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Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Investments    
Cost or Amortized Cost $ 2,880,511  
Fair Value 3,191,539  
Fixed maturity securities    
Investments    
Cost or Amortized Cost 2,172,677 $ 2,249,891
Gross Unrealized Gains 294,599 431,554
Gross Unrealized Losses (20,355) (2,757)
Fair Value 2,446,921 2,678,688
Fixed maturity securities | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 14,318 15,841
Fixed maturity securities | United States Government and government agencies and authorities    
Investments    
Cost or Amortized Cost 1,859 19,221
Gross Unrealized Gains 194 255
Gross Unrealized Losses 0 (1)
Fair Value 2,053 19,475
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 36,850 42,745
Gross Unrealized Gains 1,890 3,043
Gross Unrealized Losses 0 0
Fair Value 38,740 45,788
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 14,567 19,061
Gross Unrealized Gains 2,644 2,763
Gross Unrealized Losses 0 0
Fair Value 17,211 21,824
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 575 684
Gross Unrealized Gains 37 50
Gross Unrealized Losses 0 0
Fair Value 612 734
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 1,064 3,794
Gross Unrealized Gains 15 102
Gross Unrealized Losses 0 0
Fair Value 1,079 3,896
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 64,917 65,090
Gross Unrealized Gains 6,133 6,948
Gross Unrealized Losses (100) (12)
Fair Value 70,950 72,026
Fixed maturity securities | Residential mortgage-backed | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 2,346 2,386
Fixed maturity securities | Corporate    
Investments    
Cost or Amortized Cost 2,052,845 2,099,296
Gross Unrealized Gains 283,686 418,393
Gross Unrealized Losses (20,255) (2,744)
Fair Value 2,316,276 2,514,945
Fixed maturity securities | Corporate | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI 11,972 13,455
Equity securities    
Investments    
Cost or Amortized Cost 144,407 122,347
Gross Unrealized Gains 14,144 13,672
Gross Unrealized Losses (469) (273)
Fair Value 158,082 135,746
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 361 322
Gross Unrealized Losses 0 0
Fair Value 453 414
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 144,315 122,255
Gross Unrealized Gains 13,783 13,350
Gross Unrealized Losses (469) (273)
Fair Value 157,629 135,332
Equity securities | Non-redeemable preferred stocks | OTTI | Available-for-sale securities    
Investments    
OTTI in AOCI $ 0 $ 0