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Investments - Schedule of Amortized Cost, Gross Unrealized Gains and Losses, Fair Value, and Other-Than-Temporary-Impairment of Fixed Maturity and Equity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investments    
Cost or Amortized Cost $ 1,123,834  
Fair Value 1,293,532  
Fixed maturity securities    
Investments    
Cost or Amortized Cost 871,466 $ 2,172,677
Gross Unrealized Gains 158,915 294,599
Gross Unrealized Losses (1,718) (20,355)
Fair Value 1,028,663 2,446,921
Fixed maturity securities | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 13,190 14,318
Fixed maturity securities | United States Government and government agencies and authorities    
Investments    
Cost or Amortized Cost 1,844 1,859
Gross Unrealized Gains 143 194
Gross Unrealized Losses 0 0
Fair Value 1,987 2,053
Fixed maturity securities | United States Government and government agencies and authorities | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 0 0
Fixed maturity securities | States, municipalities and political subdivisions    
Investments    
Cost or Amortized Cost 9,890 36,850
Gross Unrealized Gains 937 1,890
Gross Unrealized Losses 0 0
Fair Value 10,827 38,740
Fixed maturity securities | States, municipalities and political subdivisions | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 0 0
Fixed maturity securities | Foreign governments    
Investments    
Cost or Amortized Cost 9,286 14,567
Gross Unrealized Gains 2,015 2,644
Gross Unrealized Losses 0 0
Fair Value 11,301 17,211
Fixed maturity securities | Foreign governments | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 0 0
Fixed maturity securities | Asset-backed    
Investments    
Cost or Amortized Cost 161 575
Gross Unrealized Gains 8 37
Gross Unrealized Losses 0 0
Fair Value 169 612
Fixed maturity securities | Asset-backed | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 0 0
Fixed maturity securities | Commercial mortgage-backed    
Investments    
Cost or Amortized Cost 3,426 1,064
Gross Unrealized Gains 0 15
Gross Unrealized Losses (181) 0
Fair Value 3,245 1,079
Fixed maturity securities | Commercial mortgage-backed | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 0 0
Fixed maturity securities | Residential mortgage-backed    
Investments    
Cost or Amortized Cost 33,731 64,917
Gross Unrealized Gains 3,190 6,133
Gross Unrealized Losses (58) (100)
Fair Value 36,863 70,950
Fixed maturity securities | Residential mortgage-backed | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 2,009 2,346
Fixed maturity securities | U.S. corporate    
Investments    
Cost or Amortized Cost 667,024 1,613,522
Gross Unrealized Gains 127,719 230,567
Gross Unrealized Losses (1,344) (14,060)
Fair Value 793,399 1,830,029
Fixed maturity securities | U.S. corporate | OTTI    
Investments    
OTTI in AOCI 11,181 11,972
Fixed maturity securities | Foreign corporate    
Investments    
Cost or Amortized Cost 146,104 439,323
Gross Unrealized Gains 24,903 53,119
Gross Unrealized Losses (135) (6,195)
Fair Value 170,872 486,247
Fixed maturity securities | Foreign corporate | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 0 0
Equity securities    
Investments    
Cost or Amortized Cost 85,702 144,407
Gross Unrealized Gains 8,099 14,144
Gross Unrealized Losses (184) (469)
Fair Value 93,617 158,082
Equity securities | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 0 0
Equity securities | Common stocks    
Investments    
Cost or Amortized Cost 92 92
Gross Unrealized Gains 355 361
Gross Unrealized Losses 0 0
Fair Value 447 453
Equity securities | Common stocks | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 0 0
Equity securities | Non-redeemable preferred stocks    
Investments    
Cost or Amortized Cost 85,610 144,315
Gross Unrealized Gains 7,744 13,783
Gross Unrealized Losses (184) (469)
Fair Value 93,170 157,629
Equity securities | Non-redeemable preferred stocks | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI $ 0 $ 0