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Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost/Cost |  | $ 6,791,301 | $ 6,785,626
Unrealized Gains |  | 489,801 | 395,237
Unrealized Losses |  | 64,600 | 89,523
Fair Value |  | 7,216,502 | 7,091,340
OTTI in AOCI | [1] | (1,460) | (2,758)
Amortized Cost/Cost, Equity securities |  | 96,305 | 95,722
Fair Value, Equity securities |  | 104,044 | 99,797
Mortgage-backed securities [Member] |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost/Cost | [2] | 441,038 | 461,862
Unrealized Gains | [2] | 54,633 | 44,413
Unrealized Losses | [2] | 471 | 1,861
Fair Value | [2] | 495,200 | 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] | 508,042 | 532,373
Unrealized Gains | [2] | 32,078 | 21,153
Unrealized Losses | [2] | 0 | 7,415
Fair Value | [2] | 540,120 | 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 |  | 1,536,111 | 1,553,603
Unrealized Gains |  | 198,416 | 165,680
Unrealized Losses |  | 7,199 | 10,340
Fair Value |  | 1,727,328 | 1,708,943
OTTI in AOCI | [1] | (2,724) | (4,140)
Foreign government bonds [Member] |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost/Cost |  | 67,422 | 67,441
Unrealized Gains |  | 6,665 | 6,288
Unrealized Losses |  | 0 | 112
Fair Value |  | 74,087 | 73,617
OTTI in AOCI | [1] | 0 | 0
Corporate bonds [Member] |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost/Cost |  | 2,684,520 | 2,687,376
Unrealized Gains |  | 177,754 | 140,873
Unrealized Losses |  | 28,343 | 48,834
Fair Value |  | 2,833,931 | 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 |  | 1,554,168 | 1,482,971
Unrealized Gains |  | 20,255 | 16,830
Unrealized Losses |  | 28,587 | 20,961
Fair Value |  | 1,545,836 | 1,478,840
OTTI in AOCI | [1] | 1,264 | 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] | 96,305 | 95,722
Unrealized Gains, Equity securities | [3] | 10,837 | 8,405
Unrealized Losses, Equity securities | [3] | 3,098 | 4,330
Fair Value, Equity securities | [3] | $ 104,044 | $ 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 $234,668 and $231,294; Federal Home Loan Mortgage Corporation (“FHLMC”) of $342,877 and $363,957; and Government National Mortgage Association (“GNMA”) of $126,252 and $130,940 as of March 31, 2016 and December 31, 2015, respectively.
[3] | Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.

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