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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options [Member] - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivative [Line Items]    
Notional amount $ 29,875,707 $ 29,277,569
Derivative instruments 387,469 337,256
Bank of America [Member]    
Derivative [Line Items]    
Notional amount 6,697,638 6,257,861
Derivative instruments 78,296 67,662
Barclays [Member]    
Derivative [Line Items]    
Notional amount 2,290,633 2,463,768
Derivative instruments 37,769 35,273
BNP Paribas [Member]    
Derivative [Line Items]    
Notional amount 1,351,337 1,520,710
Derivative instruments 20,456 16,944
Citibank, N.A. [Member]    
Derivative [Line Items]    
Notional amount 3,749,452 3,786,498
Derivative instruments 23,432 23,587
Credit Suisse [Member]    
Derivative [Line Items]    
Notional amount 1,610,605 1,278,492
Derivative instruments 25,342 12,508
Deutsche Bank [Member]    
Derivative [Line Items]    
Notional amount 1,042,549 1,349,002
Derivative instruments 6,063 10,704
J.P. Morgan [Member]    
Derivative [Line Items]    
Notional amount 1,087,115 838,982
Derivative instruments 15,110 5,283
Morgan Stanley [Member]    
Derivative [Line Items]    
Notional amount 3,272,374 3,465,457
Derivative instruments 23,861 33,171
Royal Bank of Canada [Member]    
Derivative [Line Items]    
Notional amount 2,949,467 2,820,410
Derivative instruments 50,617 48,654
SunTrust [Member]    
Derivative [Line Items]    
Notional amount 1,342,568 1,308,434
Derivative instruments 26,269 20,028
Wells Fargo [Member]    
Derivative [Line Items]    
Notional amount 4,481,969 4,187,955
Derivative instruments $ 80,254 $ 63,442