNDERWRITING RESULTS OF REPORTABLE SEGMENTS

The following tables present the underwriting results of the Company's reportable segments, as well as the carrying values of allocated goodwill and intangible assets:

	2018									2017
Three months ended and at March 31,	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written	$	880,848		$	1,781,947		$	2,662,795		$	545,261		$	1,366,610		$	1,911,871
Net premiums written	547,893			1,437,978			1,985,871			356,836			1,152,122			1,508,959
Net premiums earned	580,059			587,343			1,167,402			391,964			546,739			938,703
Other insurance related income (losses)	620			5,986			6,606			42			(3,825		)	(3,783		)
Net losses and loss expenses	(321,538		)	(339,807		)	(661,345		)	(241,085		)	(365,857		)	(606,942		)
Acquisition costs	(87,329		)	(141,931		)	(229,260		)	(54,004		)	(135,788		)	(189,792		)
General and administrative expenses	(102,370		)	(37,296		)	(139,666		)	(85,256		)	(36,545		)	(121,801		)
Underwriting income	$	69,442		$	74,295		143,737			$	11,661		$	4,724		16,385
Corporate expenses							(30,171		)							(39,459		)
Net investment income							100,999									98,664
Net investment losses							(14,830		)							(25,050		)
Foreign exchange losses							(37,860		)							(21,465		)
Interest expense and financing costs							(16,763		)							(12,791		)
Reorganization expenses							(13,054		)							—
Amortization of value of business acquired							(57,110		)							—
Amortization of intangibles							(2,782		)							—
Income before income taxes and interest in income (loss) of equity method investments							$	72,166								$	16,284
Net loss and loss expense ratio	55.4		%	57.9		%	56.7		%	61.5		%	66.9		%	64.7		%
Acquisition cost ratio	15.1		%	24.2		%	19.6		%	13.8		%	24.8		%	20.2		%
General and administrative expense ratio	17.6		%	6.3		%	14.5		%	21.8		%	6.7		%	17.2		%
Combined ratio	88.1		%	88.4		%	90.8		%	97.0		%	98.4		%	102.1		%
Goodwill and intangible assets	$	506,747		$	—		$	506,747		$	84,613		$	—		$	84,613

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INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

AMORTIZED COST/COST AND FAIR VALUES OF FIXED MATURITIES AND EQUITIES

The amortized cost and fair values of the Company's fixed maturities classified as available for sale were as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Non-credit OTTI in AOCI(5)
At March 31, 2018
Fixed maturities
U.S. government and agency	$	1,821,951	$	908	$	(25,894	)	$	1,796,965	$	—
Non-U.S. government	649,396		21,084		(9,256		)	661,224		—
Corporate debt	4,670,815		40,698		(71,082		)	4,640,431		—
Agency RMBS(1)	1,956,394		4,644		(46,193		)	1,914,845		—
CMBS(2)	1,042,704		1,964		(14,047		)	1,030,621		—
Non-Agency RMBS	39,930		1,997		(530		)	41,397		(866		)
ABS(3)	1,566,484		4,932		(4,718		)	1,566,698		—
Municipals(4)	150,386		781		(1,952		)	149,215		—
Total fixed maturities	$	11,898,060	$	77,008	$	(173,672	)	$	11,801,396	$	(866	)
At December 31, 2017
Fixed maturities
U.S. government and agency	$	1,727,643	$	1,735	$	(16,909	)	$	1,712,469	$	—
Non-U.S. government	798,582		17,240		(9,523		)	806,299		—
Corporate debt	5,265,795		61,922		(29,851		)	5,297,866		—
Agency RMBS(1)	2,414,720		8,132		(27,700		)	2,395,152		—
CMBS(2)	776,715		4,138		(3,125		)	777,728		—
Non-Agency RMBS	45,713		1,917		(799		)	46,831		(853		)
ABS(3)	1,432,884		5,391		(1,994		)	1,436,281		—
Municipals(4)	149,167		1,185		(972		)	149,380		—
Total fixed maturities	$	12,611,219	$	101,660	$	(90,873	)	$	12,622,006	$	(853	)

(1) Residential mortgage-backed securities ("RMBS") originated by U.S. government-sponsored agencies.

(2) Commercial mortgage-backed securities ("CMBS").

(3) Asset-backed securities (ABS) include debt tranched securities collateralized primarily by auto loans, student loans, credit card receivables collateralized debt obligations ("CDOs") and collateralized loan obligations ("CLOs").

(4) Municipals include bonds issued by states, municipalities and political subdivisions.

(5) Represents the non-credit component of the other-than-temporary impairment ("OTTI") losses, adjusted for subsequent sales, maturities and redemptions. It does not include the change in fair value subsequent to the impairment measurement date.

EQUITY SECURITIES

The cost and fair values of the Company's equity securities were as follows:

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
At March 31, 2018
Equity securities
Common stocks	$	23,251	$	1,668	$	(977	)	$	23,942
Exchange-traded funds	211,301		51,843		(514		)	262,630
Bond mutual funds	139,539		9,631		—			149,170
Total equity securities	$	374,091	$	63,142	$	(1,491	)	$	435,742
At December 31, 2017
Equity securities
Common stocks	$	22,836	$	3,412	$	(590	)	$	25,658
Exchange-traded funds	356,252		71,675		(294		)	427,633
Bond mutual funds	173,779		9,440		(999		)	182,220
Total equity securities	$	552,867	$	84,527	$	(1,883	)	$	635,511

CONTRACTUAL MATURITIES OF FIXED MATURITIES

Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The contractual maturities of fixed maturities are shown below:

	Amortized Cost		Fair Value		% of Total Fair Value
At March 31, 2018
Maturity
Due in one year or less	$	513,226	$	507,980	4.3	%
Due after one year through five years	4,642,999		4,626,323		39.2	%
Due after five years through ten years	1,942,501		1,911,664		16.2	%
Due after ten years	193,822		201,868		1.7	%
	7,292,548		7,247,835		61.4	%
Agency RMBS	1,956,394		1,914,845		16.2	%
CMBS	1,042,704		1,030,621		8.7	%
Non-Agency RMBS	39,930		41,397		0.4	%
ABS	1,566,484		1,566,698		13.3	%
Total	$	11,898,060	$	11,801,396	100.0	%
At December 31, 2017
Maturity
Due in one year or less	$	486,659	$	484,663	3.8	%
Due after one year through five years	4,906,207		4,912,189		38.9	%
Due after five years through ten years	2,338,964		2,350,433		18.6	%
Due after ten years	209,357		218,729		1.7	%
	7,941,187		7,966,014		63.0	%
Agency RMBS	2,414,720		2,395,152		19.0	%
CMBS	776,715		777,728		6.2	%
Non-Agency RMBS	45,713		46,831		0.4	%
ABS	1,432,884		1,436,281		11.4	%
Total	$	12,611,219	$	12,622,006	100.0	%

FIXED MATURITIES AND EQUITIES IN AN UNREALIZED LOSS POSITION

The following table summarizes fixed maturities and equity securities in an unrealized loss position and the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:

	12 months or greater					Less than 12 months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
At March 31, 2018(1)
Fixed maturities
U.S. government and agency	$	179,214	$	(7,184	)	$	1,219,143	$	(18,710	)	$	1,398,357	$	(25,894	)
Non-U.S. government	47,017		(4,693		)	214,545		(4,563		)	261,562		(9,256		)
Corporate debt	335,415		(15,212		)	2,853,336		(55,870		)	3,188,751		(71,082		)
Agency RMBS	603,008		(24,241		)	1,011,088		(21,952		)	1,614,096		(46,193		)
CMBS	29,098		(1,272		)	684,264		(12,775		)	713,362		(14,047		)
Non-Agency RMBS	8,089		(453		)	108,548		(77		)	116,637		(530		)
ABS	43,804		(455		)	547,077		(4,263		)	590,881		(4,718		)
Municipals	11,101		(375		)	93,140		(1,577		)	104,241		(1,952		)
Total fixed maturities	$	1,256,746	$	(53,885	)	$	6,731,141	$	(119,787	)	$	7,987,887	$	(173,672	)
At December 31, 2017
Fixed maturities
U.S. government and agency	$	194,916	$	(5,963	)	$	1,389,792	$	(10,946	)	$	1,584,708	$	(16,909	)
Non-U.S. government	62,878		(6,806		)	204,110		(2,717		)	266,988		(9,523		)
Corporate debt	407,300		(11,800		)	2,041,845		(18,051		)	2,449,145		(29,851		)
Agency RMBS	759,255		(17,453		)	1,172,313		(10,247		)	1,931,568		(27,700		)
CMBS	31,607		(703		)	348,943		(2,422		)	380,550		(3,125		)
Non-Agency RMBS	8,029		(788		)	4,197		(11		)	12,226		(799		)
ABS	57,298		(570		)	392,170		(1,424		)	449,468		(1,994		)
Municipals	11,230		(269		)	65,632		(703		)	76,862		(972		)
Total fixed maturities	$	1,532,513	$	(44,352	)	$	5,619,002	$	(46,521	)	$	7,151,515	$	(90,873	)
Equity securities
Common stocks	$	—	$	—		$	3,202	$	(590	)	$	3,202	$	(590	)
Exchange-traded funds	—		—			12,323		(294		)	12,323		(294		)
Bond mutual funds	—		—			12,184		(999		)	12,184		(999		)
Total equity securities	$	—	$	—		$	27,709	$	(1,883	)	$	27,709	$	(1,883	)

(1) Effective January 1, 2018, the Company adopted ASU No. 2016-01 which requires equity securities to be measured at fair value with changes in fair value recognized in net income therefore equity securities at fair value are excluded from the table above at March 31, 2018.

MORTGAGE LOANS NET OF VALUATION ALLOWANCE

The following table provides a breakdown of the Company's mortgage loans held-for-investment:

	March 31, 2018				December 31, 2017
	Carrying Value		% of Total		Carrying Value		% of Total
Mortgage Loans held-for-investment:
Commercial	$	364,769	100	%	$	325,062	100	%
	364,769		100	%	325,062		100	%
Valuation allowances	—		—	%	—		—	%
Total Mortgage Loans held-for-investment	$	364,769	100	%	$	325,062	100	%

PORTFOLIO OF OTHER INVESTMENTS

The following tables provide a breakdown of the Company's other investments, together with additional information relating to the liquidity of each category:

	Fair Value				Redemption Frequency (if currently eligible)	Redemption     Notice Period
At March 31, 2018
Long/short equity funds	$	25,489	3	%	Annually	60 days
Multi-strategy funds	283,298		28	%	Quarterly, Semi-annually	60-95 days
Event-driven funds	37,680		4	%	Annually	45 days
Direct lending funds	261,902		26	%	n/a	n/a
Private equity funds	65,811		7	%	n/a	n/a
Real estate funds	54,720		5	%	n/a	n/a
CLO-Equities	28,556		2	%	n/a	n/a
Other privately held investments	48,787		5	%	n/a	n/a
Overseas deposits	203,344		20	%	n/a	n/a
Total other investments	$	1,009,587	100	%
At December 31, 2017
Long/short equity funds	$	38,470	4	%	Annually	60 days
Multi-strategy funds	286,164		28	%	Quarterly, Semi-annually	60-95 days
Event-driven funds	39,177		4	%	Annually	45 days
Direct lending funds	250,681		25	%	n/a	n/a
Private equity funds	68,812		7	%	n/a	n/a
Real estate funds	50,009		5	%	n/a	n/a
CLO-Equities	31,413		2	%	n/a	n/a
Other privately held investments	46,430		5	%	n/a	n/a
Overseas deposits	198,217		20	%	n/a	n/a
Total other investments	$	1,009,373	100	%

n/a -notapplicable

NET INVESTMENT INCOME

Net investment income was derived from the following sources:

	Three months ended March 31,
	2018			2017
Fixed maturities	$	83,958		$	77,407
Other investments	13,704			18,962
Equity securities	1,758			3,478
Mortgage loans	3,125			2,477
Cash and cash equivalents	4,153			3,095
Short-term investments	875			438
Gross investment income	107,573			105,857
Investment expenses	(6,574		)	(7,193		)
Net investment income	$	100,999		$	98,664

NET REALIZED INVESTMENT GAINS (LOSSES)

The following table provides an analysis of net investment losses:

	Three months ended March 31,
	2018			2017
Gross realized investment gains
Fixed maturities and short-term investments	$	31,628		$	20,777
Equity securities	17,557			15,783
Gross realized investment gains	49,185			36,560
Gross realized investment losses
Fixed maturities and short-term investments	(43,535		)	(52,935		)
Equity securities	(1,276		)	(189		)
Gross realized investment losses	(44,811		)	(53,124		)
Net OTTI recognized in net income	(414		)	(6,553		)
Change in fair value of investment derivatives(1)	2,023			(1,933		)
Net unrealized gains (losses) on equity securities(2)	(20,813		)	—
Net investment losses	$	(14,830	)	$	(25,050	)

(1) Refer to Note 5 'Derivative Instruments'.

(2) Effective January 1, 2018, the Company adopted ASU No. 2016-01.  The change in fair value of equity securities is now recognized in net investment losses.

OTTI RECOGNIZED IN EARNINGS BY ASSET CLASS

The following table summarizes the OTTI recognized in net income by asset class:

	Three months ended March 31,
	2018		2017
Fixed maturities:
Non-U.S. government	$	—	$	4,282
Corporate debt	414		2,271
Total OTTI recognized in net income	$	414	$	6,553

ROLL FORWARD OF CREDIT LOSSES FOR WHICH A PORTION OF OTTI RECOGNIZED IN AOCI

The following table provides a roll forward of the credit losses ("credit loss table"), before income taxes, for which a portion of the OTTI was recognized in AOCI:

	Three months ended March 31,
	2018			2017
Balance at beginning of period	$	1,494		$	1,493
Credit impairments recognized on securities not previously impaired	—			—
Additional credit impairments recognized on securities previously impaired	—			—
Change in timing of future cash flows on securities previously impaired	—			—
Intent to sell of securities previously impaired	—			—
Securities sold/redeemed/matured	(10		)	(10		)
Balance at end of period	$	1,484		$	1,483

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FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

FINANCIAL INSTRUMENTS MEASURED AT FAIR VALUE ON A RECURRING BASIS

The tables below present the financial instruments measured at fair value on a recurring basis for the periods indicated:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair value based on NAV practical expedient		Total Fair Value
At March 31, 2018
Assets
Fixed maturities
U.S. government and agency	$	1,769,810	$	27,155	$	—	$	—	$	1,796,965
Non-U.S. government	—		661,224		—		—		661,224
Corporate debt	—		4,596,960		43,471		—		4,640,431
Agency RMBS	—		1,914,845		—		—		1,914,845
CMBS	—		1,030,621		—		—		1,030,621
Non-Agency RMBS	—		41,397		—		—		41,397
ABS	—		1,566,698		—		—		1,566,698
Municipals	—		149,215		—		—		149,215
	1,769,810		9,988,115		43,471		—		11,801,396
Equity securities
Common stocks	23,942		—		—		—		23,942
Exchange-traded funds	262,630		—		—		—		262,630
Bond mutual funds	—		149,170		—		—		149,170
	286,572		149,170		—		—		435,742
Other investments
Hedge funds (1)	—		—		—		346,467		346,467
Direct lending funds	—		—		—		261,902		261,902
Private equity funds	—		—		—		65,811		65,811
Real estate funds	—		—		—		54,720		54,720
Other privately held investments	—		—		48,787		—		48,787
CLO-Equities	—		—		28,556		—		28,556
Overseas deposits	—		203,344		—		—		203,344
	—		203,344		77,343		728,900		1,009,587
Short-term investments	—		56,246		—		—		56,246
Other assets
Derivative instruments (see Note 5)	—		5,283		—		—		5,283
Insurance-linked securities	—		—		25,000		—		25,000
Total Assets	$	2,056,382	$	10,402,158	$	145,814	$	728,900	$	13,333,254
Liabilities
Derivative instruments (see Note 5)	$	—	$	3,439	$	10,942	$	—	$	14,381
Cash settled awards (see Note 8)	—		8,789		—		—		8,789
Total Liabilities	$	—	$	12,228	$	10,942	$	—	$	23,170

(1) Includes Long/short equity, Multi-strategy and Event-driven funds.

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair value based on NAV practical expedient		Total Fair Value
At December 31, 2017
Assets
Fixed maturities
U.S. government and agency	$	1,658,622	$	53,847	$	—	$	—	$	1,712,469
Non-U.S. government	—		806,299		—		—		806,299
Corporate debt	—		5,244,969		52,897		—		5,297,866
Agency RMBS	—		2,395,152		—		—		2,395,152
CMBS	—		777,728		—		—		777,728
Non-Agency RMBS	—		46,831		—		—		46,831
ABS	—		1,436,281		—		—		1,436,281
Municipals	—		149,380		—		—		149,380
	1,658,622		10,910,487		52,897		—		12,622,006
Equity securities
Common stocks	25,658		—		—		—		25,658
Exchange-traded funds	427,633		—		—		—		427,633
Bond mutual funds	—		182,220		—		—		182,220
	453,291		182,220		—		—		635,511
Other investments
Hedge funds (1)	—		—		—		363,811		363,811
Direct lending funds	—		—		—		250,681		250,681
Private equity funds	—		—		—		68,812		68,812
Real estate funds	—		—		—		50,009		50,009
Other privately held investments	—		—		46,430		—		46,430
CLO-Equities	—		—		31,413		—		31,413
Overseas deposits	—		198,217		—		—		198,217
	—		198,217		77,843		733,313		1,009,373
Short-term investments	—		83,661		—		—		83,661
Other assets
Derivative instruments (see Note 5)	—		5,125		—		—		5,125
Insurance-linked securities	—		—		25,090		—		25,090
Total Assets	$	2,111,913	$	11,379,710	$	155,830	$	733,313	$	14,380,766
Liabilities
Derivative instruments (see Note 5)	$	—	$	2,876	$	11,510	$	—	$	14,386
Cash settled awards (see Note 8)	—		21,535		—		—		21,535
Total Liabilities	$	—	$	24,411	$	11,510	$	—	$	35,921

(1) Includes Long/short equity, Multi-strategy and Event-driven funds.

LEVEL 3 FAIR VALUE MEASUREMENT INPUTS

Except certain fixed maturities and insurance-linked securities priced using broker-dealer quotes (underlying inputs are not available), the following table quantifies the significant unobservable inputs used in estimating fair values at March 31,2018 for investments classified as Level 3 in the fair value hierarchy.

	Fair Value			Valuation Technique	Unobservable Input	Range	Weighted Average
Other investments - CLO-Equities	$	27,118		Discounted cash flow	Default rates	3.0%	3.0%
					Loss severity rate	35.0%	35.0%
					Collateral spreads	3.0%	3.0%
					Estimated maturity dates	7 years	7 years
	$	1,438		Liquidation value	Fair value of collateral	100%	100%
					Discount margin	0.1% - 12.0%	2.1%
Other investments - Other privately held investments	$	48,787		Discounted cash flow	Discount rate	3.0% - 8.5%	7.2%
Derivatives - Other underwriting-related derivatives	$	(10,942	)	Discounted cash flow	Discount rate	2.7%	2.7%

CHANGES IN LEVEL 3 FINANCIAL INSTRUMENTS MEASURED AT FAIR VALUE ON A RECURRING BASIS, ASSETS

The following tables present changes in Level 3 for financial instruments measured at fair value on a recurring basis for the periods indicated:

	Opening Balance		Transfers into Level 3		Transfers out of Level 3			Included in net income(1)			Included in OCI (2)		Purchases		Sales			Settlements/ Distributions			Closing Balance		Change in unrealized investment gains/(losses) (3)
Three months ended March 31, 2018
Fixed maturities
Corporate debt	$	52,897	$	—	$	(4,279	)	$	(118	)	$	1,403	$	—	$	(2,536	)	$	(3,896	)	$	43,471	$	—
CMBS	—		—		—			—			—		—		—			—			—		—
ABS	—		—		—			—			—		—		—			—			—		—
	52,897		—		(4,279		)	(118		)	1,403		—		(2,536		)	(3,896		)	43,471		—
Other investments
Other privately held investments	46,430		—		—			746			—		3,111		(1,500		)	—			48,787		746
CLO - Equities	31,413		—		—			1,616			—		—		—			(4,473		)	28,556		1,616
	77,843		—		—			2,362			—		3,111		(1,500		)	(4,473		)	77,343		2,362
Other assets
Derivative instruments	—		—		—			—			—		—		—			—			—		—
Insurance-linked securities	25,090		—		—			(90		)	—		—		—			—			25,000		(90		)
	25,090		—		—			(90		)	—		—		—			—			25,000		(90		)
Total assets	$	155,830	$	—	$	(4,279	)	$	2,154		$	1,403	$	3,111	$	(4,036	)	$	(8,369	)	$	145,814	$	2,272
Other liabilities
Derivative instruments	$	11,510	$	—	$	—		$	(568	)	$	—	$	—	$	—		$	—		$	10,942	$	(568	)
Total liabilities	$	11,510	$	—	$	—		$	(568	)	$	—	$	—	$	—		$	—		$	10,942	$	(568	)

	Opening Balance		Transfers into Level 3		Transfers out of Level 3			Included in net income(1)		Included in OCI (2)			Purchases		Sales			Settlements/ Distributions			Closing Balance		Change in unrealized investment gains/(losses) (3)
Three months ended March 31, 2017
Fixed maturities
Corporate debt	$	75,875	$	—	$	—		$	58	$	(47	)	$	5,964	$	(15,720	)	$	(2,342	)	$	63,788	$	—
CMBS	3,061		—		—			—		(3		)	9,400		—			(2,645		)	9,813		—
ABS	17,464		—		(18,948		)	—		1,484			—		—			—			—		—
	96,400		—		(18,948		)	58		1,434			15,364		(15,720		)	(4,987		)	73,601		—
Other investments
Other privately held investments	42,142		—		—			236		—			—		—			—			42,378		236
CLO - Equities	60,700		—		—			1,029		—			—		—			(7,337		)	54,392		1,029
	102,842		—		—			1,265		—			—		—			(7,337		)	96,770		1,265
Other assets
Derivative instruments	2,532		—		—			755		—			—		—			(90		)	3,197		755
Insurance-linked securities	25,023		—		—			3		—			—		—			—			25,026		3
	27,555		—		—			758		—			—		—			(90		)	28,223		758
Total assets	$	226,797	$	—	$	(18,948	)	$	2,081	$	1,434		$	15,364	$	(15,720	)	$	(12,414	)	$	198,594	$	2,023
Other liabilities
Derivative instruments	$	6,500	$	—	$	—		$	8,686	$	—		$	—	$	—		$	1,435		$	16,621	$	7,335
Total liabilities	$	6,500	$	—	$	—		$	8,686	$	—		$	—	$	—		$	1,435		$	16,621	$	7,335

(1) Realized gains (losses) on fixed maturities, and realized and unrealized gains (losses) on other assets and other liabilities included in net income are included in net investment gains (losses). Realized and unrealized gains and (losses) on other investments included in net income are included in net investment income.

(2) Unrealized gains (losses) on fixed maturities are included in other comprehensive income ("OCI").

(3) Change in unrealized investment gain (loss) relating to assets held at the reporting date.

CHANGES IN LEVEL 3 FINANCIAL INSTRUMENTS MEASURED AT FAIR VALUE ON A RECURRING BASIS, LIABILITIES

The following tables present changes in Level 3 for financial instruments measured at fair value on a recurring basis for the periods indicated:

	Opening Balance		Transfers into Level 3		Transfers out of Level 3			Included in net income(1)			Included in OCI (2)		Purchases		Sales			Settlements/ Distributions			Closing Balance		Change in unrealized investment gains/(losses) (3)
Three months ended March 31, 2018
Fixed maturities
Corporate debt	$	52,897	$	—	$	(4,279	)	$	(118	)	$	1,403	$	—	$	(2,536	)	$	(3,896	)	$	43,471	$	—
CMBS	—		—		—			—			—		—		—			—			—		—
ABS	—		—		—			—			—		—		—			—			—		—
	52,897		—		(4,279		)	(118		)	1,403		—		(2,536		)	(3,896		)	43,471		—
Other investments
Other privately held investments	46,430		—		—			746			—		3,111		(1,500		)	—			48,787		746
CLO - Equities	31,413		—		—			1,616			—		—		—			(4,473		)	28,556		1,616
	77,843		—		—			2,362			—		3,111		(1,500		)	(4,473		)	77,343		2,362
Other assets
Derivative instruments	—		—		—			—			—		—		—			—			—		—
Insurance-linked securities	25,090		—		—			(90		)	—		—		—			—			25,000		(90		)
	25,090		—		—			(90		)	—		—		—			—			25,000		(90		)
Total assets	$	155,830	$	—	$	(4,279	)	$	2,154		$	1,403	$	3,111	$	(4,036	)	$	(8,369	)	$	145,814	$	2,272
Other liabilities
Derivative instruments	$	11,510	$	—	$	—		$	(568	)	$	—	$	—	$	—		$	—		$	10,942	$	(568	)
Total liabilities	$	11,510	$	—	$	—		$	(568	)	$	—	$	—	$	—		$	—		$	10,942	$	(568	)

	Opening Balance		Transfers into Level 3		Transfers out of Level 3			Included in net income(1)		Included in OCI (2)			Purchases		Sales			Settlements/ Distributions			Closing Balance		Change in unrealized investment gains/(losses) (3)
Three months ended March 31, 2017
Fixed maturities
Corporate debt	$	75,875	$	—	$	—		$	58	$	(47	)	$	5,964	$	(15,720	)	$	(2,342	)	$	63,788	$	—
CMBS	3,061		—		—			—		(3		)	9,400		—			(2,645		)	9,813		—
ABS	17,464		—		(18,948		)	—		1,484			—		—			—			—		—
	96,400		—		(18,948		)	58		1,434			15,364		(15,720		)	(4,987		)	73,601		—
Other investments
Other privately held investments	42,142		—		—			236		—			—		—			—			42,378		236
CLO - Equities	60,700		—		—			1,029		—			—		—			(7,337		)	54,392		1,029
	102,842		—		—			1,265		—			—		—			(7,337		)	96,770		1,265
Other assets
Derivative instruments	2,532		—		—			755		—			—		—			(90		)	3,197		755
Insurance-linked securities	25,023		—		—			3		—			—		—			—			25,026		3
	27,555		—		—			758		—			—		—			(90		)	28,223		758
Total assets	$	226,797	$	—	$	(18,948	)	$	2,081	$	1,434		$	15,364	$	(15,720	)	$	(12,414	)	$	198,594	$	2,023
Other liabilities
Derivative instruments	$	6,500	$	—	$	—		$	8,686	$	—		$	—	$	—		$	1,435		$	16,621	$	7,335
Total liabilities	$	6,500	$	—	$	—		$	8,686	$	—		$	—	$	—		$	1,435		$	16,621	$	7,335

(1) Realized gains (losses) on fixed maturities, and realized and unrealized gains (losses) on other assets and other liabilities included in net income are included in net investment gains (losses). Realized and unrealized gains and (losses) on other investments included in net income are included in net investment income.

(2) Unrealized gains (losses) on fixed maturities are included in other comprehensive income ("OCI").

(3) Change in unrealized investment gain (loss) relating to assets held at the reporting date.

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DERIVATIVE INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

LOCATION AND AMOUNTS OF DERIVATIVE FAIR VALUES ON THE CONSOLIDATED BALANCE SHEET

The balance sheet classifications of derivatives recorded at fair value are shown in the following table. The notional amount of derivative contracts represents the basis upon which pay or receive amounts are calculated and are presented in the table to quantify the volume of the Company's derivative activities. Notional amounts are not reflective of credit risk.

None of the Company's derivative instruments are designated as hedges under current accounting guidance.

	March 31, 2018						December 31, 2017
	Derivative Notional Amount		Derivative Asset Fair Value(1)		Derivative Liability Fair Value(1)		Derivative Notional Amount		Derivative Asset Fair Value(1)		Derivative Liability Fair Value(1)
Relating to investment portfolio:
Foreign exchange forward contracts	$	120,762	$	146	$	161	$	137,422	$	10	$	619
Interest rate swaps	166,000		—		1,379		191,000		448		1,556
Relating to underwriting portfolio:
Foreign exchange forward contracts	649,919		5,137		1,899		698,959		4,667		701
Weather-related contracts	—		—		—		—		—		—
Other underwriting-related contracts	85,000		—		10,942		85,000		—		11,510
Total derivatives			$	5,283	$	14,381			$	5,125	$	14,386

(1) Asset and liability derivatives are classified within other assets and other liabilities in the Consolidated Balance Sheets.

RECONCILIATION OF GROSS DERIVATIVE ASSETS TO NET AMOUNTS PRESENTED IN BALANCE SHEETS

A reconciliation of gross derivative assets and liabilities to the net amounts presented in the Consolidated Balance Sheets, with the difference being attributable to the impact of master netting agreements, is shown in the following table.

	March 31, 2018							December 31, 2017
	Gross Amounts		Gross Amounts Offset			Net Amounts(1)		Gross Amounts		Gross Amounts Offset			Net Amounts(1)
Derivative assets	$	6,703	$	(1,420	)	$	5,283	$	8,178	$	(3,053	)	$	5,125
Derivative liabilities	$	15,801	$	(1,420	)	$	14,381	$	17,439	$	(3,053	)	$	14,386

(1) Net asset and liability derivatives are classified within other assets and other liabilities in the Consolidated Balance Sheets.

RECONCILIATION OF GROSS DERIVATIVE LIABILITIES TO NET AMOUNTS PRESENTED IN BALANCE SHEETS

A reconciliation of gross derivative assets and liabilities to the net amounts presented in the Consolidated Balance Sheets, with the difference being attributable to the impact of master netting agreements, is shown in the following table.

	March 31, 2018							December 31, 2017
	Gross Amounts		Gross Amounts Offset			Net Amounts(1)		Gross Amounts		Gross Amounts Offset			Net Amounts(1)
Derivative assets	$	6,703	$	(1,420	)	$	5,283	$	8,178	$	(3,053	)	$	5,125
Derivative liabilities	$	15,801	$	(1,420	)	$	14,381	$	17,439	$	(3,053	)	$	14,386

(1) Net asset and liability derivatives are classified within other assets and other liabilities in the Consolidated Balance Sheets.

TOTAL UNREALIZED AND REALIZED GAINS (LOSSES) ON DERIVATIVES NOT DESIGNATED AS HEDGES RECORDED IN EARNINGS

The total unrealized and realized gains (losses) recognized in net income for derivatives not designated as hedges are shown in the following table:

	Location of Gain (Loss) Recognized in Income on Derivative	Three months ended March 31,
		2018			2017
Relating to investment portfolio:
Foreign exchange forward contracts	Net investment gains (losses)	$	(1,191	)	$	(2,372	)
Interest rate swaps	Net investment gains (losses)	3,214			439
Relating to underwriting portfolio:
Foreign exchange forward contracts	Foreign exchange losses (gains)	7,768			(2,758		)
Weather-related contracts	Other insurance related income (losses)	—			(7,932		)
Other underwriting-related contracts	Other insurance related income (losses)	901			—
Total		$	10,692		$	(12,623	)

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RESERVE FOR LOSSES AND LOSS EXPENSES (Tables)

3 Months Ended

Mar. 31, 2018

Insurance Loss Reserves [Abstract]

RECONCILIATION OF BEGINNING AND ENDING GROSS RESERVE FOR LOSSES AND LOSS EXPENSES AND NET RESERVE FOR UNPAID LOSSES AND LOSS EXPENSES

The following table presents a reconciliation of the Company's beginning and ending gross reserve for losses and loss expenses and net reserve for unpaid losses and loss expenses for the periods indicated:

	Three months ended March 31,
	2018			2017
Gross reserve for losses and loss expenses, beginning of period	$	12,997,553		$	9,697,827
Less reinsurance recoverable on unpaid losses, beginning of period	(3,159,514		)	(2,276,109		)
Net reserve for unpaid losses and loss expenses, beginning of period	9,838,039			7,421,718
Net incurred losses and loss expenses related to:
Current year	715,652			631,735
Prior years	(54,307		)	(24,793		)
	661,345			606,942
Net paid losses and loss expenses related to:
Current year	(48,814		)	(31,047		)
Prior years	(675,393		)	(521,478		)
	(724,207		)	(552,525		)
Foreign exchange and other	(726,781		)	36,797
Net reserve for unpaid losses and loss expenses, end of period	9,048,396			7,512,932
Reinsurance recoverable on unpaid losses, end of period	2,986,247			2,029,031
Gross reserve for losses and loss expenses, end of period	$	12,034,643		$	9,541,963

NET PRIOR YEAR RESERVE DEVELOPMENT BY SEGMENT

Prior year reserve development arises from changes to loss and loss expense estimates related to loss events that occurred in previous calendar years. Such development is summarized by segment in the following table:

	Three months ended March 31,
	2018		2017
Insurance	$	22,775	$	7,865
Reinsurance	31,532		16,928
Total	$	54,307	$	24,793

SCHEDULE OF THE LINE OF BUSINESS CATEGORIES AND THE EXPECTED CLAIM TAILS

The following tables reconcile reserve classes to the lines of business categories and the expected claim tails:

Insurance Segment
		Reported Lines of Business
Reserve Classes	Tail	Property	Marine	Terrorism	Aviation	Credit and Political Risk	Professional Lines	Liability	Accident and Health	Discontinued lines - Novae
Property and Other	Short	X		X					X	X
Marine	Short		X
Aviation	Short				X
Credit and Political Risk	Medium					X
Professional Lines	Medium						X			X
Liability	Long							X		X

Reinsurance Segment

Reported Lines of Business

Reserve Classes

Tail

Catastrophe

Property

Credit and Surety

Professional Lines

Motor

Liability

Engineering

Agriculture

Marine and Other

Accident and Health

Discontinued lines - Novae

Property and Other

Short

X

X

X

X

X

X

X

Credit and Surety

Medium

X

Professional Lines

Medium

X

Motor

Long

X

X

Liability

Long

X

X

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EARNINGS PER COMMON SHARE (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

BASIC AND DILUTED EARNINGS PER COMMON SHARE

The following table presents a comparison of basic and diluted earnings per common share:

	Three months ended March 31,
	2018		2017
Basic earnings per common share
Net income	$	73,202	$	19,855
Less: preferred share dividends	10,656		14,841
Net income available to common shareholders	62,546		5,014
Weighted average common shares outstanding - basic	83,322		86,022
Basic earnings per common share	$	0.75	$	0.06
Diluted earnings per common share
Net income available to common shareholders	$	62,546	$	5,014
Weighted average common shares outstanding - basic	83,322		86,022
Share-based compensation plans	399		771
Weighted average common shares outstanding - diluted	83,721		86,793
Diluted earnings per common share	$	0.75	$	0.06
Weighted average anti-dilutive shares excluded from the dilutive computation	810		551

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SHARE-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

RECONCILIATIONS OF BEGINNING AND ENDING BALANCE OF NONVESTED RESTRICTED STOCK (INCLUDING RSUS) TO BE SETTLED IN SHARES AND CASH

The following table provides a summary of nonvested cash settled restricted stock units for the three months endedMarch 31,2018:

	Cash Settled Performance Vesting Restricted Stock Units		Cash Settled Service-based Restricted Stock Units
	Number of Restricted Stock Units		Number of Restricted Stock Units
Nonvested restricted stock units - beginning of period	42		988
Granted	—		449
Vested	(12	)	(360	)
Forfeited	—		(20	)
Nonvested restricted stock units - end of period	30		1,057

The following table provides a summary of nonvested share settled restricted stock units for the three months endedMarch 31,2018:

	Share Settled Performance Vesting Restricted Stock Units				Share Settled - Service Based Restricted Stock Units
	Number of Restricted Stock Units		Weighted  Average Grant Date Fair Value(1)		Number of Restricted Stock Units		Weighted  Average Grant Date Fair Value(1)
Nonvested restricted stock units - beginning of period	230		$	57.08	1,355		$	57.09
Granted	104		48.89		711		49.07
Vested	(51	)	53.81		(455	)	54.44
Forfeited	—		—		(20	)	57.45
Nonvested restricted stock units - end of period	283		$	54.68	1,591		$	54.18

(1) Fair value is based on the closing price of our common shares on the grant approval date.

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SHAREHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

COMMON SHARES ISSUED AND OUTSTANDING

The following table presents common shares issued and outstanding:

	Three months ended March 31,
	2018		2017
Shares issued, balance at beginning of period	176,580		176,580
Shares issued	—		—
Total shares issued at end of period	176,580		176,580
Treasury shares, balance at beginning of period	(93,419	)	(90,139	)
Shares repurchased	(149	)	(2,229	)
Shares reissued	506		958
Total treasury shares at end of period	(93,062	)	(91,410	)
Total shares outstanding	83,518		85,170

SHARE REPURCHASES

The following table presents share repurchases:

	Three months ended March 31,
	2018		2017
In the open market:
Total shares	—		1,896
Total cost	$	—	$	127,982
Average price per share(1)	$	—	$	67.52
From employees:(2)
Total shares	149		333
Total cost	$	7,163	$	23,260
Average price per share(1)	$	48.08	$	69.80
Total shares repurchased:
Total shares	149		2,229
Total cost	$	7,163	$	151,242
Average price per share(1)	$	48.08	$	67.86

(1) Calculated using whole numbers.

(2) Shares are repurchased from employees to satisfy withholding tax liabilities upon the vesting of restricted stock awards and restricted stock units.

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OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

TAX EFFECTS ALLOCATED TO EACH COMPONENT OF OTHER COMPREHENSIVE INCOME

The tax effects allocated to each component of other comprehensive income (loss) are shown in the following table:

	2018									2017
	Before Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Before Tax Amount		Tax (Expense) Benefit			Net of Tax Amount
Three months ended March 31,
Available for sale investments:
Unrealized investment gains (losses) arising during the period	$	(105,675	)	$	(6,516	)	$	(112,191	)	$	70,372	$	(2,669	)	$	67,703
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	(4,112		)	4,897			785			25,759		(791		)	24,968
Unrealized investment gains (losses) arising during the period, net of reclassification adjustment(1)	(109,787		)	(1,619		)	(111,406		)	96,131		(3,460		)	92,671
Foreign currency translation adjustment	1,270			—			1,270			29,869		—			29,869
Total other comprehensive income (loss), net of tax	$	(108,517	)	$	(1,619	)	$	(110,136	)	$	126,000	$	(3,460	)	$	122,540

(1) Effective January 1, 2018, the Company adopted ASU No. 2016-01. The adoption of this guidance resulted in a cumulative adjustment to reclassify unrealized investment gains on equity securities from accumulated other comprehensive income to retained earnings. As prescribed, the prior period has not been restated to conform to the current presentation. Refer to Item 1, Note 1 'Basis of Presentation and Significant Accounting Policies' to the Consolidated Financial Statements for additional information.

RECLASSIFICATIONS OUT OF AOCI INTO NET INCOME AVAILABLE TO COMMON SHAREHOLDERS

Reclassifications from AOCI to net income available to common shareholders are shown in the following table:

		Amount Reclassified from AOCI(1)
Details About AOCI Components	Consolidated Statement of Operations Line Item That Includes Reclassification	Three months ended March 31,
		2018			2017
Unrealized investment gains (losses) on available for sale investments
	Other investment gains (losses)	$	4,526		$	(19,206	)
	OTTI losses	(414		)	(6,553		)
	Total before tax	4,112			(25,759		)
	Income tax (expense) benefit	(4,897		)	791
	Net of tax	$	(785	)	$	(24,968	)
Foreign currency translation adjustment
	Foreign exchange loss	$	—		$	(24,149	)
	Income tax (expense) benefit	—			—
	Net of tax	$	—		$	(24,149	)

(1) Amounts in parentheses are debits to net income (loss) available to common shareholders.

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains (losses) on equities	$ (20,813)	$ 0
Accounting Standards Update 2018-02 | Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of ASU			$ (2,142)	$ 0
Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains (losses) on equities	70,000
Deferred Income Tax Expense (Benefit)	13,000
Accounting Standards Update 2016-01 | Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of ASU			$ 69,604	$ 0
Service Fees and Reimbursement of Expenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from contract with customer,	$ 10,000

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SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) reportable_segment	Mar. 31, 2017 USD ($)
Segment Information [Line Items]
Number of reportable segments | reportable_segment	2
Net premiums earned	$ 1,167,402	$ 938,703
Other insurance related income (losses)	6,606	(3,783)
Net losses and loss expenses	(661,345)	(606,942)
Acquisition costs	(229,260)	(189,792)
Expenses	(169,837)	(161,260)
Net investment income	100,999	98,664
Net investment losses	(14,830)	(25,050)
Foreign exchange losses	(37,860)	(21,465)
Interest expense and financing costs	(16,763)	(12,791)
Reorganization expenses	(13,054)	0
Amortization of value of business acquired	(57,110)	0
Amortization of intangibles	(2,782)	0
Income before income taxes and interest in income (loss) of equity method investments	$ 72,166	$ 16,284
Net loss and loss expense ratio	56.70%	64.70%
Acquisition cost ratio	19.60%	20.20%
General and administrative expense ratio	14.50%	17.20%
Combined ratio	90.80%	102.10%
Goodwill	$ 506,747	$ 84,613
Operating Segments
Segment Information [Line Items]
Gross premiums written	2,662,795	1,911,871
Net premiums written	1,985,871	1,508,959
Net premiums earned	1,167,402	938,703
Other insurance related income (losses)	6,606	(3,783)
Net losses and loss expenses	(661,345)	(606,942)
Acquisition costs	(229,260)	(189,792)
Expenses	(139,666)	(121,801)
Underwriting income	143,737	16,385
Operating Segments | Insurance
Segment Information [Line Items]
Gross premiums written	880,848	545,261
Net premiums written	547,893	356,836
Net premiums earned	580,059	391,964
Other insurance related income (losses)	620	42
Net losses and loss expenses	(321,538)	(241,085)
Acquisition costs	(87,329)	(54,004)
Expenses	(102,370)	(85,256)
Underwriting income	$ 69,442	$ 11,661
Net loss and loss expense ratio	55.40%	61.50%
Acquisition cost ratio	15.10%	13.80%
General and administrative expense ratio	17.60%	21.80%
Combined ratio	88.10%	97.00%
Goodwill	$ 506,747	$ 84,613
Operating Segments | Reinsurance
Segment Information [Line Items]
Gross premiums written	1,781,947	1,366,610
Net premiums written	1,437,978	1,152,122
Net premiums earned	587,343	546,739
Other insurance related income (losses)	5,986	(3,825)
Net losses and loss expenses	(339,807)	(365,857)
Acquisition costs	(141,931)	(135,788)
Expenses	(37,296)	(36,545)
Underwriting income	$ 74,295	$ 4,724
Net loss and loss expense ratio	57.90%	66.90%
Acquisition cost ratio	24.20%	24.80%
General and administrative expense ratio	6.30%	6.70%
Combined ratio	88.40%	98.40%
Goodwill	$ 0	$ 0
Corporate, Non-Segment
Segment Information [Line Items]
Expenses	(30,171)	(39,459)
Significant Reconciling Items
Segment Information [Line Items]
Net investment income	100,999	98,664
Net investment losses	(14,830)	(25,050)
Foreign exchange losses	(37,860)	(21,465)
Interest expense and financing costs	(16,763)	(12,791)
Reorganization expenses	(13,054)	0
Amortization of value of business acquired	(57,110)	0
Amortization of intangibles	$ (2,782)	$ 0

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INVESTMENTS (Fixed Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 11,898,060	$ 12,611,219
Gross Unrealized Gains	77,008	101,660
Gross Unrealized Losses	(173,672)	(90,873)
Fair Value (fixed maturities)	11,801,396	12,622,006
Non-credit OTTI in AOCI	(866)	(853)
U.S. government and agency
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,821,951	1,727,643
Gross Unrealized Gains	908	1,735
Gross Unrealized Losses	(25,894)	(16,909)
Fair Value (fixed maturities)	1,796,965	1,712,469
Non-credit OTTI in AOCI	0	0
Non-U.S. government
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	649,396	798,582
Gross Unrealized Gains	21,084	17,240
Gross Unrealized Losses	(9,256)	(9,523)
Fair Value (fixed maturities)	661,224	806,299
Non-credit OTTI in AOCI	0	0
Corporate debt
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,670,815	5,265,795
Gross Unrealized Gains	40,698	61,922
Gross Unrealized Losses	(71,082)	(29,851)
Fair Value (fixed maturities)	4,640,431	5,297,866
Non-credit OTTI in AOCI	0	0
Agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,956,394	2,414,720
Gross Unrealized Gains	4,644	8,132
Gross Unrealized Losses	(46,193)	(27,700)
Fair Value (fixed maturities)	1,914,845	2,395,152
Non-credit OTTI in AOCI	0	0
CMBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,042,704	776,715
Gross Unrealized Gains	1,964	4,138
Gross Unrealized Losses	(14,047)	(3,125)
Fair Value (fixed maturities)	1,030,621	777,728
Non-credit OTTI in AOCI	0	0
Non-Agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	39,930	45,713
Gross Unrealized Gains	1,997	1,917
Gross Unrealized Losses	(530)	(799)
Fair Value (fixed maturities)	41,397	46,831
Non-credit OTTI in AOCI	(866)	(853)
ABS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,566,484	1,432,884
Gross Unrealized Gains	4,932	5,391
Gross Unrealized Losses	(4,718)	(1,994)
Fair Value (fixed maturities)	1,566,698	1,436,281
Non-credit OTTI in AOCI	0	0
Municipals
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	150,386	149,167
Gross Unrealized Gains	781	1,185
Gross Unrealized Losses	(1,952)	(972)
Fair Value (fixed maturities)	149,215	149,380
Non-credit OTTI in AOCI	$ 0	$ 0

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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Cost	$ 374,091	$ 552,867
Gross Unrealized Gains	63,142	84,527
Gross Unrealized Losses	(1,491)	(1,883)
Equity securities	435,742	635,511
Common stocks
Investment [Line Items]
Cost	23,251	22,836
Gross Unrealized Gains	1,668	3,412
Gross Unrealized Losses	(977)	(590)
Equity securities	23,942	25,658
Exchange-traded funds
Investment [Line Items]
Cost	211,301	356,252
Gross Unrealized Gains	51,843	71,675
Gross Unrealized Losses	(514)	(294)
Equity securities	262,630	427,633
Bond mutual funds
Investment [Line Items]
Cost	139,539	173,779
Gross Unrealized Gains	9,631	9,440
Gross Unrealized Losses	0	(999)
Equity securities	$ 149,170	$ 182,220

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INVESTMENTS (Contractual Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Due in one year or less (amortized cost)	$ 513,226	$ 486,659
Due after one year through five years (amortized cost)	4,642,999	4,906,207
Due after five years through ten years (amortized cost)	1,942,501	2,338,964
Due after ten years (amortized cost)	193,822	209,357
Total fixed maturities with a single maturity date (amortized cost)	7,292,548	7,941,187
Total (amortized cost)	11,898,060	12,611,219
Due in one year or less (fair value)	507,980	484,663
Due after one year through five years (fair value)	4,626,323	4,912,189
Due after five years through ten years (fair value)	1,911,664	2,350,433
Due after ten years (fair value)	201,868	218,729
Total fixed maturities with a single maturity date (fair value)	7,247,835	7,966,014
Fair Value (fixed maturities)	$ 11,801,396	$ 12,622,006
Due in one year or less (% of total fair value)	4.30%	3.80%
Due after one year through five years (% of total fair value)	39.20%	38.90%
Due after five years through ten years (% of total fair value)	16.20%	18.60%
Due after ten years (% of total fair value)	1.70%	1.70%
Fixed maturities with a single maturity date (% of total fair value)	61.40%	63.00%
Total	100.00%	100.00%
Agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities without a single maturity date (amortized cost)	$ 1,956,394	$ 2,414,720
Total (amortized cost)	1,956,394	2,414,720
Fixed maturities without a single maturity date (fair value)	1,914,845	2,395,152
Fair Value (fixed maturities)	$ 1,914,845	$ 2,395,152
Fixed maturities without a single maturity date (% of total fair value)	16.20%	19.00%
CMBS
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities without a single maturity date (amortized cost)	$ 1,042,704	$ 776,715
Total (amortized cost)	1,042,704	776,715
Fixed maturities without a single maturity date (fair value)	1,030,621	777,728
Fair Value (fixed maturities)	$ 1,030,621	$ 777,728
Fixed maturities without a single maturity date (% of total fair value)	8.70%	6.20%
Non-Agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities without a single maturity date (amortized cost)	$ 39,930	$ 45,713
Total (amortized cost)	39,930	45,713
Fixed maturities without a single maturity date (fair value)	41,397	46,831
Fair Value (fixed maturities)	$ 41,397	$ 46,831
Fixed maturities without a single maturity date (% of total fair value)	0.40%	0.40%
ABS
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities without a single maturity date (amortized cost)	$ 1,566,484	$ 1,432,884
Total (amortized cost)	1,566,484	1,432,884
Fixed maturities without a single maturity date (fair value)	1,566,698	1,436,281
Fair Value (fixed maturities)	$ 1,566,698	$ 1,436,281
Fixed maturities without a single maturity date (% of total fair value)	13.30%	11.40%

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INVESTMENTS (Gross Unrealized Losses) (Details) $ in Thousands	Mar. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
U.S. government and agency
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	$ 179,214	$ 194,916
Unrealized Losses - 12 months or greater	(7,184)	(5,963)
Fair Value - Less than 12 months	1,219,143	1,389,792
Unrealized Losses - Less than 12 months	(18,710)	(10,946)
Total Fair Value of Securities in Unrealized Loss Position	1,398,357	1,584,708
Total Unrealized Losses	(25,894)	(16,909)
Non-U.S. government
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	47,017	62,878
Unrealized Losses - 12 months or greater	(4,693)	(6,806)
Fair Value - Less than 12 months	214,545	204,110
Unrealized Losses - Less than 12 months	(4,563)	(2,717)
Total Fair Value of Securities in Unrealized Loss Position	261,562	266,988
Total Unrealized Losses	(9,256)	(9,523)
Corporate debt
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	335,415	407,300
Unrealized Losses - 12 months or greater	(15,212)	(11,800)
Fair Value - Less than 12 months	2,853,336	2,041,845
Unrealized Losses - Less than 12 months	(55,870)	(18,051)
Total Fair Value of Securities in Unrealized Loss Position	3,188,751	2,449,145
Total Unrealized Losses	(71,082)	(29,851)
Agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	603,008	759,255
Unrealized Losses - 12 months or greater	(24,241)	(17,453)
Fair Value - Less than 12 months	1,011,088	1,172,313
Unrealized Losses - Less than 12 months	(21,952)	(10,247)
Total Fair Value of Securities in Unrealized Loss Position	1,614,096	1,931,568
Total Unrealized Losses	(46,193)	(27,700)
CMBS
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	29,098	31,607
Unrealized Losses - 12 months or greater	(1,272)	(703)
Fair Value - Less than 12 months	684,264	348,943
Unrealized Losses - Less than 12 months	(12,775)	(2,422)
Total Fair Value of Securities in Unrealized Loss Position	713,362	380,550
Total Unrealized Losses	(14,047)	(3,125)
Non-Agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	8,089	8,029
Unrealized Losses - 12 months or greater	(453)	(788)
Fair Value - Less than 12 months	108,548	4,197
Unrealized Losses - Less than 12 months	(77)	(11)
Total Fair Value of Securities in Unrealized Loss Position	116,637	12,226
Total Unrealized Losses	(530)	(799)
ABS
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	43,804	57,298
Unrealized Losses - 12 months or greater	(455)	(570)
Fair Value - Less than 12 months	547,077	392,170
Unrealized Losses - Less than 12 months	(4,263)	(1,424)
Total Fair Value of Securities in Unrealized Loss Position	590,881	449,468
Total Unrealized Losses	(4,718)	(1,994)
Municipals
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	11,101	11,230
Unrealized Losses - 12 months or greater	(375)	(269)
Fair Value - Less than 12 months	93,140	65,632
Unrealized Losses - Less than 12 months	(1,577)	(703)
Total Fair Value of Securities in Unrealized Loss Position	104,241	76,862
Total Unrealized Losses	(1,952)	(972)
Fixed maturities
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	1,256,746	1,532,513
Unrealized Losses - 12 months or greater	(53,885)	(44,352)
Fair Value - Less than 12 months	6,731,141	5,619,002
Unrealized Losses - Less than 12 months	(119,787)	(46,521)
Total Fair Value of Securities in Unrealized Loss Position	7,987,887	7,151,515
Total Unrealized Losses	$ (173,672)	$ (90,873)
Number of Available For Sale Securities In Unrealized Loss Positions | security	2,940	2,424
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater | security	555	627
Fixed maturities | Below Investment Grade or Not Rated
Schedule Of Available For Sale Securities [Line Items]
Total Unrealized Losses	$ (11,000)	$ (7,000)
Common stocks
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater		0
Unrealized Losses - 12 months or greater		0
Fair Value - Less than 12 months		3,202
Unrealized Losses - Less than 12 months		(590)
Total Fair Value of Securities in Unrealized Loss Position		3,202
Total Unrealized Losses		(590)
Exchange-traded funds
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater		0
Unrealized Losses - 12 months or greater		0
Fair Value - Less than 12 months		12,323
Unrealized Losses - Less than 12 months		(294)
Total Fair Value of Securities in Unrealized Loss Position		12,323
Total Unrealized Losses		(294)
Bond mutual funds
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater		0
Unrealized Losses - 12 months or greater		0
Fair Value - Less than 12 months		12,184
Unrealized Losses - Less than 12 months		(999)
Total Fair Value of Securities in Unrealized Loss Position		12,184
Total Unrealized Losses		(999)
Equity securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater		0
Unrealized Losses - 12 months or greater		0
Fair Value - Less than 12 months		27,709
Unrealized Losses - Less than 12 months		(1,883)
Total Fair Value of Securities in Unrealized Loss Position		27,709
Total Unrealized Losses		$ (1,883)

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INVESTMENTS (Mortgage Loans) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans held-for-investment, net [Abstract]
Commercial	$ 364,769,000	$ 325,062,000
Commercial, Percent	100.00%	100.00%
Valuation allowances	$ 0	$ 0
Valuation allowance, Percent	0.00%	0.00%
Total Mortgage Loans held-for-investment	$ 364,769,000	$ 325,062,000
Total Mortgage Loans held-for investment, Percent	100.00%	100.00%
Weighted average debt service coverage ratios	2.9
Weighted average loan-to-value ratios (less than)	60.00%

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INVESTMENTS (Other Investments) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Other Investments [Line Items]
Other investments	$ 1,009,587	$ 1,009,373
Percentage of total fair value	100.00%	100.00%
Long/short equity funds
Other Investments [Line Items]
Other investments	$ 25,489	$ 38,470
Percentage of total fair value	3.00%	4.00%
Redemption notice period	60 days	60 days
Multi-strategy funds
Other Investments [Line Items]
Other investments	$ 283,298	$ 286,164
Percentage of total fair value	28.00%	28.00%
Multi-strategy funds | Other Redemption Restriction
Other Investments [Line Items]
Unfunded commitments related to other investments	$ 17,000	$ 16,000
Multi-strategy funds | Minimum
Other Investments [Line Items]
Redemption notice period	60 days	60 days
Multi-strategy funds | Minimum | Other Redemption Restriction
Other Investments [Line Items]
Investment term	2 years
Multi-strategy funds | Maximum
Other Investments [Line Items]
Redemption notice period	95 days	95 days
Event-driven funds
Other Investments [Line Items]
Other investments	$ 37,680	$ 39,177
Percentage of total fair value	4.00%	4.00%
Redemption notice period	45 days	45 days
Direct lending funds
Other Investments [Line Items]
Other investments	$ 261,902	$ 250,681
Percentage of total fair value	26.00%	25.00%
Direct lending funds | Other Redemption Restriction
Other Investments [Line Items]
Unfunded commitments related to other investments	$ 128,000	$ 137,000
Optional extension of investment term	3 years
Direct lending funds | Minimum | Other Redemption Restriction
Other Investments [Line Items]
Investment term	5 years
Direct lending funds | Maximum | Other Redemption Restriction
Other Investments [Line Items]
Investment term	10 years
Private equity funds
Other Investments [Line Items]
Other investments	$ 65,811	$ 68,812
Percentage of total fair value	7.00%	7.00%
Unfunded commitments related to other investments	$ 18,000	$ 21,000
Investment term	10 years
Real estate funds
Other Investments [Line Items]
Other investments	$ 54,720	$ 50,009
Percentage of total fair value	5.00%	5.00%
Real estate funds | Other Redemption Restriction
Other Investments [Line Items]
Unfunded commitments related to other investments	$ 105,000	$ 115,000
Investment term	7 years
CLO-Equities
Other Investments [Line Items]
Other investments	$ 28,556	$ 31,413
Percentage of total fair value	2.00%	2.00%
Other privately held investments
Other Investments [Line Items]
Other investments	$ 48,787	$ 46,430
Percentage of total fair value	5.00%	5.00%
Overseas deposits
Other Investments [Line Items]
Other investments	$ 203,344	$ 198,217
Percentage of total fair value	20.00%	20.00%
Hedge funds | Lockup Redemption Restriction
Other Investments [Line Items]
Fair value of other investments subject to redemption restrictions	$ 25,000	$ 38,000
Percentage of fair value of other investments subject to redemption restrictions	7.00%	11.00%
Bank Revolver Opportunity Funds
Other Investments [Line Items]
Unfunded commitments related to other investments			$ 50,000
Investment term			7 years
Optional extension of investment term			2 years
Open-Ended Commercial Mortgage Income Fund
Other Investments [Line Items]
Unfunded commitments related to other investments		$ 75,000

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INVESTMENTS (Equity Method Investments) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments	$ 0	$ 1,000,000
Equity method investments	$ 108,597,000			$ 108,597,000
Harrington Reinsurance Holdings Limited
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments			$ 108,000,000
Equity method investment, ownership percentage			19.00%
Equity method investment, difference between carrying amount and underlying equity				$ 5,000,000
Other Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments		3,000,000	$ 9,000,000		$ 0
UNITED STATES | Other Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Impairment charge		$ 6,000,000

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INVESTMENTS (Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Investment Income [Line Items]
Gross investment income	$ 107,573	$ 105,857
Investment expenses	(6,574)	(7,193)
Net investment income	100,999	98,664
Fixed maturities
Net Investment Income [Line Items]
Gross investment income	83,958	77,407
Other investments
Net Investment Income [Line Items]
Gross investment income	13,704	18,962
Equity securities
Net Investment Income [Line Items]
Gross investment income	1,758	3,478
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	3,125	2,477
Cash and cash equivalents
Net Investment Income [Line Items]
Gross investment income	4,153	3,095
Short-term investments
Net Investment Income [Line Items]
Gross investment income	$ 875	$ 438

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INVESTMENTS (Net Investment Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Gross realized investment gains	$ 31,628	$ 20,777
Equity securities	17,557	15,783
Gross realized investment gains	49,185	36,560
Gross realized investment losses	(43,535)	(52,935)
Equity securities	1,276	189
Gross realized investment losses	44,811	53,124
Net OTTI recognized in net income	(414)	(6,553)
Change in fair value of investment derivatives	2,023	(1,933)
Net unrealized gains (losses) on equities	(20,813)	0
Total net investment losses	$ (14,830)	$ (25,050)

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INVESTMENTS (OTTI Recognized in Earnings by Asset Class) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net [Line Items]
Total OTTI recognized in net income	$ 414	$ 6,553
Non-U.S. government
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net [Line Items]
Total OTTI recognized in net income	0	4,282
Corporate debt
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net [Line Items]
Total OTTI recognized in net income	414	2,271
Fixed maturities
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net [Line Items]
Total OTTI recognized in net income	$ 414	$ 6,553

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INVESTMENTS (OTTI Recognized in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Credit Losses For Which a Portion of OTTI Was Recognized in AOCI [Roll Forward]
Balance at beginning of period	$ 1,494	$ 1,493
Credit impairments recognized on securities not previously impaired	0	0
Additional credit impairments recognized on securities previously impaired	0	0
Change in timing of future cash flows on securities previously impaired	0	0
Intent to sell of securities previously impaired	0	0
Securities sold/redeemed/matured	(10)	(10)
Balance at end of period	$ 1,484	$ 1,483

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INVESTMENTS (Reverse Repurchase Agreements) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Value of reverse repurchase agreements	$ 24	$ 37
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal	102.00%

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FAIR VALUE MEASUREMENTS (Financial Instruments Measured at Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	$ 11,801,396	$ 12,622,006
Other investments	1,009,587	1,009,373
Short-term investments	56,246	83,661
Derivative instruments (see Note 5)	5,283	5,125
Derivative instruments (see Note 5)	14,381	14,386
U.S. government and agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,796,965	1,712,469
Non-U.S. government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	661,224	806,299
Corporate debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	4,640,431	5,297,866
Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,914,845	2,395,152
CMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,030,621	777,728
Non-Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	41,397	46,831
ABS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,566,698	1,436,281
Municipals
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	149,215	149,380
Fair Value Measurements Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	11,801,396	12,622,006
Fair value based on NAV practical expedient	728,900	733,313
Equity securities	435,742	635,511
Other investments	1,009,587	1,009,373
Short-term investments	56,246	83,661
Derivative instruments (see Note 5)	5,283	5,125
Insurance-linked securities	25,000	25,090
Total Assets	13,333,254	14,380,766
Derivative instruments (see Note 5)	14,381	14,386
Cash settled awards (see Note 8)	8,789	21,535
Total Liabilities	23,170	35,921
Fair Value Measurements Recurring | U.S. government and agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,796,965	1,712,469
Fair Value Measurements Recurring | Non-U.S. government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	661,224	806,299
Fair Value Measurements Recurring | Corporate debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	4,640,431	5,297,866
Fair Value Measurements Recurring | Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,914,845	2,395,152
Fair Value Measurements Recurring | CMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,030,621	777,728
Fair Value Measurements Recurring | Non-Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	41,397	46,831
Fair Value Measurements Recurring | ABS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,566,698	1,436,281
Fair Value Measurements Recurring | Municipals
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	149,215	149,380
Fair Value Measurements Recurring | Common stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	23,942	25,658
Fair Value Measurements Recurring | Exchange-traded funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	262,630	427,633
Fair Value Measurements Recurring | Bond mutual funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	149,170	182,220
Fair Value Measurements Recurring | Hedge funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value based on NAV practical expedient	346,467	363,811
Other investments	346,467	363,811
Fair Value Measurements Recurring | Direct lending funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value based on NAV practical expedient	261,902	250,681
Other investments	261,902	250,681
Fair Value Measurements Recurring | Private equity funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value based on NAV practical expedient	65,811	68,812
Other investments	65,811	68,812
Fair Value Measurements Recurring | Real estate funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value based on NAV practical expedient	54,720	50,009
Other investments	54,720	50,009
Fair Value Measurements Recurring | Other privately held investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	48,787	46,430
Fair Value Measurements Recurring | CLO-Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	28,556	31,413
Fair Value Measurements Recurring | Overseas deposits
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	203,344	198,217
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,769,810	1,658,622
Equity securities	286,572	453,291
Other investments	0	0
Short-term investments	0	0
Derivative instruments (see Note 5)	0	0
Insurance-linked securities	0	0
Total Assets	2,056,382	2,111,913
Derivative instruments (see Note 5)	0	0
Cash settled awards (see Note 8)	0	0
Total Liabilities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,769,810	1,658,622
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | CMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | ABS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipals
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	23,942	25,658
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange-traded funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	262,630	427,633
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Bond mutual funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Direct lending funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private equity funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other privately held investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | CLO-Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Overseas deposits
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	9,988,115	10,910,487
Equity securities	149,170	182,220
Other investments	203,344	198,217
Short-term investments	56,246	83,661
Derivative instruments (see Note 5)	5,283	5,125
Insurance-linked securities	0	0
Total Assets	10,402,158	11,379,710
Derivative instruments (see Note 5)	3,439	2,876
Cash settled awards (see Note 8)	8,789	21,535
Total Liabilities	12,228	24,411
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | U.S. government and agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	27,155	53,847
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Non-U.S. government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	661,224	806,299
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	4,596,960	5,244,969
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,914,845	2,395,152
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | CMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,030,621	777,728
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Non-Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	41,397	46,831
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | ABS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,566,698	1,436,281
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Municipals
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	149,215	149,380
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Common stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Exchange-traded funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Bond mutual funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	149,170	182,220
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Hedge funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Direct lending funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Private equity funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Real estate funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Other privately held investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | CLO-Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Overseas deposits
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	203,344	198,217
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	43,471	52,897
Equity securities	0	0
Other investments	77,343	77,843
Short-term investments	0	0
Derivative instruments (see Note 5)	0	0
Insurance-linked securities	25,000	25,090
Total Assets	145,814	155,830
Derivative instruments (see Note 5)	10,942	11,510
Cash settled awards (see Note 8)	0	0
Total Liabilities	10,942	11,510
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Non-U.S. government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	43,471	52,897
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | CMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Non-Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | ABS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Municipals
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Common stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Exchange-traded funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Bond mutual funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Hedge funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Direct lending funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Private equity funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Real estate funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Other privately held investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	48,787	46,430
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | CLO-Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	28,556	31,413
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Overseas deposits
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments	$ 0	$ 0

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FAIR VALUE MEASUREMENTS (Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value Inputs Assets Quantitative Information [Line Items]
Other investments	$ 1,009,587	$ 1,009,373
Discounted cash flow | Significant Unobservable Inputs (Level 3) | Derivatives - Other underwriting-related derivatives
Fair Value Inputs Assets Quantitative Information [Line Items]
Net derivative assets (liabilities)	$ (10,942)
Discount rate	2.70%
Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Other investments	$ 27,118
Default rates	3.00%
Loss severity rate	35.00%
Collateral spreads	3.00%
Estimated maturity dates	7 years
Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Other investments	$ 48,787
Liquidation value | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Other investments	$ 1,438
Fair value of collateral	100.00%
Minimum | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	3.00%
Minimum | Liquidation value | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount margin	0.10%
Maximum | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	8.50%
Maximum | Liquidation value | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount margin	12.00%
Weighted Average | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Derivatives - Other underwriting-related derivatives
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	2.70%
Weighted Average | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Default rates	3.00%
Loss severity rate	35.00%
Collateral spreads	3.00%
Estimated maturity dates	7 years
Weighted Average | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	7.20%
Weighted Average | Liquidation value | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value of collateral	100.00%
Discount margin	2.10%

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FAIR VALUE MEASUREMENTS (Changes in Level 3 for Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Total liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	$ 11,510	$ 6,500
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(568)	8,686
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	1,435
Closing Balance	10,942	16,621
Change in unrealized investment gain/loss relating to assets held at the reporting date	(568)	7,335
Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	52,897	96,400
Transfers into Level 3	0	0
Transfers out of Level 3	(4,279)	(18,948)
Included in earnings	(118)	58
Included in OCI	1,403	1,434
Purchases	0	15,364
Sales	(2,536)	(15,720)
Settlements/ Distributions	(3,896)	(4,987)
Closing Balance	43,471	73,601
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	77,843	102,842
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	2,362	1,265
Included in OCI	0	0
Purchases	3,111	0
Sales	(1,500)	0
Settlements/ Distributions	(4,473)	(7,337)
Closing Balance	77,343	96,770
Change in unrealized investment gain/loss relating to assets held at the reporting date	2,362	1,265
Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	25,090	27,555
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(90)	758
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	(90)
Closing Balance	25,000	28,223
Change in unrealized investment gain/loss relating to assets held at the reporting date	(90)	758
Total assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	155,830	226,797
Transfers into Level 3	0	0
Transfers out of Level 3	(4,279)	(18,948)
Included in earnings	2,154	2,081
Included in OCI	1,403	1,434
Purchases	3,111	15,364
Sales	(4,036)	(15,720)
Settlements/ Distributions	(8,369)	(12,414)
Closing Balance	145,814	198,594
Change in unrealized investment gain/loss relating to assets held at the reporting date	2,272	2,023
Corporate debt | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	52,897	75,875
Transfers into Level 3	0	0
Transfers out of Level 3	(4,279)	0
Included in earnings	(118)	58
Included in OCI	1,403	(47)
Purchases	0	5,964
Sales	(2,536)	(15,720)
Settlements/ Distributions	(3,896)	(2,342)
Closing Balance	43,471	63,788
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0
CMBS | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	0	3,061
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	0	0
Included in OCI	0	(3)
Purchases	0	9,400
Sales	0	0
Settlements/ Distributions	0	(2,645)
Closing Balance	0	9,813
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0
ABS | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	0	17,464
Transfers into Level 3	0	0
Transfers out of Level 3	0	(18,948)
Included in earnings	0	0
Included in OCI	0	1,484
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	0
Closing Balance	0	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0
Other privately held investments | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	46,430	42,142
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	746	236
Included in OCI	0	0
Purchases	3,111	0
Sales	(1,500)	0
Settlements/ Distributions	0	0
Closing Balance	48,787	42,378
Change in unrealized investment gain/loss relating to assets held at the reporting date	746	236
CLO-Equities | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	31,413	60,700
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	1,616	1,029
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	(4,473)	(7,337)
Closing Balance	28,556	54,392
Change in unrealized investment gain/loss relating to assets held at the reporting date	1,616	1,029
Derivative instruments | Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	11,510	6,500
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(568)	8,686
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	1,435
Closing Balance	10,942	16,621
Change in unrealized investment gain/loss relating to assets held at the reporting date	(568)	7,335
Derivative instruments | Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	0	2,532
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	0	755
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	(90)
Closing Balance	0	3,197
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	755
Insurance-linked securities | Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	25,090	25,023
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(90)	3
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	0
Closing Balance	25,000	25,026
Change in unrealized investment gain/loss relating to assets held at the reporting date	$ (90)	$ 3

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FAIR VALUE MEASUREMENTS (Other Fair Value Narrative) (Details) $ in Millions	Mar. 31, 2018 USD ($) hedge_fund	Dec. 31, 2017 USD ($)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Number of hedge funds with reporting lag | hedge_fund	2
Entities that calculate net asset value per share, reporting lag, percent other investments	44.00%	44.00%
Senior notes	$ 1,377	$ 1,341
Notes payable	36
Estimate of fair value measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	1,366	$ 1,412
Notes payable	$ 36

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DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Asset Fair Value	$ 5,283	$ 5,125
Derivative Liability Fair Value	14,381	14,386
Other assets | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Asset Fair Value	5,283	5,125
Other liabilities | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Liability Fair Value	14,381	14,386
Investment Portfolio | Foreign exchange forward contracts | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Notional Amount	120,762	137,422
Investment Portfolio | Foreign exchange forward contracts | Other assets | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Asset Fair Value	146	10
Investment Portfolio | Foreign exchange forward contracts | Other liabilities | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Liability Fair Value	161	619
Investment Portfolio | Interest rate swaps | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Notional Amount	166,000	191,000
Investment Portfolio | Interest rate swaps | Other assets | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Asset Fair Value	0	448
Investment Portfolio | Interest rate swaps | Other liabilities | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Liability Fair Value	1,379	1,556
Underwriting Portfolio | Foreign exchange forward contracts | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Notional Amount	649,919	698,959
Underwriting Portfolio | Foreign exchange forward contracts | Other assets | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Asset Fair Value	5,137	4,667
Underwriting Portfolio | Foreign exchange forward contracts | Other liabilities | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Liability Fair Value	1,899	701
Underwriting Portfolio | Weather-related contracts | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Notional Amount	0	0
Underwriting Portfolio | Weather-related contracts | Other assets | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Asset Fair Value	0	0
Underwriting Portfolio | Weather-related contracts | Other liabilities | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Liability Fair Value	0	0
Underwriting Portfolio | Other underwriting-related contracts | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Notional Amount	85,000	85,000
Underwriting Portfolio | Other underwriting-related contracts | Other assets | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Asset Fair Value	0	0
Underwriting Portfolio | Other underwriting-related contracts | Other liabilities | Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Liability Fair Value	$ 10,942	$ 11,510

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DERIVATIVE INSTRUMENTS (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative assets - gross amounts	$ 6,703	$ 8,178
Derivative assets - gross amounts offset	(1,420)	(3,053)
Derivative assets- net amounts	5,283	5,125
Derivative liabilities - gross amounts	15,801	17,439
Derivative liabilities - gross amounts offset	(1,420)	(3,053)
Derivative liabilities- net amounts	$ 14,381	$ 14,386

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DERIVATIVE INSTRUMENTS (Other Underwriting-related Risks) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	$ 10,692	$ (12,623)
Investment Portfolio | Foreign exchange forward contracts | Net investment gains (losses)
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	(1,191)	(2,372)
Investment Portfolio | Interest rate swaps | Net investment gains (losses)
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	3,214	439
Underwriting Portfolio | Foreign exchange forward contracts | Foreign exchange losses (gains)
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	7,768	(2,758)
Underwriting Portfolio | Weather-related contracts | Other insurance related income (losses)
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	0	(7,932)
Underwriting Portfolio | Other underwriting-related contracts | Other insurance related income (losses)
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	$ 901	$ 0

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RESERVE FOR LOSSES AND LOSS EXPENSES (Reserve Roll-Forward) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reconciliation of Beginning and Ending Gross Unpaid Losses and Loss Expenses
Gross reserve for losses and loss expenses, beginning of period	$ 12,997,553	$ 9,697,827
Less reinsurance recoverable on unpaid losses, beginning of period	(3,159,514)	(2,276,109)
Net reserve for unpaid losses and loss expenses, beginning of period	9,838,039	7,421,718
Net incurred losses and loss expenses related to:
Current year	715,652	631,735
Prior years	(54,307)	(24,793)
Net incurred losses and loss expenses	661,345	606,942
Net paid losses and loss expenses related to:
Current year	(48,814)	(31,047)
Prior years	(675,393)	(521,478)
Net paid losses and loss expenses	(724,207)	(552,525)
Foreign exchange and other	(726,781)	36,797
Net reserve for unpaid losses and loss expenses, end of period	9,048,396	7,512,932
Reinsurance recoverable on unpaid losses, end of period	2,986,247	2,029,031
Gross reserve for losses and loss expenses, end of period	$ 12,034,643	$ 9,541,963

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RESERVE FOR LOSSES AND LOSS EXPENSES (Prior year development) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development	$ 54,307	$ 24,793
Insurance
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development	22,775	7,865
Reinsurance
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development	$ 31,532	$ 16,928

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RESERVE FOR LOSSES AND LOSS EXPENSES (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended
	Jan. 01, 2018	Feb. 13, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Mar. 20, 2017	Mar. 19, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Current year			$ 715,652	$ 631,735
Insurance and reinsurance balances payable			1,251,629		$ 899,064
Net favorable (adverse) prior year reserve development			54,307	24,793
Short Tail Reserving Class Insurance And Reinsurance Business
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development			38,000	4,000
Reinsurance Credit and Surety
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development			5,000	0
Liability Reinsurance Business
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development			2,000	24,000
Motor Reinsurance Business
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development			3,000	(22,000)
Catastrophe and Weather-related Events
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Current year			35,000	35,000
Discontinued Operations, Disposed of by Means Other than Sale
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claims adjustment expense		$ 223,000
Reduction in reinsurance recoverables on unpaid and paid loses by		$ 223,000
Motor Reserve Class
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ogden rate						(0.75%)	2.50%
Reinsurance
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development			31,532	16,928
Reinsurance | Professional Lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development			9,000	16,000
Insurance
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development			22,775	7,865
Insurance | Professional Lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development			4,000	7,000
Insurance | Liability Insurance Business
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Net favorable (adverse) prior year reserve development			7,000	$ 4,000
Novae Syndicate 2007
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Policyholder benefits and claims incurred, assumed and ceded	$ 819,000
Consideration transferred reinsurance			688,000
Insurance and reinsurance balances payable			$ 131,000

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EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic earnings per common share
Net income	$ 73,202	$ 19,855
Less: preferred share dividends	10,656	14,841
Net income available to common shareholders	$ 62,546	$ 5,014
Weighted average number of common shares outstanding - basic (in shares)	83,322	86,022
Basic earnings per common share (in usd per share)	$ 0.75	$ 0.06
Diluted earnings per common share
Net income available to common shareholders	$ 62,546	$ 5,014
Weighted average number of common shares outstanding - basic (in shares)	83,322	86,022
Share based compensation plans (in shares)	399	771
Weighted average number of common shares outstanding - diluted (in shares)	83,721	86,793
Diluted earnings per common share (in usd per share)	$ 0.75	$ 0.06
Weighted average anti-dilutive shares excluded from the dilutive computation (in shares)	810	551

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SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restricted Stock And Restricted Stock Units
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Share based compensation expense incurred	$ 16	$ 29
Tax benefit related to share-based compensation costs incurred	2	7
Fair value - vested during period	42	120
Unrecognized share-based compensation costs	$ 137	130
Unrecognized share-based compensation costs - weighted average period expected to be recognized	3 years
Restricted Stock And Restricted Stock Units | Cash Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Liability for cash-settled units	$ 9	$ 9
Performance Based Restricted Stock and Restricted Stock Units | Share Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units (in shares) - beginning of period	230
Granted (in shares)	104
Vested (in shares)	(51)
Forfeited (in shares)	0
Nonvested restricted stock units (in shares) - end of period	283
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Weighted average grant date fair value - beginning of period (in usd per share)	$ 57.08
Weighted average grant date fair value - granted (in usd per share)	48.89
Weighted average grant date fair value - vested (in usd per share)	53.81
Weighted average grant date fair value - forfeited (in usd per share)	0.00
Weighted average grant date fair value - end of period (in usd per share)	$ 54.68
Performance Based Restricted Stock and Restricted Stock Units | Cash Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units (in shares) - beginning of period	42
Granted (in shares)	0
Vested (in shares)	(12)
Forfeited (in shares)	0
Nonvested restricted stock units (in shares) - end of period	30
Service Based Restricted Stock And Restricted Stock Units | Share Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units (in shares) - beginning of period	1,355
Granted (in shares)	711
Vested (in shares)	(455)
Forfeited (in shares)	(20)
Nonvested restricted stock units (in shares) - end of period	1,591
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Weighted average grant date fair value - beginning of period (in usd per share)	$ 57.09
Weighted average grant date fair value - granted (in usd per share)	49.07
Weighted average grant date fair value - vested (in usd per share)	54.44
Weighted average grant date fair value - forfeited (in usd per share)	57.45
Weighted average grant date fair value - end of period (in usd per share)	$ 54.18
Service Based Restricted Stock And Restricted Stock Units | Cash Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units (in shares) - beginning of period	988
Granted (in shares)	449
Vested (in shares)	(360)
Forfeited (in shares)	(20)
Nonvested restricted stock units (in shares) - end of period	1,057
2014 Long Term Equity Compensation Plan | Restricted Stock And Restricted Stock Units
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Fair value - vested during period	$ 44
Cliff Vesting | 2014 Long Term Equity Compensation Plan | Restricted Stock And Restricted Stock Units
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Award vesting period	3 years

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SHAREHOLDERS' EQUITY (Common Shares Issued and Outstanding) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued, balance at beginning of period (in shares)	176,580
Total shares issued at end of period (in shares)	176,580
Treasury shares, balance at beginning of period	(93,419)
Total treasury shares at end of period (in shares)	(93,062)
Total shares outstanding (in shares)	83,518		83,161
Common stocks
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued, balance at beginning of period (in shares)	176,580	176,580
Shares issued (in shares)	0	0
Total shares issued at end of period (in shares)	176,580	176,580
Treasury shares, balance at beginning of period	(93,419)	(90,139)
Shares repurchased (in shares)	(149)	(2,229)
Shares reissued (in shares)	506	958
Total treasury shares at end of period (in shares)	(93,062)	(91,410)
Total shares outstanding (in shares)	83,518	85,170

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SHAREHOLDERS' EQUITY (Treasury Shares) (Details) - Common stocks - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Treasury Shares [Line Items]
Total shares (in shares)	149	2,229
Total cost	$ 7,163	$ 151,242
Average price per share (in usd per share)	$ 48.08	$ 67.86
In the Open Market
Treasury Shares [Line Items]
Total shares (in shares)	0	1,896
Total cost	$ 0	$ 127,982
Average price per share (in usd per share)	$ 0.00	$ 67.52
From Employees
Treasury Shares [Line Items]
Total shares (in shares)	149	333
Total cost	$ 7,163	$ 23,260
Average price per share (in usd per share)	$ 48.08	$ 69.80

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DEBT AND FINANCING ARRANGEMENTS (Details) - Letter of Credit	Mar. 28, 2018 USD ($)
LOC Facility
Line of Credit Facility [Line Items]
Line of credit facility	$ 750,000,000
LOC Facility Two
Line of Credit Facility [Line Items]
Line of credit facility	250,000,000
LOC Facility Three
Line of Credit Facility [Line Items]
Line of credit facility	$ 500,000,000

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OTHER COMPREHENSIVE INCOME (LOSS) (Tax Effects of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Before Tax Amount
Other Comprehensive Income (Loss), before Tax	$ (108,517)	$ 126,000
Tax (Expense) Benefit
Other Comprehensive Income (Loss), Tax	(1,619)	(3,460)
Net of Tax Amount
Other Comprehensive Income (Loss), Net of Tax	(110,136)	122,540
Unrealized gains (losses) on available for sale investments, net of tax:
Before Tax Amount
Unrealized investment gains (losses) arising during the period	(105,675)	70,372
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	(4,112)	25,759
Other Comprehensive Income (Loss), before Tax	(109,787)	96,131
Tax (Expense) Benefit
Unrealized investment gains (losses) arising during the period	(6,516)	(2,669)
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	4,897	(791)
Other Comprehensive Income (Loss), Tax	(1,619)	(3,460)
Net of Tax Amount
Unrealized investment gains (losses) arising during the period	(112,191)	67,703
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	785	24,968
Other Comprehensive Income (Loss), Net of Tax	(111,406)	92,671
Cumulative foreign currency translation adjustments, net of tax:
Before Tax Amount
Other Comprehensive Income (Loss), before Tax	1,270	29,869
Tax (Expense) Benefit
Other Comprehensive Income (Loss), Tax	0	0
Net of Tax Amount
Other Comprehensive Income (Loss), Net of Tax	$ 1,270	$ 29,869

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OTHER COMPREHENSIVE INCOME (LOSS) (Reclassifications Out of AOCI Into Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Other investment gains (losses)	$ (14,416)	$ (18,497)
OTTI losses	(414)	(6,553)
Income before income taxes and interest in income (loss) of equity method investments	72,166	16,284
Income tax (expense) benefit	1,036	9,337
Net income available to common shareholders	62,546	5,014
Foreign exchange losses	(37,860)	(21,465)
Non-cash foreign exchange losses	0	24,149	$ 24,000
Unrealized investment gains (losses) on available for sale investments | Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Other investment gains (losses)	4,526	(19,206)
OTTI losses	(414)	(6,553)
Income before income taxes and interest in income (loss) of equity method investments	4,112	(25,759)
Income tax (expense) benefit	(4,897)	791
Net income available to common shareholders	(785)	(24,968)
Foreign currency translation adjustment | Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Income tax (expense) benefit	0	0
Net income available to common shareholders	0	(24,149)
Foreign exchange losses	$ 0	$ (24,149)

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SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands	Apr. 16, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Reinsurance recoverable on unpaid losses, end of period		$ 2,986,247	$ 3,159,514	$ 2,029,031	$ 2,276,109
Subsequent Event
Subsequent Event [Line Items]
Reinsurance recoverable on unpaid losses, end of period	$ 108,000