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Investments (Investment Income Net of Related Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating $ 1,802,539 $ 1,776,011 $ 1,751,891
Investment Income, Investment Expense (68,044) (62,320) (52,026)
Investment income, net of related expenses 1,734,495 1,713,691 1,699,865
Available-for-sale Securities [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 1,177,706 1,052,715 966,759
Mortgage Loans on Real Estate [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 149,564 148,417 121,476
Policy Loans [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 62,955 55,248 57,099
Funds Withheld At Interest [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 343,031 447,364 545,550
Short-term Investments [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating 2,567 2,118 2,236
Other Aggregated Investments [Member]      
Major Categories Of Investment Income Net Of Expenses [Line Items]      
Gross Investment Income, Operating $ 66,716 $ 70,149 $ 58,771