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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.

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