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Investments (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost $ 6,910,241 $ 6,785,626
Unrealized Gains 606,956 395,237
Unrealized Losses 35,485 89,523
Fair Value 7,481,712 7,091,340
OTTI in AOCI [1] (507) (2,758)
Amortized Cost/Cost, Equity securities 110,573 95,722
Fair Value, Equity securities 123,163 99,797
Mortgage-backed securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost [2] 451,983 461,862
Unrealized Gains [2] 58,547 44,413
Unrealized Losses [2] 226 1,861
Fair Value [2] 510,304 504,414
OTTI in AOCI [1],[2] 0 0
Other, including U.S. Treasury Securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost [2] 506,240 532,373
Unrealized Gains [2] 42,328 21,153
Unrealized Losses [2] 56 7,415
Fair Value [2] 548,512 546,111
OTTI in AOCI [1],[2] 0 0
Municipal bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 1,509,321 1,553,603
Unrealized Gains 241,327 165,680
Unrealized Losses 4,884 10,340
Fair Value 1,745,764 1,708,943
OTTI in AOCI [1] (1,988) (4,140)
Foreign government bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 71,421 67,441
Unrealized Gains 7,673 6,288
Unrealized Losses 0 112
Fair Value 79,094 73,617
OTTI in AOCI [1] 0 0
Corporate bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 2,672,912 2,687,376
Unrealized Gains 225,571 140,873
Unrealized Losses 11,297 48,834
Fair Value 2,887,186 2,779,415
OTTI in AOCI [1] (290) 0
Other mortgage-backed securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 1,698,364 1,482,971
Unrealized Gains 31,510 16,830
Unrealized Losses 19,022 20,961
Fair Value 1,710,852 1,478,840
OTTI in AOCI [1] 1,771 1,382
Equity securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
OTTI in AOCI [1],[3] 0 0
Amortized Cost/Cost, Equity securities [3] 110,573 95,722
Unrealized Gains, Equity securities [3] 14,009 8,405
Unrealized Losses, Equity securities [3] 1,419 4,330
Fair Value, Equity securities [3] $ 123,163 $ 99,797
[1] Related to securities for which an unrealized loss was bifurcated to distinguish the credit-related portion and the portion driven by other market factors. Represents the amount of other-than-temporary impairment losses in AOCI which was not included in earnings; amounts also include unrealized gains/(losses) on such impaired securities relating to changes in the fair value of those securities subsequent to the impairment measurement date.
[2] Fair value includes securities issued by Federal National Mortgage Association (“FNMA”) of $241,889 and $231,294; Federal Home Loan Mortgage Corporation (“FHLMC”) of $331,300 and $363,957; and Government National Mortgage Association (“GNMA”) of $127,804 and $130,940 as of June 30, 2016 and December 31, 2015, respectively.
[3] Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.