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Investments - Schedule of Credit Loss Impairments on Fixed Maturity Securities for Which a Portion of the OTTI Loss was Recognized in AOCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other-Than-Temporary Impairments      
Other than temporary Impairments $ 1,973 $ 7,724 $ 55
OTTI recognized in earnings 2,179 7,023 24
Portion of net (loss) income recognized in other comprehensive income, before taxes (206) 701 31
Fixed maturity securities      
Other-Than-Temporary Impairments      
OTTI recognized in earnings 327 2,382 24
Credit loss impairments on fixed maturity securities for which a portion of the OTTI loss was recognized in AOCI      
Balance, beginning of year 13,639 13,467 14,164
Additions for credit loss impairments recognized in the current period on securities previously impaired 326 0 24
Additions for credit loss impairments recognized in the current period on securities not previously impaired 0 763 0
Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security (538) (224) (461)
Reductions for credit loss impairments previously recognized on securities which matured, paid down, prepaid or were sold during the period (2,354) (367) (260)
Balance, end of year $ 11,073 $ 13,639 $ 13,467