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Investments (Details 1) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Number
Dec. 31, 2013
Number
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less $ 776,944 $ 1,672,852
Fixed maturity securities, Fair Value, More than 12 Months 510,314 83,093
Fixed maturity securities, Fair Value, Total 1,287,258 1,755,945
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 8,258 108,594
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 27,637 13,943
Fixed maturity securities, Gross Unrealized Losses, Total 35,895 122,537
Number of positions with a gross unrealized loss position, 12 Months or Less 291 534
Number of position with a gross unrealized loss position, more than 12 months 149 46
Number of position with a gross unrealized loss position, Total 440 580
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less 11.30% 27.40%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months 7.40% 1.40%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total 18.70% 28.80%
Mortgage-backed securities [Member]
    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 5,215 150,602
Fixed maturity securities, Fair Value, More than 12 Months 60,111 1,383
Fixed maturity securities, Fair Value, Total 65,326 151,985
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 121 19,145
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 4,213 415
Fixed maturity securities, Gross Unrealized Losses, Total 4,334 19,560
Other [Member]
    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 39,248 249,765
Fixed maturity securities, Fair Value, More than 12 Months 127,454 4,450
Fixed maturity securities, Fair Value, Total 166,702 254,215
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 195 22,479
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 7,287 872
Fixed maturity securities, Gross Unrealized Losses, Total 7,482 23,351
Municipal bonds [Member]
    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 50,593 375,523
Fixed maturity securities, Fair Value, More than 12 Months 75,448 42,899
Fixed maturity securities, Fair Value, Total 126,041 418,422
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 223 26,529
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 5,642 8,086
Fixed maturity securities, Gross Unrealized Losses, Total 5,865 34,615
Foreign government bonds [Member]
    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 3,940 6,738
Fixed maturity securities, Fair Value, More than 12 Months 0 0
Fixed maturity securities, Fair Value, Total 3,940 6,738
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 60 390
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 0 0
Fixed maturity securities, Gross Unrealized Losses, Total 60 390
Corporate bonds [Member]
    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 232,074 582,849
Fixed maturity securities, Fair Value, More than 12 Months 120,928 12,948
Fixed maturity securities, Fair Value, Total 353,002 595,797
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 3,571 28,634
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 6,037 3,516
Fixed maturity securities, Gross Unrealized Losses, Total 9,608 32,150
Other mortgage-backed securities [Member]
    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 431,870 274,983
Fixed maturity securities, Fair Value, More than 12 Months 99,814 20,008
Fixed maturity securities, Fair Value, Total 531,684 294,991
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 2,809 8,300
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 2,935 552
Fixed maturity securities, Gross Unrealized Losses, Total 5,744 8,852
Total fixed maturity securities [Member]
    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 762,940 1,640,460
Fixed maturity securities, Fair Value, More than 12 Months 483,755 81,688
Fixed maturity securities, Fair Value, Total 1,246,695 1,722,148
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 6,979 105,477
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 26,114 13,441
Fixed maturity securities, Gross Unrealized Losses, Total 33,093 118,918
Equity securities [Member]
    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 14,004 [1] 32,392 [1]
Fixed maturity securities, Fair Value, More than 12 Months 26,559 [1] 1,405 [1]
Fixed maturity securities, Fair Value, Total 40,563 [1] 33,797 [1]
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 1,279 [1] 3,117 [1]
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 1,523 [1] 502 [1]
Fixed maturity securities, Gross Unrealized Losses, Total $ 2,802 [1] $ 3,619 [1]
[1] Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.