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Investments (Investment Income Net of Related Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue $ 525,229 $ 467,718 $ 960,349 $ 911,280
Investment expense (17,563) (17,179) (35,417) (33,850)
Investment income, net of related expenses 507,666 450,539 924,932 877,430
Available-for-sale Securities [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 323,592 303,792 636,007 573,560
Mortgage Loans on Real Estate [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 41,900 37,121 81,692 71,893
Policy loans        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 16,372 16,248 32,506 30,288
Funds withheld at interest        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 112,893 87,325 168,873 199,585
Short-term Investments [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 985 814 1,960 1,509
Other invested assets        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue $ 29,487 $ 22,418 $ 39,311 $ 34,445