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Investments (Investment Income Net of Related Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue $ 406,052 $ 462,804 $ 1,317,332 $ 1,306,241
Investment expense (16,455) (15,698) (50,305) (44,153)
Investment income, net of related expenses 389,597 447,106 1,267,027 1,262,088
Available-for-sale Securities [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 298,376 269,346 871,936 766,764
Mortgage Loans on Real Estate [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 36,547 39,070 108,440 102,535
Policy loans        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 16,475 13,825 46,763 41,014
Funds withheld at interest        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 40,382 124,685 239,967 345,484
Short-term Investments [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 576 462 2,085 1,507
Other invested assets        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue $ 13,696 $ 15,416 $ 48,141 $ 48,937