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Investments (Details 5) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Positions
Dec. 31, 2011
Positions
Fixed maturity securities Fair Value    
Fixed maturity securities Fair Value 12 Months or Less $ 263,849 $ 416,761
Fixed maturity securities Fair Value More than 12 Months 67,992 89,606
Fixed maturity securities Fair Value Total 331,841 506,367
Fixed maturity securities Gross Unrealized Losses    
Fixed maturity securities Gross Unrealized Losses 12 Months or Less 8,727 13,377
Fixed maturity securities Gross Unrealized Losses More than 12 Months 8,687 20,002
Fixed maturity securities Gross Unrealized Losses Total 17,414 33,379
Number of Positions With Gross Unrealized Loss, 12 Months or less 189 159
Number of Positions With Gross Unrealized Loss, More Than Twelve Months 37 44
Number Of Positions With Gross Unrealized Loss, Fair Value 226 203
Fair Value as Percentage of Aggregate Fixed Maturities and Equity Securities Fair Value for Twelve Months or Less 4.60% 7.70%
Fair Value as Percentage of Aggregate Fixed Maturities and Equity Securities Fair Value for More Than Twelve Months 1.20% 1.60%
Fair Value as Percentage of Aggregate Fixed Maturities and Equity Securities Fair Value 5.80% 9.30%
Mortgage-backed securities [Member]
   
Fixed maturity securities Fair Value    
Fixed maturity securities Fair Value 12 Months or Less 5,996 3,519
Fixed maturity securities Fair Value More than 12 Months 1,350 1,511
Fixed maturity securities Fair Value Total 7,346 5,030
Fixed maturity securities Gross Unrealized Losses    
Fixed maturity securities Gross Unrealized Losses 12 Months or Less 1 133
Fixed maturity securities Gross Unrealized Losses More than 12 Months 4 11
Fixed maturity securities Gross Unrealized Losses Total 5 144
Other [Member]
   
Fixed maturity securities Fair Value    
Fixed maturity securities Fair Value 12 Months or Less 26,947  
Fixed maturity securities Fair Value Total 26,947  
Fixed maturity securities Gross Unrealized Losses    
Fixed maturity securities Gross Unrealized Losses 12 Months or Less 103  
Fixed maturity securities Gross Unrealized Losses Total 103  
Municipal bonds [Member]
   
Fixed maturity securities Fair Value    
Fixed maturity securities Fair Value 12 Months or Less 75,552 24,047
Fixed maturity securities Fair Value More than 12 Months 3,359 19,309
Fixed maturity securities Fair Value Total 78,911 43,356
Fixed maturity securities Gross Unrealized Losses    
Fixed maturity securities Gross Unrealized Losses 12 Months or Less 1,743 270
Fixed maturity securities Gross Unrealized Losses More than 12 Months 676 750
Fixed maturity securities Gross Unrealized Losses Total 2,419 1,020
Corporate bonds [Member]
   
Fixed maturity securities Fair Value    
Fixed maturity securities Fair Value 12 Months or Less 99,779 273,209
Fixed maturity securities Fair Value More than 12 Months 30,434 26,977
Fixed maturity securities Fair Value Total 130,213 300,186
Fixed maturity securities Gross Unrealized Losses    
Fixed maturity securities Gross Unrealized Losses 12 Months or Less 4,315 9,752
Fixed maturity securities Gross Unrealized Losses More than 12 Months 6,405 6,346
Fixed maturity securities Gross Unrealized Losses Total 10,720 16,098
Other mortgage-backed securities [Member]
   
Fixed maturity securities Fair Value    
Fixed maturity securities Fair Value 12 Months or Less 46,185 115,986
Fixed maturity securities Fair Value More than 12 Months 32,837 36,944
Fixed maturity securities Fair Value Total 79,022 152,930
Fixed maturity securities Gross Unrealized Losses    
Fixed maturity securities Gross Unrealized Losses 12 Months or Less 1,392 3,222
Fixed maturity securities Gross Unrealized Losses More than 12 Months 1,598 12,569
Fixed maturity securities Gross Unrealized Losses Total 2,990 15,791
Equity Securities [Member]
   
Fixed maturity securities Fair Value    
Fixed maturity securities Fair Value 12 Months or Less 9,390  
Fixed maturity securities Fair Value More than 12 Months 12 4,865
Fixed maturity securities Fair Value Total 9,402 4,865
Fixed maturity securities Gross Unrealized Losses    
Fixed maturity securities Gross Unrealized Losses 12 Months or Less 1,173  
Fixed maturity securities Gross Unrealized Losses More than 12 Months 4 326
Fixed maturity securities Gross Unrealized Losses Total 1,177 326
Total Fixed Maturities [Member]
   
Fixed maturity securities Fair Value    
Fixed maturity securities Fair Value 12 Months or Less 254,459 416,761
Fixed maturity securities Fair Value More than 12 Months 67,980 84,741
Fixed maturity securities Fair Value Total 322,439 501,502
Fixed maturity securities Gross Unrealized Losses    
Fixed maturity securities Gross Unrealized Losses 12 Months or Less 7,554 13,377
Fixed maturity securities Gross Unrealized Losses More than 12 Months 8,683 19,676
Fixed maturity securities Gross Unrealized Losses Total $ 16,237 $ 33,053