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 June 30, 2018

or

¨ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from _______ to _______

Commission File Number: 001-36777

JAMES RIVER GROUP HOLDINGS, LTD.

(Exact name of registrant as specified in its charter)

Bermuda	98-0585280
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

Wellesley House, 2nd Floor, 90 Pitts Bay Road, Pembroke HM08, Bermuda

(Address of principal executive offices)

(Zip Code)

(441) 278-4580

(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 for 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 Web site, 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, 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 o Non-accelerated filer o Smaller reporting company o Emerging Growth Company o

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

Number of shares of the registrant's common shares outstanding at August 1, 2018: 29,928,137

James River Group Holdings, Ltd.

Form 10-Q

Index

		Page Number
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements
	Condensed Consolidated Balance Sheets—June 30, 2018 and December 31, 2017	5
	Condensed Consolidated Statements of Income and Comprehensive (Loss) Income—Three and Six Months Ended June 30, 2018 and 2017	7
	Condensed Consolidated Statements of Changes in Shareholders’ Equity—Six Months Ended June 30, 2018 and 2017	8
	Condensed Consolidated Statements of Cash Flows—Six Months Ended June 30, 2018 and 2017	9
	Notes to Condensed Consolidated Financial Statements	10
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	30
	Critical Accounting Policies and Estimates	30
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	51
Item 4.	Controls and Procedures	51
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	51
Item 1A.	Risk Factors	51
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	51
Item 3.	Defaults Upon Senior Securities	51
Item 4.	Mine Safety Disclosure	51
Item 5.	Other Information	51
Item 6.	Exhibits	52
Signatures		53

2

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q, or Quarterly Report, 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. These statements may be identified by the fact that they do not relate strictly to historical or current facts. You may identify forward-looking statements in this Quarterly Report by the use of words such as “anticipates,” “estimates,” “expects,” “intends,” “plans”, “seeks” and “believes,” and similar expressions or future or conditional verbs such as “will,” “should,” “would,” “may” and “could.” These forward-looking statements include, among others, statements relating to our future financial performance, our business prospects and strategy, anticipated financial position, liquidity and capital needs and other similar matters. These forward-looking statements are based on management’s current expectations and assumptions about future events, which are inherently subject to uncertainties, risks and changes in circumstances that are difficult to predict.

Our actual results may differ materially from those expressed in, or implied by, the forward-looking statements included in this Quarterly Report as a result of various factors, many of which are beyond our control, including, among others:

• the inherent uncertainty of estimating reserves and the possibility that incurred losses may be greater than our loss and loss adjustment expense reserves;

• inaccurate estimates and judgments in our risk management may expose us to greater risks than intended;

• the potential loss of key members of our management team or key employees and our ability to attract and retain personnel;

• adverse economic factors resulting in the sale of fewer policies than expected or an increase in the frequency or severity of claims, or both;

• a decline in our financial strength rating resulting in a reduction of new or renewal business;

• reliance on a select group of brokers and agents for a significant portion of our business and the impact of our potential failure to maintain such relationships;

• reliance on a select group of customers for a significant portion of our business and the impact of our potential failure to maintain such relationships;

• changes in laws or government regulation, including tax or insurance law and regulations;

• the recently enacted Public Law No. 115-97, informally titled the Tax Cuts and Jobs Act, may have a significant effect on us including, among other things, by potentially increasing our tax rate, as well as on our shareholders;

• in the event we do not qualify for the insurance company exception to the passive foreign investment company (“PFIC”) rules and are therefore considered a PFIC, there could be material adverse tax consequences to an investor that is subject to U.S. federal income taxation;

• the Company or any of its foreign subsidiaries becoming subject to U.S. federal income taxation;

• a failure of any of the loss limitations or exclusions we utilize to shield us from unanticipated financial losses or legal exposures, or other liabilities;

• losses from catastrophic events which substantially exceed our expectations and/or exceed the amount of reinsurance we have purchased to protect us from such events;

• potential effects on our business of emerging claim and coverage issues;

• exposure to credit risk, interest rate risk and other market risk in our investment portfolio;

• our ability to obtain reinsurance coverage at prices and on terms that allow us to transfer risk and adequately protect our company against financial loss;

• losses resulting from reinsurance counterparties failing to pay us on reinsurance claims or insurance companies with whom we have a fronting arrangement failing to pay us for claims;

• the potential impact of internal or external fraud, operational errors, systems malfunctions or cyber security incidents;

• our ability to manage our growth effectively;

• inadequacy of premiums we charge to compensate us for our losses incurred;

3

• failure to maintain effective internal controls in accordance with Sarbanes-Oxley Act of 2002, as amended (“Sarbanes-Oxley”); and

• changes in our financial condition, regulations or other factors that may restrict our subsidiaries’ ability to pay us dividends.

Additional information about these risks and uncertainties, as well as others that may cause actual results to differ materially from those in the forward-looking statements, is contained in our filings with the U.S. Securities and Exchange Commission ("SEC"), including our Annual Report on Form 10-K filed with the SEC on March 1, 2018.

Forward-looking statements speak only as of the date of this Quarterly Report. Except as expressly required under federal securities laws and the rules and regulations of the SEC, we do not have any obligation, and do not undertake, to update any forward-looking statements to reflect events or circumstances arising after the date of this Quarterly Report, whether as a result of new information or future events or otherwise. You should not place undue reliance on the forward-looking statements included in this Quarterly Report or that may be made elsewhere from time to time by us, or on our behalf. All forward-looking statements attributable to us are expressly qualified by these cautionary statements.

4

PART 1. FINANCIAL INFORMATION

 Item 1. Financial Statements

JAMES RIVER GROUP HOLDINGS, LTD. AND SUBSIDIARIES

Condensed Consolidated Balance Sheets

	(Unaudited) June 30, 2018		December 31, 2017
	(in thousands)
Assets
Invested assets:
Fixed maturity securities:
Available-for-sale, at fair value (amortized cost:  2018 – $1,039,778; 2017 – $1,008,662)	$	1,021,387	$	1,016,098
Trading, at fair value (amortized cost:  2018 – $0; 2017 – $3,801)	—		3,808
Equity securities available-for-sale, at fair value (cost:  2018 – $77,995; 2017 – $75,318)	84,009		82,522
Bank loan participations held-for-investment, at amortized cost, net of allowance	253,689		238,214
Short-term investments	25,140		36,804
Other invested assets	76,813		70,208
Total invested assets	1,461,038		1,447,654
Cash and cash equivalents	267,367		163,495
Accrued investment income	9,502		8,381
Premiums receivable and agents’ balances, net	341,391		352,436
Reinsurance recoverable on unpaid losses	375,535		302,524
Reinsurance recoverable on paid losses	13,365		11,292
Prepaid reinsurance premiums	101,182		91,979
Deferred policy acquisition costs	65,462		72,365
Intangible assets, net	38,036		38,334
Goodwill	181,831		181,831
Other assets	82,667		86,404
Total assets	$	2,937,376	$	2,756,695

See accompanying notes.

5

JAMES RIVER GROUP HOLDINGS, LTD. AND SUBSIDIARIES

Condensed Consolidated Balance Sheets (continued)

	(Unaudited) June 30, 2018			December 31, 2017
	(in thousands, except share amounts)
Liabilities and Shareholders’ Equity
Liabilities:
Reserve for losses and loss adjustment expenses	$	1,468,353		$	1,292,349
Unearned premiums	417,771			418,114
Payables to reinsurers	69,812			56,268
Senior debt	98,300			98,300
Junior subordinated debt	104,055			104,055
Accrued expenses	40,342			39,295
Other liabilities	49,500			53,615
Total liabilities	2,248,133			2,061,996
Commitments and contingent liabilities
Shareholders’ equity:
Common Shares – 2018 and 2017: $0.0002 par value; 200,000,000 shares authorized; 29,917,821 and 29,696,682 shares issued and outstanding, respectively	6			6
Preferred Shares – 2018 and 2017: $0.00125 par value; 20,000,000 shares authorized; no shares issued and outstanding	—			—
Additional paid-in capital	641,290			636,149
Retained earnings	66,677			48,198
Accumulated other comprehensive (loss) income	(18,730		)	10,346
Total shareholders’ equity	689,243			694,699
Total liabilities and shareholders’ equity	$	2,937,376		$	2,756,695

See accompanying notes.

6

JAMES RIVER GROUP HOLDINGS, LTD. AND SUBSIDIARIES

Condensed Consolidated Statements of Income and Comprehensive (Loss) Income (Unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands, except share amounts)
Revenues
Gross written premiums	$	293,378		$	281,475		$	591,494		$	505,654
Ceded written premiums	(104,772		)	(73,651		)	(191,910		)	(139,920		)
Net written premiums	188,606			207,824			399,584			365,734
Change in net unearned premiums	19,604			(23,747		)	9,568			(26,970		)
Net earned premiums	208,210			184,077			409,152			338,764
Net investment income	16,135			13,714			29,391			30,447
Net realized and unrealized (losses) gains on investments	(64		)	307			(874		)	1,354
Other income	3,760			4,296			8,716			8,231
Total revenues	228,041			202,394			446,385			378,796
Expenses
Losses and loss adjustment expenses	154,595			131,084			298,367			236,453
Other operating expenses	51,751			53,036			106,534			101,929
Other expenses	93			346			97			232
Interest expense	2,946			2,224			5,468			4,347
Amortization of intangible assets	149			149			298			298
Total expenses	209,534			186,839			410,764			343,259
Income before taxes	18,507			15,555			35,621			35,537
Income tax expense	1,523			1,014			3,004			2,546
Net income	16,984			14,541			32,617			32,991
Other comprehensive (loss) income:
Net unrealized (losses) gains, net of taxes of $(183) and $(727) in 2018 and $1,157 and $2,671 in 2017	(6,558		)	6,708			(25,105		)	10,742
Total comprehensive income	$	10,426		$	21,249		$	7,512		$	43,733
Per share data:
Basic earnings per share	$	0.57		$	0.49		$	1.09		$	1.12
Diluted earnings per share	$	0.56		$	0.48		$	1.08		$	1.09
Dividend declared per share	$	0.30		$	0.30		$	0.60		$	0.60
Weighted-average common shares outstanding:
Basic	29,882,988			29,406,877			29,823,982			29,348,557
Diluted	30,293,933			30,307,099			30,243,946			30,317,585

See accompanying notes.

7

JAMES RIVER GROUP HOLDINGS, LTD. AND SUBSIDIARIES

Condensed Consolidated Statements of Changes in Shareholders’ Equity (Unaudited)

	Number of Common Shares Outstanding	Class A Common Stock		Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Income			Total
	(in thousands, except share amounts)
Balances at December 31, 2016	29,257,566	$	6	$	636,856		$	55,232		$	1,127		$	693,221
Net income	—	—		—			32,991			—			32,991
Other comprehensive income	—	—		—			—			10,742			10,742
Dividends	—	—		—			(17,728		)	—			(17,728		)
Exercise of stock options	185,159	—		(2,458		)	—			—			(2,458		)
Vesting of RSUs	24,922	—		(627		)	—			—			(627		)
Compensation expense under share incentive plans	—	—		3,578			—			—			3,578
Balances at June 30, 2017	29,467,647	$	6	$	637,349		$	70,495		$	11,869		$	719,719
Balances at December 31, 2017	29,696,682	$	6	$	636,149		$	48,198		$	10,346		$	694,699
Net income	—	—		—			32,617			—			32,617
Other comprehensive loss	—	—		—			—			(25,105		)	(25,105		)
Dividends	—	—		—			(18,109		)	—			(18,109		)
Exercise of stock options	177,835	—		2,803			—			—			2,803
Vesting of RSUs	43,304	—		(777		)	—			—			(777		)
Compensation expense under share incentive plans	—	—		3,115			—			—			3,115
Cumulative effect of adoption of ASU No. 2016-01, net of taxes	—	—		—			4,682			(4,682		)	—
Cumulative effect of adoption of ASU No. 2018-02	—	—		—			(711		)	711			—
Balances at June 30, 2018	29,917,821	$	6	$	641,290		$	66,677		$	(18,730	)	$	689,243

See accompanying notes.

8

JAMES RIVER GROUP HOLDINGS, LTD. AND SUBSIDIARIES

Condensed Consolidated Statements of Cash Flows (Unaudited)

	Six Months Ended June 30,
	2018			2017
	(in thousands)
Operating activities
Net cash provided by operating activities	$	164,086		$	65,326
Investing activities
Securities available-for-sale:
Purchases – fixed maturity securities	(178,600		)	(196,208		)
Sales – fixed maturity securities	65,275			33,723
Maturities and calls – fixed maturity securities	81,138			128,640
Purchases – equity securities	(5,949		)	—
Sales – equity securities	3,179			409
Bank loan participations:
Purchases	(121,285		)	(144,172		)
Sales	77,933			79,959
Maturities	28,053			28,638
Other invested assets:
Purchases	(6,993		)	(6,322		)
Return of capital	308			—
Short-term investments, net	11,664			9,496
Securities receivable or payable, net	2,015			1,205
Purchases of property and equipment	(470		)	(1,426		)
Net cash used in investing activities	(43,732		)	(66,058		)
Financing activities
Dividends paid	(18,042		)	(17,729		)
Issuance of common shares under equity incentive plans	3,900			868
Common share repurchases	(1,874		)	(3,953		)
Other financing activities	(466		)	(467		)
Net cash used in financing activities	(16,482		)	(21,281		)
Change in cash and cash equivalents	103,872			(22,013		)
Cash and cash equivalents at beginning of period	163,495			109,784
Cash and cash equivalents at end of period	$	267,367		$	87,771
Supplemental information
Interest paid	$	5,368		$	4,329

See accompanying notes.

9

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements

1.    Accounting Policies

Organization

James River Group Holdings, Ltd. (referred to as “JRG Holdings” or, with its subsidiaries, the “Company”) is an exempted holding company registered in Bermuda, organized for the purpose of acquiring and managing insurance and reinsurance entities.

The Company owns six insurance companies based in the United States (“U.S.”) focused on specialty insurance niches and two Bermuda-based reinsurance companies as described below:

• James River Group Holdings UK Limited (“James River UK”) is an insurance holding company formed in 2015 in the United Kingdom (“U.K.”). JRG Holdings contributed James River Group, Inc. (“James River Group”), a U.S. insurance holding company, to James River UK in 2015.

• James River Group is a Delaware domiciled insurance holding company formed in 2002 which owns all of the Company’s U.S.-based subsidiaries, either directly or indirectly through one of its wholly-owned U.S. subsidiaries. James River Group oversees the Company’s U.S. insurance operations and maintains all of the outstanding debt in the U.S.

• James River Insurance Company is an Ohio domiciled excess and surplus lines insurance company that, with its wholly-owned insurance subsidiary, James River Casualty Company, is authorized to write business in every state and the District of Columbia.

• Falls Lake National Insurance Company (“Falls Lake National”) is an Ohio domiciled insurance company which wholly owns Stonewood Insurance Company (“Stonewood Insurance”), a North Carolina domiciled company, Falls Lake General Insurance Company, an Ohio domiciled company, and Falls Lake Fire and Casualty Company, a California domiciled company. Falls Lake National began writing specialty admitted fronting and program business in late 2013. Falls Lake Fire and Casualty began operations in 2016.

• JRG Reinsurance Company Ltd. (“JRG Re”) was formed in 2007 and commenced operations in 2008. JRG Re, a Bermuda domiciled reinsurer, primarily provides non-catastrophe casualty reinsurance to U.S. third parties.

• Carolina Re Ltd (“Carolina Re”) was formed in 2018 and provides reinsurance to the Company’s U.S.-based insurance subsidiaries. Carolina Re is a party to a stop loss reinsurance treaty with JRG Re.

Basis of Presentation

The accompanying condensed consolidated financial statements and notes have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and do not contain all of the information and footnotes required by U.S. GAAP for complete financial statements. The condensed consolidated financial statements include the results of the Company and its subsidiaries from their respective dates of inception or acquisition, as applicable. Readers are urged to review the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for a more complete description of the Company’s business and accounting policies. In the opinion of management, all adjustments necessary for a fair presentation of the condensed consolidated financial statements have been included. Such adjustments consist only of normal recurring items. Interim results are not necessarily indicative of results of operations for the full year. The consolidated balance sheet as of December 31, 2017 was derived from the Company’s audited annual consolidated financial statements.

Intercompany transactions and balances have been eliminated.

Estimates and Assumptions

Preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying disclosures. Those estimates are inherently subject to change, and actual results may ultimately differ from those estimates.

Variable Interest Entities

Entities that do not have sufficient equity at risk to allow the entity to finance its activities without additional financial support or in which the equity investors, as a group, do not have the characteristic of a controlling financial interest are referred to as variable interest entities (“VIE”). A VIE is consolidated by the variable interest holder that is determined to have the controlling financial interest (primary beneficiary) as a result of having both the power to direct the activities of a VIE that most significantly impact the VIE’s economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE’s capital structure, contractual terms, nature of the VIE’s operations

10

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

and purpose, and the Company’s relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE. The Company reassesses its VIE determination with respect to an entity on an ongoing basis.

The Company holds interests in VIEs through certain equity method investments included in “other invested assets” in the accompanying condensed consolidated balance sheets. The Company has determined that it should not consolidate any of the VIEs as it is not the primary beneficiary in any of the relationships. Although the investments resulted in the Company holding variable interests in the entities, they did not empower the Company to direct the activities that most significantly impact the economic performance of the entities. The Company’s investments related to these VIEs totaled $32.2 million and $32.1 million as of June 30, 2018 and December 31, 2017, respectively, representing the Company’s maximum exposure to loss.

Income Tax Expense

Our effective tax rate fluctuates from period to period based on the relative mix of income reported by country and the respective tax rates imposed by each tax jurisdiction. For the three months ended June 30, 2018 and 2017, our U.S. federal income tax expense was 8.2% and 6.5% of income before taxes, respectively (8.4% and 7.2% for the six months ended June 30, 2018 and 2017, respectively). For U.S.-sourced income, the Company’s U.S. federal income tax expense differs from the amounts computed by applying the federal statutory income tax rate (21% in 2018 and 35% in 2017) to income before taxes due primarily to interest income on tax-advantaged state and municipal securities (state and municipal securities represent 12.5% and 12.3% of our available-for-sale securities at June 30, 2018 and 2017, respectively), dividends received income, and excess tax benefits on share based compensation.

Financial results reflect provisional amounts related to the December 2017 enactment of the Tax Cuts and Jobs Act of 2017 (the “Tax Act”). These provisional estimates are based on the Company’s initial analysis and current interpretation of the legislation. Given the complexity of the legislation, anticipated guidance from the U.S. Treasury, and the potential for additional guidance from the SEC or the Financial Accounting Standards Board (“FASB”), these estimates may be adjusted during 2018.

Adopted Accounting Standards

Effective January 1, 2018, the Company adopted Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606). The guidance applies to all companies that either enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards, such as insurance contracts. Under this guidance, a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. Judgments required in adopting this update may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The adoption of ASU 2014-09 had no impact on reported fee income and there was no cumulative effect of initially applying the update.

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. Among other things, this ASU requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. Upon adoption on January 1, 2018, the Company made a $4.7 million cumulative-effect adjustment to increase retained earnings and reduce accumulated other comprehensive income. The adoption of ASU 2016-01 did not materially impact the Company's financial position, cash flows, or total comprehensive income. The Company's results of operations were impacted as changes in fair value of equity instruments are now presented in net income rather than other comprehensive (loss) income. For the three and six months ended June 30, 2018, the respective impact on net income was an increase of $451,000 ($0.02 and $0.01 increase in basic and diluted earnings per share, respectively) and a reduction of $922,000 ($0.03 reduction in basic and diluted earnings per share).

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. This update was issued as a result of the enactment of the Tax Act on December 22, 2017. The ASU allows for the option to reclassify the stranded tax effects resulting from the implementation of the Tax Act out of accumulated other comprehensive income and into retained earnings. As the adoption of ASU 2016-01 in 2018 resulted in the reclassification of the entire unrealized balance on equity securities from accumulated other comprehensive income into retained earnings, only the stranded tax effects on the unrealized balances of fixed income securities were impacted by the adoption of ASU 2018-02. The reclassification resulted in a $711,000 decrease to the Company's retained earnings with a corresponding increase to accumulated other comprehensive income in the first quarter of 2018.

11

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

Prospective Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). Under current guidance for lessees, leases are only included on the balance sheet if certain criteria, classifying the agreement as a capital lease, are met. This update will require the recognition of a right-of-use asset and a corresponding lease liability, discounted to the present value, for all leases that extend beyond 12 months. This ASU is effective for annual and interim reporting periods beginning after December 15, 2018. Upon adoption, leases will be recognized and measured at the beginning of the earliest period presented using a modified retrospective approach. The Company is currently evaluating ASU 2016-02 to determine the potential impact that adopting this standard will have on its financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. Current GAAP delays the recognition of credit losses until it is probable a loss has been incurred. The update will require financial assets measured at amortized cost, such as bank loan participations held for investment, to be presented at the net amount expected to be collected by means of an allowance for credit losses that runs through net income. Credit losses relating to available-for-sale debt securities will also be recorded through an allowance for credit losses, with the amount of the allowance limited to the amount by which fair value is below amortized cost. This ASU is effective for annual and interim reporting periods beginning after December 15, 2019. Upon adoption, this ASU will be applied using the modified-retrospective approach, by which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period presented. The Company has not yet completed the analysis of how adopting this ASU will affect the Company’s financial statements.

12

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

2.    Investments

The Company’s available-for-sale investments are summarized as follows:

	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
June 30, 2018
Fixed maturity securities:
State and municipal	$	137,055	$	3,590	$	(2,272	)	$	138,373
Residential mortgage-backed	190,574		445		(6,268		)	184,751
Corporate	439,993		1,655		(11,303		)	430,345
Commercial mortgage and asset-backed	177,286		85		(2,929		)	174,442
Obligations of U.S. government corporations and agencies	5,702		—		(13		)	5,689
U.S. Treasury securities and obligations guaranteed by the U.S. government	87,143		26		(1,372		)	85,797
Redeemable preferred stock	2,025		—		(35		)	1,990
Total fixed maturity securities	1,039,778		5,801		(24,192		)	1,021,387
Equity securities	77,995		6,675		(661		)	84,009
Total investments available-for-sale	$	1,117,773	$	12,476	$	(24,853	)	$	1,105,396
December 31, 2017
Fixed maturity securities:
State and municipal	$	139,382	$	5,587	$	(603	)	$	144,366
Residential mortgage-backed	160,379		723		(2,441		)	158,661
Corporate	408,857		7,503		(2,639		)	413,721
Commercial mortgage and asset-backed	182,595		714		(698		)	182,611
Obligations of U.S. government corporations and agencies	35,948		—		(101		)	35,847
U.S. Treasury securities and obligations guaranteed by the U.S. government	79,476		37		(639		)	78,874
Redeemable preferred stock	2,025		—		(7		)	2,018
Total fixed maturity securities	1,008,662		14,564		(7,128		)	1,016,098
Equity securities	75,318		7,830		(626		)	82,522
Total investments available-for-sale	$	1,083,980	$	22,394	$	(7,754	)	$	1,098,620

The amortized cost and fair value of available-for-sale investments in fixed maturity securities at June 30, 2018 are summarized, by contractual maturity, as follows:

	Cost or Amortized Cost		Fair Value
	(in thousands)
One year or less	$	40,895	$	40,760
After one year through five years	317,761		312,999
After five years through ten years	193,545		187,368
After ten years	117,692		119,077
Residential mortgage-backed	190,574		184,751
Commercial mortgage and asset-backed	177,286		174,442
Redeemable preferred stock	2,025		1,990
Total	$	1,039,778	$	1,021,387

Actual maturities may differ for some securities because borrowers have the right to call or prepay obligations with or without penalties.

13

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

The following table shows the Company’s gross unrealized losses and fair value for available-for-sale securities aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position:

	Less Than 12 Months					12 Months or More					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in thousands)
June 30, 2018
Fixed maturity securities:
State and municipal	$	62,247	$	(1,800	)	$	10,402	$	(472	)	$	72,649	$	(2,272	)
Residential mortgage-backed	91,518		(2,123		)	76,384		(4,145		)	167,902		(6,268		)
Corporate	292,519		(7,730		)	57,914		(3,573		)	350,433		(11,303		)
Commercial mortgage and asset-backed	112,250		(2,194		)	20,388		(735		)	132,638		(2,929		)
Obligations of U.S. government corporations and agencies	—		—			5,689		(13		)	5,689		(13		)
U.S. Treasury securities and obligations guaranteed by the U.S. government	70,158		(1,115		)	13,397		(257		)	83,555		(1,372		)
Redeemable preferred stock	1,990		(35		)	—		—			1,990		(35		)
Total fixed maturity securities	630,682		(14,997		)	184,174		(9,195		)	814,856		(24,192		)
Equity securities	10,128		(262		)	5,627		(399		)	15,755		(661		)
Total investments available-for-sale	$	640,810	$	(15,259	)	$	189,801	$	(9,594	)	$	830,611	$	(24,853	)
December 31, 2017
Fixed maturity securities:
State and municipal	$	40,117	$	(318	)	$	10,662	$	(285	)	$	50,779	$	(603	)
Residential mortgage-backed	50,447		(261		)	84,193		(2,180		)	134,640		(2,441		)
Corporate	113,464		(846		)	66,954		(1,793		)	180,418		(2,639		)
Commercial mortgage and asset-backed	53,965		(244		)	25,299		(454		)	79,264		(698		)
Obligations of U.S. government corporations and agencies	3,024		(1		)	32,154		(100		)	35,178		(101		)
U.S. Treasury securities and obligations guaranteed by the U.S. government	50,760		(430		)	26,707		(209		)	77,467		(639		)
Redeemable preferred stock	2,018		(7		)	—		—			2,018		(7		)
Total fixed maturity securities	313,795		(2,107		)	245,969		(5,021		)	559,764		(7,128		)
Equity securities	5,859		(65		)	5,665		(561		)	11,524		(626		)
Total investments available-for-sale	$	319,654	$	(2,172	)	$	251,634	$	(5,582	)	$	571,288	$	(7,754	)

The Company held securities of 219 issuers that were in an unrealized loss position at June 30, 2018 with a total fair value of $830.6 million and gross unrealized losses of $24.9 million. None of the fixed maturity securities with unrealized losses has ever missed, or been delinquent on, a scheduled principal or interest payment.

At June 30, 2018, 100.0% of the Company’s fixed maturity security portfolio was rated “BBB-” or better (“investment grade”) by Standard & Poor’s or received an equivalent rating from another nationally recognized rating agency.

Management concluded that none of the fixed maturity securities with an unrealized loss at June 30, 2018 or December 31, 2017 experienced an other-than-temporary impairment. Management does not intend to sell available-for-sale securities in an unrealized loss position, and it is not “more likely than not” that the Company will be required to sell these securities before a recovery in their value to their amortized cost basis occurs.

At December 31, 2017, management concluded that one equity security, based on the severity and duration of the impairment, had experienced an other-than-temporary impairment. Accordingly, the Company recorded an impairment loss of $1.5 million in 2017. Management concluded that none of the other equity securities with an unrealized loss at December 31, 2017 experienced an other-than-temporary impairment.

14

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

At December 31, 2017, the Company held a participation in a loan with unpaid principal of $807,000 issued by a company that produces and supplies power to Puerto Rico through a power purchase agreement with Puerto Rico Electric Power Authority (“PREPA”), a public corporation and governmental agency of the Commonwealth of Puerto Rico. Management concluded that an allowance for credit losses should be established on the loan at December 31, 2017 to reduce its carrying value to $0. In the first quarter of 2018, the full outstanding principal on the loan was repaid and the Company recognized a realized gain of $807,000 on the repayment.

Management concluded that certain loans in the Company's bank loan portfolio were impaired as of June 30, 2018. The aggregate allowance for credit losses was $1.2 million at June 30, 2018 on impaired loans from three issuers with a total carrying value of $2.2 million and unpaid principal of $3.5 million. At December 31, 2017, the aggregate allowance for credit losses was $3.2 million on impaired loans from five issuers with a total carrying value of $5.1 million and unpaid principal of $8.4 million. The aggregate allowance for credit losses on impaired loans was $705,000 at June 30, 2017 and $943,000 at December 31, 2016.

Bank loan participations generally have a credit rating that is below investment grade (i.e. below “BBB-” for Standard & Poor’s) at the date of purchase. These bank loans are primarily senior, secured floating-rate debt rated “BB”, “B”, or “CCC” by Standard & Poor’s or an equivalent rating from another nationally recognized rating agency. These bank loans include assignments of, and participations in, performing and non-performing senior corporate debt generally acquired through primary bank syndications and in secondary markets. Bank loans consist of, but are not limited to, term loans, the funded and unfunded portions of revolving credit loans, and other similar loans and investments. Management believed that it was probable at the time that these loans were acquired that the Company would be able to collect all contractually required payments receivable.

Generally, the accrual of interest on a bank loan participation is discontinued when the contractual payment of principal or interest has become 90 days past due or management has serious doubts about further collectability of principal or interest. A bank loan participation may remain on accrual status if it is in the process of collection and is either guaranteed or well secured. Generally, bank loan participations are restored to accrual status when the obligation is brought current, has performed in accordance with the contractual terms for a reasonable period of time, and the ultimate collectability of the total contractual principal and interest is no longer in doubt. Interest received on nonaccrual loans generally is reported as investment income. There were no bank loans on nonaccrual status at June 30, 2018 or December 31, 2017.

The allowance for credit losses is maintained at a level believed adequate by management to absorb estimated probable credit losses. Management’s periodic evaluation of the adequacy of the allowance is based on consultations and advice of the Company’s independent investment manager, known and inherent risks in the portfolio, adverse situations that may affect the borrower’s ability to repay, the estimated value of any underlying collateral, current economic conditions, and other relevant factors. The Company generally records an allowance equal to the difference between the fair value and the amortized cost of bank loans that it has determined to be impaired as a practical expedient for an estimate of probable future cash flows to be collected on those bank loans. Bank loans are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote.

The average recorded investment in impaired bank loans was $3.7 million and $5.0 million during the six months ended June 30, 2018 and 2017, respectively. Investment income of $65,000 and $179,000, respectively, was recognized during the time within those periods that the loans were impaired. The Company recorded net realized investment losses of $896,000 and $893,000 in the three and six months ended June 30, 2018, respectively, for changes in the fair value of impaired bank loans ($42,000 of net realized investment losses and $135,000 of net realized investment gains in the three and six months ended June 30, 2017, respectively).

Changes in unrealized gains or losses on securities held for trading are recorded as trading gains or losses within net investment income. Net investment income for the three and six months ended June 30, 2018 includes $1,000 and $4,000 of net trading losses, respectively, all relating to securities sold during the three and six months ended June 30, 2018.

15

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

The Company’s net realized and unrealized gains and losses on investments are summarized as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Fixed maturity securities:
Gross realized gains	$	360		$	18		$	382		$	356
Gross realized losses	(252		)	(31		)	(475		)	(327		)
	108			(13		)	(93		)	29
Bank loan participations:
Gross realized gains	360			471			1,580			1,607
Gross realized losses	(1,006		)	(150		)	(1,106		)	(689		)
	(646		)	321			474			918
Equity securities:
Gross realized gains	—			—			—			409
Gross realized losses	(47		)	—			(62		)	—
Changes in fair values of equity securities	521			—			(1,189		)	—
	474			—			(1,251		)	409
Short-term investments and other:
Gross realized gains	—			—			—			—
Gross realized losses	—			(1		)	(4		)	(2		)
	—			(1		)	(4		)	(2		)
Total	$	(64	)	$	307		$	(874	)	$	1,354

Realized investment gains or losses are determined on a specific identification basis. 

The Company invests selectively in private debt and equity opportunities. These investments, which together comprise the Company’s other invested assets, are primarily focused in renewable energy, limited partnerships, and bank holding companies.

	Carrying Value				Investment Income
	June 30,		December 31,		Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017		2018		2017
	(in thousands)
Renewable energy LLCs (a)	$	32,204	$	32,063	$	530	$	1,521	$	1,741	$	7,115
Renewable energy notes receivable (b)	8,750		7,278		328		49		625		49
Limited partnerships (c)	31,359		26,367		1,092		703		1,319		1,085
Bank holding companies (d)	4,500		4,500		86		86		172		172
Total other invested assets	$	76,813	$	70,208	$	2,036	$	2,359	$	3,857	$	8,421

(a) The Company’s Corporate and Other segment owns equity interests ranging from 2.6% to 32.8% in various LLCs whose principal objective is capital appreciation and income generation from owning and operating renewable energy production facilities (wind and solar). The LLCs are managed by an affiliate of the Company and the Company’s Non-Executive Chairman has invested in certain of these LLCs. The equity method is used to account for the Company’s LLC investments. Income for the LLCs primarily reflects adjustments to the carrying values of investments in renewable energy projects to their determined fair values. The fair value adjustments are included in revenues for the LLCs. Expenses for the LLCs are not significant and are comprised of administrative and interest expenses. The Company received cash distributions from these investments totaling $2.1 million and $3.6 million in the six months ended June 30, 2018 and 2017, respectively.

(b) The Company has invested in notes receivable for renewable energy projects. At June 30, 2018, the Company holds an $8.8 million note issued by an affiliate of the Company. Interest on the note, which matures in 2021, is fixed at 15.0%. Interest income

16

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

on the note was $328,000 and $625,000 for the three and six months ended June 30, 2018, respectively ($49,000 for the three and six months ended June 30, 2017).

(c) The Company owns investments in limited partnerships that invest in concentrated portfolios including publicly-traded small cap equities, loans of middle market private equity sponsored companies, equity tranches of collateralized loan obligations (“CLOs”), and tranches of distressed home loans. Income from the partnerships is recognized under the equity method of accounting. The Company’s Corporate and Other segment held an investment in a limited partnership with a carrying value of $3.2 million at June 30, 2018. The Company recognized investment income of $333,000 and $208,000 on the investment for the three and six months ended June 30, 2018, respectively ($152,000 and $220,000for the three and six months ended June 30, 2017, respectively). The Company’s Excess and Surplus Lines segment holds investments in limited partnerships of $28.1 million at June 30, 2018. Investment income of $759,000 and $1.1 million was recognized on the investments for the three and six months ended June 30, 2018, respectively ($551,000 and $865,000for the three and six months ended June 30, 2017, respectively). At June 30, 2018, the Company’s Excess and Surplus Lines segment has outstanding commitments to invest another $625,000 in these limited partnerships.

(d) The Company holds $4.5 million of subordinated notes issued by a bank holding company. Interest on the notes, which mature on August 12, 2023, is fixed at 7.6% per annum. Interest income on the notes was $86,000 and $172,000, respectively, in both the three and six months ended June 30, 2018 and 2017. The Company’s Non-Executive Chairman was previously the Lead Independent Director of the bank holding company and an investor in the bank holding company. Additionally, one of the Company’s directors was an investor in the bank holding company and is currently a lender to the bank holding company.

At June 30, 2018, the Company held an investment in a CLO where one of the underlying loans was issued by the bank holding company. The investment, with a carrying value of $4.7 million at June 30, 2018, is classified as an available-for-sale fixed maturity.

The Company previously held common shares issued by the bank holding company. Realized investments gains of $409,000 were recognized in the six months ended June 30, 2017 related to the sale of common shares of the bank holding company.

The Company holds a $1.0 million certificate of deposit issued by the bank holding company. The certificate of deposit, which matures on December 19, 2018, is carried as a short-term investment. Interest income of $3,000 was recognized on this investment for the six months ended June 30, 2018 and 2017.

3.    Goodwill and Intangible Assets

On December 11, 2007, the Company completed an acquisition of James River Group by acquiring 100% of the outstanding shares of James River Group common stock, referred to herein as the “Merger”. The transaction was accounted for under the purchase method of accounting, and goodwill and intangible assets were recognized by the Company as a result of the transaction. Goodwill resulting from the Merger was $181.8 million at June 30, 2018 and December 31, 2017.

The gross carrying amounts and accumulated amortization for each major specifically identifiable intangible asset class were as follows: 

		June 30, 2018				December 31, 2017
	Life (Years)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
		($ in thousands)
Intangible Assets
Trademarks	Indefinite	$	22,200	$	—	$	22,200	$	—
Insurance licenses and authorities	Indefinite	9,164		—		9,164		—
Identifiable intangibles not subject to amortization		31,364		—		31,364		—
Broker relationships	24.6	11,611		4,939		11,611		4,641
Identifiable intangible assets subject to amortization		11,611		4,939		11,611		4,641
		$	42,975	$	4,939	$	42,975	$	4,641

17

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

4.    Earnings Per Share

The following represents a reconciliation of the numerator and denominator of the basic and diluted earnings per share computations contained in the condensed consolidated financial statements:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands, except share and per share amounts)
Net income to shareholders	$	16,984		$	14,541		$	32,617		$	32,991
Weighted average common shares outstanding:
Basic	29,882,988			29,406,877			29,823,982			29,348,557
Common share equivalents	410,945			900,222			419,964			969,028
Diluted	30,293,933			30,307,099			30,243,946			30,317,585
Earnings per share:
Basic	$	0.57		$	0.49		$	1.09		$	1.12
Common share equivalents	(0.01		)	(0.01		)	(0.01		)	(0.03		)
Diluted	$	0.56		$	0.48		$	1.08		$	1.09

Common share equivalents relate to stock options and restricted share units (“RSU’s”). For the three and six months ended June 30, 2018, common share equivalents of 182,246 and 187,502 shares, respectively, were excluded from the calculations of diluted earnings per share as their effects were anti-dilutive. For the three and six months ended June 30, 2017, common share equivalents of 201,821 and 150,075 shares, respectively, were excluded from the calculations of diluted earnings per share as their effects were anti-dilutive.

18

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

5.    Reserve for Losses and Loss Adjustment Expenses

The following table provides a reconciliation of the beginning and ending reserve balances for losses and loss adjustment expenses, net of reinsurance, to the gross amounts reported in the condensed consolidated balance sheets:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018			2017
	(in thousands)
Reserve for losses and loss adjustment expenses net of reinsurance recoverables at beginning of period	$	1,038,303	$	791,781	$	989,825		$	761,128
Add: Incurred losses and loss adjustment expenses net of reinsurance:
Current year	152,371		129,369		298,753			238,152
Prior years	2,224		1,715		(386		)	(1,699		)
Total incurred losses and loss and adjustment expenses	154,595		131,084		298,367			236,453
Deduct: Loss and loss adjustment expense payments net of reinsurance:
Current year	20,577		13,908		32,754			17,606
Prior years	79,503		69,449		162,620			140,467
Total loss and loss adjustment expense payments	100,080		83,357		195,374			158,073
Reserve for losses and loss adjustment expenses net of reinsurance recoverables at end of period	1,092,818		839,508		1,092,818			839,508
Add: Reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period	375,535		221,553		375,535			221,553
Reserve for losses and loss adjustment expenses gross of reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period	$	1,468,353	$	1,061,061	$	1,468,353		$	1,061,061

The Company experienced $2.2 million of adverse reserve development in the three months ended June 30, 2018 on the reserve for losses and loss adjustment expenses held at December 31, 2017. This reserve development included $58,000 of favorable development in the Excess and Surplus Lines segment, primarily from $1.9 million of favorable development on the property catastrophe losses from the September 2017 storms coupled with adverse development in commercial auto business and favorable development in other core Excess and Surplus Lines. The Specialty Admitted Insurance segment experienced $167,000 of favorable development, primarily due to favorable development in the workers' compensation business for prior accident years, partially offset by adverse development on certain terminated program business. The Company also experienced $2.4 million of adverse development in the Casualty Reinsurance segment primarily related to losses from risk profiles and treaty structures that the Company no longer writes.

The Company experienced $1.7 million of adverse reserve development in the three months ended June 30, 2017 on the reserve for losses and loss adjustment expenses held at December 31, 2016. This reserve development included $1.4 million of favorable development in the Excess and Surplus Lines segment. The Specialty Admitted Insurance segment experienced $949,000 of adverse development, primarily due to adverse development in the programs business. The Company also experienced $2.2 million of adverse development for the Casualty Reinsurance segment. The development was mostly related to the 2010 and 2012 contracts with one reinsured.

The Company experienced $386,000 of favorable reserve development in the six months ended June 30, 2018 on the reserve for losses and loss adjustment expenses held at December 31, 2017. This reserve development included $1.2 million of favorable development in the Excess and Surplus Lines segment, primarily from $1.9 million of favorable development on the property catastrophe losses from the September 2017 storms coupled with adverse development in commercial auto business and favorable development in other core Excess and Surplus Lines. The Specialty Admitted Insurance segment experienced $1.5 million of favorable development, primarily due to favorable development in the workers' compensation business for prior accident years, partially offset by adverse development on certain terminated program business. The Company also experienced $2.3 million of adverse development in the Casualty Reinsurance segment primarily related to losses from risk profiles and treaty structures that the Company no longer writes.

19

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

The Company experienced $1.7 million of favorable reserve development in the six months ended June 30, 2017 on the reserve for losses and loss adjustment expenses held at December 31, 2016. This reserve development included $4.7 million of favorable development in the Excess and Surplus Lines segment. The Specialty Admitted Insurance segment experienced $907,000 of adverse development, primarily due to adverse development in the programs business which were partially offset by favorable development in the workers' compensation business. The Company also experienced $2.1 million of adverse development for the Casualty Reinsurance segment. The development was mostly related to the 2010 and 2012 contracts with one reinsured.

6.    Other Comprehensive (Loss) Income

The following table summarizes the components of other comprehensive (loss) income:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Unrealized (losses) gains arising during the period, before U.S. income taxes	$	(6,633	)	$	7,853		$	(25,925	)	$	13,851
U.S. income taxes	155			(1,156		)	699			(2,792		)
Unrealized (losses) gains arising during the period, net of U.S. income taxes	(6,478		)	6,697			(25,226		)	11,059
Less reclassification adjustment:
Net realized investment losses (gains)	108			(12		)	(93		)	438
U.S. income tax expenses	(28		)	1			(28		)	(121		)
Reclassification adjustment for investment losses (gains) realized in net income	80			(11		)	(121		)	317
Other comprehensive (loss) income	$	(6,558	)	$	6,708		$	(25,105	)	$	10,742

7.       Contingent Liabilities

The Company is a party to various lawsuits arising in the ordinary course of its operations. The Company believes that the ultimate resolution of these matters will not materially impact its financial position, cash flows, or results of operations.

The Company’s reinsurance subsidiary, JRG Re, has entered into three letter of credit facilities with banks as security to third-party reinsureds on reinsurance assumed by JRG Re. JRG Re has established custodial accounts to secure these letters of credit. Under a $100.0 million facility, $45.5 million of letters of credit were issued through June 30, 2018 which were secured by deposits of $59.0 million. Under a $102.5 million facility, $100.2 million of letters of credit were issued through June 30, 2018 which were secured by deposits of $126.3 million. Under a $100.0 million facility, $6.9 million of letters of credit were issued through June 30, 2018 which were secured by deposits of $10.0 million. JRG Re has also established trust accounts to secure its obligations to selected reinsureds. The total amount deposited in the trust accounts for the benefit of third-party reinsureds was $271.8 million at June 30, 2018.

The Company is also exposed to credit risk relating to a set of insurance contracts with an insured group of companies under which the Company pays losses and loss adjustment expenses on the contract. The Company has indemnity agreements with this group of insured parties (non-insurance entities) and is contractually entitled to receive reimbursement for a significant portion of the losses and loss adjustment expenses paid on behalf of the insured parties and other expenses incurred by the Company. The insured parties are required to collateralize all amounts currently due to the Company and to provide additional collateral sufficient to cover the amounts that may be recoverable under the indemnity agreement, including among other things case loss and loss adjustment expense reserves, IBNR loss and loss adjustment expense reserves, extra contractual obligations and excess of policy limits liabilities. This collateral is currently provided through a collateral trust arrangement established in favor of the Company by a captive insurance company affiliate of the insured group. At June 30, 2018, the cash equivalent collateral held in the collateral trust arrangement was approximately $944.8 million, which exceeds the amount of claims receivable and unpaid reported losses and loss adjustment expenses outstanding. This is a rapidly growing relationship, and as such, there is ongoing exposure to estimated losses and expenses on these contracts growing at a faster pace than growth in our collateral balances. In addition, we have credit exposure if our estimates of future losses and loss adjustment expenses and other amounts recoverable, which are the basis for establishing collateral balances, are lower than actual amounts paid or payable. The amount of our credit exposure in any of these instances could be material. To mitigate these risks, we closely and frequently monitor our exposure compared to our collateral held, and we request additional collateral when our analysis indicates that we have uncollateralized exposure.

20

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

8.    Segment Information

The Company has four reportable segments: the Excess and Surplus Lines segment, the Specialty Admitted Insurance segment, the Casualty Reinsurance segment, and the Corporate and Other segment. Segment profit (loss) is measured by underwriting profit (loss), which is generally defined as net earned premiums less loss and loss adjustment expenses and other operating expenses of the operating segments. Gross fee income of the Excess and Surplus Lines segment is included in that segment’s underwriting profit. Gross fee income of $3.7 million and $4.2 million was included in underwriting profit for the three months ended June 30, 2018 and 2017, respectively. For the six months ended June 30, 2018 and 2017, gross fee income of $8.5 million and $8.1 million, respectively, was included in underwriting profit. Segment results are reported prior to the effects of intercompany reinsurance agreements among the Company’s insurance subsidiaries.

21

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

The following table summarizes the Company’s segment results:

	Excess and Surplus Lines		Specialty Admitted Insurance		Casualty Reinsurance			Corporate and Other		Total
	(in thousands)
Three Months Ended June 30, 2018
Gross written premiums	$	165,398	$	97,100	$	30,880		$	—	$	293,378
Net earned premiums	139,127		14,266		54,817			—		208,210
Underwriting profit of insurance segments	10,117		988		1,729			—		12,834
Net investment income	4,350		839		9,662			1,284		16,135
Interest expense	—		—		—			2,946		2,946
Segment revenues	147,012		15,436		64,254			1,339		228,041
Segment goodwill	181,831		—		—			—		181,831
Segment assets	907,314		566,196		1,378,305			85,561		2,937,376
Three Months Ended June 30, 2017
Gross written premiums	$	138,004	$	76,771	$	66,700		$	—	$	281,475
Net earned premiums	117,268		17,760		49,049			—		184,077
Underwriting profit (loss) of insurance segments	11,729		553		(2,023		)	—		10,259
Net investment income	3,841		631		7,386			1,856		13,714
Interest expense	—		—		—			2,224		2,224
Segment revenues	125,484		18,435		56,574			1,901		202,394
Segment goodwill	181,831		—		—			—		181,831
Segment assets	779,428		369,515		1,268,560			114,550		2,532,053
Six Months Ended June 30, 2018
Gross written premiums	$	332,884	$	184,501	$	74,109		$	—	$	591,494
Net earned premiums	269,098		27,606		112,448			—		409,152
Underwriting profit of insurance segments	21,416		2,611		3,473			—		27,500
Net investment income	7,392		1,550		17,679			2,770		29,391
Interest expense	—		—		—			5,468		5,468
Segment revenues	284,339		29,391		129,780			2,875		446,385
Segment goodwill	181,831		—		—			—		181,831
Segment assets	907,314		566,196		1,378,305			85,561		2,937,376
Six Months Ended June 30, 2017
Gross written premiums	$	246,999	$	149,235	$	109,420		$	—	$	505,654
Net earned premiums	211,117		34,013		93,634			—		338,764
Underwriting profit (loss) of insurance segments	20,529		1,395		(930		)	—		20,994
Net investment income	7,024		1,267		14,510			7,646		30,447
Interest expense	—		—		—			4,347		4,347
Segment revenues	226,574		35,359		108,720			8,143		378,796
Segment goodwill	181,831		—		—			—		181,831
Segment assets	779,428		369,515		1,268,560			114,550		2,532,053

22

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

The following table reconciles the underwriting profit (loss) of the operating segments by individual segment to consolidated income before taxes:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Underwriting profit of the insurance segments:
Excess and Surplus Lines	$	10,117		$	11,729		$	21,416		$	20,529
Specialty Admitted Insurance	988			553			2,611			1,395
Casualty Reinsurance	1,729			(2,023		)	3,473			(930		)
Total underwriting profit of insurance segments	12,834			10,259			27,500			20,994
Other operating expenses of the Corporate and Other segment	(7,307		)	(6,095		)	(14,738		)	(12,556		)
Underwriting profit	5,527			4,164			12,762			8,438
Net investment income	16,135			13,714			29,391			30,447
Net realized investment (losses) gains	(64		)	307			(874		)	1,354
Amortization of intangible assets	(149		)	(149		)	(298		)	(298		)
Other income and expenses	4			(257		)	108			(57		)
Interest expense	(2,946		)	(2,224		)	(5,468		)	(4,347		)
Income before taxes	$	18,507		$	15,555		$	35,621		$	35,537

9.    Other Operating Expenses and Other Expenses

Other operating expenses consist of the following:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(in thousands)
Amortization of policy acquisition costs	$	28,672	$	31,614	$	58,870	$	59,252
Other underwriting expenses of the operating segments	15,772		15,327		32,926		30,121
Other operating expenses of the Corporate and Other segment	7,307		6,095		14,738		12,556
Total	$	51,751	$	53,036	$	106,534	$	101,929

10.    Fair Value Measurements

Three levels of inputs are used to measure fair value of financial instruments: (1) Level 1: quoted price (unadjusted) in active markets for identical assets, (2) Level 2: inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the instrument, and (3) Level 3: inputs to the valuation methodology are unobservable for the asset or liability.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date.

To measure fair value, the Company obtains quoted market prices for its investment securities from its outside investment managers. If a quoted market price is not available, the Company uses prices of similar securities. Values for U.S. Treasury and publicly-traded equity securities are generally based on Level 1 inputs which use the market approach valuation technique. The values for all other fixed maturity securities (including state and municipal securities and obligations of U.S. government corporations and agencies) generally incorporate significant Level 2 inputs, and in some cases, Level 3 inputs, using the market approach and income approach valuation techniques. There have been no changes in the Company’s use of valuation techniques since December 31, 2016.

The Company reviews fair value prices provided by its outside investment managers for reasonableness by comparing the fair values provided by the managers to those provided by its investment custodian. The Company also reviews and monitors changes in unrealized gains and losses. The Company has not historically adjusted security prices. The Company obtains an understanding of the methods, models and inputs used by the investment managers and independent pricing services, and controls

23

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

are in place to validate that prices provided represent fair values. The Company’s control process includes, but is not limited to, initial and ongoing evaluation of the methodologies used, a review of specific securities and an assessment for proper classification within the fair value hierarchy, and obtaining and reviewing internal control reports for our investment manager that obtains fair values from independent pricing services.

 Assets measured at fair value on a recurring basis as of June 30, 2018 are summarized below:

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	(in thousands)
Available-for-sale securities:
Fixed maturity securities:
State and municipal	$	—	$	138,373	$	—	$	138,373
Residential mortgage-backed	—		184,751		—		184,751
Corporate	—		430,345		—		430,345
Commercial mortgage and asset-backed	—		169,762		4,680		174,442
Obligations of U.S. government corporations and agencies	—		5,689		—		5,689
U.S. Treasury securities and obligations guaranteed by the U.S. government	85,227		570		—		85,797
Redeemable preferred stock	—		1,990		—		1,990
Total fixed maturity securities	85,227		931,480		4,680		1,021,387
Equity securities:
Preferred stock	—		64,866		—		64,866
Common stock	15,311		3,832		—		19,143
Total equity securities	15,311		68,698		—		84,009
Total available-for-sale securities	$	100,538	$	1,000,178	$	4,680	$	1,105,396
Trading securities:
Fixed maturity securities	$	—	$	—	$	—	$	—
Short-term investments	$	1,000	$	24,140	$	—	$	25,140

24

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

Assets measured at fair value on a recurring basis as of December 31, 2017 are summarized below:

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	(in thousands)
Available-for-sale securities:
Fixed maturity securities:
State and municipal	$	—	$	144,366	$	—	$	144,366
Residential mortgage-backed	—		158,661		—		158,661
Corporate	—		413,721		—		413,721
Commercial mortgage and asset-backed	—		177,931		4,680		182,611
Obligations of U.S. government corporations and agencies	—		35,847		—		35,847
U.S. Treasury securities and obligations guaranteed by the U.S. government	78,265		609		—		78,874
Redeemable preferred stock	—		2,018		—		2,018
Total fixed maturity securities	78,265		933,153		4,680		1,016,098
Equity securities:
Preferred stock	—		66,281		—		66,281
Common stock	15,507		734		—		16,241
Total equity securities	15,507		67,015		—		82,522
Total available-for-sale securities	$	93,772	$	1,000,168	$	4,680	$	1,098,620
Trading securities:
Fixed maturity securities	$	—	$	3,808	$	—	$	3,808
Short-term investments	$	1,000	$	35,804	$	—	$	36,804

The beginning and ending balances of assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of one available-for-sale fixed maturity security with a fair value of $4.7 million, and there was no activity (purchases, sales, transfers) involving Level 3 securities for the six months ended June 30, 2018 and 2017. A market approach using prices in trades of comparable securities was utilized to determine the fair value for this security at June 30, 2018 and December 31, 2017.

Transfers out of Level 3 occur when the Company is able to obtain reliable prices from pricing vendors for securities for which the Company was previously unable to obtain reliable prices. Transfers in to Level 3 occur when the Company is unable to obtain reliable prices for securities from pricing vendors and instead must use broker price quotes to value the securities.

There were no transfers between Level 1 and Level 2 during the six months ended June 30, 2018 or 2017. The Company recognizes transfers between levels at the beginning of the reporting period.

There were no realized gains or losses included in earnings for the six months ended June 30, 2018 attributable to the change in unrealized gains or losses relating to Level 3 assets valued at fair value on a recurring basis that are still held at June 30, 2018.

The Company measures certain bank loan participations at fair value on a non-recurring basis during the year as part of the Company’s impairment evaluation when loans are determined by management to be impaired.

25

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

Assets measured at fair value on a nonrecurring basis are summarized below:

	Fair Value Measurements Using
	Quoted Prices In Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	(in thousands)
June 30, 2018
Bank loan participations held-for-investment	$	—	$	—	$	2,243	$	2,243
December 31, 2017
Bank loan participations held-for-investment	$	—	$	—	$	5,111	$	5,111

Bank loan participations held-for-investment that were determined to be impaired were written down to their fair value of $2.2 million at June 30, 2018 and $5.1 million at December 31, 2017.

In the determination of the fair value for bank loan participations and certain high yield bonds, the Company’s investment manager endeavors to obtain data from multiple external pricing sources. External pricing sources may include brokers, dealers and price data vendors that provide a composite price based on prices from multiple dealers. Such external pricing sources typically provide valuations for normal institutional size trading units of such securities using methods based on market transactions for comparable securities, and various relationships between securities, as generally recognized by institutional dealers. For investments in which the investment manager determines that only one external pricing source is appropriate or if only one external price is available, the relevant investment is generally recorded at fair value based on such price.

Investments for which external sources are not available or are determined by the investment manager not to be representative of fair value are recorded at fair value as determined by the Company, with input from its investment managers and valuation specialists as considered necessary. In determining the fair value of such investments, the Company considers one or more of the following factors: type of security held, convertibility or exchangeability of the security, redeemability of the security (including the timing of redemptions), application of industry accepted valuation models, recent trading activity, liquidity, estimates of liquidation value, purchase cost, and prices received for securities with similar terms of the same issuer or similar issuers. At June 30, 2018, there were no investments for which external sources were unavailable to determine fair value. At December 31, 2017, there was one bank loan participation with an unpaid principal balance of $807,000 and a carrying value of zero for which external sources were unavailable to determine fair value.

The carrying values and fair values of financial instruments are summarized below:

	June 30, 2018				December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Assets
Available-for-sale:
Fixed maturity securities	$	1,021,387	$	1,021,387	$	1,016,098	$	1,016,098
Equity securities	84,009		84,009		82,522		82,522
Trading:
Fixed maturity securities	—		—		3,808		3,808
Bank loan participations held-for-investment	253,689		252,836		238,214		236,532
Cash and cash equivalents	267,367		267,367		163,495		163,495
Short-term investments	25,140		25,140		36,804		36,804
Other invested assets – notes receivable	13,250		18,880		11,778		17,104
Liabilities
Senior debt	98,300		97,960		98,300		97,884
Junior subordinated debt	104,055		115,472		104,055		116,569

26

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

The fair values of fixed maturity securities and equity securities have been determined using quoted market prices for securities traded in the public market or prices using bid or closing prices for securities not traded in the public marketplace. The fair values of cash and cash equivalents and short-term investments approximate their carrying values due to their short-term maturity.

The fair values of other invested assets-notes receivable, senior debt, and junior subordinated debt at June 30, 2018 and December 31, 2017 were determined by calculating the present value of expected future cash flows under the terms of the note agreements or debt agreements, as applicable, discounted at an estimated market rate of interest at June 30, 2018 and December 31, 2017, respectively.

The fair values of bank loan participations held-for-investment, senior debt, and junior subordinated debt at June 30, 2018 and December 31, 2017 were determined using inputs to the valuation methodology that are unobservable (Level 3).

11.    Capital Stock and Equity Awards

The Company issued 221,139 common shares in the six months ended June 30, 2018 with 177,835 new shares related to stock option exercises and 43,304 new shares related to vesting of RSUs. The total common shares outstanding increased from 29,696,682 at December 31, 2017 to 29,917,821 at June 30, 2018.

The Company declared the following dividends during the first six months of 2018 and 2017:

Date of Declaration	Dividend per Common Share		Payable to Shareholders of Record on	Payment Date	Total Amount
2018
February 22, 2018	$	0.30	March 12, 2018	March 30, 2018	$	9.0	million
May 1, 2018	$	0.30	June 11, 2018	June 29, 2018	$	9.1	million
	$	0.60			$	18.1	million
2017
February 14, 2017	$	0.30	March 13, 2017	March 31, 2017	$	8.9	million
May 2, 2017	$	0.30	June 12, 2017	June 30, 2017	$	8.9	million
	$	0.60			$	17.8	million

Included in the total dividends for the six months ended June 30, 2018 and 2017 are $197,000 and $154,000 of dividend equivalents on RSUs, respectively. The balance of dividends payable was $500,870 at June 30, 2018 and $434,000 at December 31, 2017.

Equity Incentive Plans

The Company’s shareholders have approved various equity incentive plans, including the Amended and Restated 2009 Equity Incentive Plan (the “Legacy Plan”), the 2014 Long Term Incentive Plan (“2014 LTIP”), and the 2014 Non-Employee Director Incentive Plan (“2014 Director Plan”) (collectively, the “Plans”). All awards issued under the Plans are issued at the discretion of the Board of Directors. Under the Legacy Plan, employees received non-qualified stock options. Options are outstanding under the Legacy Plan; however, no additional awards may be granted.

Employees are eligible to receive non-qualified stock options, incentive stock options, share appreciation rights, performance shares, restricted shares, RSUs, and other awards under the 2014 LTIP. The maximum number of shares available for issuance under the 2014 LTIP is 4,171,150, and at June 30, 2018, 1,692,615 shares are available for grant.

Non-employee directors of the Company are eligible to receive non-qualified stock options, share appreciation rights, performance shares, restricted shares, RSUs, and other awards under the 2014 Director Plan. The maximum number of shares available for issuance under the 2014 Director Plan is 50,000, and at June 30, 2018, 21,663 shares are available for grant.

Generally, awards issued under the 2014 LTIP and 2014 Director Plan vest immediately in the event that an award recipient is terminated without Cause (as defined in the applicable plans), and in the case of the 2014 LTIP for Good Reason (as defined in the applicable plans), at any time following a Change in Control (as defined in the applicable plans).

27

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

Options

The following table summarizes the option activity for the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Outstanding:
Beginning of period	1,479,236		$	27.81	2,234,699		$	22.84
Granted	—		$	—	205,244		$	42.24
Exercised	(255,609	)	$	21.14	(443,114	)	$	18.72
Forfeited	(29,446	)	$	36.26	(50,062	)	$	27.97
End of period	1,194,181		$	29.04	1,946,767		$	25.69
Exercisable, end of period	876,816		$	26.59	992,395		$	20.95

All of the outstanding options vest over two to four years and have a contractual life of seven years from the original date of grant. All of the outstanding options have an exercise price greater than or equal to the fair value of the underlying shares at the date of grant. The weighted-average remaining contractual life of the options outstanding and options exercisable was 4.1 years and 3.8 years, respectively.

RSUs

The following table summarizes the RSU activity for the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted- Average Grant Date Fair Value		Shares		Weighted- Average Grant Date Fair Value
Unvested, beginning of period	178,882		$	37.93	196,800		$	24.38
Granted	214,907		$	39.81	119,312		$	42.19
Vested	(63,191	)	$	40.92	(39,113	)	$	32.01
Forfeited	(4,454	)	$	41.04	(19,743	)	$	24.06
Unvested, end of period	326,144		$	38.55	257,256		$	31.50

The vesting period of RSUs granted to employees range from one to five years and vest ratably over the respective vesting period, and the majority vest in three years. All RSUs granted to date to non-employee directors had a one year vesting period. The holders of RSUs are entitled to dividend equivalents. The dividend equivalents are settled in cash at the same time that the underlying RSUs vest and are subject to the same risk of forfeiture as the underlying shares. The fair value of the RSUs granted is based on the market price of the underlying shares.

Compensation Expense

Share based compensation expense is recognized on a straight line basis over the vesting period. The amount of expense and related tax benefit is summarized below:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(in thousands)
Share based compensation expense	$	1,660	$	1,784	$	3,115	$	3,578
U.S. tax benefit on share based compensation expense	198		477		371		946

28

JAMES RIVER GROUP HOLDING, LTD. AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements (continued)

As of June 30, 2018, the Company had $11.9 million of unrecognized share based compensation expense expected to be charged to earnings over a weighted-average period of 2.1 years.

12.    Subsequent Events

On July 31, 2018, the Board of Directors declared a cash dividend of $0.30 per common share. The dividend is payable on September 28, 2018 to shareholders of record on September 10, 2018.

29

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of many factors. Factors that could cause such differences are discussed in the sections entitled “Special Note Regarding Forward-Looking Statements” in this Quarterly Report on Form 10-Q, or “Quarterly Report”, and Part I, Item 1A “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2017. The results of operations for the three and six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2018, or for any other future period. The following discussion should be read in conjunction with the unaudited condensed consolidated financial statements and the notes thereto included in Part I, Item 1 of this Quarterly Report, and in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2017.

The accompanying condensed consolidated financial statements and related notes have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) and include the accounts of James River Group Holdings, Ltd. and its subsidiaries. Unless the context indicates or suggests otherwise, references to “the Company”, “we”, “us” and “our” refer to James River Group Holdings, Ltd. and its subsidiaries.

Our Business

James River Group Holdings, Ltd. is a Bermuda-based holding company. We own and operate a group of specialty insurance and reinsurance companies with the objective of generating compelling returns on tangible equity while limiting underwriting and investment volatility. We seek to accomplish this by consistently earning profits from insurance and reinsurance underwriting and generating meaningful risk-adjusted investment returns while managing our capital opportunistically.

Our underwriting profit for the three and six months ended June 30, 2018 was $5.5 million and $12.8 million, respectively. In the prior year, for the same periods, we had an underwriting profit of $4.2 million and $8.4 million, respectively.

We are organized into four reportable segments, which are separately managed business units:

• The Excess and Surplus Lines segment offers commercial excess and surplus lines liability and property insurance in every U.S. state, the District of Columbia, Puerto Rico and the U.S. Virgin Islands through James River Insurance Company and its wholly-owned subsidiary, James River Casualty Company;

• The Specialty Admitted Insurance segment focuses on niche classes within the standard insurance markets, such as workers’ compensation coverage for residential contractors, light manufacturing operations, transportation workers and healthcare workers and fronting business, where we retain a small percentage of the risk and seek to earn fee income by allowing other carriers and producers to use our licensure, ratings and infrastructure. This segment has admitted licenses in 49 states and the District of Columbia;

• The Casualty Reinsurance segment primarily provides proportional and working layer casualty reinsurance to third parties (primarily through reinsurance intermediaries) and to our U.S.-based insurance subsidiaries (primarily through quota share reinsurance), through JRG Reinsurance Company Ltd. (“JRG Re”), a Bermuda-based reinsurance company. In addition, Carolina Re Ltd (“Carolina Re”) was formed in 2018 to provide reinsurance to the Company's U.S. based insurance subsidiaries; and

• The Corporate and Other segment consists of the management and treasury activities of our holding companies, interest expense associated with our debt, and expenses of our holding companies, including public company expenses, that are not reimbursed by our insurance segments.

All of our insurance and reinsurance subsidiaries have financial strength ratings of “A” (Excellent) from A.M. Best Company.

Critical Accounting Policies and Estimates

In preparing the unaudited condensed consolidated financial statements, we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities as of the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses for the reporting period. Actual results could differ significantly from those estimates.

The most critical accounting policies involve significant estimates and include those used in determining the reserve for losses and loss adjustment expenses, investment valuation and impairment, goodwill and intangible assets, and assumed reinsurance premiums. For a detailed discussion of each of these policies, refer to our Annual Report on Form 10-K for the year ended December 31, 2017. There have been no significant changes to any of these policies during the current year.

30

RESULTS OF OPERATIONS

The following table summarizes our results for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,						%		Six Months Ended June 30,						%
	2018			2017			Change		2018			2017			Change
	($ in thousands)
Gross written premiums	$	293,378		$	281,475		4.2	%	$	591,494		$	505,654		17.0	%
Net retention (1)	64.3		%	73.8		%			67.6		%	72.3		%
Net written premiums	$	188,606		$	207,824		(9.2	)%	$	399,584		$	365,734		9.3	%
Net earned premiums	$	208,210		$	184,077		13.1	%	$	409,152		$	338,764		20.8	%
Losses and loss adjustment expenses	(154,595		)	(131,084		)	17.9	%	(298,367		)	(236,453		)	26.2	%
Other operating expenses	(48,088		)	(48,829		)	(1.5	)%	(98,023		)	(93,873		)	4.4	%
Underwriting profit (2), (3)	5,527			4,164			32.7	%	12,762			8,438			51.2	%
Net investment income	16,135			13,714			17.7	%	29,391			30,447			(3.5	)%
Net realized and unrealized (losses) gains on investments	(64		)	307			‒		(874		)	1,354			‒
Other income and expense	4			(257		)	‒		108			(57		)	‒
Interest expense	(2,946		)	(2,224		)	32.5	%	(5,468		)	(4,347		)	25.8	%
Amortization of intangible assets	(149		)	(149		)	‒		(298		)	(298		)	‒
Income before taxes	18,507			15,555			19.0	%	35,621			35,537			0.2	%
Income tax expense	1,523			1,014			50.2	%	3,004			2,546			18.0	%
Net income	$	16,984		$	14,541		16.8	%	$	32,617		$	32,991		(1.1	)%
Adjusted net operating income (4)	$	17,569		$	14,864		18.2	%	$	34,138		$	32,583		4.8	%
Ratios:
Loss ratio	74.2		%	71.2		%			72.9		%	69.8		%
Expense ratio	23.1		%	26.5		%			24.0		%	27.7		%
Combined ratio	97.3		%	97.7		%			96.9		%	97.5		%

(1) Net retention is defined as the ratio of net written premiums to gross written premiums.

(2) Underwriting profit is a non-GAAP measure. See “Reconciliation of Non-GAAP Measures” for a reconciliation to income before tax and for additional information.

(3) Included in underwriting results for the three and six months ended June 30, 2018 is gross fee income of $7.4 million and $15.6 million, respectively ($6.9 million and $12.8 million for the same periods in the prior year).

(4) Adjusted net operating income is a non-GAAP measure. See “Reconciliation of Non-GAAP Measures” for reconciliation to net income and for additional information.

Three Months Ended June 30, 2018 and 2017

The Company had an underwriting profit of $5.5 million for the three months ended June 30, 2018. This compares to an underwriting profit of $4.2 million for the same period in the prior year.

The results for the three months ended June 30, 2018 and 2017 include certain non-operating items that are significant to the Company. These items (on a pre-tax basis) include: 

• Net realized and unrealized investment losses of $64,000 and net realized investment gains of $307,000 for the three months ended June 30, 2018 and 2017, respectively. See “— Investing Results" for more information on these realized investment losses and gains.

• Interest expense of $457,000 and $313,000 for the three months ended June 30, 2018 and 2017, respectively, relating to finance expenses in connection with a minority interest in a real estate partnership pursuant to which we are deemed an owner for accounting purposes. The debt is nonrecourse to us and was not arranged by us.

We define adjusted net operating income as net income excluding certain non-operating expenses such as net realized and unrealized gains and losses on investments, expenses related to due diligence costs for various merger and acquisition activities, professional service fees related to the filing of registration statements for the offering of securities, severance costs associated

31

with terminated employees, and interest and other income and expenses on a leased building that we are deemed to own for accounting purposes. We use adjusted net operating income as an internal performance measure in the management of our operations because we believe it gives our management and other users of our financial information useful insight into our results of operations and our underlying business performance. Adjusted net operating income should not be viewed as a substitute for net income calculated in accordance with GAAP, and our definition of adjusted net operating income may not be comparable to that of other companies.

Our income before taxes and net income for the three months ended June 30, 2018 and 2017 reconcile to our adjusted net operating income as follows:

	Three Months Ended June 30,
	2018				2017
	Income Before Taxes		Net Income		Income Before Taxes			Net Income
	($ in thousands)
Income as reported	$	18,507	$	16,984	$	15,555		$	14,541
Net realized and unrealized investment losses (gains)	64		98		(307		)	(248		)
Other expenses	93		126		346			368
Interest expense on leased building the Company is deemed to own for accounting purposes	457		361		313			203
Adjusted net operating income	$	19,121	$	17,569	$	15,907		$	14,864

Our combined ratio for the three months ended June 30, 2018 was 97.3%. The combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and other operating expenses to net earned premiums. A combined ratio of less than 100% indicates an underwriting profit, while a combined ratio greater than 100% reflects an underwriting loss. The combined ratio for the three months ended June 30, 2018 includes $2.2 million, or 1.1 percentage points, of net adverse reserve development on prior accident years, including $58,000 of net favorable reserve development from the Excess and Surplus Lines segment, $167,000 of net favorable reserve development from the Specialty Admitted Insurance segment, and $2.4 million of net adverse reserve development from the Casualty Reinsurance segment.

The combined ratio for the three months ended June 30, 2017 was 97.7%. The combined ratio included $1.7 million, or 0.9 percentage points, of net adverse reserve development on prior accident years, including $1.4 million of net favorable reserve development from the Excess and Surplus Lines segment, $949,000 of net adverse reserve development from the Specialty Admitted Insurance segment, and $2.2 million of net adverse reserve development from the Casualty Reinsurance segment.

Our expense ratio improved from 26.5% for the three months ended June 30, 2017 to 23.1% for the three months ended June 30, 2018. The improvement is due to a 18.6% increase in the net earned premiums of the Excess and Surplus Lines segment and an increase in gross fee income for the Company as a whole. Our Excess and Surplus Lines segment has significant scale and produces a lower expense ratio than our other operating segments. The Excess and Surplus Lines segment is our largest segment and makes up 66.8% of consolidated net earned premiums for the three months ended June 30, 2018. Gross fee income for the Company increased from $6.9 million for the three months ended June 30, 2017 to $7.4 million for the three months ended June 30, 2018.

Six Months Ended June 30, 2018 and 2017

The Company had an underwriting profit of $12.8 million for the six months ended June 30, 2018. This compares to an underwriting profit of $8.4 million for the same period in the prior year.

The results for the six months ended June 30, 2018 and 2017 include certain non-operating items that are significant to the Company. These items (on a pre-tax basis) include: 

• Net realized and unrealized investment losses of $874,000 and net realized investment gains of $1.4 million for the six months ended June 30, 2018 and 2017, respectively. See “— Investing Results" for more information on these realized investment losses and gains.

• Interest expense of $775,000 and $625,000 for the six months ended June 30, 2018 and 2017, respectively, relating to finance expenses in connection with a minority interest in a real estate partnership pursuant to which we are deemed an owner for accounting purposes. The debt is nonrecourse to us and was not arranged by us.

32

Our income before taxes and net income for the six months ended June 30, 2018 and 2017 reconcile to our adjusted net operating income as follows:

	Six Months Ended June 30,
	2018				2017
	Income Before Taxes		Net Income		Income Before Taxes			Net Income
	($ in thousands)
Income as reported	$	35,621	$	32,617	$	35,537		$	32,991
Net realized and unrealized investment losses (gains)	874		763		(1,354		)	(1,082		)
Other expenses	97		146		232			268
Interest expense on leased building the Company is deemed to own for accounting purposes	775		612		625			406
Adjusted net operating income	$	37,367	$	34,138	$	35,040		$	32,583

Our combined ratio for the six months ended June 30, 2018 was 96.9%. The combined ratio for the six months ended June 30, 2018 includes $386,000, or 0.1 percentage points, of net favorable reserve development on prior accident years, including $1.2 million of net favorable reserve development from the Excess and Surplus Lines segment, $1.5 million of net favorable reserve development from the Specialty Admitted Insurance segment, and $2.3 million of net adverse reserve development from the Casualty Reinsurance segment.

The combined ratio for the six months ended June 30, 2017 was 97.5%. The combined ratio included $1.7 million, or 0.5 percentage points, of net favorable reserve development on prior accident years, including $4.7 million of net favorable reserve development from the Excess and Surplus Lines segment, $907,000 of net adverse reserve development from the Specialty Admitted Insurance segment, and $2.1 million of net adverse reserve development from the Casualty Reinsurance segment.

Our expense ratio improved from 27.7% for the six months ended June 30, 2017 to 24.0% for the six months ended June 30, 2018. The improvement is due to a 27.5% increase in the net earned premiums of the Excess and Surplus Lines segment and an increase in gross fee income for the Company as a whole. Our Excess and Surplus Lines segment has significant scale and produces a lower expense ratio than our other operating segments. The Excess and Surplus Lines segment is our largest segment and makes up 65.8% of consolidated net earned premiums for the six months ended June 30, 2018. Gross fee income for the Company increased from $12.8 million for the six months ended June 30, 2017 to $15.6 million for the six months ended June 30, 2018.

All of the Company’s U.S.-domiciled insurance subsidiaries are party to an intercompany pooling agreement that distributes the net underwriting results among the group companies based on their approximate pro-rata level of statutory capital and surplus to the total Company statutory capital and surplus. Additionally, each of the Company’s U.S.-domiciled insurance subsidiaries is a party to a quota share reinsurance agreement that in prior periods ceded 70% of their premiums and losses to JRG Re, and starting January 1, 2018, ceded 70% of their premiums and losses to Carolina Re, an Internal Revenue Code of 1986, as amended (the “Code”), Section 953(d) U.S. tax paying entity domiciled in Bermuda. JRG Re also provides stop loss reinsurance to Carolina Re. We report all segment information in this ‘‘Management’s Discussion and Analysis of Financial Condition and Results of Operations’’ prior to the effects of intercompany reinsurance, consistent with the manner in which we evaluate the operating performance of our reportable segments.

33

Premiums

Insurance premiums are earned ratably over the terms of our insurance policies, generally twelve months. Reinsurance premiums assumed are earned over the terms of the underlying policies or reinsurance contracts. Contracts and policies written on a “losses occurring” basis cover claims that may occur during the term of the contract or policy, which is typically twelve months. Contracts which are written on a “risks attaching” basis cover claims which attach to the underlying insurance policies written during the terms of such contracts. Premiums earned on such contracts usually extend beyond the original term of the reinsurance contract, typically resulting in recognition of premiums earned over a 24-month period in proportion to the level of underlying exposure.

The following table summarizes the change in premium volume by component and business segment:

	Three Months Ended June 30,				%		Six Months Ended June 30,				%
	2018		2017		Change		2018		2017		Change
	($ in thousands)
Gross written premiums:
Excess and Surplus Lines	$	165,398	$	138,004	19.9	%	$	332,884	$	246,999	34.8	%
Specialty Admitted Insurance	97,100		76,771		26.5	%	184,501		149,235		23.6	%
Casualty Reinsurance	30,880		66,700		(53.7	)%	74,109		109,420		(32.3	)%
	$	293,378	$	281,475	4.2	%	$	591,494	$	505,654	17.0	%
Net written premiums:
Excess and Surplus Lines	$	143,235	$	124,197	15.3	%	$	297,166	$	221,168	34.4	%
Specialty Admitted Insurance	14,487		16,900		(14.3	)%	28,305		34,959		(19.0	)%
Casualty Reinsurance	30,884		66,727		(53.7	)%	74,113		109,607		(32.4	)%
	$	188,606	$	207,824	(9.2	)%	$	399,584	$	365,734	9.3	%
Net earned premiums:
Excess and Surplus Lines	$	139,127	$	117,268	18.6	%	$	269,098	$	211,117	27.5	%
Specialty Admitted Insurance	14,266		17,760		(19.7	)%	27,606		34,013		(18.8	)%
Casualty Reinsurance	54,817		49,049		11.8	%	112,448		93,634		20.1	%
	$	208,210	$	184,077	13.1	%	$	409,152	$	338,764	20.8	%

Gross written premiums for the Excess and Surplus Lines segment (which represents 56.3% of our consolidated gross written premiums in the first six months of 2018) increased 19.9% and 34.8% over the corresponding three and six month periods in the prior year. Excluding commercial auto policies, gross written premiums increased 15.3% and 24.6% over the corresponding three and six month periods in the prior year. Policy submissions excluding commercial auto policies were 9.0% higher and 9.5% more policies were bound in the six months ended June 30, 2018 than in the six months ended June 30, 2017. Rates for the Excess and Surplus Lines segment were up compared to the six months ended June 30, 2017. The change in gross written premiums compared to the same period in 2017 was most notable in our Commercial Auto, Manufacturers and Contractors, General Casualty, Excess Casualty, Allied Health, and Energy divisions as shown below:

	Three Months Ended June 30,				%		Six Months Ended June 30,				%
	2018		2017		Change		2018		2017		Change
	($ in thousands)
Commercial Auto	$	81,127	$	64,915	25.0	%	$	158,339	$	106,965	48.0	%
Manufacturers & Contractors	22,034		22,896		(3.8	)%	39,634		44,955		(11.8	)%
General Casualty	16,726		10,435		60.3	%	31,278		19,000		64.6	%
Excess Casualty	14,870		10,406		42.9	%	24,666		19,920		23.8	%
Allied Health	2,421		4,319		(43.9	)%	23,543		11,177		110.6	%
Energy	6,607		7,017		(5.8	)%	18,127		12,872		40.8	%
All other divisions	21,613		18,016		20.0	%	37,297		32,110		16.2	%
Excess and Surplus Lines gross written premium	$	165,398	$	138,004	19.9	%	$	332,884	$	246,999	34.8	%

34

The Commercial Auto division is focused on underwriting the hired and non-owned auto liability exposures for a variety of industry segments with a particular niche for insuring organizations that operate networks connecting independent contractors with customers.

The components of gross written premiums for the Specialty Admitted Insurance segment (which represents 31.2% of our consolidated gross written premiums for the six months ended June 30, 2018) are as follows:

	Three Months Ended June 30,				%		Six Months Ended June 30,				%
	2018		2017		Change		2018		2017		Change
	($ in thousands)
Individual risk workers’ compensation premium	$	12,808	$	9,774	31.0	%	$	25,395	$	21,573	17.7	%
Fronting and program premium	84,292		66,997		25.8	%	159,106		127,662		24.6	%
Specialty Admitted gross written premium	$	97,100	$	76,771	26.5	%	$	184,501	$	149,235	23.6	%

Individual risk workers’ compensation premium growth was driven by exposure growth from higher payrolls of our insureds in a strong economy and increased submission flow.

The premium growth in our fronting and program business was driven by growth in the gross written premium from our largest agency relationship, which produced $106.7 million of gross written premium for the six months ended June 30, 2018, up from $76.7 million for the six months ended June 30, 2017.

A significant portion of the fronting business is ceded to third party reinsurers. As a result, our fronting net written premium for this segment increased by less than our gross written premiums, increasing 2.7% and 4.9% for the three and six months ended June 30, 2018, respectively.

Gross written premiums for the Casualty Reinsurance segment (which represents 12.5% of our consolidated gross written premiums in the first six months of 2018) decreased 53.7% and 32.3% from the corresponding three and six month periods in the prior year. The reduction in gross written premium in this segment was in line with our expectations and consistent with our planned reductions for the Casualty Reinsurance segment as we redeploy our capital to where we believe we can make the highest operating returns on tangible equity. The Casualty Reinsurance segment generally writes large casualty-focused treaties that are expected to have lower volatility relative to property and catastrophe treaties. We rarely write stand-alone property reinsurance. When treaties that include property exposure are written, we utilize property occurrence caps, inuring reinsurance protection and low individual risk limits to minimize exposure.

Net Retention

The ratio of net written premiums to gross written premiums is referred to as our net premium retention. Our net premium retention is summarized by segment as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Excess and Surplus Lines	86.6	%	90.0	%	89.3	%	89.5	%
Specialty Admitted Insurance	14.9	%	22.0	%	15.3	%	23.4	%
Casualty Reinsurance	100.0	%	100.0	%	100.0	%	100.2	%
Total	64.3	%	73.8	%	67.6	%	72.3	%

The net premium retention for the Specialty Admitted Insurance segment decreased from 2017 to 2018 as a result of growth in the segment's fronting business, which generally has much lower net premium retention than our workers’ compensation business. Fronting gross written premium grew 25.8% and 24.6% for the three and six months ended June 30, 2018 compared to the corresponding period in the prior year. For the three and six months ended June 30, 2018, the net retention on the segment’s fronting business was 9.9% and 10.2%, respectively (12.1% in both the three and six months ended June 30, 2017, respectively), while the net retention on the workers’ compensation business was 48.0% and 47.4%, respectively (89.9% and 90.2% in the three and six months ended June 30, 2017, respectively). The significant decline in the net retention from the prior year on the workers' compensation business is due to the 50% third-party quota share reinsurance coverage purchased in this business effective October 1, 2017.

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Underwriting Results

The following table compares our combined ratios by segment:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Excess and Surplus Lines	92.7	%	90.0	%	92.0	%	90.3	%
Specialty Admitted Insurance	93.1	%	96.9	%	90.5	%	95.9	%
Casualty Reinsurance	96.8	%	104.1	%	96.9	%	101.0	%
Total	97.3	%	97.7	%	96.9	%	97.5	%

Excess and Surplus Lines Segment

Results for the Excess and Surplus Lines segment are as follows:

	Three Months Ended June 30,						%		Six Months Ended June 30,						%
	2018			2017			Change		2018			2017			Change
	($ in thousands)
Gross written premiums	$	165,398		$	138,004		19.9	%	$	332,884		$	246,999		34.8	%
Net written premiums	$	143,235		$	124,197		15.3	%	$	297,166		$	221,168		34.4	%
Net earned premiums	$	139,127		$	117,268		18.6	%	$	269,098		$	211,117		27.5	%
Losses and loss adjustment expenses	(109,607		)	(86,521		)	26.7	%	(210,226		)	(153,089		)	37.3	%
Underwriting expenses	(19,403		)	(19,018		)	2.0	%	(37,456		)	(37,499		)	(0.1	)%
Underwriting profit (1), (2)	$	10,117		$	11,729		(13.7	)%	$	21,416		$	20,529		4.3	%
Ratios:
Loss ratio	78.8		%	73.8		%			78.1		%	72.5		%
Expense ratio	13.9		%	16.2		%			13.9		%	17.8		%
Combined ratio	92.7		%	90.0		%			92.0		%	90.3		%

(1) Underwriting Profit is a non-GAAP Measure. See “Reconciliation of Non-GAAP Measures” for a reconciliation to income before tax and for additional information.

(2) Underwriting results include gross fee income of $3.7 million and $8.5 million for the three and six months ended June 30, 2018, respectively ($4.2 million and $8.1 million for the same periods in the prior year).

The loss ratio of 78.8% and 78.1% for the three and six months endedJune 30, 2018 includes $58,000 and $1.2 million (0.0 and 0.4 percentage points), respectively, of net favorable development in our loss estimates for prior accident years. The loss ratio of 73.8% and 72.5% for the three and six months endedJune 30, 2017 includes $1.4 million and $4.7 million (1.2 and 2.2 percentage points), respectively, in net favorable reserve development in our loss estimates for prior accident years.

The expense ratio for this segment declined from 16.2% and 17.8% for the three and six months endedJune 30, 2017 to 13.9% for both the three and six months endedJune 30, 2018. The decrease in the expense ratio is attributable to the increase in net earned premium of 18.6% and 27.5% for the three and six months endedJune 30, 2018, respectively, without a proportional increase in the total amount of operating expenses. Gross fee income contributed to a reduction in the expense ratio of 2.6 and 3.2 percentage points for the three and six months endedJune 30, 2018, respectively (3.6 and 3.8 percentage points for the same periods in the prior year).

The reduced expense ratio and higher loss ratio in this segment is due to the increase in commercial auto premium as a percentage of the Excess and Surplus Lines segment’s total premium. Our commercial auto business has a lower expense ratio and higher loss ratio than the other underwriting divisions in the segment. Commercial auto made up 57.3% and 57.0% of the segment’s net earned premiums for the three and six months endedJune 30, 2018, respectively (53.6% and 50.2% for the same periods in the prior year).

As a result of the items discussed above, the underwriting profit of the Excess and Surplus Lines segment decreased 13.7% and increased 4.3% from $11.7 million and $20.5 million for the three and six months endedJune 30, 2017, respectively, to $10.1 million and $21.4 million for the three and six months endedJune 30, 2018.

36

Specialty Admitted Insurance Segment

Results for the Specialty Admitted Insurance segment are as follows:

	Three Months Ended June 30,						%		Six Months Ended June 30,						%
	2018			2017			Change		2018			2017			Change
	($ in thousands)
Gross written premiums	$	97,100		$	76,771		26.5	%	$	184,501		$	149,235		23.6	%
Net written premiums	$	14,487		$	16,900		(14.3	)%	$	28,305		$	34,959		(19.0	)%
Net earned premiums	$	14,266		$	17,760		(19.7	)%	$	27,606		$	34,013		(18.8	)%
Losses and loss adjustment expenses	(9,426		)	(11,867		)	(20.6	)%	(17,037		)	(21,848		)	(22.0	)%
Underwriting expenses	(3,852		)	(5,340		)	(27.9	)%	(7,958		)	(10,770		)	(26.1	)%
Underwriting profit(1), (2)	$	988		$	553		78.7	%	$	2,611		$	1,395		87.2	%
Ratios:
Loss ratio	66.1		%	66.8		%			61.7		%	64.2		%
Expense ratio	27.0		%	30.1		%			28.8		%	31.7		%
Combined ratio	93.1		%	96.9		%			90.5		%	95.9		%

(1) Underwriting Profit is a non-GAAP Measure. See “Reconciliation of Non-GAAP Measures” for a reconciliation to income before tax and for additional information.

(2) Underwriting results include gross fee income of $3.7 million and $7.1 million for the three and six months ended June 30, 2018, respectively ($2.7 million and $4.7 million for the same periods in the prior year).

The loss ratio of 66.1% and 61.7% for the three and six months endedJune 30, 2018 includes $167,000 and $1.5 million (1.2 and 5.4 percentage points), respectively, of net favorable development in our loss estimates for prior accident years. The favorable reserve development in 2018 reflects the fact that actual loss emergence of the workers’ compensation book has been better than expected. The loss ratio of 66.8% and 64.2% for the three and six months endedJune 30, 2017 includes $949,000 and $907,000 (5.3 and 2.7 percentage points), respectively, in net adverse reserve development in our loss estimates for prior accident years.

The expense ratio of the Specialty Admitted Insurance segment was 27.0% and 28.8% for the three and six months endedJune 30, 2018 compared to the prior year ratios of 30.1% and 31.7%, respectively. The expense ratio declined in 2018 for this segment due to gross fee income from the fronting business which increased 39.7% and 49.5% for the three and six months endedJune 30, 2018 compared to the same periods in the prior year and to ceding commissions received on the 50% third-party quota share reinsurance coverage purchased on individual risk workers' compensation business effective October 1, 2017.

As a result of the items discussed above, the underwriting profit of the Specialty Admitted Insurance segment increased 78.7% and 87.2% from $553,000 and $1.4 million for the three and six months endedJune 30, 2017, respectively, to $988,000 and $2.6 million for the three and six months endedJune 30, 2018.

Casualty Reinsurance Segment

Results for the Casualty Reinsurance segment are as follows:

	Three Months Ended June 30,						%		Six Months Ended June 30,						%
	2018			2017			Change		2018			2017			Change
	($ in thousands)
Gross written premiums	$	30,880		$	66,700		(53.7	)%	$	74,109		$	109,420		(32.3	)%
Net written premiums	$	30,884		$	66,727		(53.7	)%	$	74,113		$	109,607		(32.4	)%
Net earned premiums	$	54,817		$	49,049		11.8	%	$	112,448		$	93,634		20.1	%
Losses and loss adjustment expenses	(35,562		)	(32,696		)	8.8	%	(71,104		)	(61,516		)	15.6	%
Underwriting expenses	(17,526		)	(18,376		)	(4.6	)%	(37,871		)	(33,048		)	14.6	%
Underwriting profit (1)	$	1,729		$	(2,023	)	‒		$	3,473		$	(930	)	‒
Ratios:
Loss ratio	64.9		%	66.7		%			63.2		%	65.7		%
Expense ratio	31.9		%	37.4		%			33.7		%	35.3		%
Combined ratio	96.8		%	104.1		%			96.9		%	101.0		%

37

(1) Underwriting Profit is a non-GAAP Measure. See “Reconciliation of Non-GAAP Measures” for a reconciliation to income before tax and for additional information.

The Casualty Reinsurance segment focuses on lower volatility, proportional reinsurance which requires larger ceding commissions resulting in a higher commission expense than in our other segments.

The loss ratio of 64.9% and 63.2% for the three and six months endedJune 30, 2018 includes $2.4 million and $2.3 million (4.5 and 2.0 percentage points), respectively, of net adverse development in our loss estimates for prior accident years. The adverse reserve development was primarily related to losses from risk profiles and treaty structures that we no longer underwrite. The loss ratio of 66.7% and 65.7% for the three and six months endedJune 30, 2017 includes $2.2 million and $2.1 million (4.5 and 2.2 percentage points), respectively, in net adverse reserve development in our loss estimates for prior accident years, primarily resulting from the 2010 and 2012 contracts with one reinsured.

The expense ratio of the Casualty Reinsurance segment was 31.9% and 33.7% for the three and six months endedJune 30, 2018, respectively, compared to the prior year ratios of 37.4% and 35.3%, respectively. The decrease in the expense ratio is attributable to the increase in net earned premium of 11.8% and 20.1% for the three and six months endedJune 30, 2018, respectively, without a proportional increase in the total amount of operating expenses. In addition, the expense ratio for the three and six months endedJune 30, 2017 was impacted by the correction of a contingent commission accrual and related commission expense, which increased underwriting expenses by $2.0 million in the three and six months endedJune 30, 2017.

As a result of the items discussed above, underwriting profit for the Casualty Reinsurance segment was $1.7 million and $3.5 million for the three and six months endedJune 30, 2018, respectively, compared to underwriting losses of $2.0 million and $930,000 for the three and six months endedJune 30, 2017, respectively.

Reserves

An indicator of reserve strength that we monitor closely is the percentage of our gross and net loss reserves that are comprised of incurred but not reported (“IBNR”) reserves.

The Company’s gross reserve for losses and loss adjustment expenses at June 30, 2018 was $1,468.4 million. Of this amount, 63.2% relates to amounts that are IBNR. This amount was 64.6% at December 31, 2017. The Company’s gross reserves for losses and loss adjustment expenses by segment are summarized as follows:

	Gross Reserves at June 30, 2018
	Case		IBNR		Total
	($ in thousands)
Excess and Surplus Lines	$	284,951	$	571,193	$	856,144
Specialty Admitted Insurance	147,371		195,623		342,994
Casualty Reinsurance	107,746		161,469		269,215
Total	$	540,068	$	928,285	$	1,468,353

At June 30, 2018, the amount of net reserves of $1,092.8 million that related to IBNR was 63.5%. This amount was 65.0% at December 31, 2017. The Company’s net reserves for losses and loss adjustment expenses by segment are summarized as follows:

	Net Reserves at June 30, 2018
	Case		IBNR		Total
	($ in thousands)
Excess and Surplus Lines	$	259,789	$	485,287	$	745,076
Specialty Admitted Insurance	35,541		49,000		84,541
Casualty Reinsurance	103,542		159,659		263,201
Total	$	398,872	$	693,946	$	1,092,818

Other Operating Expenses

In addition to the underwriting, acquisition, and insurance expenses of the Excess and Surplus Lines segment, the Specialty Admitted Insurance segment, and the Casualty Reinsurance segment discussed previously, other operating expenses also includes the expenses of the Corporate and Other segment.

Corporate and Other Segment

Other operating expenses for the Corporate and Other segment include personnel costs associated with the Bermuda and U.S. holding companies, professional fees, and various other corporate expenses that are included in our calculation of our expense ratio and our combined ratio. Other operating expenses of the Corporate and Other segment represent the expenses of both the

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Bermuda and U.S. holding companies that were not reimbursed by our subsidiaries, including costs associated with our internal quota share, rating agencies and strategic initiatives. These costs vary from period-to-period based on the status of these initiatives.

For the three months ended June 30,2018 and 2017, the total operating expenses of the Corporate and Other segment were $7.3 million and $6.1 million, respectively, representing a 19.9% increase over the prior year. For the six months ended June 30, 2018 and 2017, the total operating expenses of the Corporate and Other segment were $14.7 million and $12.6 million, respectively, representing a 17.4% increase over the prior year. The increases were driven by compensation costs, including stock compensation expenses, associated with increases in headcount and costs associated with the formation and operations of Carolina Re (a new Class 3A reinsurer that has made an irrevocable election to be taxed as a U.S. domestic corporation under Section 953(d) of the Code. See “Income Tax Expense” for additional discussions regarding this newly formed 953(d) reinsurer).

Investing Results

Net investment income was $16.1 million and $29.4 million for the three and six months endedJune 30, 2018, respectively, compared to $13.7 million and $30.4 million for the same periods in the prior year. The change in our net investment income is as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018		2017		% Change		2018		2017		% Change
	($ in thousands)
Renewable energy LLCs	$	530	$	1,521	(65.2	)%	$	1,741	$	7,115	(75.5	)%
Other private investments	1,506		838		79.7	%	2,116		1,306		62.0	%
Other invested assets	2,036		2,359		(13.7	)%	3,857		8,421		(54.2	)%
All other net investment income	14,099		11,355		24.2	%	25,534		22,026		15.9	%
Total net investment income	$	16,135	$	13,714	17.7	%	$	29,391	$	30,447	(3.5	)%

Net investment income from renewable energy LLCs declined from $1.5 million and $7.1 million in three and six months endedJune 30, 2017, respectively, to $530,000 and $1.7 million in the three and six months endedJune 30, 2018, respectively. These investments are interests in certain limited liability companies that are managed by an affiliate of the Company, and together, the carrying value of these investments was $32.2 million at June 30, 2018. Our interests in these companies are classified as “other invested assets” and the equity method is being used to account for the investments. Excluding private investments, our net investment income increased by 24.2% and 15.9% for the three and six months ending June 30, 2018, respectively, over the same periods in the prior year. This increase in net investment income was due to a 13.8% and 13.4% increase in our average cash and invested assets for the three and six months endedJune 30, 2018 compared to the same periods in the prior year, as well as increases in average investment yields. The average duration of our fixed maturity portfolio was 3.4 years at June 30, 2018.

Major categories of the Company’s net investment income are summarized as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	($ in thousands)
Fixed maturity securities	$	7,733		$	6,420		$	15,101		$	13,190
Bank loan participations	5,435			4,639			8,552			8,251
Equity securities	1,346			1,229			2,674			2,457
Other invested assets	2,036			2,359			3,857			8,421
Cash, cash equivalents, short-term investments, and other	640			56			1,232			118
Trading (losses) gains	(1		)	(2		)	(4		)	1
Gross investment income	17,189			14,701			31,412			32,438
Investment expense	(1,054		)	(987		)	(2,021		)	(1,991		)
Net investment income	$	16,135		$	13,714		$	29,391		$	30,447

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The following table summarizes our investment returns:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Annualized gross investment yield on:
Average cash and invested assets	4.1	%	4.0	%	3.8	%	4.4	%
Average fixed maturity securities	4.0	%	3.6	%	3.7	%	3.5	%

Of our total cash and invested assets of $1,728.4 million at June 30, 2018, $267.4 million represents the cash and cash equivalents portion of the portfolio. The majority of the portfolio, or $1,021.4 million, is comprised of fixed maturity securities that are classified as available-for-sale and carried at fair value with unrealized gains and losses on these securities reported, net of applicable taxes, as a separate component of accumulated comprehensive income or loss. Also included in our investments are $253.7 million of bank loan participations, $84.0 million of equity securities, $25.1 million of short-term investments, and $76.8 million of other invested assets.

The $253.7 million of bank loan participations in our investment portfolio are classified as held-for-investment and reported at amortized cost, net of an allowance for credit losses of $1.2 million. Changes in this credit allowance are included in realized gains or losses. These bank loan participations are primarily senior, secured floating-rate debt rated “BB”, “B”, or “CCC” by Standard & Poor’s or an equivalent rating from another nationally recognized statistical rating organization, and are therefore below investment grade. Bank loans include assignments of and participations in, performing and non-performing senior corporate debt generally acquired through primary bank syndications and in secondary markets. They consist of, but are not limited to, term loans, the funded and unfunded portions of revolving credit loans, and similar loans and investments. At June 30, 2018 and December 31, 2017, the fair market value of these securities was $252.8 million and $236.5 million, respectively.

For the six months ended June 30, 2018, the Company recognized net realized and unrealized investment losses of $874,000 ($64,000 for the three months ended June 30, 2018), including $1.2 million for the change in the fair value of equity securities, $1.4 million of net realized investment gains on the sale of bank loan securities (including an $807,000 realized gain on the repayment of the loan to the producer and supplier of power in Puerto Rico described below), and $893,000 of net realized investment losses from an increase in our bank loan credit allowance.

For the six months ended June 30, 2017, the Company recognized net realized investment gains of $1.4 million ($307,000 for the three months ended June 30, 2017), including $783,000 of net realized investment gains recognized on the sale of bank loan securities, $409,000 of net realized investment gains recognized on the sale of equity securities, and $135,000 of net realized investment gains from a reduction in our bank loan credit allowance.

In conjunction with its outside investment managers, the Company performs quarterly reviews of all securities within its investment portfolio to determine whether any impairment has occurred.

At December 31, 2017, the Company held a participation in a loan with unpaid principal of $807,000 issued by a company that produces and supplies power to Puerto Rico through a power purchase agreement with Puerto Rico Electric Power Authority (“PREPA”), a public corporation and governmental agency of the Commonwealth of Puerto Rico. PREPA’s credit strength and ability to make timely payments had been impacted by the economic conditions in Puerto Rico. The loan was scheduled to mature in November 2017, but the issuer deferred payment until March 2018. Based on this deferral request and the uncertainty regarding repayment, management had concluded that an allowance for credit losses should be established on the loan to reduce its carrying value to $0 at December 31, 2017. In the first quarter of 2018, the remaining principal balance on the loan was repaid, and the Company recognized an $807,000 realized investment gain associated with the repayment.

Management concluded that certain loans in the Company's bank loan portfolio were impaired as of June 30, 2018. The aggregate allowance for credit losses was $1.2 million at June 30, 2018 on impaired loans from three issuers with a total carrying value of $2.2 million and unpaid principal of $3.5 million.

At June 30, 2018, 100.0% of the Company’s fixed maturity security portfolio was rated “BBB-” or better (“investment grade”) by Standard & Poor’s or received an equivalent rating from another nationally recognized rating agency.

Management concluded that none of the fixed maturity securities with an unrealized loss at June 30, 2018 experienced an other-than-temporary impairment. Management does not intend to sell available-for-sale securities in an unrealized loss position, and it is not “more likely than not” that the Company will be required to sell these securities before a recovery in their value to their amortized cost basis occurs.

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The amortized cost and fair value of our investments in available-for-sale securities were as follows:

	June 30, 2018						December 31, 2017
	Cost or Amortized Cost		Fair Value		% of Total Fair Value		Cost or Amortized Cost		Fair Value		% of Total Fair Value
	($ in thousands)
Fixed maturity securities:
State and municipal	$	137,055	$	138,373	12.5	%	$	139,382	$	144,366	13.1	%
Residential mortgage-backed	190,574		184,751		16.7	%	160,379		158,661		14.4	%
Corporate	439,993		430,345		38.9	%	408,857		413,721		37.7	%
Commercial mortgage and asset-backed	177,286		174,442		15.8	%	182,595		182,611		16.6	%
Obligations of U.S. government corporations and agencies	5,702		5,689		0.5	%	35,948		35,847		3.3	%
U.S. Treasury securities and obligations guaranteed by the U.S. government	87,143		85,797		7.8	%	79,476		78,874		7.2	%
Redeemable preferred stock	2,025		1,990		0.2	%	2,025		2,018		0.2	%
Total	1,039,778		1,021,387		92.4	%	1,008,662		1,016,098		92.5	%
Equity securities:
Preferred stock	58,818		64,866		5.9	%	59,102		66,281		6.0	%
Common stock	19,177		19,143		1.7	%	16,216		16,241		1.5	%
Total	77,995		84,009		7.6	%	75,318		82,522		7.5	%
Total investments	$	1,117,773	$	1,105,396	100.0	%	$	1,083,980	$	1,098,620	100.0	%

The following table sets forth the composition of the Company’s portfolio of fixed maturity securities (both available-for-sale and trading) by rating as of June 30, 2018:

Standard & Poor’s or Equivalent Designation	Fair Value		% of Total
	($ in thousands)
AAA	$	173,971	17.0	%
AA	411,653		40.3	%
A	328,563		32.2	%
BBB	107,200		10.5	%
Total	$	1,021,387	100.0	%

At June 30, 2018, our portfolio of fixed maturity securities contained corporate fixed maturity securities (available-for-sale) with a fair value of $430.3 million. A summary of these securities by industry segment is shown below as of June 30, 2018: 

Industry	Fair Value		% of Total
	($ in thousands)
Industrials and Other	$	116,581	27.0	%
Financial	71,756		16.7	%
Consumer Discretionary	67,785		15.8	%
Health Care	63,750		14.8	%
Consumer Staples	55,980		13.0	%
Utilities	54,493		12.7	%
Total	$	430,345	100.0	%

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Corporate fixed maturity securities (both available-for-sale and trading) include publicly traded securities and privately placed bonds as shown below as of June 30, 2018:

Public/Private	Fair Value		% of Total
	($ in thousands)
Publicly traded	$	399,681	92.9	%
Privately placed	30,664		7.1	%
Total	$	430,345	100.0	%

The amortized cost and fair value of our available-for-sale investments in fixed maturity securities summarized by contractual maturity are as follows:

	June 30, 2018
	Amortized Cost		Fair Value		% of Total Value
	($ in thousands)
Due in:
One year or less	$	40,895	$	40,760	4.0	%
After one year through five years	317,761		312,999		30.6	%
After five years through ten years	193,545		187,368		18.3	%
After ten years	117,692		119,077		11.7	%
Residential mortgage-backed	190,574		184,751		18.1	%
Commercial mortgage and asset-backed	177,286		174,442		17.1	%
Redeemable preferred stock	2,025		1,990		0.2	%
Total	$	1,039,778	$	1,021,387	100.0	%

At June 30, 2018, the Company had no investments in securitizations of alternative-A mortgages or sub-prime mortgages.

Interest Expense

Interest expense was $2.9 million and $2.2 million for the three months ended June 30,2018 and 2017, respectively ($5.5 million and $4.3 million for the respective six month periods). The increase in interest expense over the prior year reflects higher LIBOR rates and a $10.0 million increase in Senior Debt outstanding. See “—Liquidity and Capital Resources—Sources and Uses of Funds” for more information regarding our senior bank debt facility and trust preferred securities.

Amortization of Intangibles

The Company recorded $149,000 and $298,000 of amortization of intangible assets for each of the three and six months ended June 30, 2018 and 2017, respectively. 

Income Tax Expense

Our effective tax rate fluctuates from period to period based on the relative mix of income reported by country and the respective tax rates imposed by each tax jurisdiction. For the three months ended June 30, 2018 and 2017, our U.S. federal income tax expense was 8.2% and 6.5% of income before taxes, respectively (8.4% and 7.2% for the six months endedJune 30, 2018 and 2017, respectively). For U.S.-sourced income, the Company’s U.S. federal income tax expense differs from the amounts computed by applying the federal statutory income tax rate to income before taxes due primarily to interest income on tax-advantaged state and municipal securities (state and municipal securities represent 12.5% and 12.3% of our available-for-sale securities at June 30, 2018 and 2017, respectively), dividends received income, and excess tax benefits on share based compensation. Income tax expense for the three and six months ended June 30, 2018 reflects both the reduction in the enacted U.S. Federal tax rate from 35% in 2017 to 21% in 2018 as a result of Public Law No. 115-97, informally titled the Tax Cuts and Jobs Act (the “Tax Act”), and the changes in our organizational structure in response to the Tax Act.

In response to the Tax Act, we made changes to our structure in 2018 to minimize the impact of the base erosion and anti-abuse tax (“BEAT”) that included the formation of Carolina Re, a Bermuda-domiciled, wholly-owned subsidiary of James River Group, Inc. Carolina Re is a Class 3A reinsurer and made an irrevocable election to be taxed as a U.S. domestic corporation under Section 953(d) of the Code. Effective January 1, 2018, we generally discontinued ceding 70% of our U.S.-written premiums to JRG Re and instead ceded 70% of our U.S.-written premiums to Carolina Re. Carolina Re also entered into a stop loss reinsurance agreement with JRG Re. While Carolina Re is subject to U.S. corporate income tax, we will not be subject to BEAT in 2018 if we have sufficient regular U.S. income tax liability compared to the BEAT liability. The applicability of BEAT depends on a number of factors, and it is uncertain whether we will be subject to BEAT in future periods.

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Financial results reflect provisional amounts related to the December 2017 enactment of the Tax Act. These provisional estimates are based on the Company’s initial analysis and current interpretation of the legislation. Given the complexity of the legislation, anticipated guidance from the U.S. Treasury, and the potential for additional guidance from the SEC or the Financial Accounting Standards Board, these estimates may be adjusted during 2018.

LIQUIDITY AND CAPITAL RESOURCES

Sources and Uses of Funds

We are organized as a Bermuda holding company with our operations conducted by our wholly-owned subsidiaries. Accordingly, our holding company may receive cash through loans from banks, issuance of equity and debt securities, corporate service fees or dividends received from our subsidiaries, and/or other transactions. Our U.S. holding company may receive cash in a similar manner and also through payments from our subsidiaries pursuant to our U.S. consolidated tax allocation agreement.

The payment of dividends by our subsidiaries to us is limited by statute. In general, the laws and regulations applicable to our domestic insurance subsidiaries limit the aggregate amount of dividends or other distributions that they may declare or pay within any 12-month period without advance regulatory approval. Generally, the limitations are based on the greater of statutory net income for the preceding year or 10.0% of statutory surplus at the end of the preceding year. In addition, insurance regulators have broad powers to prevent the reduction of statutory surplus to inadequate levels and could refuse to permit the payment of dividends calculated under any applicable formula. The maximum amount of dividends and return of capital available to us from JRG Re in 2018 is calculated to be approximately $102.3 million. However, any dividend payment is contingent upon continued compliance with Bermuda regulatory requirements, including but not limited to the enhanced solvency requirement calculations. The maximum amount of dividends available to the U.S. holding company from our U.S. insurance subsidiaries during 2018 without regulatory approval is $37.0 million. In the three months ended June 30, 2018, a $15.0 million dividend was paid to the U.S. holding company by James River Insurance Company.

At June 30, 2018, the Bermuda holding company had $1.7 million of cash and cash equivalents. The U.S. holding company had $55.8 million of cash and invested assets, comprised of cash and cash equivalents of $5.9 million, short-term investments of $1.2 million, and other invested assets of $48.7 million, which are not subject to regulatory restrictions. Additionally, our U.K. intermediate holding company had no invested assets and cash of less than ten thousand dollars at June 30, 2018.

Our net written premium to surplus ratio (defined as the ratio of net written premiums to regulatory capital and surplus) is reviewed by management as well as our rating agency as a component of leverage and efficiency of deployed capital. For the six months endedJune 30, 2018 and 2017, our annualized net written premium to surplus ratio was 1.1 to 1.0.

The Company has a $215.0 million senior revolving credit facility (the “Facility”). The Facility is comprised of the following at June 30, 2018:

• A $102.5 million secured revolving facility used by JRG Re to issue letters of credit for the benefit of third-party reinsureds. This portion of our credit facility is secured by our investment securities. At June 30, 2018, the Company had $100.2 million of letters of credit issued under the secured facility.

• A $112.5 million unsecured revolving facility to meet the working capital needs of the Company. All unpaid principal on the revolver is due at maturity. Interest accrues quarterly and is payable in arrears at 3-month LIBOR plus a margin which is currently 1.5% and is subject to change according to terms in the credit agreement. At June 30, 2018, the Company had a drawn balance of $73.3 million outstanding on the unsecured revolver.

The facility has been amended from time to time since its inception in 2013. On December 7, 2016, the Company entered into an Amended and Restated Credit Agreement for the Facility which, among other things, extended the maturity date of the Facility until December 7, 2021 and modified other terms including reducing the rate of interest and reducing the number of financial covenants. On June 8, 2017, the Company entered into a First Amendment to the Facility, which among other things, modified the financial covenants and increased the amount of additional debt the Company may incur under new financings, subject to compliance with certain conditions.

The senior revolving credit facility contains certain financial and other covenants (including risk-based capital, minimum shareholders’ equity levels, maximum ratios of total debt outstanding to total capitalization and minimum fixed charge coverage ratios) with which the Company is in compliance at June 30, 2018.

On August 2, 2017, the Company, and its wholly-owned subsidiary, JRG Re, together as borrowers, entered into a credit agreement that provides the Company with a revolving line of credit of up to $100 million, which may be used for loans and letters of credit made or issued, at the borrowers' option, on a secured or unsecured basis. Obligations under the credit agreement will carry a variable rate of interest subject to terms in the credit agreement and will mature 30 days after notice of termination from the lender. The credit agreement contains certain financial and other covenants with which we are in compliance at June 30, 2018. The loans and letters of credit made or issued under the revolving line of credit may be used to finance the borrowers' general

43

corporate purposes. At June 30, 2018, unsecured loans of $10.0 million and secured letters of credit totaling $6.9 million were outstanding on the facility.

In May 2004, we issued $15.0 million of senior debt due April 29, 2034, with net proceeds to us of $14.5 million. The senior debt is not redeemable by the holder or subject to sinking fund requirements. Interest accrues quarterly and is payable in arrears at a floating rate per annum equal to the 3-month LIBOR plus 3.85%. This senior debt is redeemable at par prior to its stated maturity at our option in whole or in part. The terms of the senior debt contain certain covenants, with which we are in compliance at June 30, 2018, and which, among other things, restrict our ability to assume senior indebtedness secured by our U.S. holding company’s common stock or its subsidiaries’ capital stock or to issue shares of its subsidiaries’ capital stock.

We sold trust preferred securities through five Delaware statutory trusts sponsored and wholly-owned by the Company or its subsidiaries. Each trust used the net proceeds from the sale of its trust preferred securities to purchase our floating-rate junior subordinated debt.

The following table summarizes the nature and terms of the junior subordinated debt and trust preferred securities outstanding at June 30, 2018 (including the Company’s repurchases of a portion of these trust preferred securities):

	James River Capital Trust I		James River Capital Trust II		James River Capital Trust III		James River Capital Trust IV		Franklin Holdings II (Bermuda) Capital Trust I
	($ in thousands)
Issue date	May 26, 2004		December 15, 2004		June 15, 2006		December 11, 2007		January 10, 2008
Principal amount of trust preferred securities		$7,000		$15,000		$20,000		$54,000		$30,000
Principal amount of junior subordinated debt		$7,217		$15,464		$20,619		$55,670		$30,928
Carrying amount of junior subordinated debt net of repurchases		$7,217		$15,464		$20,619		$44,827		$15,928
Maturity date of junior subordinated debt, unless accelerated earlier	May 24, 2034		December 15, 2034		June 15, 2036		December 15, 2037		March 15, 2038
Trust common stock		$217		$464		$619		$1,670		$928
Interest rate, per annum	Three-Month LIBOR plus 4.0%		Three-Month LIBOR plus 3.4%		Three-Month LIBOR plus 3.0%		Three-Month LIBOR plus 3.1%		Three-Month LIBOR plus 4.0%

All of the junior subordinated debt is currently redeemable at 100.0% of the unpaid principal amount at our option.

The junior subordinated debt contains certain covenants with which we are in compliance as of June 30, 2018.

At June 30, 2018 and December 31, 2017, the ratio of total debt outstanding, including both senior debt and junior subordinated debt, to total capitalization (defined as total debt plus total stockholders’ equity) was 22.7% and 22.6%, respectively. Having debt as part of our capital structure allows us to generate a higher return on equity and greater book value per share results than we could by using equity capital alone.

Ceded Reinsurance

Our insurance segments enter into reinsurance contracts to limit our exposure to potential losses arising from large risks, to protect against the aggregation of several risks in a common loss occurrence, and to provide additional capacity for growth. Our reinsurance is contracted under excess of loss and quota share reinsurance contracts. In excess of loss reinsurance, the reinsurer agrees to assume all or a portion of the ceding company’s losses in excess of a specified amount. The premiums payable to the reinsurer are negotiated by the parties based on their assessment of the amount of risk being ceded to the reinsurer because the reinsurer does not share proportionately in the ceding company’s losses. In quota share reinsurance, the reinsurer agrees to assume a specified percentage of the ceding company’s losses arising out of a defined class of business in exchange for a corresponding percentage of premiums. For the three months ended June 30, 2018 and 2017, our net premium retention was 64.3% and 73.8%, respectively (67.6% and 72.3% for the six month periods, respectively).

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The following is a summary of our Excess and Surplus Lines segment’s ceded reinsurance in place as of June 30, 2018:

	Company Retention
Casualty
Primary Specialty Casualty,  including Professional Liability	Up to $1.0 million per occurrence, subject to a $1.0 million aggregate deductible.
Primary Casualty	Up to $2.0 million per occurrence. (1)
Excess Casualty	Up to $1.0 million per occurrence. (2)
Property	Up to $5.0 million per event. (3)

(1) Total exposure to any one claim is generally $1.0 million.

(2) For policies with an occurrence limit of $1.0 million or higher, the excess casualty treaty is set such that our retention is $1.0 million or less. For policies where we also write an underlying primary casualty policy, the net excess casualty limit is added to the primary limit and the retention remains the same at $1.0 million.

(3) The property catastrophe reinsurance treaty has a limit of $40.0 million with one reinstatement.

In our Excess and Surplus Lines segment, we write a small book of excess property insurance, but we do not write primary property insurance. The Excess and Surplus Lines segment has a surplus share reinsurance treaty in effect that was specifically designed to cover property risks. The surplus share treaty along with facultative reinsurance helps ensure that our net retained limit per risk will be $5.0 million or less.

We use catastrophe modeling software to analyze the risk of severe losses from hurricanes and earthquakes on our exposure. We utilize the model in our risk selection, pricing, and to manage our overall portfolio probable maximum loss (“PML”) accumulations. A PML is an estimate of the amount we would expect to pay in any one catastrophe event within a given annual probability of occurrence (i.e. a return period or loss exceedance probability). Based upon the modeling of our Excess and Surplus Lines segment, a $45.0 million gross catastrophe loss would exceed our 1 in 1,000 year PML. In the event of a $45.0 million gross property catastrophe loss to the Excess and Surplus Lines segment, we estimate our pre-tax cost at approximately $7.1 million, including reinstatement premiums and net retentions. In addition to this retention, we would retain any losses in excess of our reinsurance coverage limits.

Our Specialty Admitted Insurance segment purchases reinsurance for at least 50% of the exposed limits on specialty admitted property-casualty business. The segment enters into reinsurance contracts for the individual risk workers’ compensation business as well as fronting and program business. While the segment focuses on casualty business, incidental property risk is incurred in the fronting and program business. The segment is covered for $44.0 million in excess of $1.0 million per occurrence to manage its property exposure to an approximate 1 in 1,000 year PML.

The following is a summary of our Specialty Admitted Insurance segment’s ceded reinsurance in place as of June 30, 2018:

Line of Business	Coverage
Casualty
Workers’ Compensation	Excess of loss coverage for $29.4 million in excess of $600,000. (1)
Workers’ Compensation – Program	Quota share coverage for 50% of the first $600,000 per occurrence. (1)(2)
Commercial Auto – Program	Quota share coverage for 75% of $1.0 million per occurrence.
Commercial Auto – 3 Programs	Quota share coverage for 90% of $1.0 million per occurrence.
General Liability – Program	Quota share coverage for 90% of the first $1.0 million per occurrence and excess of loss coverage for $1.0 million in excess of $1.0 million per occurrence.
Property	Excess of loss coverage for $44.0 million in excess of $1.0 million.

(1) Excluding one program which has quota share coverage for 90% of the first $1.0 million per occurrence and excess of loss coverage for $49.0 million in excess of $1.0 million.

(2) Includes individual risk expansion states and any residual market pools.

In our Casualty Reinsurance segment, we also have limited property catastrophe exposure, primarily through auto physical damage coverage.

In the aggregate, we believe our pre-tax group-wide PML from a 1 in 1,000 year property catastrophe event would not exceed $10.0 million, inclusive of reinstatement premiums payable.

45

We also have a clash and contingency reinsurance treaty to cover both the Excess and Surplus Lines and Specialty Admitted Insurance segments in the event of a claims incident involving more than one of our insureds. The treaty covers $6.0 million in excess of a $2.0 million retention for loss occurrences within the treaty term. This coverage has two reinstatements in the event we exhaust any of the coverage.

The Company’s insurance segments remain liable to policyholders if its reinsurers are unable to meet their contractual obligations under applicable reinsurance agreements. We establish allowances for amounts considered uncollectible. At June 30, 2018, there was no allowance for such uncollectible reinsurance recoverables. To minimize exposure to significant losses from reinsurance insolvencies, the Company evaluates the financial condition of its reinsurers and monitors concentrations of credit risk. The Company generally seeks to purchase reinsurance from reinsurers with A.M. Best financial strength ratings of “A-” (Excellent) or better. The Company’s reinsurance contracts generally require reinsurers that are not authorized as reinsurers under U.S. state insurance regulations or that experience rating downgrades from rating agencies below specified levels to fund their share of the Company’s ceded outstanding losses and loss adjustment expense reserves, typically through the use of irrevocable and unconditional letters of credit. In fronting arrangements, which the Company conducts through its Specialty Admitted Insurance segment, we are subject to credit risk with regard to insurance companies who act as reinsurers for us in such arrangements. We customarily require a collateral trust arrangement to secure the obligations of the insurance entity for whom we are fronting.

At June 30, 2018, we had reinsurance recoverables on unpaid losses of $375.5 million and reinsurance recoverables on paid losses of $13.4 million, and all material recoverable amounts were from companies with A.M. Best ratings of “A-” or better or collateral had been posted by the reinsurer for our benefit.

Credit Risk on Amounts Recoverable from an Indemnifying Party

The Company is also exposed to credit risk relating to a set of insurance contracts with an insured group of companies under which the Company pays losses and loss adjustment expenses on the contract. The Company has indemnity agreements with this group of insured parties (non-insurance entities) and is contractually entitled to receive reimbursement for a significant portion of the losses and loss adjustment expenses paid on behalf of the insured parties and other expenses incurred by the Company. The insured parties are required to collateralize all amounts currently due to the Company and to provide additional collateral sufficient to cover the amounts that may be recoverable under the indemnity agreements, including among other things case loss and loss adjustment expense reserves, IBNR loss and loss adjustment expense reserves, extra contractual obligations and excess of policy limits liabilities. This collateral is currently provided through a collateral trust arrangement established in favor of the Company by a captive insurance company affiliate of the insured group. At June 30, 2018, the cash equivalent collateral held in the collateral trust arrangement was approximately $944.8 million, which exceeds the amount of claims receivable and unpaid reported losses and loss adjustment expenses outstanding. This is a rapidly growing relationship, and as such, there is ongoing exposure to estimated losses and expenses on these contracts growing at a faster pace than growth in our collateral balances. In addition, we have credit exposure if our estimates of future losses and loss adjustment expenses and other amounts recoverable, which are the basis for establishing collateral balances, are lower than actual amounts paid or payable. The amount of our credit exposure in any of these instances could be material. To mitigate these risks, we closely and frequently monitor our exposure compared to our collateral held, and we request additional collateral when our analysis indicates that we have uncollateralized exposure.

Cash Flows

Our sources of funds consist primarily of premiums written, investment income, reinsurance recoveries and proceeds from offerings of debt and equity securities and from sales and redemptions of investments. We use operating cash flows primarily to pay operating expenses, losses and loss adjustment expenses, reinsurance premiums, and income taxes. The following table summarizes our cash flows:

	Six Months Ended June 30,
	2018			2017
	($ in thousands)
Cash and cash equivalents provided by (used in):
Operating activities	$	164,086		$	65,326
Investing activities	(43,732		)	(66,058		)
Financing activities	(16,482		)	(21,281		)
Change in cash and cash equivalents	$	103,872		$	(22,013	)

The growth in cash provided by operating activities (from $65.3 million for the six months endedJune 30, 2017 to $164.1 million for the six months endedJune 30, 2018) reflects a $33.9 million increase in net written premium for the six months endedJune 30, 2018 compared to the same period in 2017. In addition, the growth in reserves for losses and loss adjustment exceeded the growth in premiums receivable by $187.0 million for the six months endedJune 30, 2018 compared to $53.0 million in the

46

six months endedJune 30, 2017. The fact that we are collecting premiums receivable at a quicker rate than we are paying loss and loss adjustment expenses has a favorable impact on our cash provided by operating activities for the six months endedJune 30, 2018 compared to the six months endedJune 30, 2017.

Cash used in financing activities for the six months endedJune 30, 2018 and 2017 included $18.0 million and $17.7 million of dividends paid to shareholders, respectively. 

Ratings

The A.M. Best financial strength rating for our group’s regulated insurance subsidiaries is “A” (Excellent). This rating reflects A.M. Best’s opinion of our insurance subsidiaries’ financial strength, operating performance and ability to meet obligations to policyholders and is not an evaluation directed towards the protection of investors. The rating for our operating insurance and reinsurance companies of “A” (Excellent) is the third highest rating of the thirteen ratings issued by A.M. Best and is assigned to insurers that have, in A.M. Best’s opinion, an excellent ability to meet their ongoing obligations to policyholders.

The financial strength ratings assigned by A.M. Best have an impact on the ability of our regulated subsidiaries to attract and retain agents and brokers and on the risk profiles of the submissions for insurance that our subsidiaries receive. The “A” (Excellent) ratings assigned to our insurance and reinsurance subsidiaries are consistent with our business plans and we believe allow our subsidiaries to actively pursue relationships with the agents and brokers identified in their marketing plans.

EQUITY

The Company issued 221,139 common shares in the six months ended June 30, 2018 with 177,835 new shares related to stock option exercises and 43,304 new shares related to vesting of RSUs. The total common shares outstanding increased from 29,696,682 at December 31, 2017 to 29,917,821 at June 30, 2018.

Share Based Compensation Expense

For the three months ended June 30, 2018 and 2017, the Company recognized $1.7 million and $1.8 million, respectively, of share based compensation expense ($3.1 million and $3.6 million for the respective six month periods). As of June 30, 2018, the Company had $11.9 million of unrecognized share based compensation expense expected to be charged to earnings over a weighted-average period of 2.1 years.

Equity Incentive Plans

Options

The following table summarizes the option activity for the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Outstanding:
Beginning of period	1,479,236		$	27.81	2,234,699		$	22.84
Granted	—		$	—	205,244		$	42.24
Exercised	(255,609	)	$	21.14	(443,114	)	$	18.72
Forfeited	(29,446	)	$	36.26	(50,062	)	$	27.97
End of period	1,194,181		$	29.04	1,946,767		$	25.69
Exercisable, end of period	876,816		$	26.59	992,395		$	20.95

All of the outstanding options vest over two or four years and have a contractual life of seven years from the original date of grant.

47

RSUs

The following table summarizes the RSU activity for the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted- Average Grant Date Fair Value		Shares		Weighted- Average Grant Date Fair Value
Unvested, beginning of period	178,882		$	37.93	196,800		$	24.38
Granted	214,907		$	39.81	119,312		$	42.19
Vested	(63,191	)	$	40.92	(39,113	)	$	32.01
Forfeited	(4,454	)	$	41.04	(19,743	)	$	24.06
Unvested, end of period	326,144		$	38.55	257,256		$	31.50

The vesting period of RSUs granted to employees range from one to five years and vest ratably over the respective vesting period, and the majority vest in three years. All RSUs granted to date to non-employee directors had a one year vesting period.

48

RECONCILIATION OF NON-GAAP MEASURES

Reconciliation of Underwriting Profit

We believe that the disclosure of underwriting profit by individual segment and of the Company as a whole is useful to investors, analysts, rating agencies and other users of our financial information in evaluating our performance because our objective is to consistently earn underwriting profits. We evaluate the performance of our segments and allocate resources based primarily on underwriting profit. Our definition of underwriting profit may not be comparable to that of other companies.

The following table reconciles the underwriting profit by individual segment and for the entire Company to consolidated income before U.S. Federal income taxes:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Underwriting profit of the insurance segments:
Excess and Surplus Lines	$	10,117		$	11,729		$	21,416		$	20,529
Specialty Admitted Insurance	988			553			2,611			1,395
Casualty Reinsurance	1,729			(2,023		)	3,473			(930		)
Total underwriting profit of insurance segments	12,834			10,259			27,500			20,994
Other operating expenses of the Corporate and Other segment	(7,307		)	(6,095		)	(14,738		)	(12,556		)
Underwriting profit (1)	5,527			4,164			12,762			8,438
Net investment income	16,135			13,714			29,391			30,447
Net realized investment (losses) gains	(64		)	307			(874		)	1,354
Amortization of intangible assets	(149		)	(149		)	(298		)	(298		)
Other income and expenses	4			(257		)	108			(57		)
Interest expense	(2,946		)	(2,224		)	(5,468		)	(4,347		)
Income before taxes	$	18,507		$	15,555		$	35,621		$	35,537

(1) Included in underwriting results for the three and six months ended June 30, 2018 is gross fee income of $7.4 million and $15.6 million, respectively ($6.9 million and $12.8 million for the same periods in the prior year).

Reconciliation of Adjusted Net Operating Income

We define adjusted net operating income as net income excluding certain non-operating expenses such as net realized investment gains and losses, expenses related to due diligence costs for various merger and acquisition activities, severance costs associated with terminated employees and interest and other expenses on a leased building that we are deemed to own for accounting purposes. We use adjusted net operating income as an internal performance measure in the management of our operations because we believe it gives our management and other users of our financial information useful insight into our results of operations and our underlying business performance. Adjusted net operating income should not be viewed as a substitute for net income calculated in accordance with GAAP, and our definition of adjusted net operating income may not be comparable to that of other companies.

Our income before taxes and net income for the three and six months ended June 30, 2018 and 2017 reconcile to our adjusted net operating income as follows:

	Three Months Ended June 30,
	2018				2017
	Income Before Taxes		Net Income		Income Before Taxes			Net Income
	($ in thousands)
Income as reported	$	18,507	$	16,984	$	15,555		$	14,541
Net realized investment losses (gains)	64		98		(307		)	(248		)
Other expenses	93		126		346			368
Interest expense on leased building the Company is deemed to own for accounting purposes	457		361		313			203
Adjusted net operating income	$	19,121	$	17,569	$	15,907		$	14,864

49

	Six Months Ended June 30,
	2018				2017
	Income Before Taxes		Net Income		Income Before Taxes			Net Income
	($ in thousands)
Income as reported	$	35,621	$	32,617	$	35,537		$	32,991
Net realized investment losses (gains)	874		763		(1,354		)	(1,082		)
Other expenses	97		146		232			268
Interest expense on leased building the Company is deemed to own for accounting purposes	775		612		625			406
Adjusted net operating income	$	37,367	$	34,138	$	35,040		$	32,583

Tangible Equity (per Share) and Pre Dividend Tangible Equity (per Share)

Key financial measures that we use to assess our longer term financial performance include the percentage growth in our tangible equity per share and our return on tangible equity. We believe tangible equity is a good measure to evaluate the strength of our balance sheet and to compare returns relative to this measure. For the six months ended June 30, 2018, our tangible equity per share decreased by 1.8%. Absent the $18.1 million in dividends to shareholders in the six months ended June 30, 2018, our tangible equity per share increased by 1.9% for the six months ended June 30, 2018. Our operating return on tangible shareholders’ equity was 14.5% for the six months ended June 30, 2018.

We define tangible equity as the sum of shareholders’ equity less goodwill and intangible assets (net of amortization). Our definition of tangible equity may not be comparable to that of other companies, and it should not be viewed as a substitute for shareholders’ equity calculated in accordance with GAAP. The following table reconciles shareholders’ equity to tangible equity as of June 30, 2018 and December 31, 2017 and reconciles tangible equity to tangible equity before dividends as of June 30, 2018:

	June 30, 2018				December 31, 2017
	Equity		Equity per Share		Equity		Equity per Share
	($ in thousands, except share amounts)
Shareholders’ equity	$	689,243	$	23.04	$	694,699	$	23.39
Less:
Goodwill	181,831		6.08		181,831		6.12
Intangible assets	38,036		1.27		38,334		1.29
Tangible equity	$	469,376	$	15.69	$	474,534	$	15.98
Dividends to shareholders for the six months ended June 30, 2018	18,109		0.60
Pre-dividend tangible equity	$	487,485	$	16.29

50

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Market risk is the risk of economic losses due to adverse changes in the estimated fair value of a financial instrument as the result of changes in equity prices, interest rates, foreign currency exchange rates and commodity prices. Our consolidated balance sheets include assets and liabilities with estimated fair values that are subject to market risk. Our primary market risks have been interest rate risk associated with investments in fixed maturities and equity price risk associated with investments in equity securities. We do not have material exposure to foreign currency exchange rate risk or commodity risk.

There have been no material changes in market risk from the information provided in Item 7A of our Annual Report on Form 10-K for the year ended December 31, 2017.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in the reports we file under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer (“CEO”) and Chief Financial Officer (“CFO”), as appropriate, to allow timely decisions regarding required financial disclosure. In connection with the preparation of this quarterly report on Form 10-Q, our management carried out an evaluation, under the supervision and with the participation of our management, including the CEO and CFO, as of June 30, 2018, of the effectiveness of the design and operation of our disclosure controls and procedures, as such term is defined under Rule 13a-15(e) and 15d-15(e) under the Exchange Act. Based upon this evaluation, our CEO and CFO concluded that our disclosure controls and procedures were effective as of June 30, 2018.

Changes in Internal Controls over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during our quarter ended June 30, 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Inherent Limitations on Effectiveness of Controls

The effectiveness of any system of controls and procedures is subject to certain limitations, and, as a result, there can be no assurance that our controls and procedures will detect all errors or fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system will be attained.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

We are party to legal proceedings which arise in the ordinary course of business. We believe that the outcome of such matters, individually and in the aggregate, will not have a material adverse effect on our consolidated financial position.

Item 1A. Risk Factors

There have been no material changes in our risk factors in the quarter ended June 30, 2018 from those 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

None.

Item 3. Defaults Upon Senior Securities.

None.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other information

None.

51

Item 6. Exhibits

Exhibit Number	Description
3.1	Certificate of Incorporation of James River Group Holdings, Ltd. (incorporated by reference to Exhibit 3.1 of the Registration Statement on Form S-1, Registration No. 333-199958, filed with the Commission on November 7, 2014)
3.2	Certificate of Incorporation on Change of Name (incorporated by reference to Exhibit 3.2 of the Registration Statement on Form S-1, Registration No. 333-199958, filed with the Commission on November 7, 2014)
3.3	Memorandum of Association of James River Group Holdings, Ltd. (incorporated by reference to Exhibit 3.3 of the Registration Statement on Form S-1, Registration No. 333-199958, filed with the Commission on November 7, 2014)
3.4	Certificate of Deposit of Memorandum of Increase of Share Capital, dated December 24, 2007 (incorporated by reference to Exhibit 3.4 of the Registration Statement on Form S-1, Registration No. 333-199958, filed with the Commission on November 7, 2014)
3.5	Certificate of Deposit of Memorandum of Increase of Share Capital, dated October 7, 2009 (incorporated by reference to Exhibit 3.5 of the Registration Statement on Form S-1, Registration No. 333-199958, filed with the Commission on November 7, 2014)
3.6	Third Amended and Restated Bye-Laws of James River Group Holdings, Ltd. (incorporated by reference to Exhibit 3.6 to the Annual Report on Form 10-K filed on March 12, 2015, Commission File No. 001-36777)
10.1	Employment Agreement, dated April 2, 2018, between Steven Hartman and James River Group, Inc. (incorporated by reference to Exhibit 10.1 to the Quarterly Report on Form 10-Q filed on May 4, 2018, Commission File No. 001-36777)*
10.2	Employment Agreement, dated April 13, 2018, between Dennis Johnson and James River Group, Inc. (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on April 16, 2018, Commission File No. 001-36777)*
10.3	Termination of Employment Agreement, dated April 13, 2018, between Dennis Johnson and JRG Reinsurance Company Ltd. (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K filed on April 16, 2018, Commission File No. 001-36777)*
31.1	Chief Executive Officer Certification pursuant to Rule 13a-14(a)/15d-14(a)
31.2	Chief Financial Officer Certification pursuant to Rule 13a-14(a)/15d-14(a)
32	Chief Executive Officer and Chief Financial Officer Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

 * Denotes a management contract or compensatory plan or arrangement.

52

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.

		James River Group Holdings, Ltd.
Date:	August 3, 2018	By:	/s/ Robert P. Myron
			Robert P. Myron
			President and Chief Executive Officer
			(Principal Executive Officer)
Date:	August 3, 2018	By:	/s/ Sarah C. Doran
			Sarah C. Doran
			Chief Financial Officer
			(Principal Financial Officer)

53

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Robert P. Myron, certify that:

1. I have reviewed this quarterly report on Form 10-Q of James River Group Holdings, Ltd.;

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(s) 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(s) 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.

Date: August 3, 2018

/s/ Robert P. Myron

Robert P. Myron

President and Chief Executive Officer

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Sarah C. Doran, certify that:

1. I have reviewed this quarterly report on Form 10-Q of James River Group Holdings, Ltd.;

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(s) 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(s) 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.

Date: August 3, 2018

/s/ Sarah C. Doran

Sarah C. Doran

Chief Financial Officer

(Principal Financial Officer)

EX-32

Exhibit 32

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 of James River Group Holdings, Ltd. (the “Company”) on Form 10-Q for the period ended June 30, 2018 as filed with the Securities and Exchange Commission on the date hereof  (the “Report”), we, Robert P. Myron, President and Chief Executive Officer of the Company, and Sarah C. Doran, Chief Financial Officer of the Company, certify, to the best of our knowledge, pursuant to 18 U.S.C. §1350, as adopted pursuant to §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.

/s/ Robert P. Myron

Robert P. Myron

President and Chief Executive Officer

(Principal Executive Officer)

August 3, 2018

/s/ Sarah C. Doran

Sarah C. Doran

Chief Financial Officer

(Principal Financial Officer)

August 3, 2018

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 01, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	James River Group Holdings, Ltd.
Entity Central Index Key	0001620459
Trading Symbol	jrvr
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		29,928,137
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2018

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fixed maturity securities:
Available-for-sale, at fair value (amortized cost: 2018 – $1,039,778; 2017 – $1,008,662)	$ 1,021,387	$ 1,016,098
Trading, at fair value (amortized cost: 2018 – $0; 2017 – $3,801)	0	3,808
Equity securities available-for-sale, at fair value (cost: 2018 – $77,995; 2017 – $75,318)	84,009	82,522
Bank loan participations held-for-investment, at amortized cost, net of allowance	253,689	238,214
Short-term investments	25,140	36,804
Other invested assets	76,813	70,208
Total invested assets	1,461,038	1,447,654
Cash and cash equivalents	267,367	163,495
Accrued investment income	9,502	8,381
Premiums receivable and agents’ balances, net	341,391	352,436
Reinsurance recoverable on unpaid losses	375,535	302,524
Reinsurance recoverable on paid losses	13,365	11,292
Prepaid reinsurance premiums	101,182	91,979
Deferred policy acquisition costs	65,462	72,365
Intangible assets, net	38,036	38,334
Goodwill	181,831	181,831
Other assets	82,667	86,404
Total assets	2,937,376	2,756,695
Liabilities:
Reserve for losses and loss adjustment expenses	1,468,353	1,292,349
Unearned premiums	417,771	418,114
Payables to reinsurers	69,812	56,268
Senior debt	98,300	98,300
Junior subordinated debt	104,055	104,055
Accrued expenses	40,342	39,295
Other liabilities	49,500	53,615
Total liabilities	2,248,133	2,061,996
Commitments and contingent liabilities
Shareholders’ equity:
Common Shares – 2018 and 2017: $0.0002 par value; 200,000,000 shares authorized; 29,917,821 and 29,696,682 shares issued and outstanding, respectively	6	6
Preferred Shares – 2018 and 2017: $0.00125 par value; 20,000,000 shares authorized; no shares issued and outstanding	0	0
Additional paid-in capital	641,290	636,149
Retained earnings	66,677	48,198
Accumulated other comprehensive (loss) income	(18,730)	10,346
Total shareholders’ equity	689,243	694,699
Total liabilities and shareholders’ equity	$ 2,937,376	$ 2,756,695

XML

Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Available-for-sale debt securities, amortized cost	$ 1,039,778	$ 1,008,662
Trading securities, debt, amortized cost	0	3,801
Available-for-sale equity securities, amortized cost	$ 77,995	$ 75,318
Common stock, par value (in dollars per share)	$ 0.0002	$ 0.0002
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	29,917,821	29,696,682
Common stock, shares outstanding	29,917,821	29,696,682
Preferred stock par value (in dollars per share)	$ 0.00125	$ 0.00125
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Gross written premiums	$ 293,378	$ 281,475	$ 591,494	$ 505,654
Ceded written premiums	(104,772)	(73,651)	(191,910)	(139,920)
Net written premiums	188,606	207,824	399,584	365,734
Change in net unearned premiums	19,604	(23,747)	9,568	(26,970)
Net earned premiums	208,210	184,077	409,152	338,764
Net investment income	16,135	13,714	29,391	30,447
Net realized and unrealized (losses) gains on investments	(64)	307	(874)	1,354
Other income	3,760	4,296	8,716	8,231
Total revenues	228,041	202,394	446,385	378,796
Expenses
Losses and loss adjustment expenses	154,595	131,084	298,367	236,453
Other operating expenses	51,751	53,036	106,534	101,929
Other expenses	93	346	97	232
Interest expense	2,946	2,224	5,468	4,347
Amortization of intangible assets	149	149	298	298
Total expenses	209,534	186,839	410,764	343,259
Income before taxes	18,507	15,555	35,621	35,537
Income tax expense	1,523	1,014	3,004	2,546
Net income	16,984	14,541	32,617	32,991
Other comprehensive (loss) income:
Net unrealized (losses) gains, net of taxes of $(183) and $(727) in 2018 and $1,157 and $2,671 in 2017	(6,558)	6,708	(25,105)	10,742
Total comprehensive income	$ 10,426	$ 21,249	$ 7,512	$ 43,733
Per share data:
Basic earnings per share (in dollars per share)	$ 0.57	$ 0.49	$ 1.09	$ 1.12
Diluted earnings per share (in dollars per share)	0.56	0.48	1.08	1.09
Dividend declared per share (in dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.60
Weighted-average common shares outstanding:
Basic (in shares)	29,882,988	29,406,877	29,823,982	29,348,557
Diluted (in shares)	30,293,933	30,307,099	30,243,946	30,317,585

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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Tax on net unrealized gains (losses)	$ (183)	$ (727)	$ 1,157	$ 2,671

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Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Balance (in shares) at Dec. 31, 2016		29,257,566
Balance at Dec. 31, 2016	$ 693,221	$ 6	$ 636,856	$ 55,232	$ 1,127
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	32,991			32,991
Other comprehensive income	10,742				10,742
Dividends	(17,728)			(17,728)
Exercised (in shares)		185,159
Exercise of stock options	(2,458)		(2,458)
Vesting of RSUs (in shares)		24,922
Vesting of RSUs	(627)		(627)
Compensation expense under share incentive plans	3,578		3,578
Balance (in shares) at Jun. 30, 2017		29,467,647
Balance at Jun. 30, 2017	$ 719,719	$ 6	637,349	70,495	11,869
Balance (in shares) at Dec. 31, 2017	29,696,682	29,696,682
Balance at Dec. 31, 2017	$ 694,699	$ 6	636,149	48,198	10,346
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	32,617			32,617
Net income | ASU 2016-01				(922)
Other comprehensive income	(25,105)				(25,105)
Dividends	(18,109)			(18,109)
Exercised (in shares)		177,835
Exercise of stock options	2,803		2,803
Vesting of RSUs (in shares)		43,304
Vesting of RSUs	(777)		(777)
Compensation expense under share incentive plans	$ 3,115		3,115
Balance (in shares) at Jun. 30, 2018	29,917,821	29,917,821
Balance at Jun. 30, 2018	$ 689,243	$ 6	$ 641,290	66,677	(18,730)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASU | ASU 2016-01	0			4,682	(4,682)
Cumulative effect of adoption of ASU | ASU 2018-02	$ 0			$ (711)	$ 711

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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net cash provided by operating activities	$ 164,086	$ 65,326
Securities available-for-sale:
Purchases – fixed maturity securities	(178,600)	(196,208)
Sales – fixed maturity securities	65,275	33,723
Maturities and calls – fixed maturity securities	81,138	128,640
Purchases – equity securities	(5,949)	0
Sales – equity securities	3,179	409
Bank loan participations:
Purchases	(121,285)	(144,172)
Sales	77,933	79,959
Maturities	28,053	28,638
Other invested assets:
Purchases	(6,993)	(6,322)
Return of capital	308	0
Short-term investments, net	11,664	9,496
Securities receivable or payable, net	2,015	1,205
Purchases of property and equipment	(470)	(1,426)
Net cash used in investing activities	(43,732)	(66,058)
Financing activities
Dividends paid	(18,042)	(17,729)
Issuance of common shares under equity incentive plans	3,900	868
Common share repurchases	(1,874)	(3,953)
Other financing activities	(466)	(467)
Net cash used in financing activities	(16,482)	(21,281)
Change in cash and cash equivalents	103,872	(22,013)
Cash and cash equivalents at beginning of period	163,495	109,784
Cash and cash equivalents at end of period	267,367	87,771
Supplemental information
Interest paid	$ 5,368	$ 4,329

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Accounting Policies

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Accounting Policies

Accounting Policies

Organization

James River Group Holdings, Ltd. (referred to as “JRG Holdings” or, with its subsidiaries, the “Company”) is an exempted holding company registered in Bermuda, organized for the purpose of acquiring and managing insurance and reinsurance entities.

The Company owns six insurance companies based in the United States (“U.S.”) focused on specialty insurance niches and two Bermuda-based reinsurance companies as described below:

• James River Group Holdings UK Limited (“James River UK”) is an insurance holding company formed in 2015 in the United Kingdom (“U.K.”). JRG Holdings contributed James River Group, Inc. (“James River Group”), a U.S. insurance holding company, to James River UK in 2015.

• James River Group is a Delaware domiciled insurance holding company formed in 2002 which owns all of the Company’s U.S.-based subsidiaries, either directly or indirectly through one of its wholly-owned U.S. subsidiaries. James River Group oversees the Company’s U.S. insurance operations and maintains all of the outstanding debt in the U.S.

• James River Insurance Company is an Ohio domiciled excess and surplus lines insurance company that, with its wholly-owned insurance subsidiary, James River Casualty Company, is authorized to write business in every state and the District of Columbia.

• Falls Lake National Insurance Company (“Falls Lake National”) is an Ohio domiciled insurance company which wholly owns Stonewood Insurance Company (“Stonewood Insurance”), a North Carolina domiciled company, Falls Lake General Insurance Company, an Ohio domiciled company, and Falls Lake Fire and Casualty Company, a California domiciled company. Falls Lake National began writing specialty admitted fronting and program business in late 2013. Falls Lake Fire and Casualty began operations in 2016.

• JRG Reinsurance Company Ltd. (“JRG Re”) was formed in 2007 and commenced operations in 2008. JRG Re, a Bermuda domiciled reinsurer, primarily provides non-catastrophe casualty reinsurance to U.S. third parties.

• Carolina Re Ltd (“Carolina Re”) was formed in 2018 and provides reinsurance to the Company’s U.S.-based insurance subsidiaries. Carolina Re is a party to a stop loss reinsurance treaty with JRG Re.

Basis of Presentation

The accompanying condensed consolidated financial statements and notes have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and do not contain all of the information and footnotes required by U.S. GAAP for complete financial statements. The condensed consolidated financial statements include the results of the Company and its subsidiaries from their respective dates of inception or acquisition, as applicable. Readers are urged to review the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for a more complete description of the Company’s business and accounting policies. In the opinion of management, all adjustments necessary for a fair presentation of the condensed consolidated financial statements have been included. Such adjustments consist only of normal recurring items. Interim results are not necessarily indicative of results of operations for the full year. The consolidated balance sheet as of December 31, 2017 was derived from the Company’s audited annual consolidated financial statements.

Intercompany transactions and balances have been eliminated.

Estimates and Assumptions

Preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying disclosures. Those estimates are inherently subject to change, and actual results may ultimately differ from those estimates.

Variable Interest Entities

Entities that do not have sufficient equity at risk to allow the entity to finance its activities without additional financial support or in which the equity investors, as a group, do not have the characteristic of a controlling financial interest are referred to as variable interest entities (“VIE”). A VIE is consolidated by the variable interest holder that is determined to have the controlling financial interest (primary beneficiary) as a result of having both the power to direct the activities of a VIE that most significantly impact the VIE’s economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE’s capital structure, contractual terms, nature of the VIE’s operations and purpose, and the Company’s relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE. The Company reassesses its VIE determination with respect to an entity on an ongoing basis.

The Company holds interests in VIEs through certain equity method investments included in “other invested assets” in the accompanying condensed consolidated balance sheets. The Company has determined that it should not consolidate any of the VIEs as it is not the primary beneficiary in any of the relationships. Although the investments resulted in the Company holding variable interests in the entities, they did not empower the Company to direct the activities that most significantly impact the economic performance of the entities. The Company’s investments related to these VIEs totaled $32.2 million and $32.1 million as of June 30, 2018 and December 31, 2017, respectively, representing the Company’s maximum exposure to loss.

Income Tax Expense

Our effective tax rate fluctuates from period to period based on the relative mix of income reported by country and the respective tax rates imposed by each tax jurisdiction. For the three months ended June 30, 2018 and 2017, our U.S. federal income tax expense was 8.2% and 6.5% of income before taxes, respectively (8.4% and 7.2% for the six months ended June 30, 2018 and 2017, respectively). For U.S.-sourced income, the Company’s U.S. federal income tax expense differs from the amounts computed by applying the federal statutory income tax rate (21% in 2018 and 35% in 2017) to income before taxes due primarily to interest income on tax-advantaged state and municipal securities (state and municipal securities represent 12.5% and 12.3% of our available-for-sale securities at June 30, 2018 and 2017, respectively), dividends received income, and excess tax benefits on share based compensation.

Financial results reflect provisional amounts related to the December 2017 enactment of the Tax Cuts and Jobs Act of 2017 (the “Tax Act”). These provisional estimates are based on the Company’s initial analysis and current interpretation of the legislation. Given the complexity of the legislation, anticipated guidance from the U.S. Treasury, and the potential for additional guidance from the SEC or the Financial Accounting Standards Board (“FASB”), these estimates may be adjusted during 2018.

Adopted Accounting Standards

Effective January 1, 2018, the Company adopted Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606). The guidance applies to all companies that either enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards, such as insurance contracts. Under this guidance, a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. Judgments required in adopting this update may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The adoption of ASU 2014-09 had no impact on reported fee income and there was no cumulative effect of initially applying the update.

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. Among other things, this ASU requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. Upon adoption on January 1, 2018, the Company made a $4.7 million cumulative-effect adjustment to increase retained earnings and reduce accumulated other comprehensive income. The adoption of ASU 2016-01 did not materially impact the Company's financial position, cash flows, or total comprehensive income. The Company's results of operations were impacted as changes in fair value of equity instruments are now presented in net income rather than other comprehensive (loss) income. For the three and six months ended June 30, 2018, the respective impact on net income was an increase of $451,000 ($0.02 and $0.01 increase in basic and diluted earnings per share, respectively) and a reduction of $922,000 ($0.03 reduction in basic and diluted earnings per share).

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. This update was issued as a result of the enactment of the Tax Act on December 22, 2017. The ASU allows for the option to reclassify the stranded tax effects resulting from the implementation of the Tax Act out of accumulated other comprehensive income and into retained earnings. As the adoption of ASU 2016-01 in 2018 resulted in the reclassification of the entire unrealized balance on equity securities from accumulated other comprehensive income into retained earnings, only the stranded tax effects on the unrealized balances of fixed income securities were impacted by the adoption of ASU 2018-02. The reclassification resulted in a $711,000 decrease to the Company's retained earnings with a corresponding increase to accumulated other comprehensive income in the first quarter of 2018.

Prospective Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). Under current guidance for lessees, leases are only included on the balance sheet if certain criteria, classifying the agreement as a capital lease, are met. This update will require the recognition of a right-of-use asset and a corresponding lease liability, discounted to the present value, for all leases that extend beyond 12 months. This ASU is effective for annual and interim reporting periods beginning after December 15, 2018. Upon adoption, leases will be recognized and measured at the beginning of the earliest period presented using a modified retrospective approach. The Company is currently evaluating ASU 2016-02 to determine the potential impact that adopting this standard will have on its financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. Current GAAP delays the recognition of credit losses until it is probable a loss has been incurred. The update will require financial assets measured at amortized cost, such as bank loan participations held for investment, to be presented at the net amount expected to be collected by means of an allowance for credit losses that runs through net income. Credit losses relating to available-for-sale debt securities will also be recorded through an allowance for credit losses, with the amount of the allowance limited to the amount by which fair value is below amortized cost. This ASU is effective for annual and interim reporting periods beginning after December 15, 2019. Upon adoption, this ASU will be applied using the modified-retrospective approach, by which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period presented. The Company has not yet completed the analysis of how adopting this ASU will affect the Company’s financial statements.

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Investments

6 Months Ended

Jun. 30, 2018

Investments [Abstract]

Investments

Investments

The Company’s available-for-sale investments are summarized as follows:

	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
June 30, 2018
Fixed maturity securities:
State and municipal	$	137,055	$	3,590	$	(2,272	)	$	138,373
Residential mortgage-backed	190,574		445		(6,268		)	184,751
Corporate	439,993		1,655		(11,303		)	430,345
Commercial mortgage and asset-backed	177,286		85		(2,929		)	174,442
Obligations of U.S. government corporations and agencies	5,702		—		(13		)	5,689
U.S. Treasury securities and obligations guaranteed by the U.S. government	87,143		26		(1,372		)	85,797
Redeemable preferred stock	2,025		—		(35		)	1,990
Total fixed maturity securities	1,039,778		5,801		(24,192		)	1,021,387
Equity securities	77,995		6,675		(661		)	84,009
Total investments available-for-sale	$	1,117,773	$	12,476	$	(24,853	)	$	1,105,396
December 31, 2017
Fixed maturity securities:
State and municipal	$	139,382	$	5,587	$	(603	)	$	144,366
Residential mortgage-backed	160,379		723		(2,441		)	158,661
Corporate	408,857		7,503		(2,639		)	413,721
Commercial mortgage and asset-backed	182,595		714		(698		)	182,611
Obligations of U.S. government corporations and agencies	35,948		—		(101		)	35,847
U.S. Treasury securities and obligations guaranteed by the U.S. government	79,476		37		(639		)	78,874
Redeemable preferred stock	2,025		—		(7		)	2,018
Total fixed maturity securities	1,008,662		14,564		(7,128		)	1,016,098
Equity securities	75,318		7,830		(626		)	82,522
Total investments available-for-sale	$	1,083,980	$	22,394	$	(7,754	)	$	1,098,620

The amortized cost and fair value of available-for-sale investments in fixed maturity securities at June 30, 2018 are summarized, by contractual maturity, as follows:

	Cost or Amortized Cost		Fair Value
	(in thousands)
One year or less	$	40,895	$	40,760
After one year through five years	317,761		312,999
After five years through ten years	193,545		187,368
After ten years	117,692		119,077
Residential mortgage-backed	190,574		184,751
Commercial mortgage and asset-backed	177,286		174,442
Redeemable preferred stock	2,025		1,990
Total	$	1,039,778	$	1,021,387

Actual maturities may differ for some securities because borrowers have the right to call or prepay obligations with or without penalties.

The following table shows the Company’s gross unrealized losses and fair value for available-for-sale securities aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position:

	Less Than 12 Months					12 Months or More					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in thousands)
June 30, 2018
Fixed maturity securities:
State and municipal	$	62,247	$	(1,800	)	$	10,402	$	(472	)	$	72,649	$	(2,272	)
Residential mortgage-backed	91,518		(2,123		)	76,384		(4,145		)	167,902		(6,268		)
Corporate	292,519		(7,730		)	57,914		(3,573		)	350,433		(11,303		)
Commercial mortgage and asset-backed	112,250		(2,194		)	20,388		(735		)	132,638		(2,929		)
Obligations of U.S. government corporations and agencies	—		—			5,689		(13		)	5,689		(13		)
U.S. Treasury securities and obligations guaranteed by the U.S. government	70,158		(1,115		)	13,397		(257		)	83,555		(1,372		)
Redeemable preferred stock	1,990		(35		)	—		—			1,990		(35		)
Total fixed maturity securities	630,682		(14,997		)	184,174		(9,195		)	814,856		(24,192		)
Equity securities	10,128		(262		)	5,627		(399		)	15,755		(661		)
Total investments available-for-sale	$	640,810	$	(15,259	)	$	189,801	$	(9,594	)	$	830,611	$	(24,853	)
December 31, 2017
Fixed maturity securities:
State and municipal	$	40,117	$	(318	)	$	10,662	$	(285	)	$	50,779	$	(603	)
Residential mortgage-backed	50,447		(261		)	84,193		(2,180		)	134,640		(2,441		)
Corporate	113,464		(846		)	66,954		(1,793		)	180,418		(2,639		)
Commercial mortgage and asset-backed	53,965		(244		)	25,299		(454		)	79,264		(698		)
Obligations of U.S. government corporations and agencies	3,024		(1		)	32,154		(100		)	35,178		(101		)
U.S. Treasury securities and obligations guaranteed by the U.S. government	50,760		(430		)	26,707		(209		)	77,467		(639		)
Redeemable preferred stock	2,018		(7		)	—		—			2,018		(7		)
Total fixed maturity securities	313,795		(2,107		)	245,969		(5,021		)	559,764		(7,128		)
Equity securities	5,859		(65		)	5,665		(561		)	11,524		(626		)
Total investments available-for-sale	$	319,654	$	(2,172	)	$	251,634	$	(5,582	)	$	571,288	$	(7,754	)

The Company held securities of 219 issuers that were in an unrealized loss position at June 30, 2018 with a total fair value of $830.6 million and gross unrealized losses of $24.9 million. None of the fixed maturity securities with unrealized losses has ever missed, or been delinquent on, a scheduled principal or interest payment.

At June 30, 2018, 100.0% of the Company’s fixed maturity security portfolio was rated “BBB-” or better (“investment grade”) by Standard & Poor’s or received an equivalent rating from another nationally recognized rating agency.

Management concluded that none of the fixed maturity securities with an unrealized loss at June 30, 2018 or December 31, 2017 experienced an other-than-temporary impairment. Management does not intend to sell available-for-sale securities in an unrealized loss position, and it is not “more likely than not” that the Company will be required to sell these securities before a recovery in their value to their amortized cost basis occurs.

At December 31, 2017, management concluded that one equity security, based on the severity and duration of the impairment, had experienced an other-than-temporary impairment. Accordingly, the Company recorded an impairment loss of $1.5 million in 2017. Management concluded that none of the other equity securities with an unrealized loss at December 31, 2017 experienced an other-than-temporary impairment.

At December 31, 2017, the Company held a participation in a loan with unpaid principal of $807,000 issued by a company that produces and supplies power to Puerto Rico through a power purchase agreement with Puerto Rico Electric Power Authority (“PREPA”), a public corporation and governmental agency of the Commonwealth of Puerto Rico. Management concluded that an allowance for credit losses should be established on the loan at December 31, 2017 to reduce its carrying value to $0. In the first quarter of 2018, the full outstanding principal on the loan was repaid and the Company recognized a realized gain of $807,000 on the repayment.

Management concluded that certain loans in the Company's bank loan portfolio were impaired as of June 30, 2018. The aggregate allowance for credit losses was $1.2 million at June 30, 2018 on impaired loans from three issuers with a total carrying value of $2.2 million and unpaid principal of $3.5 million. At December 31, 2017, the aggregate allowance for credit losses was $3.2 million on impaired loans from five issuers with a total carrying value of $5.1 million and unpaid principal of $8.4 million. The aggregate allowance for credit losses on impaired loans was $705,000 at June 30, 2017 and $943,000 at December 31, 2016.

Bank loan participations generally have a credit rating that is below investment grade (i.e. below “BBB-” for Standard & Poor’s) at the date of purchase. These bank loans are primarily senior, secured floating-rate debt rated “BB”, “B”, or “CCC” by Standard & Poor’s or an equivalent rating from another nationally recognized rating agency. These bank loans include assignments of, and participations in, performing and non-performing senior corporate debt generally acquired through primary bank syndications and in secondary markets. Bank loans consist of, but are not limited to, term loans, the funded and unfunded portions of revolving credit loans, and other similar loans and investments. Management believed that it was probable at the time that these loans were acquired that the Company would be able to collect all contractually required payments receivable.

Generally, the accrual of interest on a bank loan participation is discontinued when the contractual payment of principal or interest has become 90 days past due or management has serious doubts about further collectability of principal or interest. A bank loan participation may remain on accrual status if it is in the process of collection and is either guaranteed or well secured. Generally, bank loan participations are restored to accrual status when the obligation is brought current, has performed in accordance with the contractual terms for a reasonable period of time, and the ultimate collectability of the total contractual principal and interest is no longer in doubt. Interest received on nonaccrual loans generally is reported as investment income. There were no bank loans on nonaccrual status at June 30, 2018 or December 31, 2017.

The allowance for credit losses is maintained at a level believed adequate by management to absorb estimated probable credit losses. Management’s periodic evaluation of the adequacy of the allowance is based on consultations and advice of the Company’s independent investment manager, known and inherent risks in the portfolio, adverse situations that may affect the borrower’s ability to repay, the estimated value of any underlying collateral, current economic conditions, and other relevant factors. The Company generally records an allowance equal to the difference between the fair value and the amortized cost of bank loans that it has determined to be impaired as a practical expedient for an estimate of probable future cash flows to be collected on those bank loans. Bank loans are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote.

The average recorded investment in impaired bank loans was $3.7 million and $5.0 million during the six months ended June 30, 2018 and 2017, respectively. Investment income of $65,000 and $179,000, respectively, was recognized during the time within those periods that the loans were impaired. The Company recorded net realized investment losses of $896,000 and $893,000 in the three and six months ended June 30, 2018, respectively, for changes in the fair value of impaired bank loans ($42,000 of net realized investment losses and $135,000 of net realized investment gains in the three and six months ended June 30, 2017, respectively).

Changes in unrealized gains or losses on securities held for trading are recorded as trading gains or losses within net investment income. Net investment income for the three and six months ended June 30, 2018 includes $1,000 and $4,000 of net trading losses, respectively, all relating to securities sold during the three and six months ended June 30, 2018.

The Company’s net realized and unrealized gains and losses on investments are summarized as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Fixed maturity securities:
Gross realized gains	$	360		$	18		$	382		$	356
Gross realized losses	(252		)	(31		)	(475		)	(327		)
	108			(13		)	(93		)	29
Bank loan participations:
Gross realized gains	360			471			1,580			1,607
Gross realized losses	(1,006		)	(150		)	(1,106		)	(689		)
	(646		)	321			474			918
Equity securities:
Gross realized gains	—			—			—			409
Gross realized losses	(47		)	—			(62		)	—
Changes in fair values of equity securities	521			—			(1,189		)	—
	474			—			(1,251		)	409
Short-term investments and other:
Gross realized gains	—			—			—			—
Gross realized losses	—			(1		)	(4		)	(2		)
	—			(1		)	(4		)	(2		)
Total	$	(64	)	$	307		$	(874	)	$	1,354

Realized investment gains or losses are determined on a specific identification basis. 

The Company invests selectively in private debt and equity opportunities. These investments, which together comprise the Company’s other invested assets, are primarily focused in renewable energy, limited partnerships, and bank holding companies.

	Carrying Value				Investment Income
	June 30,		December 31,		Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017		2018		2017
	(in thousands)
Renewable energy LLCs (a)	$	32,204	$	32,063	$	530	$	1,521	$	1,741	$	7,115
Renewable energy notes receivable (b)	8,750		7,278		328		49		625		49
Limited partnerships (c)	31,359		26,367		1,092		703		1,319		1,085
Bank holding companies (d)	4,500		4,500		86		86		172		172
Total other invested assets	$	76,813	$	70,208	$	2,036	$	2,359	$	3,857	$	8,421

(a) The Company’s Corporate and Other segment owns equity interests ranging from 2.6% to 32.8% in various LLCs whose principal objective is capital appreciation and income generation from owning and operating renewable energy production facilities (wind and solar). The LLCs are managed by an affiliate of the Company and the Company’s Non-Executive Chairman has invested in certain of these LLCs. The equity method is used to account for the Company’s LLC investments. Income for the LLCs primarily reflects adjustments to the carrying values of investments in renewable energy projects to their determined fair values. The fair value adjustments are included in revenues for the LLCs. Expenses for the LLCs are not significant and are comprised of administrative and interest expenses. The Company received cash distributions from these investments totaling $2.1 million and $3.6 million in the six months ended June 30, 2018 and 2017, respectively.

(b) The Company has invested in notes receivable for renewable energy projects. At June 30, 2018, the Company holds an $8.8 million note issued by an affiliate of the Company. Interest on the note, which matures in 2021, is fixed at 15.0%. Interest income on the note was $328,000 and $625,000 for the three and six months ended June 30, 2018, respectively ($49,000 for the three and six months ended June 30, 2017).

(c) The Company owns investments in limited partnerships that invest in concentrated portfolios including publicly-traded small cap equities, loans of middle market private equity sponsored companies, equity tranches of collateralized loan obligations (“CLOs”), and tranches of distressed home loans. Income from the partnerships is recognized under the equity method of accounting. The Company’s Corporate and Other segment held an investment in a limited partnership with a carrying value of $3.2 million at June 30, 2018. The Company recognized investment income of $333,000 and $208,000 on the investment for the three and six months ended June 30, 2018, respectively ($152,000 and $220,000for the three and six months ended June 30, 2017, respectively). The Company’s Excess and Surplus Lines segment holds investments in limited partnerships of $28.1 million at June 30, 2018. Investment income of $759,000 and $1.1 million was recognized on the investments for the three and six months ended June 30, 2018, respectively ($551,000 and $865,000for the three and six months ended June 30, 2017, respectively). At June 30, 2018, the Company’s Excess and Surplus Lines segment has outstanding commitments to invest another $625,000 in these limited partnerships.

(d) The Company holds $4.5 million of subordinated notes issued by a bank holding company. Interest on the notes, which mature on August 12, 2023, is fixed at 7.6% per annum. Interest income on the notes was $86,000 and $172,000, respectively, in both the three and six months ended June 30, 2018 and 2017. The Company’s Non-Executive Chairman was previously the Lead Independent Director of the bank holding company and an investor in the bank holding company. Additionally, one of the Company’s directors was an investor in the bank holding company and is currently a lender to the bank holding company.

At June 30, 2018, the Company held an investment in a CLO where one of the underlying loans was issued by the bank holding company. The investment, with a carrying value of $4.7 million at June 30, 2018, is classified as an available-for-sale fixed maturity.

The Company previously held common shares issued by the bank holding company. Realized investments gains of $409,000 were recognized in the six months ended June 30, 2017 related to the sale of common shares of the bank holding company.

The Company holds a $1.0 million certificate of deposit issued by the bank holding company. The certificate of deposit, which matures on December 19, 2018, is carried as a short-term investment. Interest income of $3,000 was recognized on this investment for the six months ended June 30, 2018 and 2017.

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Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets

On December 11, 2007, the Company completed an acquisition of James River Group by acquiring 100% of the outstanding shares of James River Group common stock, referred to herein as the “Merger”. The transaction was accounted for under the purchase method of accounting, and goodwill and intangible assets were recognized by the Company as a result of the transaction. Goodwill resulting from the Merger was $181.8 million at June 30, 2018 and December 31, 2017.

The gross carrying amounts and accumulated amortization for each major specifically identifiable intangible asset class were as follows: 

		June 30, 2018				December 31, 2017
	Life (Years)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
		($ in thousands)
Intangible Assets
Trademarks	Indefinite	$	22,200	$	—	$	22,200	$	—
Insurance licenses and authorities	Indefinite	9,164		—		9,164		—
Identifiable intangibles not subject to amortization		31,364		—		31,364		—
Broker relationships	24.6	11,611		4,939		11,611		4,641
Identifiable intangible assets subject to amortization		11,611		4,939		11,611		4,641
		$	42,975	$	4,939	$	42,975	$	4,641

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Earnings Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

The following represents a reconciliation of the numerator and denominator of the basic and diluted earnings per share computations contained in the condensed consolidated financial statements:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands, except share and per share amounts)
Net income to shareholders	$	16,984		$	14,541		$	32,617		$	32,991
Weighted average common shares outstanding:
Basic	29,882,988			29,406,877			29,823,982			29,348,557
Common share equivalents	410,945			900,222			419,964			969,028
Diluted	30,293,933			30,307,099			30,243,946			30,317,585
Earnings per share:
Basic	$	0.57		$	0.49		$	1.09		$	1.12
Common share equivalents	(0.01		)	(0.01		)	(0.01		)	(0.03		)
Diluted	$	0.56		$	0.48		$	1.08		$	1.09

Common share equivalents relate to stock options and restricted share units (“RSU’s”). For the three and six months ended June 30, 2018, common share equivalents of 182,246 and 187,502 shares, respectively, were excluded from the calculations of diluted earnings per share as their effects were anti-dilutive. For the three and six months ended June 30, 2017, common share equivalents of 201,821 and 150,075 shares, respectively, were excluded from the calculations of diluted earnings per share as their effects were anti-dilutive.

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Reserve for Losses and Loss Adjustment Expenses

6 Months Ended

Jun. 30, 2018

Liability for Claims and Claims Adjustment Expense [Abstract]

Reserve for Losses and Loss Adjustment Expenses

Reserve for Losses and Loss Adjustment Expenses

The following table provides a reconciliation of the beginning and ending reserve balances for losses and loss adjustment expenses, net of reinsurance, to the gross amounts reported in the condensed consolidated balance sheets:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018			2017
	(in thousands)
Reserve for losses and loss adjustment expenses net of reinsurance recoverables at beginning of period	$	1,038,303	$	791,781	$	989,825		$	761,128
Add: Incurred losses and loss adjustment expenses net of reinsurance:
Current year	152,371		129,369		298,753			238,152
Prior years	2,224		1,715		(386		)	(1,699		)
Total incurred losses and loss and adjustment expenses	154,595		131,084		298,367			236,453
Deduct: Loss and loss adjustment expense payments net of reinsurance:
Current year	20,577		13,908		32,754			17,606
Prior years	79,503		69,449		162,620			140,467
Total loss and loss adjustment expense payments	100,080		83,357		195,374			158,073
Reserve for losses and loss adjustment expenses net of reinsurance recoverables at end of period	1,092,818		839,508		1,092,818			839,508
Add: Reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period	375,535		221,553		375,535			221,553
Reserve for losses and loss adjustment expenses gross of reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period	$	1,468,353	$	1,061,061	$	1,468,353		$	1,061,061

The Company experienced $2.2 million of adverse reserve development in the three months ended June 30, 2018 on the reserve for losses and loss adjustment expenses held at December 31, 2017. This reserve development included $58,000 of favorable development in the Excess and Surplus Lines segment, primarily from $1.9 million of favorable development on the property catastrophe losses from the September 2017 storms coupled with adverse development in commercial auto business and favorable development in other core Excess and Surplus Lines. The Specialty Admitted Insurance segment experienced $167,000 of favorable development, primarily due to favorable development in the workers' compensation business for prior accident years, partially offset by adverse development on certain terminated program business. The Company also experienced $2.4 million of adverse development in the Casualty Reinsurance segment primarily related to losses from risk profiles and treaty structures that the Company no longer writes.

The Company experienced $1.7 million of adverse reserve development in the three months ended June 30, 2017 on the reserve for losses and loss adjustment expenses held at December 31, 2016. This reserve development included $1.4 million of favorable development in the Excess and Surplus Lines segment. The Specialty Admitted Insurance segment experienced $949,000 of adverse development, primarily due to adverse development in the programs business. The Company also experienced $2.2 million of adverse development for the Casualty Reinsurance segment. The development was mostly related to the 2010 and 2012 contracts with one reinsured.

The Company experienced $386,000 of favorable reserve development in the six months ended June 30, 2018 on the reserve for losses and loss adjustment expenses held at December 31, 2017. This reserve development included $1.2 million of favorable development in the Excess and Surplus Lines segment, primarily from $1.9 million of favorable development on the property catastrophe losses from the September 2017 storms coupled with adverse development in commercial auto business and favorable development in other core Excess and Surplus Lines. The Specialty Admitted Insurance segment experienced $1.5 million of favorable development, primarily due to favorable development in the workers' compensation business for prior accident years, partially offset by adverse development on certain terminated program business. The Company also experienced $2.3 million of adverse development in the Casualty Reinsurance segment primarily related to losses from risk profiles and treaty structures that the Company no longer writes.

The Company experienced $1.7 million of favorable reserve development in the six months ended June 30, 2017 on the reserve for losses and loss adjustment expenses held at December 31, 2016. This reserve development included $4.7 million of favorable development in the Excess and Surplus Lines segment. The Specialty Admitted Insurance segment experienced $907,000 of adverse development, primarily due to adverse development in the programs business which were partially offset by favorable development in the workers' compensation business. The Company also experienced $2.1 million of adverse development for the Casualty Reinsurance segment. The development was mostly related to the 2010 and 2012 contracts with one reinsured.

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Other Comprehensive (Loss) Income

6 Months Ended

Jun. 30, 2018

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Other Comprehensive (Loss) Income

Other Comprehensive (Loss) Income

The following table summarizes the components of other comprehensive (loss) income:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Unrealized (losses) gains arising during the period, before U.S. income taxes	$	(6,633	)	$	7,853		$	(25,925	)	$	13,851
U.S. income taxes	155			(1,156		)	699			(2,792		)
Unrealized (losses) gains arising during the period, net of U.S. income taxes	(6,478		)	6,697			(25,226		)	11,059
Less reclassification adjustment:
Net realized investment losses (gains)	108			(12		)	(93		)	438
U.S. income tax expenses	(28		)	1			(28		)	(121		)
Reclassification adjustment for investment losses (gains) realized in net income	80			(11		)	(121		)	317
Other comprehensive (loss) income	$	(6,558	)	$	6,708		$	(25,105	)	$	10,742

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Contingent Liabilities

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Contingent Liabilities

Contingent Liabilities

The Company is a party to various lawsuits arising in the ordinary course of its operations. The Company believes that the ultimate resolution of these matters will not materially impact its financial position, cash flows, or results of operations.

The Company’s reinsurance subsidiary, JRG Re, has entered into three letter of credit facilities with banks as security to third-party reinsureds on reinsurance assumed by JRG Re. JRG Re has established custodial accounts to secure these letters of credit. Under a $100.0 million facility, $45.5 million of letters of credit were issued through June 30, 2018 which were secured by deposits of $59.0 million. Under a $102.5 million facility, $100.2 million of letters of credit were issued through June 30, 2018 which were secured by deposits of $126.3 million. Under a $100.0 million facility, $6.9 million of letters of credit were issued through June 30, 2018 which were secured by deposits of $10.0 million. JRG Re has also established trust accounts to secure its obligations to selected reinsureds. The total amount deposited in the trust accounts for the benefit of third-party reinsureds was $271.8 million at June 30, 2018.

The Company is also exposed to credit risk relating to a set of insurance contracts with an insured group of companies under which the Company pays losses and loss adjustment expenses on the contract. The Company has indemnity agreements with this group of insured parties (non-insurance entities) and is contractually entitled to receive reimbursement for a significant portion of the losses and loss adjustment expenses paid on behalf of the insured parties and other expenses incurred by the Company. The insured parties are required to collateralize all amounts currently due to the Company and to provide additional collateral sufficient to cover the amounts that may be recoverable under the indemnity agreement, including among other things case loss and loss adjustment expense reserves, IBNR loss and loss adjustment expense reserves, extra contractual obligations and excess of policy limits liabilities. This collateral is currently provided through a collateral trust arrangement established in favor of the Company by a captive insurance company affiliate of the insured group. At June 30, 2018, the cash equivalent collateral held in the collateral trust arrangement was approximately $944.8 million, which exceeds the amount of claims receivable and unpaid reported losses and loss adjustment expenses outstanding. This is a rapidly growing relationship, and as such, there is ongoing exposure to estimated losses and expenses on these contracts growing at a faster pace than growth in our collateral balances. In addition, we have credit exposure if our estimates of future losses and loss adjustment expenses and other amounts recoverable, which are the basis for establishing collateral balances, are lower than actual amounts paid or payable. The amount of our credit exposure in any of these instances could be material. To mitigate these risks, we closely and frequently monitor our exposure compared to our collateral held, and we request additional collateral when our analysis indicates that we have uncollateralized exposure.

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Segment Information

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company has four reportable segments: the Excess and Surplus Lines segment, the Specialty Admitted Insurance segment, the Casualty Reinsurance segment, and the Corporate and Other segment. Segment profit (loss) is measured by underwriting profit (loss), which is generally defined as net earned premiums less loss and loss adjustment expenses and other operating expenses of the operating segments. Gross fee income of the Excess and Surplus Lines segment is included in that segment’s underwriting profit. Gross fee income of $3.7 million and $4.2 million was included in underwriting profit for the three months ended June 30, 2018 and 2017, respectively. For the six months ended June 30, 2018 and 2017, gross fee income of $8.5 million and $8.1 million, respectively, was included in underwriting profit. Segment results are reported prior to the effects of intercompany reinsurance agreements among the Company’s insurance subsidiaries.

The following table summarizes the Company’s segment results:

	Excess and Surplus Lines		Specialty Admitted Insurance		Casualty Reinsurance			Corporate and Other		Total
	(in thousands)
Three Months Ended June 30, 2018
Gross written premiums	$	165,398	$	97,100	$	30,880		$	—	$	293,378
Net earned premiums	139,127		14,266		54,817			—		208,210
Underwriting profit of insurance segments	10,117		988		1,729			—		12,834
Net investment income	4,350		839		9,662			1,284		16,135
Interest expense	—		—		—			2,946		2,946
Segment revenues	147,012		15,436		64,254			1,339		228,041
Segment goodwill	181,831		—		—			—		181,831
Segment assets	907,314		566,196		1,378,305			85,561		2,937,376
Three Months Ended June 30, 2017
Gross written premiums	$	138,004	$	76,771	$	66,700		$	—	$	281,475
Net earned premiums	117,268		17,760		49,049			—		184,077
Underwriting profit (loss) of insurance segments	11,729		553		(2,023		)	—		10,259
Net investment income	3,841		631		7,386			1,856		13,714
Interest expense	—		—		—			2,224		2,224
Segment revenues	125,484		18,435		56,574			1,901		202,394
Segment goodwill	181,831		—		—			—		181,831
Segment assets	779,428		369,515		1,268,560			114,550		2,532,053
Six Months Ended June 30, 2018
Gross written premiums	$	332,884	$	184,501	$	74,109		$	—	$	591,494
Net earned premiums	269,098		27,606		112,448			—		409,152
Underwriting profit of insurance segments	21,416		2,611		3,473			—		27,500
Net investment income	7,392		1,550		17,679			2,770		29,391
Interest expense	—		—		—			5,468		5,468
Segment revenues	284,339		29,391		129,780			2,875		446,385
Segment goodwill	181,831		—		—			—		181,831
Segment assets	907,314		566,196		1,378,305			85,561		2,937,376
Six Months Ended June 30, 2017
Gross written premiums	$	246,999	$	149,235	$	109,420		$	—	$	505,654
Net earned premiums	211,117		34,013		93,634			—		338,764
Underwriting profit (loss) of insurance segments	20,529		1,395		(930		)	—		20,994
Net investment income	7,024		1,267		14,510			7,646		30,447
Interest expense	—		—		—			4,347		4,347
Segment revenues	226,574		35,359		108,720			8,143		378,796
Segment goodwill	181,831		—		—			—		181,831
Segment assets	779,428		369,515		1,268,560			114,550		2,532,053

The following table reconciles the underwriting profit (loss) of the operating segments by individual segment to consolidated income before taxes:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Underwriting profit of the insurance segments:
Excess and Surplus Lines	$	10,117		$	11,729		$	21,416		$	20,529
Specialty Admitted Insurance	988			553			2,611			1,395
Casualty Reinsurance	1,729			(2,023		)	3,473			(930		)
Total underwriting profit of insurance segments	12,834			10,259			27,500			20,994
Other operating expenses of the Corporate and Other segment	(7,307		)	(6,095		)	(14,738		)	(12,556		)
Underwriting profit	5,527			4,164			12,762			8,438
Net investment income	16,135			13,714			29,391			30,447
Net realized investment (losses) gains	(64		)	307			(874		)	1,354
Amortization of intangible assets	(149		)	(149		)	(298		)	(298		)
Other income and expenses	4			(257		)	108			(57		)
Interest expense	(2,946		)	(2,224		)	(5,468		)	(4,347		)
Income before taxes	$	18,507		$	15,555		$	35,621		$	35,537

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Other Operating Expenses and Other Expenses

6 Months Ended

Jun. 30, 2018

Other Operating Expenses And Other Expenses [Abstract]

Other Operating Expenses and Other Expenses

Other Operating Expenses and Other Expenses

Other operating expenses consist of the following:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(in thousands)
Amortization of policy acquisition costs	$	28,672	$	31,614	$	58,870	$	59,252
Other underwriting expenses of the operating segments	15,772		15,327		32,926		30,121
Other operating expenses of the Corporate and Other segment	7,307		6,095		14,738		12,556
Total	$	51,751	$	53,036	$	106,534	$	101,929

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Fair Value Measurements

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Three levels of inputs are used to measure fair value of financial instruments: (1) Level 1: quoted price (unadjusted) in active markets for identical assets, (2) Level 2: inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the instrument, and (3) Level 3: inputs to the valuation methodology are unobservable for the asset or liability.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date.

To measure fair value, the Company obtains quoted market prices for its investment securities from its outside investment managers. If a quoted market price is not available, the Company uses prices of similar securities. Values for U.S. Treasury and publicly-traded equity securities are generally based on Level 1 inputs which use the market approach valuation technique. The values for all other fixed maturity securities (including state and municipal securities and obligations of U.S. government corporations and agencies) generally incorporate significant Level 2 inputs, and in some cases, Level 3 inputs, using the market approach and income approach valuation techniques. There have been no changes in the Company’s use of valuation techniques since December 31, 2016.

The Company reviews fair value prices provided by its outside investment managers for reasonableness by comparing the fair values provided by the managers to those provided by its investment custodian. The Company also reviews and monitors changes in unrealized gains and losses. The Company has not historically adjusted security prices. The Company obtains an understanding of the methods, models and inputs used by the investment managers and independent pricing services, and controls are in place to validate that prices provided represent fair values. The Company’s control process includes, but is not limited to, initial and ongoing evaluation of the methodologies used, a review of specific securities and an assessment for proper classification within the fair value hierarchy, and obtaining and reviewing internal control reports for our investment manager that obtains fair values from independent pricing services.

 Assets measured at fair value on a recurring basis as of June 30, 2018 are summarized below:

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	(in thousands)
Available-for-sale securities:
Fixed maturity securities:
State and municipal	$	—	$	138,373	$	—	$	138,373
Residential mortgage-backed	—		184,751		—		184,751
Corporate	—		430,345		—		430,345
Commercial mortgage and asset-backed	—		169,762		4,680		174,442
Obligations of U.S. government corporations and agencies	—		5,689		—		5,689
U.S. Treasury securities and obligations guaranteed by the U.S. government	85,227		570		—		85,797
Redeemable preferred stock	—		1,990		—		1,990
Total fixed maturity securities	85,227		931,480		4,680		1,021,387
Equity securities:
Preferred stock	—		64,866		—		64,866
Common stock	15,311		3,832		—		19,143
Total equity securities	15,311		68,698		—		84,009
Total available-for-sale securities	$	100,538	$	1,000,178	$	4,680	$	1,105,396
Trading securities:
Fixed maturity securities	$	—	$	—	$	—	$	—
Short-term investments	$	1,000	$	24,140	$	—	$	25,140

Assets measured at fair value on a recurring basis as of December 31, 2017 are summarized below:

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	(in thousands)
Available-for-sale securities:
Fixed maturity securities:
State and municipal	$	—	$	144,366	$	—	$	144,366
Residential mortgage-backed	—		158,661		—		158,661
Corporate	—		413,721		—		413,721
Commercial mortgage and asset-backed	—		177,931		4,680		182,611
Obligations of U.S. government corporations and agencies	—		35,847		—		35,847
U.S. Treasury securities and obligations guaranteed by the U.S. government	78,265		609		—		78,874
Redeemable preferred stock	—		2,018		—		2,018
Total fixed maturity securities	78,265		933,153		4,680		1,016,098
Equity securities:
Preferred stock	—		66,281		—		66,281
Common stock	15,507		734		—		16,241
Total equity securities	15,507		67,015		—		82,522
Total available-for-sale securities	$	93,772	$	1,000,168	$	4,680	$	1,098,620
Trading securities:
Fixed maturity securities	$	—	$	3,808	$	—	$	3,808
Short-term investments	$	1,000	$	35,804	$	—	$	36,804

The beginning and ending balances of assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of one available-for-sale fixed maturity security with a fair value of $4.7 million, and there was no activity (purchases, sales, transfers) involving Level 3 securities for the six months ended June 30, 2018 and 2017. A market approach using prices in trades of comparable securities was utilized to determine the fair value for this security at June 30, 2018 and December 31, 2017.

Transfers out of Level 3 occur when the Company is able to obtain reliable prices from pricing vendors for securities for which the Company was previously unable to obtain reliable prices. Transfers in to Level 3 occur when the Company is unable to obtain reliable prices for securities from pricing vendors and instead must use broker price quotes to value the securities.

There were no transfers between Level 1 and Level 2 during the six months ended June 30, 2018 or 2017. The Company recognizes transfers between levels at the beginning of the reporting period.

There were no realized gains or losses included in earnings for the six months ended June 30, 2018 attributable to the change in unrealized gains or losses relating to Level 3 assets valued at fair value on a recurring basis that are still held at June 30, 2018.

The Company measures certain bank loan participations at fair value on a non-recurring basis during the year as part of the Company’s impairment evaluation when loans are determined by management to be impaired.

Assets measured at fair value on a nonrecurring basis are summarized below:

	Fair Value Measurements Using
	Quoted Prices In Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	(in thousands)
June 30, 2018
Bank loan participations held-for-investment	$	—	$	—	$	2,243	$	2,243
December 31, 2017
Bank loan participations held-for-investment	$	—	$	—	$	5,111	$	5,111

Bank loan participations held-for-investment that were determined to be impaired were written down to their fair value of $2.2 million at June 30, 2018 and $5.1 million at December 31, 2017.

In the determination of the fair value for bank loan participations and certain high yield bonds, the Company’s investment manager endeavors to obtain data from multiple external pricing sources. External pricing sources may include brokers, dealers and price data vendors that provide a composite price based on prices from multiple dealers. Such external pricing sources typically provide valuations for normal institutional size trading units of such securities using methods based on market transactions for comparable securities, and various relationships between securities, as generally recognized by institutional dealers. For investments in which the investment manager determines that only one external pricing source is appropriate or if only one external price is available, the relevant investment is generally recorded at fair value based on such price.

Investments for which external sources are not available or are determined by the investment manager not to be representative of fair value are recorded at fair value as determined by the Company, with input from its investment managers and valuation specialists as considered necessary. In determining the fair value of such investments, the Company considers one or more of the following factors: type of security held, convertibility or exchangeability of the security, redeemability of the security (including the timing of redemptions), application of industry accepted valuation models, recent trading activity, liquidity, estimates of liquidation value, purchase cost, and prices received for securities with similar terms of the same issuer or similar issuers. At June 30, 2018, there were no investments for which external sources were unavailable to determine fair value. At December 31, 2017, there was one bank loan participation with an unpaid principal balance of $807,000 and a carrying value of zero for which external sources were unavailable to determine fair value.

The carrying values and fair values of financial instruments are summarized below:

	June 30, 2018				December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Assets
Available-for-sale:
Fixed maturity securities	$	1,021,387	$	1,021,387	$	1,016,098	$	1,016,098
Equity securities	84,009		84,009		82,522		82,522
Trading:
Fixed maturity securities	—		—		3,808		3,808
Bank loan participations held-for-investment	253,689		252,836		238,214		236,532
Cash and cash equivalents	267,367		267,367		163,495		163,495
Short-term investments	25,140		25,140		36,804		36,804
Other invested assets – notes receivable	13,250		18,880		11,778		17,104
Liabilities
Senior debt	98,300		97,960		98,300		97,884
Junior subordinated debt	104,055		115,472		104,055		116,569

The fair values of fixed maturity securities and equity securities have been determined using quoted market prices for securities traded in the public market or prices using bid or closing prices for securities not traded in the public marketplace. The fair values of cash and cash equivalents and short-term investments approximate their carrying values due to their short-term maturity.

The fair values of other invested assets-notes receivable, senior debt, and junior subordinated debt at June 30, 2018 and December 31, 2017 were determined by calculating the present value of expected future cash flows under the terms of the note agreements or debt agreements, as applicable, discounted at an estimated market rate of interest at June 30, 2018 and December 31, 2017, respectively.

The fair values of bank loan participations held-for-investment, senior debt, and junior subordinated debt at June 30, 2018 and December 31, 2017 were determined using inputs to the valuation methodology that are unobservable (Level 3).

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Capital Stock and Equity Awards

6 Months Ended

Jun. 30, 2018

Stockholders' Equity Note [Abstract]

Capital Stock and Equity Awards

Capital Stock and Equity Awards

The Company issued 221,139 common shares in the six months ended June 30, 2018 with 177,835 new shares related to stock option exercises and 43,304 new shares related to vesting of RSUs. The total common shares outstanding increased from 29,696,682 at December 31, 2017 to 29,917,821 at June 30, 2018.

The Company declared the following dividends during the first six months of 2018 and 2017:

Date of Declaration	Dividend per Common Share		Payable to Shareholders of Record on	Payment Date	Total Amount
2018
February 22, 2018	$	0.30	March 12, 2018	March 30, 2018	$	9.0	million
May 1, 2018	$	0.30	June 11, 2018	June 29, 2018	$	9.1	million
	$	0.60			$	18.1	million
2017
February 14, 2017	$	0.30	March 13, 2017	March 31, 2017	$	8.9	million
May 2, 2017	$	0.30	June 12, 2017	June 30, 2017	$	8.9	million
	$	0.60			$	17.8	million

Included in the total dividends for the six months ended June 30, 2018 and 2017 are $197,000 and $154,000 of dividend equivalents on RSUs, respectively. The balance of dividends payable was $500,870 at June 30, 2018 and $434,000 at December 31, 2017.

Equity Incentive Plans

The Company’s shareholders have approved various equity incentive plans, including the Amended and Restated 2009 Equity Incentive Plan (the “Legacy Plan”), the 2014 Long Term Incentive Plan (“2014 LTIP”), and the 2014 Non-Employee Director Incentive Plan (“2014 Director Plan”) (collectively, the “Plans”). All awards issued under the Plans are issued at the discretion of the Board of Directors. Under the Legacy Plan, employees received non-qualified stock options. Options are outstanding under the Legacy Plan; however, no additional awards may be granted.

Employees are eligible to receive non-qualified stock options, incentive stock options, share appreciation rights, performance shares, restricted shares, RSUs, and other awards under the 2014 LTIP. The maximum number of shares available for issuance under the 2014 LTIP is 4,171,150, and at June 30, 2018, 1,692,615 shares are available for grant.

Non-employee directors of the Company are eligible to receive non-qualified stock options, share appreciation rights, performance shares, restricted shares, RSUs, and other awards under the 2014 Director Plan. The maximum number of shares available for issuance under the 2014 Director Plan is 50,000, and at June 30, 2018, 21,663 shares are available for grant.

Generally, awards issued under the 2014 LTIP and 2014 Director Plan vest immediately in the event that an award recipient is terminated without Cause (as defined in the applicable plans), and in the case of the 2014 LTIP for Good Reason (as defined in the applicable plans), at any time following a Change in Control (as defined in the applicable plans).

Options

The following table summarizes the option activity for the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Outstanding:
Beginning of period	1,479,236		$	27.81	2,234,699		$	22.84
Granted	—		$	—	205,244		$	42.24
Exercised	(255,609	)	$	21.14	(443,114	)	$	18.72
Forfeited	(29,446	)	$	36.26	(50,062	)	$	27.97
End of period	1,194,181		$	29.04	1,946,767		$	25.69
Exercisable, end of period	876,816		$	26.59	992,395		$	20.95

All of the outstanding options vest over two to four years and have a contractual life of seven years from the original date of grant. All of the outstanding options have an exercise price greater than or equal to the fair value of the underlying shares at the date of grant. The weighted-average remaining contractual life of the options outstanding and options exercisable was 4.1 years and 3.8 years, respectively.

RSUs

The following table summarizes the RSU activity for the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted- Average Grant Date Fair Value		Shares		Weighted- Average Grant Date Fair Value
Unvested, beginning of period	178,882		$	37.93	196,800		$	24.38
Granted	214,907		$	39.81	119,312		$	42.19
Vested	(63,191	)	$	40.92	(39,113	)	$	32.01
Forfeited	(4,454	)	$	41.04	(19,743	)	$	24.06
Unvested, end of period	326,144		$	38.55	257,256		$	31.50

The vesting period of RSUs granted to employees range from one to five years and vest ratably over the respective vesting period, and the majority vest in three years. All RSUs granted to date to non-employee directors had a one year vesting period. The holders of RSUs are entitled to dividend equivalents. The dividend equivalents are settled in cash at the same time that the underlying RSUs vest and are subject to the same risk of forfeiture as the underlying shares. The fair value of the RSUs granted is based on the market price of the underlying shares.

Compensation Expense

Share based compensation expense is recognized on a straight line basis over the vesting period. The amount of expense and related tax benefit is summarized below:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(in thousands)
Share based compensation expense	$	1,660	$	1,784	$	3,115	$	3,578
U.S. tax benefit on share based compensation expense	198		477		371		946

As of June 30, 2018, the Company had $11.9 million of unrecognized share based compensation expense expected to be charged to earnings over a weighted-average period of 2.1 years.

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Subsequent Events

6 Months Ended

Jun. 30, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

On July 31, 2018, the Board of Directors declared a cash dividend of $0.30 per common share. The dividend is payable on September 28, 2018 to shareholders of record on September 10, 2018.

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Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements and notes have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and do not contain all of the information and footnotes required by U.S. GAAP for complete financial statements. The condensed consolidated financial statements include the results of the Company and its subsidiaries from their respective dates of inception or acquisition, as applicable. Readers are urged to review the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for a more complete description of the Company’s business and accounting policies. In the opinion of management, all adjustments necessary for a fair presentation of the condensed consolidated financial statements have been included. Such adjustments consist only of normal recurring items. Interim results are not necessarily indicative of results of operations for the full year. The consolidated balance sheet as of December 31, 2017 was derived from the Company’s audited annual consolidated financial statements.

Intercompany transactions and balances have been eliminated.

Estimates and Assumptions

Estimates and Assumptions

Preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying disclosures. Those estimates are inherently subject to change, and actual results may ultimately differ from those estimates.

Variable Interest Entities

Variable Interest Entities

Entities that do not have sufficient equity at risk to allow the entity to finance its activities without additional financial support or in which the equity investors, as a group, do not have the characteristic of a controlling financial interest are referred to as variable interest entities (“VIE”). A VIE is consolidated by the variable interest holder that is determined to have the controlling financial interest (primary beneficiary) as a result of having both the power to direct the activities of a VIE that most significantly impact the VIE’s economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE’s capital structure, contractual terms, nature of the VIE’s operations and purpose, and the Company’s relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE. The Company reassesses its VIE determination with respect to an entity on an ongoing basis.

The Company holds interests in VIEs through certain equity method investments included in “other invested assets” in the accompanying condensed consolidated balance sheets. The Company has determined that it should not consolidate any of the VIEs as it is not the primary beneficiary in any of the relationships. Although the investments resulted in the Company holding variable interests in the entities, they did not empower the Company to direct the activities that most significantly impact the economic performance of the entities.

Income Tax Expense

Income Tax Expense

Our effective tax rate fluctuates from period to period based on the relative mix of income reported by country and the respective tax rates imposed by each tax jurisdiction. For the three months ended June 30, 2018 and 2017, our U.S. federal income tax expense was 8.2% and 6.5% of income before taxes, respectively (8.4% and 7.2% for the six months ended June 30, 2018 and 2017, respectively). For U.S.-sourced income, the Company’s U.S. federal income tax expense differs from the amounts computed by applying the federal statutory income tax rate (21% in 2018 and 35% in 2017) to income before taxes due primarily to interest income on tax-advantaged state and municipal securities (state and municipal securities represent 12.5% and 12.3% of our available-for-sale securities at June 30, 2018 and 2017, respectively), dividends received income, and excess tax benefits on share based compensation.

Adopted Accounting Standards

Adopted Accounting Standards

Effective January 1, 2018, the Company adopted Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606). The guidance applies to all companies that either enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards, such as insurance contracts. Under this guidance, a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. Judgments required in adopting this update may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The adoption of ASU 2014-09 had no impact on reported fee income and there was no cumulative effect of initially applying the update.

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. Among other things, this ASU requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. Upon adoption on January 1, 2018, the Company made a $4.7 million cumulative-effect adjustment to increase retained earnings and reduce accumulated other comprehensive income. The adoption of ASU 2016-01 did not materially impact the Company's financial position, cash flows, or total comprehensive income. The Company's results of operations were impacted as changes in fair value of equity instruments are now presented in net income rather than other comprehensive (loss) income. For the three and six months ended June 30, 2018, the respective impact on net income was an increase of $451,000 ($0.02 and $0.01 increase in basic and diluted earnings per share, respectively) and a reduction of $922,000 ($0.03 reduction in basic and diluted earnings per share).

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. This update was issued as a result of the enactment of the Tax Act on December 22, 2017. The ASU allows for the option to reclassify the stranded tax effects resulting from the implementation of the Tax Act out of accumulated other comprehensive income and into retained earnings. As the adoption of ASU 2016-01 in 2018 resulted in the reclassification of the entire unrealized balance on equity securities from accumulated other comprehensive income into retained earnings, only the stranded tax effects on the unrealized balances of fixed income securities were impacted by the adoption of ASU 2018-02. The reclassification resulted in a $711,000 decrease to the Company's retained earnings with a corresponding increase to accumulated other comprehensive income in the first quarter of 2018.

Prospective Accounting Standards

Prospective Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). Under current guidance for lessees, leases are only included on the balance sheet if certain criteria, classifying the agreement as a capital lease, are met. This update will require the recognition of a right-of-use asset and a corresponding lease liability, discounted to the present value, for all leases that extend beyond 12 months. This ASU is effective for annual and interim reporting periods beginning after December 15, 2018. Upon adoption, leases will be recognized and measured at the beginning of the earliest period presented using a modified retrospective approach. The Company is currently evaluating ASU 2016-02 to determine the potential impact that adopting this standard will have on its financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. Current GAAP delays the recognition of credit losses until it is probable a loss has been incurred. The update will require financial assets measured at amortized cost, such as bank loan participations held for investment, to be presented at the net amount expected to be collected by means of an allowance for credit losses that runs through net income. Credit losses relating to available-for-sale debt securities will also be recorded through an allowance for credit losses, with the amount of the allowance limited to the amount by which fair value is below amortized cost. This ASU is effective for annual and interim reporting periods beginning after December 15, 2019. Upon adoption, this ASU will be applied using the modified-retrospective approach, by which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period presented. The Company has not yet completed the analysis of how adopting this ASU will affect the Company’s financial statements.

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Investments (Tables)

6 Months Ended

Jun. 30, 2018

Investments [Abstract]

Schedule of summary of available-for-sale investments

The Company’s available-for-sale investments are summarized as follows:

	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
June 30, 2018
Fixed maturity securities:
State and municipal	$	137,055	$	3,590	$	(2,272	)	$	138,373
Residential mortgage-backed	190,574		445		(6,268		)	184,751
Corporate	439,993		1,655		(11,303		)	430,345
Commercial mortgage and asset-backed	177,286		85		(2,929		)	174,442
Obligations of U.S. government corporations and agencies	5,702		—		(13		)	5,689
U.S. Treasury securities and obligations guaranteed by the U.S. government	87,143		26		(1,372		)	85,797
Redeemable preferred stock	2,025		—		(35		)	1,990
Total fixed maturity securities	1,039,778		5,801		(24,192		)	1,021,387
Equity securities	77,995		6,675		(661		)	84,009
Total investments available-for-sale	$	1,117,773	$	12,476	$	(24,853	)	$	1,105,396
December 31, 2017
Fixed maturity securities:
State and municipal	$	139,382	$	5,587	$	(603	)	$	144,366
Residential mortgage-backed	160,379		723		(2,441		)	158,661
Corporate	408,857		7,503		(2,639		)	413,721
Commercial mortgage and asset-backed	182,595		714		(698		)	182,611
Obligations of U.S. government corporations and agencies	35,948		—		(101		)	35,847
U.S. Treasury securities and obligations guaranteed by the U.S. government	79,476		37		(639		)	78,874
Redeemable preferred stock	2,025		—		(7		)	2,018
Total fixed maturity securities	1,008,662		14,564		(7,128		)	1,016,098
Equity securities	75,318		7,830		(626		)	82,522
Total investments available-for-sale	$	1,083,980	$	22,394	$	(7,754	)	$	1,098,620

Schedule of summary of available-for-sale investments by contractual maturity

The amortized cost and fair value of available-for-sale investments in fixed maturity securities at June 30, 2018 are summarized, by contractual maturity, as follows:

	Cost or Amortized Cost		Fair Value
	(in thousands)
One year or less	$	40,895	$	40,760
After one year through five years	317,761		312,999
After five years through ten years	193,545		187,368
After ten years	117,692		119,077
Residential mortgage-backed	190,574		184,751
Commercial mortgage and asset-backed	177,286		174,442
Redeemable preferred stock	2,025		1,990
Total	$	1,039,778	$	1,021,387

Schedule of gross unrealized losses and fair value for available-for-sale securities

The following table shows the Company’s gross unrealized losses and fair value for available-for-sale securities aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position:

	Less Than 12 Months					12 Months or More					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in thousands)
June 30, 2018
Fixed maturity securities:
State and municipal	$	62,247	$	(1,800	)	$	10,402	$	(472	)	$	72,649	$	(2,272	)
Residential mortgage-backed	91,518		(2,123		)	76,384		(4,145		)	167,902		(6,268		)
Corporate	292,519		(7,730		)	57,914		(3,573		)	350,433		(11,303		)
Commercial mortgage and asset-backed	112,250		(2,194		)	20,388		(735		)	132,638		(2,929		)
Obligations of U.S. government corporations and agencies	—		—			5,689		(13		)	5,689		(13		)
U.S. Treasury securities and obligations guaranteed by the U.S. government	70,158		(1,115		)	13,397		(257		)	83,555		(1,372		)
Redeemable preferred stock	1,990		(35		)	—		—			1,990		(35		)
Total fixed maturity securities	630,682		(14,997		)	184,174		(9,195		)	814,856		(24,192		)
Equity securities	10,128		(262		)	5,627		(399		)	15,755		(661		)
Total investments available-for-sale	$	640,810	$	(15,259	)	$	189,801	$	(9,594	)	$	830,611	$	(24,853	)
December 31, 2017
Fixed maturity securities:
State and municipal	$	40,117	$	(318	)	$	10,662	$	(285	)	$	50,779	$	(603	)
Residential mortgage-backed	50,447		(261		)	84,193		(2,180		)	134,640		(2,441		)
Corporate	113,464		(846		)	66,954		(1,793		)	180,418		(2,639		)
Commercial mortgage and asset-backed	53,965		(244		)	25,299		(454		)	79,264		(698		)
Obligations of U.S. government corporations and agencies	3,024		(1		)	32,154		(100		)	35,178		(101		)
U.S. Treasury securities and obligations guaranteed by the U.S. government	50,760		(430		)	26,707		(209		)	77,467		(639		)
Redeemable preferred stock	2,018		(7		)	—		—			2,018		(7		)
Total fixed maturity securities	313,795		(2,107		)	245,969		(5,021		)	559,764		(7,128		)
Equity securities	5,859		(65		)	5,665		(561		)	11,524		(626		)
Total investments available-for-sale	$	319,654	$	(2,172	)	$	251,634	$	(5,582	)	$	571,288	$	(7,754	)

Schedule of summary of realized gains and losses

The Company’s net realized and unrealized gains and losses on investments are summarized as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Fixed maturity securities:
Gross realized gains	$	360		$	18		$	382		$	356
Gross realized losses	(252		)	(31		)	(475		)	(327		)
	108			(13		)	(93		)	29
Bank loan participations:
Gross realized gains	360			471			1,580			1,607
Gross realized losses	(1,006		)	(150		)	(1,106		)	(689		)
	(646		)	321			474			918
Equity securities:
Gross realized gains	—			—			—			409
Gross realized losses	(47		)	—			(62		)	—
Changes in fair values of equity securities	521			—			(1,189		)	—
	474			—			(1,251		)	409
Short-term investments and other:
Gross realized gains	—			—			—			—
Gross realized losses	—			(1		)	(4		)	(2		)
	—			(1		)	(4		)	(2		)
Total	$	(64	)	$	307		$	(874	)	$	1,354

Schedule of other invested assets

The Company invests selectively in private debt and equity opportunities. These investments, which together comprise the Company’s other invested assets, are primarily focused in renewable energy, limited partnerships, and bank holding companies.

	Carrying Value				Investment Income
	June 30,		December 31,		Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017		2018		2017
	(in thousands)
Renewable energy LLCs (a)	$	32,204	$	32,063	$	530	$	1,521	$	1,741	$	7,115
Renewable energy notes receivable (b)	8,750		7,278		328		49		625		49
Limited partnerships (c)	31,359		26,367		1,092		703		1,319		1,085
Bank holding companies (d)	4,500		4,500		86		86		172		172
Total other invested assets	$	76,813	$	70,208	$	2,036	$	2,359	$	3,857	$	8,421

(a) The Company’s Corporate and Other segment owns equity interests ranging from 2.6% to 32.8% in various LLCs whose principal objective is capital appreciation and income generation from owning and operating renewable energy production facilities (wind and solar). The LLCs are managed by an affiliate of the Company and the Company’s Non-Executive Chairman has invested in certain of these LLCs. The equity method is used to account for the Company’s LLC investments. Income for the LLCs primarily reflects adjustments to the carrying values of investments in renewable energy projects to their determined fair values. The fair value adjustments are included in revenues for the LLCs. Expenses for the LLCs are not significant and are comprised of administrative and interest expenses. The Company received cash distributions from these investments totaling $2.1 million and $3.6 million in the six months ended June 30, 2018 and 2017, respectively.

(b) The Company has invested in notes receivable for renewable energy projects. At June 30, 2018, the Company holds an $8.8 million note issued by an affiliate of the Company. Interest on the note, which matures in 2021, is fixed at 15.0%. Interest income on the note was $328,000 and $625,000 for the three and six months ended June 30, 2018, respectively ($49,000 for the three and six months ended June 30, 2017).

(c) The Company owns investments in limited partnerships that invest in concentrated portfolios including publicly-traded small cap equities, loans of middle market private equity sponsored companies, equity tranches of collateralized loan obligations (“CLOs”), and tranches of distressed home loans. Income from the partnerships is recognized under the equity method of accounting. The Company’s Corporate and Other segment held an investment in a limited partnership with a carrying value of $3.2 million at June 30, 2018. The Company recognized investment income of $333,000 and $208,000 on the investment for the three and six months ended June 30, 2018, respectively ($152,000 and $220,000for the three and six months ended June 30, 2017, respectively). The Company’s Excess and Surplus Lines segment holds investments in limited partnerships of $28.1 million at June 30, 2018. Investment income of $759,000 and $1.1 million was recognized on the investments for the three and six months ended June 30, 2018, respectively ($551,000 and $865,000for the three and six months ended June 30, 2017, respectively). At June 30, 2018, the Company’s Excess and Surplus Lines segment has outstanding commitments to invest another $625,000 in these limited partnerships.

(d) The Company holds $4.5 million of subordinated notes issued by a bank holding company. Interest on the notes, which mature on August 12, 2023, is fixed at 7.6% per annum. Interest income on the notes was $86,000 and $172,000, respectively, in both the three and six months ended June 30, 2018 and 2017. The Company’s Non-Executive Chairman was previously the Lead Independent Director of the bank holding company and an investor in the bank holding company. Additionally, one of the Company’s directors was an investor in the bank holding company and is currently a lender to the bank holding company.

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Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of gross carrying amounts and accumulated amortization

The gross carrying amounts and accumulated amortization for each major specifically identifiable intangible asset class were as follows: 

		June 30, 2018				December 31, 2017
	Life (Years)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
		($ in thousands)
Intangible Assets
Trademarks	Indefinite	$	22,200	$	—	$	22,200	$	—
Insurance licenses and authorities	Indefinite	9,164		—		9,164		—
Identifiable intangibles not subject to amortization		31,364		—		31,364		—
Broker relationships	24.6	11,611		4,939		11,611		4,641
Identifiable intangible assets subject to amortization		11,611		4,939		11,611		4,641
		$	42,975	$	4,939	$	42,975	$	4,641

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of reconciliation of numerator and denominator of basic and diluted earnings per share

The following represents a reconciliation of the numerator and denominator of the basic and diluted earnings per share computations contained in the condensed consolidated financial statements:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands, except share and per share amounts)
Net income to shareholders	$	16,984		$	14,541		$	32,617		$	32,991
Weighted average common shares outstanding:
Basic	29,882,988			29,406,877			29,823,982			29,348,557
Common share equivalents	410,945			900,222			419,964			969,028
Diluted	30,293,933			30,307,099			30,243,946			30,317,585
Earnings per share:
Basic	$	0.57		$	0.49		$	1.09		$	1.12
Common share equivalents	(0.01		)	(0.01		)	(0.01		)	(0.03		)
Diluted	$	0.56		$	0.48		$	1.08		$	1.09

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Reserve for Losses and Loss Adjustment Expenses (Tables)

6 Months Ended

Jun. 30, 2018

Liability for Claims and Claims Adjustment Expense [Abstract]

Schedule of reconciliation of beginning and ending reserve balances for losses and loss adjustment expenses

The following table provides a reconciliation of the beginning and ending reserve balances for losses and loss adjustment expenses, net of reinsurance, to the gross amounts reported in the condensed consolidated balance sheets:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018			2017
	(in thousands)
Reserve for losses and loss adjustment expenses net of reinsurance recoverables at beginning of period	$	1,038,303	$	791,781	$	989,825		$	761,128
Add: Incurred losses and loss adjustment expenses net of reinsurance:
Current year	152,371		129,369		298,753			238,152
Prior years	2,224		1,715		(386		)	(1,699		)
Total incurred losses and loss and adjustment expenses	154,595		131,084		298,367			236,453
Deduct: Loss and loss adjustment expense payments net of reinsurance:
Current year	20,577		13,908		32,754			17,606
Prior years	79,503		69,449		162,620			140,467
Total loss and loss adjustment expense payments	100,080		83,357		195,374			158,073
Reserve for losses and loss adjustment expenses net of reinsurance recoverables at end of period	1,092,818		839,508		1,092,818			839,508
Add: Reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period	375,535		221,553		375,535			221,553
Reserve for losses and loss adjustment expenses gross of reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period	$	1,468,353	$	1,061,061	$	1,468,353		$	1,061,061

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Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2018

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of components of comprehensive income (loss)

The following table summarizes the components of other comprehensive (loss) income:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Unrealized (losses) gains arising during the period, before U.S. income taxes	$	(6,633	)	$	7,853		$	(25,925	)	$	13,851
U.S. income taxes	155			(1,156		)	699			(2,792		)
Unrealized (losses) gains arising during the period, net of U.S. income taxes	(6,478		)	6,697			(25,226		)	11,059
Less reclassification adjustment:
Net realized investment losses (gains)	108			(12		)	(93		)	438
U.S. income tax expenses	(28		)	1			(28		)	(121		)
Reclassification adjustment for investment losses (gains) realized in net income	80			(11		)	(121		)	317
Other comprehensive (loss) income	$	(6,558	)	$	6,708		$	(25,105	)	$	10,742

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Schedule of summary of company's segment results

The following table summarizes the Company’s segment results:

	Excess and Surplus Lines		Specialty Admitted Insurance		Casualty Reinsurance			Corporate and Other		Total
	(in thousands)
Three Months Ended June 30, 2018
Gross written premiums	$	165,398	$	97,100	$	30,880		$	—	$	293,378
Net earned premiums	139,127		14,266		54,817			—		208,210
Underwriting profit of insurance segments	10,117		988		1,729			—		12,834
Net investment income	4,350		839		9,662			1,284		16,135
Interest expense	—		—		—			2,946		2,946
Segment revenues	147,012		15,436		64,254			1,339		228,041
Segment goodwill	181,831		—		—			—		181,831
Segment assets	907,314		566,196		1,378,305			85,561		2,937,376
Three Months Ended June 30, 2017
Gross written premiums	$	138,004	$	76,771	$	66,700		$	—	$	281,475
Net earned premiums	117,268		17,760		49,049			—		184,077
Underwriting profit (loss) of insurance segments	11,729		553		(2,023		)	—		10,259
Net investment income	3,841		631		7,386			1,856		13,714
Interest expense	—		—		—			2,224		2,224
Segment revenues	125,484		18,435		56,574			1,901		202,394
Segment goodwill	181,831		—		—			—		181,831
Segment assets	779,428		369,515		1,268,560			114,550		2,532,053
Six Months Ended June 30, 2018
Gross written premiums	$	332,884	$	184,501	$	74,109		$	—	$	591,494
Net earned premiums	269,098		27,606		112,448			—		409,152
Underwriting profit of insurance segments	21,416		2,611		3,473			—		27,500
Net investment income	7,392		1,550		17,679			2,770		29,391
Interest expense	—		—		—			5,468		5,468
Segment revenues	284,339		29,391		129,780			2,875		446,385
Segment goodwill	181,831		—		—			—		181,831
Segment assets	907,314		566,196		1,378,305			85,561		2,937,376
Six Months Ended June 30, 2017
Gross written premiums	$	246,999	$	149,235	$	109,420		$	—	$	505,654
Net earned premiums	211,117		34,013		93,634			—		338,764
Underwriting profit (loss) of insurance segments	20,529		1,395		(930		)	—		20,994
Net investment income	7,024		1,267		14,510			7,646		30,447
Interest expense	—		—		—			4,347		4,347
Segment revenues	226,574		35,359		108,720			8,143		378,796
Segment goodwill	181,831		—		—			—		181,831
Segment assets	779,428		369,515		1,268,560			114,550		2,532,053

Schedule of underwriting profit of operating segments by individual segment and reconciliation to consolidated income before taxes

The following table reconciles the underwriting profit (loss) of the operating segments by individual segment to consolidated income before taxes:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Underwriting profit of the insurance segments:
Excess and Surplus Lines	$	10,117		$	11,729		$	21,416		$	20,529
Specialty Admitted Insurance	988			553			2,611			1,395
Casualty Reinsurance	1,729			(2,023		)	3,473			(930		)
Total underwriting profit of insurance segments	12,834			10,259			27,500			20,994
Other operating expenses of the Corporate and Other segment	(7,307		)	(6,095		)	(14,738		)	(12,556		)
Underwriting profit	5,527			4,164			12,762			8,438
Net investment income	16,135			13,714			29,391			30,447
Net realized investment (losses) gains	(64		)	307			(874		)	1,354
Amortization of intangible assets	(149		)	(149		)	(298		)	(298		)
Other income and expenses	4			(257		)	108			(57		)
Interest expense	(2,946		)	(2,224		)	(5,468		)	(4,347		)
Income before taxes	$	18,507		$	15,555		$	35,621		$	35,537

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Other Operating Expenses and Other Expenses (Tables)

6 Months Ended

Jun. 30, 2018

Other Operating Expenses And Other Expenses [Abstract]

Schedule of other operating expenses

Other operating expenses consist of the following:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(in thousands)
Amortization of policy acquisition costs	$	28,672	$	31,614	$	58,870	$	59,252
Other underwriting expenses of the operating segments	15,772		15,327		32,926		30,121
Other operating expenses of the Corporate and Other segment	7,307		6,095		14,738		12,556
Total	$	51,751	$	53,036	$	106,534	$	101,929

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of assets measured at fair value on a recurring basis

Assets measured at fair value on a recurring basis as of June 30, 2018 are summarized below:

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	(in thousands)
Available-for-sale securities:
Fixed maturity securities:
State and municipal	$	—	$	138,373	$	—	$	138,373
Residential mortgage-backed	—		184,751		—		184,751
Corporate	—		430,345		—		430,345
Commercial mortgage and asset-backed	—		169,762		4,680		174,442
Obligations of U.S. government corporations and agencies	—		5,689		—		5,689
U.S. Treasury securities and obligations guaranteed by the U.S. government	85,227		570		—		85,797
Redeemable preferred stock	—		1,990		—		1,990
Total fixed maturity securities	85,227		931,480		4,680		1,021,387
Equity securities:
Preferred stock	—		64,866		—		64,866
Common stock	15,311		3,832		—		19,143
Total equity securities	15,311		68,698		—		84,009
Total available-for-sale securities	$	100,538	$	1,000,178	$	4,680	$	1,105,396
Trading securities:
Fixed maturity securities	$	—	$	—	$	—	$	—
Short-term investments	$	1,000	$	24,140	$	—	$	25,140

Assets measured at fair value on a recurring basis as of December 31, 2017 are summarized below:

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	(in thousands)
Available-for-sale securities:
Fixed maturity securities:
State and municipal	$	—	$	144,366	$	—	$	144,366
Residential mortgage-backed	—		158,661		—		158,661
Corporate	—		413,721		—		413,721
Commercial mortgage and asset-backed	—		177,931		4,680		182,611
Obligations of U.S. government corporations and agencies	—		35,847		—		35,847
U.S. Treasury securities and obligations guaranteed by the U.S. government	78,265		609		—		78,874
Redeemable preferred stock	—		2,018		—		2,018
Total fixed maturity securities	78,265		933,153		4,680		1,016,098
Equity securities:
Preferred stock	—		66,281		—		66,281
Common stock	15,507		734		—		16,241
Total equity securities	15,507		67,015		—		82,522
Total available-for-sale securities	$	93,772	$	1,000,168	$	4,680	$	1,098,620
Trading securities:
Fixed maturity securities	$	—	$	3,808	$	—	$	3,808
Short-term investments	$	1,000	$	35,804	$	—	$	36,804

Schedule of assets measured at fair value on a nonrecurring basis

Assets measured at fair value on a nonrecurring basis are summarized below:

	Fair Value Measurements Using
	Quoted Prices In Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
	(in thousands)
June 30, 2018
Bank loan participations held-for-investment	$	—	$	—	$	2,243	$	2,243
December 31, 2017
Bank loan participations held-for-investment	$	—	$	—	$	5,111	$	5,111

Schedule of carrying value and fair value

The carrying values and fair values of financial instruments are summarized below:

	June 30, 2018				December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Assets
Available-for-sale:
Fixed maturity securities	$	1,021,387	$	1,021,387	$	1,016,098	$	1,016,098
Equity securities	84,009		84,009		82,522		82,522
Trading:
Fixed maturity securities	—		—		3,808		3,808
Bank loan participations held-for-investment	253,689		252,836		238,214		236,532
Cash and cash equivalents	267,367		267,367		163,495		163,495
Short-term investments	25,140		25,140		36,804		36,804
Other invested assets – notes receivable	13,250		18,880		11,778		17,104
Liabilities
Senior debt	98,300		97,960		98,300		97,884
Junior subordinated debt	104,055		115,472		104,055		116,569

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Capital Stock and Equity Awards (Tables)

6 Months Ended

Jun. 30, 2018

Stockholders' Equity Note [Abstract]

Schedule of dividends

The Company declared the following dividends during the first six months of 2018 and 2017:

Date of Declaration	Dividend per Common Share		Payable to Shareholders of Record on	Payment Date	Total Amount
2018
February 22, 2018	$	0.30	March 12, 2018	March 30, 2018	$	9.0	million
May 1, 2018	$	0.30	June 11, 2018	June 29, 2018	$	9.1	million
	$	0.60			$	18.1	million
2017
February 14, 2017	$	0.30	March 13, 2017	March 31, 2017	$	8.9	million
May 2, 2017	$	0.30	June 12, 2017	June 30, 2017	$	8.9	million
	$	0.60			$	17.8	million

Schedule of summary of option activity

The following table summarizes the option activity for the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Outstanding:
Beginning of period	1,479,236		$	27.81	2,234,699		$	22.84
Granted	—		$	—	205,244		$	42.24
Exercised	(255,609	)	$	21.14	(443,114	)	$	18.72
Forfeited	(29,446	)	$	36.26	(50,062	)	$	27.97
End of period	1,194,181		$	29.04	1,946,767		$	25.69
Exercisable, end of period	876,816		$	26.59	992,395		$	20.95

Schedule of summary of RSU activity

The following table summarizes the RSU activity for the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted- Average Grant Date Fair Value		Shares		Weighted- Average Grant Date Fair Value
Unvested, beginning of period	178,882		$	37.93	196,800		$	24.38
Granted	214,907		$	39.81	119,312		$	42.19
Vested	(63,191	)	$	40.92	(39,113	)	$	32.01
Forfeited	(4,454	)	$	41.04	(19,743	)	$	24.06
Unvested, end of period	326,144		$	38.55	257,256		$	31.50

Schedule of summary of amount of expense and related tax benefit

Share based compensation expense is recognized on a straight line basis over the vesting period. The amount of expense and related tax benefit is summarized below:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(in thousands)
Share based compensation expense	$	1,660	$	1,784	$	3,115	$	3,578
U.S. tax benefit on share based compensation expense	198		477		371		946

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Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) company $ / shares	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2018 USD ($) company $ / shares	Jun. 30, 2017 USD ($) $ / shares	Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of insurance companies based in the United States | company	6		6
Investment in variable interest entities	$ 32,200		$ 32,200		$ 32,100
Effective U.S. federal income tax expense rate	8.20%	6.50%	8.40%	7.20%
Percentage of available for sale securities	12.50%	12.30%	12.50%	12.30%
Net income	$ 16,984	$ 14,541	$ 32,617	$ 32,991
Basic earnings per share (in dollars per share) | $ / shares	$ 0.57	$ 0.49	$ 1.09	$ 1.12
Diluted earnings per share (in dollars per share) | $ / shares	$ 0.56	$ 0.48	$ 1.08	$ 1.09
ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of ASU	$ 0		$ 0
ASU 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of ASU	0		0
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income			32,617	$ 32,991
Retained Earnings | ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of ASU	4,682		4,682
Net income	$ 451		$ (922)
Basic earnings per share (in dollars per share) | $ / shares	$ 0.02
Diluted earnings per share (in dollars per share) | $ / shares	$ 0.01
Reduction in basic and diluted earnings per share | $ / shares			$ 0.03
Retained Earnings | ASU 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of ASU	$ (711)		$ (711)

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Investments - Narrative (Details) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) issuer	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) issuer loan	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($)
Gain (Loss) on Securities [Line Items]
Number of available-for-sale securities held in an unrealized loss position | issuer	219			219
Total fair value of unrealized loss position securities	$ 830,611			$ 830,611		$ 571,288
Total gross unrealized losses of unrealized loss position securities	$ 24,853			$ 24,853		7,754
Percentage of available for sale securities	12.50%		12.30%	12.50%	12.30%
Fair value	$ 1,105,396			$ 1,105,396		1,098,620
Impairment loss						1,500
Unpaid principal on impaired loans	3,500			3,500		8,400
Carrying value of loan	253,689			253,689		238,214
Allowance for credit losses on impaired loans	1,200		$ 705	$ 1,200	$ 705	$ 3,200	$ 943
Number of impaired loans held | loan				3		5
Carrying value of impaired loans	2,200			$ 2,200		$ 5,100
Average recorded investment in impaired bank loans				3,700	5,000
Investment income during period loans were impaired				65	179
Net realized gain (loss) on changes in fair value of impaired bank loans	(896)		(42)	(893)	135
Net trading losses still held	1			4
Carrying value of collateralized loan obligation held	4,700			4,700
Net realized investment (losses) gains	(64)		307	(874)	1,354
Investment income	$ 2,036		$ 2,359	3,857	8,421
Bank Holding Company
Gain (Loss) on Securities [Line Items]
Net realized investment (losses) gains					$ 409
Investment in certificate of deposit				1,000
Interest income				$ 3
Puerto Rico loan
Gain (Loss) on Securities [Line Items]
Unpaid principal on impaired loans						807
Carrying value of loan						$ 0
Net realized investment (losses) gains		$ 807
BBB- or better | Fixed maturity securities
Gain (Loss) on Securities [Line Items]
Percentage of available for sale securities	100.00%			100.00%

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Investments - Schedule of Available-for-Sale Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	$ 1,039,778	$ 1,008,662
Total investments available-for-sale, Fair Value	1,021,387	1,016,098
Equity securities, Cost or Amortized Cost	77,995	75,318
Equity securities, Gross Unrealized Gains	6,675	7,830
Equity securities, Gross Unrealized Loss	(661)	(626)
Equity securities, Fair Value	84,009	82,522
Total investments available-for-sale, Cost or Amortized Cost	1,117,773	1,083,980
Total investments available-for-sale, Gross Unrealized Gains	12,476	22,394
Total investments available-for-sale, Gross Unrealized Losses	(24,853)	(7,754)
Total investments available-for-sale, Fair Value	1,105,396	1,098,620
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	1,039,778	1,008,662
Total investments available-for-sale, Gross Unrealized Gains	5,801	14,564
Total investments available-for-sale, Gross Unrealized Losses	(24,192)	(7,128)
Total investments available-for-sale, Fair Value	1,021,387	1,016,098
State and municipal
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	137,055	139,382
Total investments available-for-sale, Gross Unrealized Gains	3,590	5,587
Total investments available-for-sale, Gross Unrealized Losses	(2,272)	(603)
Total investments available-for-sale, Fair Value	138,373	144,366
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	190,574	160,379
Total investments available-for-sale, Gross Unrealized Gains	445	723
Total investments available-for-sale, Gross Unrealized Losses	(6,268)	(2,441)
Total investments available-for-sale, Fair Value	184,751	158,661
Corporate
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	439,993	408,857
Total investments available-for-sale, Gross Unrealized Gains	1,655	7,503
Total investments available-for-sale, Gross Unrealized Losses	(11,303)	(2,639)
Total investments available-for-sale, Fair Value	430,345	413,721
Commercial mortgage and asset-backed
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	177,286	182,595
Total investments available-for-sale, Gross Unrealized Gains	85	714
Total investments available-for-sale, Gross Unrealized Losses	(2,929)	(698)
Total investments available-for-sale, Fair Value	174,442	182,611
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	5,702	35,948
Total investments available-for-sale, Gross Unrealized Gains	0	0
Total investments available-for-sale, Gross Unrealized Losses	(13)	(101)
Total investments available-for-sale, Fair Value	5,689	35,847
U.S. Treasury securities and obligations guaranteed by the U.S. government
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	87,143	79,476
Total investments available-for-sale, Gross Unrealized Gains	26	37
Total investments available-for-sale, Gross Unrealized Losses	(1,372)	(639)
Total investments available-for-sale, Fair Value	85,797	78,874
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	2,025	2,025
Total investments available-for-sale, Gross Unrealized Gains	0	0
Total investments available-for-sale, Gross Unrealized Losses	(35)	(7)
Total investments available-for-sale, Fair Value	$ 1,990	$ 2,018

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Investments - Schedule of Contract Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Cost or Amortized Cost
One year or less	$ 40,895
After one year through five years	317,761
After five years through ten years	193,545
After ten years	117,692
Residential mortgage-backed	190,574
Commercial mortgage and asset-backed	177,286
Redeemable preferred stock	2,025
Total fixed maturity securities, Cost or Amortized Cost	1,039,778	$ 1,008,662
Fair Value
One year or less	40,760
After one year through five years	312,999
After five years through ten years	187,368
After ten years	119,077
Residential mortgage-backed	184,751
Commercial mortgage and asset-backed	174,442
Redeemable preferred stock	1,990
Total investments available-for-sale, Fair Value	$ 1,021,387	$ 1,016,098

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Investments - Schedule of Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 640,810	$ 319,654
Less Than 12 Months, Gross Unrealized Losses	(15,259)	(2,172)
12 Months or More, Fair Value	189,801	251,634
12 Months or More, Gross Unrealized Losses	(9,594)	(5,582)
Total, Fair Value	830,611	571,288
Total, Gross Unrealized Losses	(24,853)	(7,754)
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(14,997)	(2,107)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	184,174	245,969
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	9,195	5,021
Debt Securities, Available-for-sale, Unrealized Loss Position	(814,856)	(559,764)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(24,192)	(7,128)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	630,682	313,795
State and municipal
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,800)	(318)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	10,402	10,662
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	472	285
Debt Securities, Available-for-sale, Unrealized Loss Position	(72,649)	(50,779)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(2,272)	(603)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	62,247	40,117
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,123)	(261)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	76,384	84,193
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,145	2,180
Debt Securities, Available-for-sale, Unrealized Loss Position	(167,902)	(134,640)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(6,268)	(2,441)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	91,518	50,447
Corporate
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(7,730)	(846)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	57,914	66,954
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,573	1,793
Debt Securities, Available-for-sale, Unrealized Loss Position	(350,433)	(180,418)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(11,303)	(2,639)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	292,519	113,464
Commercial mortgage and asset-backed
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,194)	(244)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	20,388	25,299
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	735	454
Debt Securities, Available-for-sale, Unrealized Loss Position	(132,638)	(79,264)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(2,929)	(698)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	112,250	53,965
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	5,689	32,154
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	13	100
Debt Securities, Available-for-sale, Unrealized Loss Position	(5,689)	(35,178)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(13)	(101)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	3,024
U.S. Treasury securities and obligations guaranteed by the U.S. government
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,115)	(430)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	13,397	26,707
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	257	209
Debt Securities, Available-for-sale, Unrealized Loss Position	(83,555)	(77,467)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,372)	(639)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	70,158	50,760
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(35)	(7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	(1,990)	(2,018)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(35)	(7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,990	2,018
Equity securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	10,128	5,859
Less Than 12 Months, Gross Unrealized Losses	(262)	(65)
12 Months or More, Fair Value	5,627	5,665
12 Months or More, Gross Unrealized Losses	(399)	(561)
Total, Fair Value	15,755	11,524
Total, Gross Unrealized Losses	$ (661)	$ (626)

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Investments - Summary of Realized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments [Abstract]
Fixed maturity securities, gross realized gains	$ 360	$ 18	$ 382	$ 356
Fixed maturity securities, gross realized losses	(252)	(31)	(475)	(327)
Fixed maturity securities	108	(13)	(93)	29
Bank loan participations, gross realized gains	360	471	1,580	1,607
Bank loan participations, gross realized losses	(1,006)	(150)	(1,106)	(689)
Bank loan participations	(646)	321	474	918
Equity securities, gross realized gain	0	0	0	409
Equity securities, gross realized losses	(47)	0	(62)	0
Equity securities, changes in fair values of equity securities	521	0	(1,189)	0
Equity securities	474	0	(1,251)	409
Short-term investments and other, gross realized gains	0	0	0	0
Short-term investments and other, gross realized losses	0	(1)	(4)	(2)
Short-term investments and other	0	(1)	(4)	(2)
Total	$ (64)	$ 307	$ (874)	$ 1,354

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Investments - Summary of Private Debt and Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Net Investment Income [Line Items]
Net realized gain (loss) on changes in fair value of impaired bank loans	$ (896)	$ (42)	$ (893)	$ 135
Total other invested assets	76,813		76,813		$ 70,208
Investment income	2,036	2,359	3,857	8,421
Renewable energy LLCs
Net Investment Income [Line Items]
Total other invested assets	32,204		32,204		32,063
Investment income	530	1,521	1,741	7,115
Renewable energy bridge financing notes
Net Investment Income [Line Items]
Total other invested assets	8,750		8,750		7,278
Investment income	328	49	$ 625	49
Rate of interest			15.00%
Interest income	328	49	$ 625	49
Limited partnerships
Net Investment Income [Line Items]
Total other invested assets	31,359		31,359		26,367
Investment income	1,092	703	1,319	1,085
Bank Holding Companies [Member]
Net Investment Income [Line Items]
Total other invested assets	4,500		4,500		$ 4,500
Investment income	86	86	172	172
Interest income	86	86	$ 172	172
Bank Holding Company
Net Investment Income [Line Items]
Rate of interest			7.60%
Interest income			$ 3
Investment in private subordinated notes			4,500
Corporate and other | Limited partnerships
Net Investment Income [Line Items]
Carrying values of limited partnerships held	3,200		3,200
Investment income (loss)	333	152	208	220
Corporate and other | Investment in LLC
Net Investment Income [Line Items]
Cash distributions from LLCs			2,100	3,600
Excess and Surplus Lines | Limited partnerships
Net Investment Income [Line Items]
Carrying values of limited partnerships held	28,100		28,100
Investment income (loss)	759	$ 551	1,100	$ 865
Commitment to investment in limited partnership	$ 625		$ 625
Minimum | Corporate and other | Investment in LLC
Net Investment Income [Line Items]
Ownership percentage	2.60%		2.60%
Maximum | Corporate and other | Investment in LLC
Net Investment Income [Line Items]
Ownership percentage	32.80%		32.80%

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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 11, 2007
Business Acquisition [Line Items]
Goodwill	$ 181,831	$ 181,831	$ 181,831
James River Group, Inc.
Business Acquisition [Line Items]
Percentage of outstanding shares				100.00%

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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Acquired Intangible Assets [Line Items]
Identifiable intangibles not subject to amortization	$ 31,364	$ 31,364
Identifiable intangible assets subject to amortization
Gross Carrying Amount	11,611	11,611
Accumulated Amortization	4,939	4,641
Total Intangible Assets, Gross	42,975	42,975
Trademarks
Acquired Intangible Assets [Line Items]
Identifiable intangibles not subject to amortization	22,200	22,200
Insurance licenses and authorities
Acquired Intangible Assets [Line Items]
Identifiable intangibles not subject to amortization	9,164	9,164
Broker relationships
Identifiable intangible assets subject to amortization
Gross Carrying Amount	11,611	11,611
Accumulated Amortization	$ 4,939	$ 4,641
Life (Years)	24 years 7 months 6 days

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Earnings Per Share - Narrative (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock options and restricted share units ("RSU's")
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of securities excluded from the calculations of diluted earnings per share	182,246	201,821	187,502	150,075

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Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income to shareholders	$ 16,984	$ 14,541	$ 32,617	$ 32,991
Weighted average common shares outstanding:
Basic (in shares)	29,882,988	29,406,877	29,823,982	29,348,557
Common share equivalents (in shares)	410,945	900,222	419,964	969,028
Diluted (in shares)	30,293,933	30,307,099	30,243,946	30,317,585
Earnings per share:
Basic (in dollars per share)	$ 0.57	$ 0.49	$ 1.09	$ 1.12
Common share equivalents (in dollars per share)	(0.01)	(0.01)	(0.01)	(0.03)
Diluted (in dollars per share)	$ 0.56	$ 0.48	$ 1.08	$ 1.09

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Reserve for Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Favorable development on prior year loss reserves
Reserve for losses and loss adjustment expenses	$ (2,224)	$ (1,715)	$ 386	$ 1,699
Excess and Surplus Lines
Favorable development on prior year loss reserves
Reserve for losses and loss adjustment expenses	58	1,400	1,200	4,700
Excess and Surplus Lines | 2017 Catastrophe Losses
Favorable development on prior year loss reserves
Reserve for losses and loss adjustment expenses	1,900		1,900
Specialty Admitted Insurance
Favorable development on prior year loss reserves
Reserve for losses and loss adjustment expenses	167	(949)	1,500	(907)
Casualty Reinsurance
Favorable development on prior year loss reserves
Reserve for losses and loss adjustment expenses	$ (2,400)	$ (2,200)	$ (2,300)	$ (2,100)

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Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Losses and Loss Adjustment Balances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract]
Reserve for losses and loss adjustment expenses net of reinsurance recoverables at beginning of period	$ 1,038,303	$ 791,781	$ 989,825	$ 761,128
Add: Incurred losses and loss adjustment expenses net of reinsurance:
Current year	152,371	129,369	298,753	238,152
Prior years	2,224	1,715	(386)	(1,699)
Total incurred losses and loss and adjustment expenses	154,595	131,084	298,367	236,453
Deduct: Loss and loss adjustment expense payments net of reinsurance:
Current year	20,577	13,908	32,754	17,606
Prior years	79,503	69,449	162,620	140,467
Total loss and loss adjustment expense payments	100,080	83,357	195,374	158,073
Reserve for losses and loss adjustment expenses net of reinsurance recoverables at end of period	1,092,818	839,508	1,092,818	839,508
Add: Reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period	375,535	221,553	375,535	221,553	$ 302,524
Reserve for losses and loss adjustment expenses gross of reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period	$ 1,468,353	$ 1,061,061	$ 1,468,353	$ 1,061,061	$ 1,292,349

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Other Comprehensive Income - Summary of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized (losses) gains arising during the period, before U.S. income taxes	$ (6,633)	$ 7,853	$ (25,925)	$ 13,851
U.S. income taxes	155	(1,156)	699	(2,792)
Unrealized (losses) gains arising during the period, net of U.S. income taxes	(6,478)	6,697	(25,226)	11,059
Less reclassification adjustment:
Net realized investment losses (gains)	108	(12)	(93)	438
U.S. income tax expenses	(28)	1	(28)	(121)
Reclassification adjustment for investment losses (gains) realized in net income	80	(11)	(121)	317
Other comprehensive (loss) income	$ (6,558)	$ 6,708	$ (25,105)	$ 10,742

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Contingent Liabilities - Narrative (Details) $ in Millions	Jun. 30, 2018 USD ($)
JRG Reinsurance Company, Ltd. | Letter of credit 100 Million
Contingent Liabilities [Line Items]
Letters of credit facility, amount	$ 100.0
Amount of letters of credit issued	45.5
Assets deposited for securing letters of credit	59.0
JRG Reinsurance Company, Ltd. | Letter of credit 102.5 Million
Contingent Liabilities [Line Items]
Letters of credit facility, amount	102.5
Amount of letters of credit issued	100.2
Assets deposited for securing letters of credit	126.3
JRG Reinsurance Company, Ltd. | Letter of credit 100 Million one
Contingent Liabilities [Line Items]
Letters of credit facility, amount	100.0
Amount of letters of credit issued	6.9
Assets deposited for securing letters of credit	10.0
James River Insurance Co
Contingent Liabilities [Line Items]
Total amount deposited in trust accounts	944.8
Third-party Reinsureds | JRG Reinsurance Company, Ltd.
Contingent Liabilities [Line Items]
Total amount deposited in trust accounts	$ 271.8

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Segment Information - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Fee income in Excess and Surplus Lines segment | $	$ 3.7	$ 4.2	$ 8.5	$ 8.1

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Segment Information - Summary of Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Gross written premiums	$ 293,378	$ 281,475	$ 591,494	$ 505,654
Net earned premiums	208,210	184,077	409,152	338,764
Underwriting profit of insurance segments	12,834	10,259	27,500	20,994
Net investment income	16,135	13,714	29,391	30,447
Interest expense	2,946	2,224	5,468	4,347
Segment revenues	228,041	202,394	446,385	378,796
Segment goodwill	181,831	181,831	181,831	181,831	$ 181,831
Segment assets	2,937,376	2,532,053	2,937,376	2,532,053	$ 2,756,695
Excess and Surplus Lines
Segment Reporting Information [Line Items]
Gross written premiums	165,398	138,004	332,884	246,999
Net earned premiums	139,127	117,268	269,098	211,117
Underwriting profit of insurance segments	10,117	11,729	21,416	20,529
Net investment income	4,350	3,841	7,392	7,024
Interest expense	0	0	0	0
Segment revenues	147,012	125,484	284,339	226,574
Segment goodwill	181,831	181,831	181,831	181,831
Segment assets	907,314	779,428	907,314	779,428
Specialty Admitted Insurance
Segment Reporting Information [Line Items]
Gross written premiums	97,100	76,771	184,501	149,235
Net earned premiums	14,266	17,760	27,606	34,013
Underwriting profit of insurance segments	988	553	2,611	1,395
Net investment income	839	631	1,550	1,267
Interest expense	0	0	0	0
Segment revenues	15,436	18,435	29,391	35,359
Segment goodwill	0	0	0	0
Segment assets	566,196	369,515	566,196	369,515
Casualty Reinsurance
Segment Reporting Information [Line Items]
Gross written premiums	30,880	66,700	74,109	109,420
Net earned premiums	54,817	49,049	112,448	93,634
Underwriting profit of insurance segments	1,729	(2,023)	3,473	(930)
Net investment income	9,662	7,386	17,679	14,510
Interest expense	0	0	0	0
Segment revenues	64,254	56,574	129,780	108,720
Segment goodwill	0	0	0	0
Segment assets	1,378,305	1,268,560	1,378,305	1,268,560
Corporate and other
Segment Reporting Information [Line Items]
Gross written premiums	0	0	0	0
Net earned premiums	0	0	0	0
Underwriting profit of insurance segments	0	0	0	0
Net investment income	1,284	1,856	2,770	7,646
Interest expense	2,946	2,224	5,468	4,347
Segment revenues	1,339	1,901	2,875	8,143
Segment goodwill	0	0	0	0
Segment assets	$ 85,561	$ 114,550	$ 85,561	$ 114,550

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Segment Information - Reconciliation of Operating Segments by Individual Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total underwriting profit of insurance segments	$ 12,834	$ 10,259	$ 27,500	$ 20,994
Other operating expenses of the Corporate and Other segment	(7,307)	(6,095)	(14,738)	(12,556)
Underwriting profit	5,527	4,164	12,762	8,438
Net investment income	16,135	13,714	29,391	30,447
Net realized investment (losses) gains	(64)	307	(874)	1,354
Amortization of intangible assets	(149)	(149)	(298)	(298)
Other income and expenses	4	(257)	108	(57)
Interest expense	(2,946)	(2,224)	(5,468)	(4,347)
Income before taxes	18,507	15,555	35,621	35,537
Excess and Surplus Lines
Segment Reporting Information [Line Items]
Total underwriting profit of insurance segments	10,117	11,729	21,416	20,529
Net investment income	4,350	3,841	7,392	7,024
Interest expense	0	0	0	0
Specialty Admitted Insurance
Segment Reporting Information [Line Items]
Total underwriting profit of insurance segments	988	553	2,611	1,395
Net investment income	839	631	1,550	1,267
Interest expense	0	0	0	0
Casualty Reinsurance
Segment Reporting Information [Line Items]
Total underwriting profit of insurance segments	1,729	(2,023)	3,473	(930)
Net investment income	9,662	7,386	17,679	14,510
Interest expense	0	0	0	0
Corporate and other
Segment Reporting Information [Line Items]
Total underwriting profit of insurance segments	0	0	0	0
Net investment income	1,284	1,856	2,770	7,646
Interest expense	$ (2,946)	$ (2,224)	$ (5,468)	$ (4,347)

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Other Operating Expenses and Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Operating Expenses And Other Expenses [Abstract]
Amortization of policy acquisition costs	$ 28,672	$ 31,614	$ 58,870	$ 59,252
Other underwriting expenses of the operating segments	15,772	15,327	32,926	30,121
Other operating expenses of the Corporate and Other segment	7,307	6,095	14,738	12,556
Total	$ 51,751	$ 53,036	$ 106,534	$ 101,929

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Fair Value Measurements - Narrative (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	$ 1,105,396,000	$ 1,098,620,000
Impaired bank loan participations held for investment	2,200,000	5,100,000
Unpaid principal on bank loan participations for which external sources were unavailable to determine fair value		807,000
Carrying value of bank loan participations for which external sources were unavailable to determine fair value		$ 0
Market approach | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	$ 4,700,000

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Fair Value Measurements - Summary of Assets Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 1,105,396	$ 1,098,620
Trading securities:
Fixed maturity securities	0	3,808
Short-term investments	25,140	36,804
Recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	1,105,396	1,098,620
Trading securities:
Fixed maturity securities	0	3,808
Short-term investments	25,140	36,804
Recurring basis | Fixed maturity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	1,021,387	1,016,098
Recurring basis | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	138,373	144,366
Recurring basis | Residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	184,751	158,661
Recurring basis | Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	430,345	413,721
Recurring basis | Commercial mortgage and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	174,442	182,611
Recurring basis | Obligations of U.S. government corporations and agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	5,689	35,847
Recurring basis | U.S. Treasury securities and obligations guaranteed by the U.S. government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	85,797	78,874
Recurring basis | Redeemable preferred stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	1,990	2,018
Recurring basis | Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	84,009	82,522
Recurring basis | Preferred stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	64,866	66,281
Recurring basis | Common stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	19,143	16,241
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	100,538	93,772
Trading securities:
Fixed maturity securities	0	0
Short-term investments	1,000	1,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Fixed maturity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	85,227	78,265
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Commercial mortgage and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Obligations of U.S. government corporations and agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | U.S. Treasury securities and obligations guaranteed by the U.S. government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	85,227	78,265
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Redeemable preferred stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	15,311	15,507
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Preferred stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Common stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	15,311	15,507
Recurring basis | Significant Other Observable Inputs Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	1,000,178	1,000,168
Trading securities:
Fixed maturity securities	0	3,808
Short-term investments	24,140	35,804
Recurring basis | Significant Other Observable Inputs Level 2 | Fixed maturity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	931,480	933,153
Recurring basis | Significant Other Observable Inputs Level 2 | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	138,373	144,366
Recurring basis | Significant Other Observable Inputs Level 2 | Residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	184,751	158,661
Recurring basis | Significant Other Observable Inputs Level 2 | Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	430,345	413,721
Recurring basis | Significant Other Observable Inputs Level 2 | Commercial mortgage and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	169,762	177,931
Recurring basis | Significant Other Observable Inputs Level 2 | Obligations of U.S. government corporations and agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	5,689	35,847
Recurring basis | Significant Other Observable Inputs Level 2 | U.S. Treasury securities and obligations guaranteed by the U.S. government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	570	609
Recurring basis | Significant Other Observable Inputs Level 2 | Redeemable preferred stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	1,990	2,018
Recurring basis | Significant Other Observable Inputs Level 2 | Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	68,698	67,015
Recurring basis | Significant Other Observable Inputs Level 2 | Preferred stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	64,866	66,281
Recurring basis | Significant Other Observable Inputs Level 2 | Common stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	3,832	734
Recurring basis | Significant Unobservable Inputs Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	4,680	4,680
Trading securities:
Fixed maturity securities	0	0
Short-term investments	0	0
Recurring basis | Significant Unobservable Inputs Level 3 | Fixed maturity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	4,680	4,680
Recurring basis | Significant Unobservable Inputs Level 3 | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Significant Unobservable Inputs Level 3 | Residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Significant Unobservable Inputs Level 3 | Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Significant Unobservable Inputs Level 3 | Commercial mortgage and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	4,680	4,680
Recurring basis | Significant Unobservable Inputs Level 3 | Obligations of U.S. government corporations and agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Significant Unobservable Inputs Level 3 | U.S. Treasury securities and obligations guaranteed by the U.S. government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Significant Unobservable Inputs Level 3 | Redeemable preferred stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Significant Unobservable Inputs Level 3 | Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Significant Unobservable Inputs Level 3 | Preferred stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	0	0
Recurring basis | Significant Unobservable Inputs Level 3 | Common stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 0	$ 0

XML

Fair Value Measurements - Summary of Assets Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bank loan participations held-for-investment	$ 2,200	$ 5,100
Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bank loan participations held-for-investment	2,243	5,111
Nonrecurring basis | Quoted Prices in Active Markets for Identical Assets Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bank loan participations held-for-investment	0	0
Nonrecurring basis | Significant Other Observable Inputs Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bank loan participations held-for-investment	0	0
Nonrecurring basis | Significant Unobservable Inputs Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bank loan participations held-for-investment	$ 2,243	$ 5,111

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Fair Value Measurements - Summary of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Available-for-sale:
Fixed maturity securities	$ 1,021,387	$ 1,016,098
Equity securities	84,009	82,522
Trading:
Bank loan participations held-for-investment	253,689	238,214
Cash and cash equivalents	267,367	163,495	$ 87,771	$ 109,784
Short-term investments	25,140	36,804
Liabilities
Senior debt	98,300	98,300
Junior subordinated debt	104,055	104,055
Carrying Value
Available-for-sale:
Fixed maturity securities	1,021,387	1,016,098
Equity securities	84,009	82,522
Trading:
Fixed maturity securities	0	3,808
Bank loan participations held-for-investment	253,689	238,214
Cash and cash equivalents	267,367	163,495
Short-term investments	25,140	36,804
Other invested assets – notes receivable	13,250	11,778
Liabilities
Senior debt	98,300	98,300
Junior subordinated debt	104,055	104,055
Fair Value
Available-for-sale:
Fixed maturity securities	1,021,387	1,016,098
Equity securities	84,009	82,522
Trading:
Fixed maturity securities	0	3,808
Bank loan participations held-for-investment	252,836	236,532
Cash and cash equivalents	267,367	163,495
Short-term investments	25,140	36,804
Other invested assets – notes receivable	18,880	17,104
Liabilities
Senior debt	97,960	97,884
Junior subordinated debt	$ 115,472	$ 116,569

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Capital Stock and Equity Awards - Commons Shares (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares outstanding	29,917,821	29,696,682
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares issued during period	221,139
Common stock, shares outstanding	29,917,821	29,696,682	29,467,647	29,257,566
Options | Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares issued during period	177,835
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit dividend equivalents	$ 500,870	$ 434,000
Dividends payable	$ 197,000		$ 154,000
RSUs | Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares issued during period	43,304

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Capital Stock and Equity Awards - Schedule of Dividends (Details) - USD ($) $ / shares in Units, $ in Millions									3 Months Ended		6 Months Ended
	Jun. 29, 2018	May 01, 2018	Mar. 30, 2018	Feb. 22, 2018	Jun. 30, 2017	May 02, 2017	Mar. 31, 2017	Feb. 14, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stockholders' Equity Note [Abstract]
Dividend declared per share (in dollars per share)		$ 0.30		$ 0.30		$ 0.30		$ 0.30	$ 0.30	$ 0.30	$ 0.60	$ 0.60
Total Amount	$ 9.1		$ 9.0		$ 8.9		$ 8.9				$ 18.1	$ 17.8

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Capital Stock and Equity Awards - Equity Incentive Plans (Details)	Jun. 30, 2018 shares
2014 LTIP | Non-qualified stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares available for issuance	4,171,150
Number of shares available for grant	1,692,615
2014 Director Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares available for issuance	50,000
Number of shares available for grant	21,663

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Capital Stock and Equity Awards - Summary of Option Activity (Details) - Options - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Shares
Beginning of period (in shares)	1,479,236	2,234,699
Granted (in shares)	0	205,244
Exercised (in shares)	(255,609)	(443,114)
Forfeited (in shares)	(29,446)	(50,062)
End of period (in shares)	1,194,181	1,946,767
Exercisable, end of period (in shares)	876,816	992,395
Weighted- Average Exercise Price
Beginning of period (in dollars per share)	$ 27.81	$ 22.84
Granted (in dollars per share)	0.00	42.24
Exercised (in dollars per share)	21.14	18.72
Forfeited (in dollars per share)	36.26	27.97
End of period (in dollars per share)	29.04	25.69
Exercisable, end of period (in dollars per share)	$ 26.59	$ 20.95
Vesting period (in years)	7 years
Minimum
Weighted- Average Exercise Price
Vesting period (in years)	2 years
Maximum
Weighted- Average Exercise Price
Vesting period (in years)	4 years

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Capital Stock and Equity Awards - Summary of RSU Activity (Details) - RSUs - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Shares
Unvested, beginning of period (in shares)	178,882	196,800
Granted (in shares)	214,907	119,312
Vested (in shares)	(63,191)	(39,113)
Forfeited (in shares)	(4,454)	(19,743)
Unvested, end of period (in shares)	326,144	257,256
Shares
Unvested, beginning of period (in dollars per share)	$ 37.93	$ 24.38
Granted (in dollars per share)	39.81	42.19
Vested (in dollars per share)	40.92	32.01
Forfeited (in dollars per share)	41.04	24.06
Unvested, end of period (in dollars per share)	$ 38.55	$ 31.50
Vesting period (in years)	3 years
Non-employee directors
Shares
Vesting period (in years)	1 year
Minimum
Shares
Vesting period (in years)	1 year
Maximum
Shares
Vesting period (in years)	5 years

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Capital Stock and Equity Awards - Summary of Share Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stockholders' Equity Note [Abstract]
Share based compensation expense	$ 1,660	$ 1,784	$ 3,115	$ 3,578
U.S. tax benefit on share based compensation expense	$ 198	$ 477	$ 371	$ 946

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Capital Stock and Equity Awards - Compensation Expense (Details) $ in Millions	3 Months Ended
	Jun. 30, 2018 USD ($)
Equity [Abstract]
Unrecognized share based compensation expense	$ 11.9
Weighted-average period of unrecognized share based compensation expense (in years)	2 years 1 month 6 days
Weighted-average remaining contractual life of options outstanding (in years)	4 years 1 month 6 days
Weighted-average remaining contractual life of options exercisable (in years)	3 years 9 months 18 days

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Subsequent Events (Details) - Subsequent event - $ / shares	Sep. 28, 2018	Sep. 10, 2018	Jul. 31, 2018
Subsequent Event [Line Items]
Dividends payable, date declared			Jul. 31, 2018
Cash dividend declared (in dollars per share)			$ 0.30
Dividends payable, date to be paid	Sep. 28, 2018
Dividend payable, record date		Sep. 10, 2018