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Investments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Positions	Dec. 31, 2011 Positions
Fixed maturity securities Fair Value
Fixed maturity securities, Fair Value 12 Months or Less	$ 263,571	$ 416,761
Fixed maturity securities, Fair Value More than 12 Months	55,788	89,606
Fixed maturity securities, Fair Value, Total	319,359	506,367
Fixed maturity securities Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less	5,648	13,377
Fixed maturity securities, Gross Unrealized Losses More than 12 Months	5,532	20,002
Fixed maturity securities, Gross Unrealized Losses, Total	11,180	33,379
Number of positions with a gross unrealized loss 12 months or less	156	159
Number of position with gross unrealized loss position more than 12 months	43	44
Number of position with gross unrealized loss position, Total	199	203
Fair value as percentage of fixed maturities and equity securities fair value less than 12 months	4.40%	7.70%
Fair value as percentage of fixed maturities and equity securities fair value more than 12 months	0.90%	1.60%
Fair value as percentage of fixed maturities and equity securities fair value, Total	5.30%	9.30%
Mortgage-backed securities [Member]
Fixed maturity securities Fair Value
Fixed maturity securities, Fair Value 12 Months or Less	11,006	3,519
Fixed maturity securities, Fair Value More than 12 Months	50	1,511
Fixed maturity securities, Fair Value, Total	11,056	5,030
Fixed maturity securities Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less	124	133
Fixed maturity securities, Gross Unrealized Losses More than 12 Months	1	11
Fixed maturity securities, Gross Unrealized Losses, Total	125	144
Other [Member]
Fixed maturity securities Fair Value
Fixed maturity securities, Fair Value 12 Months or Less	9,944
Fixed maturity securities, Fair Value, Total	9,944
Fixed maturity securities Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less	135
Fixed maturity securities, Gross Unrealized Losses, Total	135
Municipal Bonds [Member]
Fixed maturity securities Fair Value
Fixed maturity securities, Fair Value 12 Months or Less	108,578	24,047
Fixed maturity securities, Fair Value More than 12 Months	3,990	19,309
Fixed maturity securities, Fair Value, Total	112,568	43,356
Fixed maturity securities Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less	2,605	270
Fixed maturity securities, Gross Unrealized Losses More than 12 Months	43	750
Fixed maturity securities, Gross Unrealized Losses, Total	2,648	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	56,481	273,209
Fixed maturity securities, Fair Value More than 12 Months	26,725	26,977
Fixed maturity securities, Fair Value, Total	83,206	300,186
Fixed maturity securities Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less	875	9,752
Fixed maturity securities, Gross Unrealized Losses More than 12 Months	4,075	6,346
Fixed maturity securities, Gross Unrealized Losses, Total	4,950	16,098
Other Mortgage-backed Securities [Member]
Fixed maturity securities Fair Value
Fixed maturity securities, Fair Value 12 Months or Less	58,218	115,986
Fixed maturity securities, Fair Value More than 12 Months	25,014	36,944
Fixed maturity securities, Fair Value, Total	83,232	152,930
Fixed maturity securities Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less	621	3,222
Fixed maturity securities, Gross Unrealized Losses More than 12 Months	1,411	12,569
Fixed maturity securities, Gross Unrealized Losses, Total	2,032	15,791
Total Fixed Maturities Securities [Member]
Fixed maturity securities Fair Value
Fixed maturity securities, Fair Value 12 Months or Less	244,227	416,761
Fixed maturity securities, Fair Value More than 12 Months	55,779	84,741
Fixed maturity securities, Fair Value, Total	300,006	501,502
Fixed maturity securities Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less	4,360	13,377
Fixed maturity securities, Gross Unrealized Losses More than 12 Months	5,530	19,676
Fixed maturity securities, Gross Unrealized Losses, Total	9,890	33,053
Equity Securities [Member]
Fixed maturity securities Fair Value
Fixed maturity securities, Fair Value 12 Months or Less	19,344
Fixed maturity securities, Fair Value More than 12 Months	9	4,865
Fixed maturity securities, Fair Value, Total	19,353	4,865
Fixed maturity securities Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less	1,288
Fixed maturity securities, Gross Unrealized Losses More than 12 Months	2	326
Fixed maturity securities, Gross Unrealized Losses, Total	$ 1,290	$ 326

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