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Investments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
U.S. Treasury obligations [Member]
   
Fixed maturities, available for sale    
Amortized Cost $ 173,632 $ 166,115
Gross Unrealized Gains 4,396 6,118
Gross Unrealized Losses 1,215 1,519
Estimated Fair Value 176,813 170,714
U.S. Government-sponsored enterprise obligations [Member]
   
Fixed maturities, available for sale    
Amortized Cost 42,480 30,942
Gross Unrealized Gains 1,709 2,251
Gross Unrealized Losses 223 425
Estimated Fair Value 43,966 32,768
State and municipal bonds [Member]
   
Fixed maturities, available for sale    
Amortized Cost 1,038,278 1,116,060
Gross Unrealized Gains 50,055 46,533
Gross Unrealized Losses 699 7,927
Estimated Fair Value 1,087,634 1,154,666
Corporate debt [Member]
   
Fixed maturities, available for sale    
Amortized Cost 1,433,266 1,321,838
Gross Unrealized Gains 48,894 53,059
Gross Unrealized Losses 9,175 13,744
Estimated Fair Value 1,472,985 1,361,153
Residential mortgage-backed securities [Member]
   
Fixed maturities, available for sale    
Amortized Cost 282,717 230,861
Gross Unrealized Gains 8,817 7,608
Gross Unrealized Losses 1,220 2,855
Estimated Fair Value 290,314 235,614
Agency commercial mortgage-backed securities [Member]
   
Fixed maturities, available for sale    
Amortized Cost 16,785 27,268
Gross Unrealized Gains 172 343
Gross Unrealized Losses 64 136
Estimated Fair Value 16,893 27,475
Other commercial mortgage-backed securities [Member]
   
Fixed maturities, available for sale    
Amortized Cost 55,853 59,066
Gross Unrealized Gains 1,587 2,491
Gross Unrealized Losses 117 167
Estimated Fair Value 57,323 61,390
Other asset-backed securities [Member]
   
Fixed maturities, available for sale    
Amortized Cost 100,715 74,106
Gross Unrealized Gains 346 487
Gross Unrealized Losses 169 324
Estimated Fair Value 100,892 74,269
Debt Securities [Member]
   
Fixed maturities, available for sale    
Amortized Cost 3,143,726 3,026,256
Gross Unrealized Gains 115,976 118,890
Gross Unrealized Losses 12,882 27,097
Estimated Fair Value $ 3,246,820 $ 3,118,049