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Investments (Details 1) $ in Thousands | Mar. 31, 2016 USD ($) Number | Dec. 31, 2015 USD ($) Number
--- | --- | ---
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | $ 1,383,241 | $ 2,304,060
Fixed maturity securities, Fair Value, More than 12 Months |  | 263,846 | 224,513
Fixed maturity securities, Fair Value, Total |  | 1,647,087 | 2,528,573
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 47,633 | 74,011
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 20,065 | 19,842
Fixed maturity securities, Gross Unrealized Losses, Total |  | $ 67,698 | $ 93,853
Number of positions with a gross unrealized loss position, 12 Months or Less | Number |  | 421 | 684
Number of position with a gross unrealized loss position, more than 12 months | Number |  | 93 | 78
Number of position with a gross unrealized loss position, Total | Number |  | 514 | 762
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less |  | 18.90% | 32.00%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months |  | 3.60% | 3.10%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total |  | 22.50% | 35.10%
Mortgage-backed securities [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | $ 3,919 | $ 48,097
Fixed maturity securities, Fair Value, More than 12 Months |  | 2,918 | 1,595
Fixed maturity securities, Fair Value, Total |  | 6,837 | 49,692
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 188 | 1,748
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 283 | 113
Fixed maturity securities, Gross Unrealized Losses, Total |  | 471 | 1,861
Other [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 10,000 | 248,478
Fixed maturity securities, Fair Value, More than 12 Months |  | 0 | 1,921
Fixed maturity securities, Fair Value, Total |  | 10,000 | 250,399
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 0 | 7,338
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 0 | 77
Fixed maturity securities, Gross Unrealized Losses, Total |  | 0 | 7,415
Municipal bonds [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 37,752 | 168,939
Fixed maturity securities, Fair Value, More than 12 Months |  | 12,324 | 21,717
Fixed maturity securities, Fair Value, Total |  | 50,076 | 190,656
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 4,056 | 5,382
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 3,143 | 4,958
Fixed maturity securities, Gross Unrealized Losses, Total |  | 7,199 | 10,340
Foreign government bonds [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 0 | 11,867
Fixed maturity securities, Fair Value, More than 12 Months |  | 0 | 0
Fixed maturity securities, Fair Value, Total |  | 0 | 11,867
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 0 | 112
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total |  | 0 | 112
Corporate bonds [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 435,489 | 858,647
Fixed maturity securities, Fair Value, More than 12 Months |  | 64,934 | 50,340
Fixed maturity securities, Fair Value, Total |  | 500,423 | 908,987
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 16,822 | 37,244
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 11,521 | 11,590
Fixed maturity securities, Gross Unrealized Losses, Total |  | 28,343 | 48,834
Other mortgage-backed securities [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 884,292 | 929,268
Fixed maturity securities, Fair Value, More than 12 Months |  | 174,345 | 140,561
Fixed maturity securities, Fair Value, Total |  | 1,058,637 | 1,069,829
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 24,692 | 19,165
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 3,895 | 1,796
Fixed maturity securities, Gross Unrealized Losses, Total |  | 28,587 | 20,961
Total fixed maturity securities [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 1,371,452 | 2,265,296
Fixed maturity securities, Fair Value, More than 12 Months |  | 254,521 | 216,134
Fixed maturity securities, Fair Value, Total |  | 1,625,973 | 2,481,430
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 45,758 | 70,989
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 18,842 | 18,534
Fixed maturity securities, Gross Unrealized Losses, Total |  | 64,600 | 89,523
Equity securities [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | [1] | 11,789 | 38,764
Fixed maturity securities, Fair Value, More than 12 Months | [1] | 9,325 | 8,379
Fixed maturity securities, Fair Value, Total | [1] | 21,114 | 47,143
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | [1] | 1,875 | 3,022
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | [1] | 1,223 | 1,308
Fixed maturity securities, Gross Unrealized Losses, Total | [1] | $ 3,098 | $ 4,330
[1] | Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.

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