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Investments (Cumulative Credit Loss Portion of Other Than Temporary Impairment Recognized in Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Investments [Abstract]    
Cumulative credit loss at beginning of period $ (175,398) $ (157,066)
Additions for the amount related to credit losses for which OTTI has not previously been recognized 0 (907)
Additional credit losses on securities for which OTTI has previously been recognized 0 0
Accumulated losses on securities that were disposed of during the period 0 3,900
Cumulative credit loss at end of period $ (175,398) $ (154,073)