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Investments - Schedule of Estimated Fair Values and Gross Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fixed maturity securities    
Less than 12 months    
Fair Value $ 445,750 $ 920,670
Unrealized Loss (8,602) (9,548)
12 months or greater    
Fair Value 3,579 0
Unrealized Loss (4,032) 0
Total Fair Value 449,329 920,670
Total Unrealized Loss (12,634) (9,548)
U.S. Government and government agencies    
Less than 12 months    
Fair Value 4,392 15,409
Unrealized Loss (95) (49)
12 months or greater    
Fair Value 0 0
Unrealized Loss 0 0
Total Fair Value 4,392 15,409
Total Unrealized Loss (95) (49)
States, municipalities and political subdivisions    
Less than 12 months    
Fair Value 207,740 294,105
Unrealized Loss (3,858) (1,227)
12 months or greater    
Fair Value 0 0
Unrealized Loss 0 0
Total Fair Value 207,740 294,105
Total Unrealized Loss (3,858) (1,227)
Foreign government    
Less than 12 months    
Fair Value 5,978  
Unrealized Loss (402)  
12 months or greater    
Fair Value 0  
Unrealized Loss 0  
Total Fair Value 5,978  
Total Unrealized Loss (402)  
Residential mortgage-backed securities    
Less than 12 months    
Fair Value 54,385 77,695
Unrealized Loss (564) (588)
12 months or greater    
Fair Value 0 0
Unrealized Loss 0 0
Total Fair Value 54,385 77,695
Total Unrealized Loss (564) (588)
Commercial mortgage-backed securities    
Less than 12 months    
Fair Value 13,159 44,618
Unrealized Loss (89) (96)
12 months or greater    
Fair Value 0 0
Unrealized Loss 0 0
Total Fair Value 13,159 44,618
Total Unrealized Loss (89) (96)
Asset-backed securities    
Less than 12 months    
Fair Value 12,443 22,550
Unrealized Loss (572) (51)
12 months or greater    
Fair Value 0 0
Unrealized Loss 0 0
Total Fair Value 12,443 22,550
Total Unrealized Loss (572) (51)
Corporate and other    
Less than 12 months    
Fair Value 147,653 466,293
Unrealized Loss (3,022) (7,537)
12 months or greater    
Fair Value 3,579 0
Unrealized Loss (4,032) 0
Total Fair Value 151,232 466,293
Total Unrealized Loss (7,054) (7,537)
Equity securities    
Less than 12 months    
Fair Value 35,049 21,035
Unrealized Loss (1,949) (1,317)
12 months or greater    
Fair Value 0 0
Unrealized Loss 0 0
Total Fair Value 35,049 21,035
Total Unrealized Loss (1,949) (1,317)
Common stocks    
Less than 12 months    
Fair Value 14,585 13,657
Unrealized Loss (1,371) (1,311)
12 months or greater    
Fair Value 0 0
Unrealized Loss 0 0
Total Fair Value 14,585 13,657
Total Unrealized Loss (1,371) (1,311)
Equity securities    
Less than 12 months    
Fair Value 20,464 7,378
Unrealized Loss (578) (6)
12 months or greater    
Fair Value 0 0
Unrealized Loss 0 0
Total Fair Value 20,464 7,378
Total Unrealized Loss $ (578) $ (6)