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Investments (Investment Income Net of Related Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue $ 533,034 $ 435,119
Investment expense (18,670) (17,853)
Investment income, net of related expenses 514,364 417,266
Available-for-sale Securities [Member]    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 324,500 312,414
Mortgage Loans on Real Estate [Member]    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 44,347 39,792
Policy loans    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 15,272 16,134
Funds withheld at interest    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 127,578 55,980
Short-term Investments [Member]    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 1,510 2,191
Other invested assets    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue $ 19,827 $ 8,608