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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