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Investments In Fixed Maturity Securities Investments in Fixed Maturity Securities (Tables)
 9 Months Ended
Sep. 30, 2016
Schedule of Marketable Securities [Line Items]  
Amortized cost and fair value of fixed maturity securities by contractual maturity
The amortized cost and fair value of fixed maturity securities at September 30, 2016, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations. 
(In thousands)
Amortized
Cost
 
Fair Value
Due in one year or less
$
1,032,042

 
$
1,054,113

Due after one year through five years
5,068,197

 
5,246,081

Due after five years through ten years
3,287,833

 
3,500,463

Due after ten years
2,462,938

 
2,553,828

Mortgage-backed securities
1,257,042

 
1,281,806

Total
$
13,108,052

 
$
13,636,291
Debt Securities [Member]  
Schedule of Marketable Securities [Line Items]  
Schedule of investments in fixed maturity securities
At September 30, 2016 and December 31, 2015, investments in fixed maturity securities were as follows:
 
(In thousands)
Amortized
Cost
 
Gross Unrealized
 
Fair
Value
 
Carrying
Value
Gains
 
Losses
 
September 30, 2016
 
 
 
 
 
 
 
 
 
Held to maturity:
 
 
 
 
 
 
 
 
 
State and municipal
$
71,608

 
$
17,388

 
$
—

 
$
88,996

 
$
71,608

Residential mortgage-backed
16,569

 
2,232

 
—

 
18,801

 
16,569

Total held to maturity
88,177

 
19,620

 
—

 
107,797

 
88,177

Available for sale:
 
 
 
 
 
 
 
 
 
U.S. government and government agency
530,541

 
25,383

 
(931
)
 
554,993

 
554,993

State and municipal:
 
 
 
 
 
 
 
 
 
Special revenue
2,707,492

 
124,159

 
(1,767
)
 
2,829,884

 
2,829,884

State general obligation
528,380

 
33,688

 
(560
)
 
561,508

 
561,508

Pre-refunded
366,360

 
31,900

 
(9
)
 
398,251

 
398,251

Corporate backed
374,355

 
15,424

 
(235
)
 
389,544

 
389,544

Local general obligation
350,349

 
32,193

 
(14
)
 
382,528

 
382,528

Total state and municipal
4,326,936

 
237,364

 
(2,585
)
 
4,561,715

 
4,561,715

Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
Residential (1)
1,131,545

 
27,275

 
(4,859
)
 
1,153,961

 
1,153,961

Commercial
108,928

 
1,032

 
(916
)
 
109,044

 
109,044

Total mortgage-backed securities
1,240,473

 
28,307

 
(5,775
)
 
1,263,005

 
1,263,005

Asset-backed
2,265,206

 
15,729

 
(12,074
)
 
2,268,861

 
2,268,861

Corporate:
 
 
 
 
 
 
 
 
 
Industrial
2,168,312

 
111,260

 
(3,692
)
 
2,275,880

 
2,275,880

Financial
1,288,472

 
52,419

 
(5,384
)
 
1,335,507

 
1,335,507

Utilities
199,941

 
11,593

 
(785
)
 
210,749

 
210,749

Other
90,229

 
1,816

 
(13
)
 
92,032

 
92,032

Total corporate
3,746,954

 
177,088

 
(9,874
)
 
3,914,168

 
3,914,168

Foreign
909,765

 
58,477

 
(2,490
)
 
965,752

 
965,752

Total available for sale
13,019,875

 
542,348

 
(33,729
)
 
13,528,494

 
13,528,494

Total investments in fixed maturity securities
$
13,108,052

 
$
561,968

 
$
(33,729
)
 
$
13,636,291

 
$
13,616,671

(In thousands)
Amortized
Cost
 
Gross Unrealized
 
Fair
Value
 
Carrying
Value
Gains
 
Losses
December 31, 2015
 
 
 
 
 
 
 
 
 
Held to maturity:
 
 
 
 
 
 
 
 
 
State and municipal
$
77,129

 
$
16,246

 
$
—

 
$
93,375

 
$
77,129

Residential mortgage-backed
19,138

 
2,207

 
—

 
21,345

 
19,138

Total held to maturity
96,267

 
18,453

 
—

 
114,720

 
96,267

Available for sale:
 
 
 
 
 
 
 
 
 
U.S. government and government agency
645,092

 
27,660

 
(2,333
)
 
670,419

 
670,419

State and municipal:
 
 
 
 
 
 
 
 
 
Special revenue
2,510,816

 
102,909

 
(3,737
)
 
2,609,988

 
2,609,988

State general obligation
583,456

 
28,068

 
(2,070
)
 
609,454

 
609,454

Pre-refunded
439,772

 
32,056

 
(31
)
 
471,797

 
471,797

Corporate backed
388,904

 
14,039

 
(402
)
 
402,541

 
402,541

Local general obligation
342,158

 
24,270

 
(29
)
 
366,399

 
366,399

Total state and municipal
4,265,106

 
201,342

 
(6,269
)
 
4,460,179

 
4,460,179

Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
Residential (1)
1,126,382

 
18,935

 
(11,180
)
 
1,134,137

 
1,134,137

Commercial
64,975

 
875

 
(128
)
 
65,722

 
65,722

Total mortgage-backed securities
1,191,357

 
19,810

 
(11,308
)
 
1,199,859

 
1,199,859

Asset-backed
1,706,694

 
12,892

 
(14,414
)
 
1,705,172

 
1,705,172

Corporate:
 
 
 
 
 
 
 
 
 
Industrial
1,976,393

 
75,168

 
(30,027
)
 
2,021,534

 
2,021,534

Financial
1,153,096

 
31,744

 
(11,819
)
 
1,173,021

 
1,173,021

Utilities
192,857

 
8,321

 
(2,527
)
 
198,651

 
198,651

Other
81,607

 
245

 
(20
)
 
81,832

 
81,832

Total corporate
3,403,953

 
115,478

 
(44,393
)
 
3,475,038

 
3,475,038

Foreign
799,839

 
50,310

 
(12,689
)
 
837,460

 
837,460

Total available for sale
12,012,041

 
427,492

 
(91,406
)
 
12,348,127

 
12,348,127

Total investments in fixed maturity securities
$
12,108,308


$
445,945

 
$
(91,406
)
 
$
12,462,847

 
$
12,444,394

____________
(1)
Gross unrealized losses for residential mortgage-backed securities include $857,252 and $1,269,491 as of September 30, 2016 and December 31, 2015, respectively, related to the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income.