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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net $ 94,195 $ (164,750) $ 186,193
Other revenues (266,559) (277,692) (334,456)
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives (28,611) 7,408 80,661
Interest credited 364,691 336,964 451,031
Not Designated as Hedging Instrument [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net 44,101 (105,136) 44,958
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net 7,649 20,358 94,848
Not Designated as Hedging Instrument [Member] | Interest Rate Options [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net 0 3,275 15,641
Not Designated as Hedging Instrument [Member] | Future [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net (40,242) 319 (9,550)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net 1,630 (1,160) (8,691)
Not Designated as Hedging Instrument [Member] | Consumer Price Index Swap [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net (401) (208) (344)
Not Designated as Hedging Instrument [Member] | Credit Default Swap [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net 18,100 (4,683) 3,938
Not Designated as Hedging Instrument [Member] | Equity [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net (28,270) (16,899) (22,472)
Not Designated as Hedging Instrument [Member] | Longevity Swap [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Other revenues (13,095) (8,228) (8,088)
Not Designated as Hedging Instrument [Member] | Mortality Swap [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Other revenues (172) (1,822) (797)
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net 54,169 (98,792) 198,365
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Indexed Annuity [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Interest credited 10,708 19,440 (104,844)
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Variable Annuity [Member]      
Income Affect Of Non Hedging Derivatives [Line Items]      
Total investment related gains (losses), net $ 7,835 $ (33,192) $ (129,224)