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Equity (Components of Net Unrealized Appreciation Depreciation of Balances Carried at Fair Value) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Comprehensive Income Net Of Tax [Line Items]        
Fixed maturity securities available-for-sale $ 39,992,346 $ 38,150,820    
Other invested assets 1,915,297 1,505,332    
Deferred policy acquisition costs 3,397,770 3,239,824 $ 3,338,605 $ 3,392,437
Accumulated Other Comprehensive Income Loss Change In Component During Period (1,712,435) 1,004,927 577,265  
Change In Net Unrealized Appreciation Depreciation [Member]        
Comprehensive Income Net Of Tax [Line Items]        
Fixed maturity securities available-for-sale (1,759,230) 987,570 561,906  
Other invested assets [1] 20,187 25,577 18,900  
Effect On Unrealized Appreciation Depreciation [Member]        
Comprehensive Income Net Of Tax [Line Items]        
Deferred policy acquisition costs $ 26,608 $ (8,220) $ (3,541)  
[1] Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.