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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Comprehensive Income Net Of Tax [Line Items]        
Fixed maturity securities available-for-sale $ 29,642,905 $ 25,480,972    
Other invested assets 1,298,120 1,198,319    
Deferred policy acquisition costs 3,392,437 3,342,575 $ 3,517,796 $ 3,619,274
Accumulated Other Comprehensive Income Loss Change In Component During Period (1,028,965) 1,153,224 (1,524,866)  
Change In Net Unrealized Appreciation Depreciation [Member]        
Comprehensive Income Net Of Tax [Line Items]        
Fixed maturity securities available-for-sale (1,055,458) 1,171,996 (1,528,773)  
Other invested assets [1] 8,983 (14,292) (12,274)  
Effect On Unrealized Appreciation Depreciation [Member]        
Comprehensive Income Net Of Tax [Line Items]        
Deferred policy acquisition costs $ 17,510 $ (4,480) $ 16,181  
[1] Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.