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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
AMORTIZED COST/COST AND FAIR VALUES OF FIXED MATURITIES AND EQUITIES
The amortized cost and fair values of the Company's fixed maturities classified as available for sale were as follows:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
value
 
Non-credit
OTTI
in AOCI(5)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
Fixed maturities
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency
$
1,520,142

 
$
4,232

 
$
(8,677
)
 
$
1,515,697

 
$
—

 
 
Non-U.S. government
507,550

 
1,586

 
(16,120
)
 
493,016

 
—

 
 
Corporate debt
4,990,279

 
15,086

 
(128,444
)
 
4,876,921

 
—

 
 
Agency RMBS(1)
1,666,684

 
6,508

 
(29,884
)
 
1,643,308

 
—

 
 
CMBS(2)
1,103,507

 
2,818

 
(13,795
)
 
1,092,530

 
—

 
 
Non-Agency RMBS
40,732

 
1,237

 
(1,282
)
 
40,687

 
(857
)
 
 
ABS(3)
1,651,350

 
1,493

 
(15,240
)
 
1,637,603

 
—

 
 
Municipals(4)
136,068

 
914

 
(1,397
)
 
135,585

 
—

 
 
Total fixed maturities
$
11,616,312

 
$
33,874

 
$
(214,839
)
 
$
11,435,347

 
$
(857
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Fixed maturities
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency
$
1,727,643

 
$
1,735

 
$
(16,909
)
 
$
1,712,469

 
$
—

 
 
Non-U.S. government
798,582

 
17,240

 
(9,523
)
 
806,299

 
—

 
 
Corporate debt
5,265,795

 
61,922

 
(29,851
)
 
5,297,866

 
—

 
 
Agency RMBS(1)
2,414,720

 
8,132

 
(27,700
)
 
2,395,152

 
—

 
 
CMBS(2)
776,715

 
4,138

 
(3,125
)
 
777,728

 
—

 
 
Non-Agency RMBS
45,713

 
1,917

 
(799
)
 
46,831

 
(853
)
 
 
ABS(3)
1,432,884

 
5,391

 
(1,994
)
 
1,436,281

 
—

 
 
Municipals(4)
149,167

 
1,185

 
(972
)
 
149,380

 
—

 
 
Total fixed maturities
$
12,611,219

 
$
101,660

 
$
(90,873
)
 
$
12,622,006

 
$
(853
)
 
 
 
 
 
 
 
 
 
 
 
 
 
(1)
Residential mortgage-backed securities ("RMBS") originated by U.S. government-sponsored agencies.
(2)
Commercial mortgage-backed securities ("CMBS").
(3)
Asset-backed securities ("ABS") include debt tranched securities collateralized primarily by auto loans, student loans, credit card receivables, collateralized debt obligations ("CDOs") and collateralized loan obligations ("CLOs").
(4)
Municipals include bonds issued by states, municipalities and political subdivisions.
(5)
Represents the non-credit component of the other-than-temporary impairment ("OTTI") losses, adjusted for subsequent sales, maturities and redemptions. It does not include the change in fair value subsequent to the impairment measurement date.
EQUITY SECURITIES
The cost and fair values of the Company's equity securities were as follows:
 
 
 
 
 
 
 
 
 
 
 
 
Cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
value
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2018
 
 
 
 
 
 
 
 
 
Equity securities
 
 
 
 
 
 
 
 
 
Common stocks
$
790

 
$
112

 
$
(375
)
 
$
527

 
 
Exchange-traded funds
213,420

 
33,498

 
(10,079
)
 
236,839

 
 
Bond mutual funds
151,695

 
—

 
(7,428
)
 
144,267

 
 
Total equity securities
$
365,905

 
$
33,610

 
$
(17,882
)
 
$
381,633

 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2017
 
 
 
 
 
 
 
 
 
Equity securities
 
 
 
 
 
 
 
 
 
Common stocks
$
22,836

 
$
3,412

 
$
(590
)
 
$
25,658

 
 
Exchange-traded funds
356,252

 
71,675

 
(294
)
 
427,633

 
 
Bond mutual funds
173,779

 
9,440

 
(999
)
 
182,220

 
 
Total equity securities
$
552,867

 
$
84,527

 
$
(1,883
)
 
$
635,511

 
 
 
 
 
 
 
 
 
 
 
CONTRACTUAL MATURITIES OF FIXED MATURITIES
Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The contractual maturities of fixed maturities are shown below:
 
 
 
 
 
 
 
 
 
 
Amortized
cost
 
Fair
value
 
% of Total
fair value
 
 
 
 
 
 
 
 
 
 
At December 31, 2018
 
 
 
 
 
 
 
Maturity
 
 
 
 
 
 
 
Due in one year or less
$
430,390

 
$
426,142

 
3.7
%
 
 
Due after one year through five years
4,751,064

 
4,691,263

 
41.0
%
 
 
Due after five years through ten years
1,762,452

 
1,697,737

 
14.8
%
 
 
Due after ten years
210,133

 
206,077

 
1.8
%
 
 
 
7,154,039

 
7,021,219

 
61.3
%
 
 
Agency RMBS
1,666,684

 
1,643,308

 
14.4
%
 
 
CMBS
1,103,507

 
1,092,530

 
9.6
%
 
 
Non-Agency RMBS
40,732

 
40,687

 
0.4
%
 
 
ABS
1,651,350

 
1,637,603

 
14.3
%
 
 
Total
$
11,616,312

 
$
11,435,347

 
100.0
%
 
 
 
 
 
 
 
 
 
 
At December 31, 2017
 
 
 
 
 
 
 
Maturity
 
 
 
 
 
 
 
Due in one year or less
$
486,659

 
$
484,663

 
3.8
%
 
 
Due after one year through five years
4,906,207

 
4,912,189

 
38.9
%
 
 
Due after five years through ten years
2,338,964

 
2,350,433

 
18.6
%
 
 
Due after ten years
209,357

 
218,729

 
1.7
%
 
 
 
7,941,187

 
7,966,014

 
63.0
%
 
 
Agency RMBS
2,414,720

 
2,395,152

 
19.0
%
 
 
CMBS
776,715

 
777,728

 
6.2
%
 
 
Non-Agency RMBS
45,713

 
46,831

 
0.4
%
 
 
ABS
1,432,884

 
1,436,281

 
11.4
%
 
 
Total
$
12,611,219

 
$
12,622,006

 
100.0
%
 
 
 
 
 
 
 
 
 
FIXED MATURITIES AND EQUITIES IN AN UNREALIZED LOSS POSITION
The following table summarizes fixed maturities and equity securities in an unrealized loss position and the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
12 months or greater
 
Less than 12 months
 
Total
 
 
  
Fair
value
 
Unrealized
losses
 
Fair
value
 
Unrealized
losses
 
Fair
value
 
Unrealized
losses
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2018(1)
 
 
 
 
 
 
 
 
 
 
 
 
 
Fixed maturities
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency
$
374,030

 
$
(7,659
)
 
$
424,439

 
$
(1,018
)
 
$
798,469

 
$
(8,677
)
 
 
Non-U.S. government
44,339

 
(2,004
)
 
303,376

 
(14,116
)
 
347,715

 
(16,120
)
 
 
Corporate debt
1,439,378

 
(58,915
)
 
2,547,135

 
(69,529
)
 
3,986,513

 
(128,444
)
 
 
Agency RMBS
940,645

 
(29,255
)
 
117,181

 
(629
)
 
1,057,826

 
(29,884
)
 
 
CMBS
455,582

 
(11,430
)
 
353,802

 
(2,365
)
 
809,384

 
(13,795
)
 
 
Non-Agency RMBS
9,494

 
(1,170
)
 
11,432

 
(112
)
 
20,926

 
(1,282
)
 
 
ABS
237,237

 
(2,755
)
 
1,150,692

 
(12,485
)
 
1,387,929

 
(15,240
)
 
 
Municipals
68,814

 
(1,373
)
 
9,894

 
(24
)
 
78,708

 
(1,397
)
 
 
Total fixed maturities
$
3,569,519

 
$
(114,561
)
 
$
4,917,951

 
$
(100,278
)
 
$
8,487,470

 
$
(214,839
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
Fixed maturities
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency
$
194,916

 
$
(5,963
)
 
$
1,389,792

 
$
(10,946
)
 
$
1,584,708

 
$
(16,909
)
 
 
Non-U.S. government
62,878

 
(6,806
)
 
204,110

 
(2,717
)
 
266,988

 
(9,523
)
 
 
Corporate debt
407,300

 
(11,800
)
 
2,041,845

 
(18,051
)
 
2,449,145

 
(29,851
)
 
 
Agency RMBS
759,255

 
(17,453
)
 
1,172,313

 
(10,247
)
 
1,931,568

 
(27,700
)
 
 
CMBS
31,607

 
(703
)
 
348,943

 
(2,422
)
 
380,550

 
(3,125
)
 
 
Non-Agency RMBS
8,029

 
(788
)
 
4,197

 
(11
)
 
12,226

 
(799
)
 
 
ABS
57,298

 
(570
)
 
392,170

 
(1,424
)
 
449,468

 
(1,994
)
 
 
Municipals
11,230

 
(269
)
 
65,632

 
(703
)
 
76,862

 
(972
)
 
 
Total fixed maturities
$
1,532,513

 
$
(44,352
)
 
$
5,619,002

 
$
(46,521
)
 
$
7,151,515

 
$
(90,873
)
 
 
Equity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
Common stocks
$
—

 
$
—

 
$
3,202

 
$
(590
)
 
$
3,202

 
$
(590
)
 
 
Exchange-traded funds
—

 
—

 
12,323

 
(294
)
 
12,323

 
(294
)
 
 
Bond mutual funds
—

 
—

 
12,184

 
(999
)
 
12,184

 
(999
)
 
 
Total equity securities
$
—

 
$
—

 
$
27,709

 
$
(1,883
)
 
$
27,709

 
$
(1,883
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

(1)
Effective January 1, 2018, the Company adopted ASU No. 2016-01, which requires equity securities to be measured at fair value with changes in fair value recognized in net income therefore equity securities at fair value are excluded from the table above at December 31, 2018.
MORTGAGE LOANS NET OF VALUATION ALLOWANCE
The following table provides details of the Company's mortgage loans held-for-investment:
 
  
December 31, 2018
 
December 31, 2017
 
 
  
Carrying value
 
% of Total
 
Carrying value
 
% of Total
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage Loans held-for-investment:
 
 
 
 
 
 
 
 
 
Commercial
$
298,650

 
100
%
 
$
325,062

 
100
%
 
 
Total Mortgage Loans held-for-investment
$
298,650

 
100
%
 
$
325,062

 
100
%
 
 
 
 
 
 
 
 
 
 
 
PORTFOLIO OF OTHER INVESTMENTS
The following tables provide a summary of the Company's other investments, together with additional information relating to the liquidity of each category:
 
 
 
 
 
 
 
 
 
 
 
  
Fair value
 
Redemption frequency
(if currently eligible)
 
Redemption
notice period
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2018
 
 
 
 
 
 
 
 
 
Long/short equity funds
$
26,779

 
3
%
 
Annually
 
60 days
 
 
Multi-strategy funds
153,883

 
20
%
 
Quarterly, Semi-annually
 
60-95 days
 
 
Event-driven funds
13,936

 
2
%
 
Annually
 
45 days
 
 
Direct lending funds
274,478

 
35
%
 
n/a
 
n/a
 
 
Private equity funds
64,566

 
8
%
 
n/a
 
n/a
 
 
Real estate funds
84,202

 
11
%
 
n/a
 
n/a
 
 
CLO-Equities
21,271

 
2
%
 
n/a
 
n/a
 
 
Other privately held investments
44,518

 
6
%
 
n/a
 
n/a
 
 
Overseas deposits
104,154

 
13
%
 
n/a
 
n/a
 
 
Total other investments
$
787,787

 
100
%
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2017
 
 
 
 
 
 
 
 
 
Long/short equity funds
$
38,470

 
4
%
 
Annually
 
60 days
 
 
Multi-strategy funds
286,164

 
28
%
 
Quarterly, Semi-annually
 
60-95 days
 
 
Event-driven funds
39,177

 
4
%
 
Annually
 
45 days
 
 
Direct lending funds
250,681

 
25
%
 
n/a
 
n/a
 
 
Private equity funds
68,812

 
7
%
 
n/a
 
n/a
 
 
Real estate funds
50,009

 
5
%
 
n/a
 
n/a
 
 
CLO-Equities
31,413

 
2
%
 
n/a
 
n/a
 
 
Other privately held investments
46,430

 
5
%
 
n/a
 
n/a
 
 
Overseas deposits
198,217

 
20
%
 
n/a
 
n/a
 
 
Total other investments
$
1,009,373

 
100
%
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
n/a – not applicable
NET INVESTMENT INCOME
Net investment income was derived from the following sources:
 
 
 
 
 
 
 
 
 
Year ended December 31,
2018
 
2017
 
2016
 
 
 
 
 
 
 
 
 
 
Fixed maturities
$
356,273

 
$
312,662

 
$
305,459

 
 
Other investments
48,959

 
76,858

 
42,514

 
 
Equity securities
10,077

 
14,919

 
16,306

 
 
Mortgage loans
13,566

 
10,780

 
7,996

 
 
Cash and cash equivalents
27,566

 
10,057

 
9,209

 
 
Short-term investments
9,365

 
2,718

 
2,060

 
 
Gross investment income
465,806

 
427,994

 
383,544

 
 
Investment expenses
(27,299
)
 
(27,189
)
 
(30,209
)
 
 
Net investment income
$
438,507

 
$
400,805

 
$
353,335

 
 
 
 
 
 
 
 
 
NET REALIZED INVESTMENT GAINS (LOSSES)
The following table provides an analysis of net investment gains (losses):
 
 
 
 
 
 
 
 
 
Year ended December 31,
2018
 
2017
 
2016
 
 
 
 
 
 
 
 
 
 
Gross realized investment gains
 
 
 
 
 
 
 
Fixed maturities and short-term investments
$
46,067

 
$
72,046

 
$
86,267

 
 
Equity securities
20,435

 
78,343

 
19,104

 
 
Gross realized investment gains
66,502

 
150,389

 
105,371

 
 
Gross realized investment losses
 
 
 
 
 
 
 
Fixed maturities and short-term investments
(142,153
)
 
(98,442
)
 
(134,460
)
 
 
Equity securities
(3,389
)
 
(959
)
 
(16,155
)
 
 
Gross realized investment losses
(145,542
)
 
(99,401
)
 
(150,615
)
 
 
Net OTTI charge recognized in net income
(9,733
)
 
(14,493
)
 
(26,210
)
 
 
Change in fair value of investment derivatives(1)
5,445

 
(8,269
)
 
10,929

 
 
Change in fair value of equity securities(2)
(66,890
)
 
—

 
—

 
 
Net investment gains (losses)
$
(150,218
)
 
$
28,226

 
$
(60,525
)
 
 
 
 
 
 
 
 
 
(1)
Refer to Note 8 'Derivative Instruments'
(2)
Effective January 1, 2018, the Company adopted ASU No. 2016-01. The change in fair value of equity securities is now recognized in net income.
OTTI RECOGNIZED IN EARNINGS BY ASSET CLASS
The following table summarizes the OTTI charge recognized in net income by asset class:
 
 
 
 
 
 
 
 
 
Year ended December 31,
2018
 
2017
 
2016
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
Non-U.S. government
$
4,697

 
$
8,187

 
$
3,557

 
 
Corporate debt
4,995

 
6,306

 
20,093

 
 
Non-Agency CMBS
41

 
—

 
—

 
 
 
9,733

 
14,493

 
23,650

 
 
Equity Securities
 
 
 
 
 
 
 
Exchange-traded funds
—

 
—

 
2,560

 
 
 
—

 
—

 
2,560

 
 
Total OTTI recognized in net income
$
9,733

 
$
14,493

 
$
26,210

 
 
 
 
 
 
 
 
 
ROLL FORWARD OF CREDIT LOSSES FOR WHICH A PORTION OF OTTI RECOGNIZED IN AOCI
The following table provides a roll forward of credit losses ("credit loss table") before income taxes, for which a component of the OTTI charge was recognized in AOCI:
 
 
 
 
 
 
 
Year ended December 31,
2018
 
2017
 
 
 
 
 
 
 
 
Balance at beginning of period
$
1,494

 
$
1,493

 
 
Credit impairments recognized on securities not previously impaired
—

 
—

 
 
Additional credit impairments recognized on securities previously impaired
8

 
13

 
 
Change in timing of future cash flows on securities previously impaired
—

 
—

 
 
Intent to sell of securities previously impaired
—

 
—

 
 
Securities sold/redeemed/matured
(992
)
 
(12
)
 
 
Balance at end of period
$
510

 
$
1,494

 
 
 
 
 
 
 
RESTRICTED INVESTMENTS
The fair value of the Company's restricted investments and cash primarily relates to these items, as noted in the table below.
 
 
 
 
 
 
 
 
At December 31,
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Collateral in Trust for inter-company agreements
 
$
2,121,522

 
$
3,310,180

 
 
Collateral for secured letter of credit facility
 
470,051

 
386,451

 
 
Funds at Lloyd's
 
1,307,945

 
1,192,717

 
 
Collateral in Trust for third party agreements
 
1,510,416

 
2,085,443

 
 
Securities on deposit with regulatory authorities
 
64,360

 
53,925

 
 
Total restricted investments
 
$
5,474,294

 
$
7,028,716