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Investments (Credit Losses Recognized in Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Investments [Abstract]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ 3,677 $ 3,677 $ 3,677 $ 6,013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status $ 0 $ (2,336)