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Investments In Fixed Maturity Securities (Tables) - Debt Securities
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Schedule of Marketable Securities [Line Items]    
Investments In Fixed Maturity Securities
At December 31, 2015 and 2014, investments in fixed maturity securities were as follows:
(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

Corporate
—

 
—

 
—

 
—

 
—

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 securities
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



(In thousands)
Amortized
Cost
 
Gross Unrealized
 
Fair
Value
 
Carrying
Value
Gains
 
Losses
December 31, 2014
 
 
 
 
 
 
 
 
 
Held to maturity:
 
 
 
 
 
 
 
 
 
State and municipal
$
72,901

 
$
17,501

 
$
—

 
$
90,402

 
$
72,901

Residential mortgage-backed
23,278

 
2,854

 
—

 
26,132

 
23,278

Corporate
4,998

 
291

 
—

 
5,289

 
4,998

Total held to maturity
101,177

 
20,646

 
—

 
121,823

 
101,177

Available for sale:
 
 
 
 
 
 
 
 
 
U.S. government and government agency
773,192

 
33,353

 
(3,157
)
 
803,388

 
803,388

State and municipal:
 
 
 
 
 
 


 


                 Special revenue
2,264,210

 
111,841

 
(2,084
)
 
2,373,967

 
2,373,967

                 State general obligation
674,022

 
37,615

 
(787
)
 
710,850

 
710,850

                 Pre-refunded
504,778

 
35,619

 
(289
)
 
540,108

 
540,108

                 Corporate backed
413,234

 
18,976

 
(855
)
 
431,355

 
431,355

                 Local general obligation
281,622

 
25,099

 
(5
)
 
306,716

 
306,716

       Total state and municipal
4,137,866

 
229,150

 
(4,020
)
 
4,362,996

 
4,362,996

Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
Residential (1)
1,201,924

 
27,124

 
(9,449
)
 
1,219,599

 
1,219,599

Commercial
74,479

 
1,610

 
(52
)
 
76,037

 
76,037

Total mortgage-backed securities
1,276,403

 
28,734

 
(9,501
)
 
1,295,636

 
1,295,636

Asset-backed securities
2,019,032

 
18,868

 
(11,974
)
 
2,025,926

 
2,025,926

Corporate:
 
 
 
 


 
 
 
 
                 Industrial
1,606,724

 
117,206

 
(5,131
)
 
1,718,799

 
1,718,799

                 Financial
1,140,801

 
38,080

 
(7,673
)
 
1,171,208

 
1,171,208

                 Utilities
184,107

 
12,436

 
(1
)
 
196,542

 
196,542

                 Other
86,294

 
1,370

 
(2
)
 
87,662

 
87,662

Total corporate
3,017,926

 
169,092

 
(12,807
)
 
3,174,211

 
3,174,211

Foreign
897,668

 
62,223

 
(18,065
)
 
941,826

 
941,826

Total available for sale
12,122,087

 
541,420

 
(59,524
)
 
12,603,983

 
12,603,983

Total investments in fixed maturity securities
$
12,223,264

 
$
562,066

 
$
(59,524
)
 
$
12,725,806

 
$
12,705,160


(1)
Gross unrealized losses for mortgage-backed securities include $1,269,491 and $1,095,671, as of December 31, 2015 and 2014, respectively, related to the non-credit portion of OTTI recognized in other comprehensive income.
  
The Amortized Cost And Fair Value of Fixed Maturity Securities  
The amortized cost and fair value of fixed maturity securities at December 31, 2015, 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
$
711,642

 
$
717,075

Due after one year through five years
4,056,450

 
4,185,436

Due after five years through ten years
3,653,308

 
3,795,614

Due after ten years
2,476,413

 
2,543,518

Mortgage-backed securities
1,210,495

 
1,221,204

Total
$
12,108,308

 
$
12,462,847