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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.

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