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Investments (Investment Income Net of Related Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue $ 538,382 $ 533,034
Investment expense (22,053) (18,670)
Investment income, net of related expenses 516,329 514,364
Available-for-sale Securities [Member]    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 369,203 324,500
Equity Securities [Member]    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 1,682 1,359
Mortgage Loans on Real Estate [Member]    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 50,199 44,347
Policy loans    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 14,780 15,272
Funds withheld at interest    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 75,445 127,578
Short-term Investments [Member]    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue 3,245 1,510
Other invested assets    
Major Categories Of Investment Income Net of Expenses [Line Items]    
Investment revenue $ 23,828 $ 18,468