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Investments (Changes in Net Unrealized Gains on Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Investment Holdings [Line Items]        
Fixed maturity securities held for investment carried at amortized cost $ 9,806 $ 820 $ 7,830 $ 3,065
Investments carried at fair value, available for sale 598,399 1,167,860 879,480 2,282,928
Adjustment for effect on other balance sheet accounts:        
Deferred policy acquisition costs and deferred sales inducements (312,893) (609,224) (463,855) (1,218,975)
Deferred income tax asset/liability (99,927) (195,523) (145,469) (372,384)
Total adjustment for effect on other balance sheet accounts (412,820) (804,747) (609,324) (1,591,359)
Change in net unrealized gains on investments carried at fair value 185,579 363,113 270,156 691,569
Fixed Maturity Securities [Member]        
Investment Holdings [Line Items]        
Investments carried at fair value, available for sale 598,408 1,167,861 879,502 2,282,946
Equity Securities [Member]        
Investment Holdings [Line Items]        
Investments carried at fair value, available for sale $ (9) $ (1) $ (22) $ (18)