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Investments (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost $ 7,152,127 $ 6,785,626
Amortized Cost/Cost, Equity securities 134,013 95,722
Unrealized Gains 374,991 395,237
Unrealized Losses 70,410 89,523
Fair Value 7,456,708 7,091,340
Fair Value, Equity securities 141,649 99,797
OTTI in AOCI [1] 1,618 (2,758)
Mortgage-backed securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost [2] 412,891 461,862
Unrealized Gains [2] 33,168 44,413
Unrealized Losses [2] 3,640 1,861
Fair Value [2] 442,419 504,414
OTTI in AOCI [1] 0 [2] 0
Other, including U.S. Treasury Securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost [2] 458,745 532,373
Unrealized Gains [2] 18,518 21,153
Unrealized Losses [2] 10,120 7,415
Fair Value [2] 467,143 546,111
OTTI in AOCI [1] 0 [2] 0
Municipal bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 1,648,252 1,553,603
Unrealized Gains 143,733 165,680
Unrealized Losses 22,588 10,340
Fair Value 1,769,397 1,708,943
OTTI in AOCI [1] 0 (4,140)
Foreign government bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 93,864 67,441
Unrealized Gains 5,102 6,288
Unrealized Losses 297 112
Fair Value 98,669 73,617
OTTI in AOCI [1] 0 0
Corporate bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 2,672,818 2,687,376
Unrealized Gains 152,229 140,873
Unrealized Losses 14,826 48,834
Fair Value 2,810,221 2,779,415
OTTI in AOCI [1] 0 0
Other mortgage-backed securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost 1,865,557 1,482,971
Unrealized Gains 22,241 16,830
Unrealized Losses 18,939 20,961
Fair Value 1,868,859 1,478,840
OTTI in AOCI [1] 1,618 1,382
Equity securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost/Cost, Equity securities [3] 134,013 95,722
Unrealized Gains [3] 13,210 8,405
Unrealized Losses [3] 5,574 4,330
Fair Value, Equity securities [3] 141,649 99,797
OTTI in AOCI [1] $ 0 [3] $ 0
[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 net unrealized investment gains and 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 $196,468 and $231,294; Federal Home Loan Mortgage Corporation (“FHLMC”) of $284,050 and $363,957; and Government National Mortgage Association (“GNMA”) of $115,627 and $130,940 as of December 31, 2016 and 2015, respectively.
[3] Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.