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Investments Other-Than_Temporary Impairments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Credit losses on fixed maturity securities, beginning of period $ 796  
Add: credit losses on OTTI not previously recognized 798 $ 796
Less: credit losses on securities sold (500)  
Credit losses on fixed maturity securities, end of period 1,094 796
Amounts included in accumulated other comprehensive income related to OTTI securities 0 $ 0
Subprime mortgage debt securities    
Other-Than-Temporary Impairments    
Securities held $ 0  
U.S. Treasury securities    
Other-Than-Temporary Impairments    
Securities held with a material (20% or greater) unrealized loss for four or more consecutive quarters | item 5  
Material loss threshold, number of consecutive quarters | item 4