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Investments (Other Than Temporary Impairment, Credit Losses Recognized in Earnings) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Cumulative credit loss at beginning of year $ (175,398) $ (157,066)
Additions for the amount related to credit losses for which OTTI has not previously been recognized (18,271) (35,005)
Additional credit losses on securities for which OTTI has previously been recognized (455) (1,651)
Accumulated losses on securities that were disposed of during the period 24,422 18,324
Cumulative credit loss at end of year $ (169,702) $ (175,398)