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Quarterly Financial Information (Unaudited) (Comparability of Net Income, Impact of Fair Value Accounting to Fixed Index Annuity Business) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                
Fixed index annuity derivatives, fair value accounting impact on comparability of net income $ 28,298 $ 427 $ (23,593) $ (61,794) $ 3,518 $ 30,806 $ 37,075 $ 7,069