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Investments (Details ) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 Positions | Dec. 31, 2012 Positions
--- | --- | ---
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | $ 406,101 | $ 263,571
Fixed maturity securities, Fair Value More than 12 Months | 67,924 | 55,788
Fixed maturity securities, Fair Value, Total | 474,025 | 319,359
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 6,742 | 5,648
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 5,860 | 5,532
Fixed maturity securities, Gross Unrealized Losses, Total | 12,602 | 11,180
Number of positions with a gross unrealized loss 12 months or less | 138 | 156
Number of position with gross unrealized loss position more than 12 months | 41 | 43
Number of position with gross unrealized loss position, Total | 179 | 199
Fair value as percentage of total fixed maturities and equity securities fair value less than 12 months | 6.50% | 4.40%
Fair value as percentage of total fixed maturities and equity securities fair value more than 12 months | 1.10% | 0.90%
Fair value as percentage of total fixed maturities and equity securities fair value, Total | 7.60% | 5.30%
Mortgage-backed securities [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 11,913 | 11,006
Fixed maturity securities, Fair Value More than 12 Months | 48 | 50
Fixed maturity securities, Fair Value, Total | 11,961 | 11,056
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 438 | 124
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 1 | 1
Fixed maturity securities, Gross Unrealized Losses, Total | 439 | 125
Other [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 33,825 | 9,944
Fixed maturity securities, Fair Value, Total | 33,825 | 9,944
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 658 | 135
Fixed maturity securities, Gross Unrealized Losses, Total | 658 | 135
Municipal bonds [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 134,086 | 108,578
Fixed maturity securities, Fair Value More than 12 Months | 14,908 | 3,990
Fixed maturity securities, Fair Value, Total | 148,994 | 112,568
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 3,555 | 2,605
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 507 | 43
Fixed maturity securities, Gross Unrealized Losses, Total | 4,062 | 2,648
Foreign government bonds [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 1,966 |
Fixed maturity securities, Fair Value, Total | 1,966 |
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 17 |
Fixed maturity securities, Gross Unrealized Losses, Total | 17 |
Corporate bonds [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 100,923 | 56,481
Fixed maturity securities, Fair Value More than 12 Months | 22,637 | 26,725
Fixed maturity securities, Fair Value, Total | 123,560 | 83,206
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 678 | 875
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 3,526 | 4,075
Fixed maturity securities, Gross Unrealized Losses, Total | 4,204 | 4,950
Other mortgage-backed securities [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 118,824 | 58,218
Fixed maturity securities, Fair Value More than 12 Months | 29,298 | 25,014
Fixed maturity securities, Fair Value, Total | 148,122 | 83,232
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 1,113 | 621
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 1,402 | 1,411
Fixed maturity securities, Gross Unrealized Losses, Total | 2,515 | 2,032
Total fixed maturities securities [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 401,537 | 244,227
Fixed maturity securities, Fair Value More than 12 Months | 66,891 | 55,779
Fixed maturity securities, Fair Value, Total | 468,428 | 300,006
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 6,459 | 4,360
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 5,436 | 5,530
Fixed maturity securities, Gross Unrealized Losses, Total | 11,895 | 9,890
Equity securities [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 4,564 | 19,344
Fixed maturity securities, Fair Value More than 12 Months | 1,033 | 9
Fixed maturity securities, Fair Value, Total | 5,597 | 19,353
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 283 | 1,288
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 424 | 2
Fixed maturity securities, Gross Unrealized Losses, Total | $ 707 | $ 1,290

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