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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net $ 22,653 $ 86,624 $ 139,471 $ 84,002
Policy acquisition costs and other insurance expenses (365,424) (300,962) (1,064,645) (940,406)
Interest credited (126,099) (116,848) (349,068) (300,602)
Other revenues 75,942 72,468 218,091 197,844
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives (8,961) (5,427) (28,125) 89,408
Not Designated as Hedging Instrument        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (5,255) 31,535 59,757 19,384
Not Designated as Hedging Instrument | Interest Rate Swap [Member]        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 641 4,122 12,318 108,149
Not Designated as Hedging Instrument | Financial Futures        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (8,890) (11,677) (28,107) (30,285)
Not Designated as Hedging Instrument | Foreign Currency Forwards        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 24 507 577 6,584
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 220 76 211 (624)
Not Designated as Hedging Instrument | Credit Default Swaps        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 4,137 6,672 15,374 13,536
Not Designated as Hedging Instrument | Equity Options        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (8,295) (13,648) (34,757) (19,576)
Not Designated as Hedging Instrument | Longevity Swap [Member]        
Income Affect Of Non Hedging Derivatives [Line Items]        
Other revenues 3,334 8,921 7,180 11,402
Not Designated as Hedging Instrument | Mortality Swap [Member]        
Income Affect Of Non Hedging Derivatives [Line Items]        
Other revenues (132) (400) (921) 222
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 23,044 49,078 106,854 33,795
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]        
Income Affect Of Non Hedging Derivatives [Line Items]        
Interest credited (13,133) (20,104) (35,490) (20,730)
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net $ (6,205) $ 7,988 $ 16,518 $ (83,089)