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Investments (Details 1) $ in Thousands | Mar. 31, 2017 USD ($) Number | Dec. 31, 2016 USD ($) Number
--- | --- | ---
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | $ 1,526,737 | $ 1,994,925
Fixed maturity securities, Fair Value, More than 12 Months |  | 247,925 | 307,486
Fixed maturity securities, Fair Value, Total |  | 1,774,662 | 2,302,411
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 45,629 | 61,692
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 11,113 | 14,292
Fixed maturity securities, Gross Unrealized Losses, Total |  | $ 56,742 | $ 75,984
Number of positions with a gross unrealized loss, 12 Months or Less | Number |  | 560 | 629
Number of position with a gross unrealized loss, more than 12 months | Number |  | 91 | 102
Number of position with a gross unrealized loss, Total | Number |  | 651 | 731
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less |  | 19.90% | 26.30%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months |  | 3.20% | 4.00%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total |  | 23.10% | 30.30%
Mortgage-backed securities [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | $ 169,786 | $ 186,439
Fixed maturity securities, Fair Value, More than 12 Months |  | 3,381 | 3,235
Fixed maturity securities, Fair Value, Total |  | 173,167 | 189,674
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 5,035 | 6,176
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 408 | 544
Fixed maturity securities, Gross Unrealized Losses, Total |  | 5,443 | 6,720
Other [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 262,517 | 219,372
Fixed maturity securities, Fair Value, More than 12 Months |  | 0 | 0
Fixed maturity securities, Fair Value, Total |  | 262,517 | 219,372
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 9,219 | 10,120
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total |  | 9,219 | 10,120
Municipal bonds [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 325,610 | 408,163
Fixed maturity securities, Fair Value, More than 12 Months |  | 10,082 | 9,928
Fixed maturity securities, Fair Value, Total |  | 335,692 | 418,091
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 14,754 | 19,006
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 3,452 | 3,582
Fixed maturity securities, Gross Unrealized Losses, Total |  | 18,206 | 22,588
Foreign government bonds [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 1,444 | 24,182
Fixed maturity securities, Fair Value, More than 12 Months |  | 0 | 0
Fixed maturity securities, Fair Value, Total |  | 1,444 | 24,182
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 56 | 297
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total |  | 56 | 297
Corporate bonds [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 285,724 | 459,402
Fixed maturity securities, Fair Value, More than 12 Months |  | 37,490 | 57,261
Fixed maturity securities, Fair Value, Total |  | 323,214 | 516,663
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 6,492 | 11,056
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 2,683 | 3,770
Fixed maturity securities, Gross Unrealized Losses, Total |  | 9,175 | 14,826
Other mortgage-backed securities [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 444,102 | 640,691
Fixed maturity securities, Fair Value, More than 12 Months |  | 188,904 | 229,106
Fixed maturity securities, Fair Value, Total |  | 633,006 | 869,797
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 9,060 | 10,470
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 3,612 | 5,389
Fixed maturity securities, Gross Unrealized Losses, Total |  | 12,672 | 15,859
Total fixed maturity securities [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 1,489,183 | 1,938,249
Fixed maturity securities, Fair Value, More than 12 Months |  | 239,857 | 299,530
Fixed maturity securities, Fair Value, Total |  | 1,729,040 | 2,237,779
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 44,616 | 57,125
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 10,155 | 13,285
Fixed maturity securities, Gross Unrealized Losses, Total |  | 54,771 | 70,410
Equity securities [Member] |  |  |
Fixed maturity securities, Fair Value |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | [1] | 37,554 | 56,676
Fixed maturity securities, Fair Value, More than 12 Months | [1] | 8,068 | 7,956
Fixed maturity securities, Fair Value, Total | [1] | 45,622 | 64,632
Fixed maturity securities, Gross Unrealized Losses |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | [1] | 1,013 | 4,567
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | [1] | 958 | 1,007
Fixed maturity securities, Gross Unrealized Losses, Total | [1] | $ 1,971 | $ 5,574
[1] | Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.

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