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Investments (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost $ 6,907,575 $ 6,785,626
Unrealized Gains 608,188 395,237
Unrealized Losses 21,710 89,523
Fair Value 7,494,053 7,091,340
OTTI in AOCI [1] (539) (2,758)
Amortized Cost/Cost, Equity securities 124,806 95,722
Fair Value, Equity securities 137,640 99,797
Mortgage-backed securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost [2] 419,651 461,862
Unrealized Gains [2] 52,772 44,413
Unrealized Losses [2] 267 1,861
Fair Value [2] 472,156 504,414
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] 449,016 532,373
Unrealized Gains [2] 39,383 21,153
Unrealized Losses [2] 272 7,415
Fair Value [2] 488,127 546,111
OTTI in AOCI [1],[2] 0 0
Municipal bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 1,555,326 1,553,603
Unrealized Gains 228,185 165,680
Unrealized Losses 4,770 10,340
Fair Value 1,778,741 1,708,943
OTTI in AOCI [1] (1,899) (4,140)
Foreign government bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 71,402 67,441
Unrealized Gains 8,437 6,288
Unrealized Losses 0 112
Fair Value 79,839 73,617
OTTI in AOCI [1] 0 0
Corporate bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 2,720,987 2,687,376
Unrealized Gains 239,109 140,873
Unrealized Losses 6,758 48,834
Fair Value 2,953,338 2,779,415
OTTI in AOCI [1] (340) 0
Other mortgage-backed securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 1,691,193 1,482,971
Unrealized Gains 40,302 16,830
Unrealized Losses 9,643 20,961
Fair Value 1,721,852 1,478,840
OTTI in AOCI [1] 1,700 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] 124,806 95,722
Unrealized Gains, Equity securities [3] 14,355 8,405
Unrealized Losses, Equity securities [3] 1,521 4,330
Fair Value, Equity securities [3] $ 137,640 $ 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 $203,381 and $231,294; Federal Home Loan Mortgage Corporation (“FHLMC”) of $302,472 and $363,957; and Government National Mortgage Association (“GNMA”) of $122,311 and $130,940 as of September 30, 2016 and December 31, 2015, respectively.
[3] Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.