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Investments In Fixed Maturity Securities
 6 Months Ended
Jun. 30, 2016
Debt Securities [Member]  
Schedule of Marketable Securities [Line Items]  
Investments In Fixed Maturity Securities
Investments in Fixed Maturity Securities
At June 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
 
June 30, 2016
 
 
 
 
 
 
 
 
 
Held to maturity:
 
 
 
 
 
 
 
 
 
State and municipal
$
70,704

 
$
19,312

 
$
—

 
$
90,016

 
$
70,704

Residential mortgage-backed
17,315

 
2,446

 
—

 
19,761

 
17,315

Total held to maturity
88,019

 
21,758

 
—

 
109,777

 
88,019

Available for sale:
 
 
 
 
 
 
 
 
 
U.S. government and government agency
532,492

 
28,680

 
(682
)
 
560,490

 
560,490

State and municipal:
 
 
 
 
 
 
 
 
 
Special revenue
2,595,942

 
141,661

 
(1,038
)
 
2,736,565

 
2,736,565

State general obligation
577,408

 
35,119

 
(987
)
 
611,540

 
611,540

Pre-refunded
448,185

 
36,443

 
—

 
484,628

 
484,628

Corporate backed
387,006

 
17,599

 
(545
)
 
404,060

 
404,060

Local general obligation
343,913

 
35,703

 
—

 
379,616

 
379,616

Total state and municipal
4,352,454

 
266,525

 
(2,570
)
 
4,616,409

 
4,616,409

Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
Residential (1)
1,010,596

 
31,157

 
(3,630
)
 
1,038,123

 
1,038,123

Commercial
97,524

 
970

 
(770
)
 
97,724

 
97,724

Total mortgage-backed securities
1,108,120

 
32,127

 
(4,400
)
 
1,135,847

 
1,135,847

Asset-backed
1,919,279

 
13,333

 
(16,336
)
 
1,916,276

 
1,916,276

Corporate:
 
 
 
 
 
 
 
 
 
Industrial
2,093,170

 
128,048

 
(6,795
)
 
2,214,423

 
2,214,423

Financial
1,196,178

 
50,925

 
(7,565
)
 
1,239,538

 
1,239,538

Utilities
203,145

 
12,391

 
(972
)
 
214,564

 
214,564

Other
70,442

 
584

 
(9
)
 
71,017

 
71,017

Total corporate
3,562,935

 
191,948

 
(15,341
)
 
3,739,542

 
3,739,542

Foreign
836,109

 
66,413

 
(4,183
)
 
898,339

 
898,339

Total available for sale
12,311,389

 
599,026

 
(43,512
)
 
12,866,903

 
12,866,903

Total investments in fixed maturity securities
$
12,399,408

 
$
620,784

 
$
(43,512
)
 
$
12,976,680

 
$
12,954,922

(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 $985,213 and $1,269,491 as of June 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.

The amortized cost and fair value of fixed maturity securities at June 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
$
844,750

 
$
878,691

Due after one year through five years
4,599,884

 
4,784,106

Due after five years through ten years
3,321,186

 
3,544,108

Due after ten years
2,508,153

 
2,614,167

Mortgage-backed securities
1,125,435

 
1,155,608

Total
$
12,399,408

 
$
12,976,680


At June 30, 2016 and 2015, there were no investments that exceeded 10% of common stockholder's equity, other than investments in United States government and government agency securities.