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Investments (Available For Sale Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
U.S. Treasury obligations [Member]    
Fixed maturities, available for sale    
Amortized Cost $ 122,855 $ 163,714
Due in one year or less 10,703  
Due after one year through five years 94,067  
Due after five years through ten years 15,923  
Due after ten years 3,199  
Total Fair Value 123,892 166,512
U.S. Government-sponsored enterprise obligations [Member]    
Fixed maturities, available for sale    
Amortized Cost 25,456 38,022
Due in one year or less 2,290  
Due after one year through five years 16,593  
Due after five years through ten years 7,312  
Due after ten years 139  
Total Fair Value 26,334 39,563
State and municipal bonds [Member]    
Fixed maturities, available for sale    
Amortized Cost 904,719 1,015,555
Due in one year or less 48,752  
Due after one year through five years 332,489  
Due after five years through ten years 428,872  
Due after ten years 130,522  
Total Fair Value 940,635 1,062,615
Corporate debt [Member]    
Fixed maturities, available for sale    
Amortized Cost 1,296,128 1,389,970
Due in one year or less 104,746  
Due after one year through five years 698,148  
Due after five years through ten years 455,849  
Due after ten years 32,943  
Total Fair Value 1,291,686 1,417,101
Residential mortgage-backed securities [Member]    
Fixed maturities, available for sale    
Amortized Cost 233,659 266,306
Total Fair Value 238,387 276,056
Agency commercial mortgage-backed securities [Member]    
Fixed maturities, available for sale    
Amortized Cost 10,851 15,344
Total Fair Value 10,999 15,493
Other commercial mortgage-backed securities [Member]    
Fixed maturities, available for sale    
Amortized Cost 29,983 50,025
Total Fair Value 30,134 51,063
Other asset-backed securities [Member]    
Fixed maturities, available for sale    
Amortized Cost 98,412 116,541
Total Fair Value 98,220 116,624
Debt Securities [Member]    
Fixed maturities, available for sale    
Amortized Cost 2,722,063 3,055,477
Total Fair Value $ 2,760,287 $ 3,145,027