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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Schedule of amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of fixed-maturity securities |  |
Fixed maturity securities amortized cost | $ 341,203 | $ 298,978
Total fixed-maturity securities, Gross Unrealized Gains | 6,802 | 6,442
Total fixed-maturity securities, Gross Unrealized Losses | (438) | (1,375)
Total fixed-maturity securities, Estimated Fair Value | 347,567 | 304,045
Less total unrestricted fixed-maturity securities Amortized Cost | 63,567 | 5,348
Less total unrestricted fixed-maturity securities, Gross unrealized gains | 377 | 151
Less total unrestricted fixed-maturity securities, Gross unrealized losses | (53) | (9)
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 63,891 | 5,490
Total fixed-maturity securities held in trust, Amortized Cost | 277,636 | 293,630
Total fixed-maturity securities held in trust, Gross Unrealized Gains | 6,425 | 6,291
Total fixed-maturity securities held in trust, Gross Unrealized Losses | (385) | (1,366)
Total fixed-maturity securities held in trust, Estimated Fair Value | 283,676 | 298,555
U.S. Treasury securities [Member] |  |
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of fixed-maturity securities |  |
Fixed maturity securities amortized cost | 250 | 250
Total fixed-maturity securities, Estimated Fair Value | 250 | 250
Obligations of U.S. government sponsored enterprises [Member] |  |
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of fixed-maturity securities |  |
Fixed maturity securities amortized cost | 128,886 | 122,874
Total fixed-maturity securities, Gross Unrealized Gains | 1,935 | 2,029
Total fixed-maturity securities, Gross Unrealized Losses | (147) | (267)
Total fixed-maturity securities, Estimated Fair Value | 130,674 | 124,636
Corporate debt securities [Member] |  |
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of fixed-maturity securities |  |
Fixed maturity securities amortized cost | 129,447 | 129,916
Total fixed-maturity securities, Gross Unrealized Gains | 4,224 | 3,791
Total fixed-maturity securities, Gross Unrealized Losses | (135) | (845)
Total fixed-maturity securities, Estimated Fair Value | 133,536 | 132,862
Commercial Paper [Member] |  |
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of fixed-maturity securities |  |
Fixed maturity securities amortized cost | 29,966 |
Total fixed-maturity securities, Gross Unrealized Gains | 7 |
Total fixed-maturity securities, Gross Unrealized Losses | (3) |
Total fixed-maturity securities, Estimated Fair Value | 29,970 |
Foreign corporate debt securities [Member] |  |
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of fixed-maturity securities |  |
Fixed maturity securities amortized cost | 33,045 | 26,800
Total fixed-maturity securities, Gross Unrealized Gains | 560 | 546
Total fixed-maturity securities, Gross Unrealized Losses | (25) | (117)
Total fixed-maturity securities, Estimated Fair Value | 33,580 | 27,229
Commercial mortgage-backed securities [Member] |  |
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of fixed-maturity securities |  |
Fixed maturity securities amortized cost | 19,609 | 19,138
Total fixed-maturity securities, Gross Unrealized Gains | 76 | 76
Total fixed-maturity securities, Gross Unrealized Losses | (128) | (146)
Total fixed-maturity securities, Estimated Fair Value | $ 19,557 | $ 19,068

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