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Investments (Details 5) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 Positions | Dec. 31, 2011 Positions
--- | --- | ---
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | $ 108,004 | $ 416,761
Fixed maturity securities, Fair Value More than 12 Months | 74,517 | 89,606
Fixed maturity securities, Fair Value, Total | 182,521 | 506,367
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 3,227 | 13,377
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 7,363 | 20,002
Fixed maturity securities, Gross Unrealized Losses, Total | 10,590 | 33,379
Number of positions with a gross unrealized loss, 12 Months or less | 100 | 159
Number of positions with a gross unrealized loss, More Than 12 Months | 43 | 44
Number of positions with a gross unrealized loss, Fair Value | 143 | 203
Fair value as percentage of total fixed maturities and equity securities fair value for 12 Months or Less | 1.90% | 7.70%
Fair value as percentage of total fixed maturities and equity securities fair value for More Than 12 Months | 1.30% | 1.60%
Fair value as percentage of total fixed maturities and equity securities fair value | 3.10% | 9.30%
Mortgage-backed securities [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 1,562 | 3,519
Fixed maturity securities, Fair Value More than 12 Months | 13 | 1,511
Fixed maturity securities, Fair Value, Total | 1,575 | 5,030
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 8 | 133
Fixed maturity securities, Gross Unrealized Losses More than 12 Months |  | 11
Fixed maturity securities, Gross Unrealized Losses, Total | 8 | 144
Other [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 6,985 |
Fixed maturity securities, Fair Value, Total | 6,985 |
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 1 |
Fixed maturity securities, Gross Unrealized Losses, Total | 1 |
Municipal bonds [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 30,205 | 24,047
Fixed maturity securities, Fair Value More than 12 Months | 3,774 | 19,309
Fixed maturity securities, Fair Value, Total | 33,979 | 43,356
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 1,021 | 270
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 259 | 750
Fixed maturity securities, Gross Unrealized Losses, Total | 1,280 | 1,020
Foreign government bonds [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less |  |
Fixed maturity securities, Fair Value More than 12 Months |  |
Fixed maturity securities, Fair Value, Total |  |
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less |  |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months |  |
Fixed maturity securities, Gross Unrealized Losses, Total |  |
Corporate bonds [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 41,129 | 273,209
Fixed maturity securities, Fair Value More than 12 Months | 36,004 | 26,977
Fixed maturity securities, Fair Value, Total | 77,133 | 300,186
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 1,098 | 9,752
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 5,261 | 6,346
Fixed maturity securities, Gross Unrealized Losses, Total | 6,359 | 16,098
Other mortgage-backed securities [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 22,046 | 115,986
Fixed maturity securities, Fair Value More than 12 Months | 34,712 | 36,944
Fixed maturity securities, Fair Value, Total | 56,758 | 152,930
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 347 | 3,222
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 1,841 | 12,569
Fixed maturity securities, Gross Unrealized Losses, Total | 2,188 | 15,791
Total Fixed Maturities Securities [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 101,927 | 416,761
Fixed maturity securities, Fair Value More than 12 Months | 74,503 | 84,741
Fixed maturity securities, Fair Value, Total | 176,430 | 501,502
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 2,475 | 13,377
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 7,361 | 19,676
Fixed maturity securities, Gross Unrealized Losses, Total | 9,836 | 33,053
Equity Securities [Member] |  |
Fixed maturity securities Fair Value |  |
Fixed maturity securities, Fair Value 12 Months or Less | 6,077 |
Fixed maturity securities, Fair Value More than 12 Months | 14 | 4,865
Fixed maturity securities, Fair Value, Total | 6,091 | 4,865
Fixed maturity securities Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 752 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 2 | 326
Fixed maturity securities, Gross Unrealized Losses, Total | $ 754 | $ 326

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