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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
Jun. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Notional amount $ 30,148,735 $ 29,277,569
Derivative instruments 576,262 337,256
Bank of America [Member]    
Derivative [Line Items]    
Notional amount 6,555,160 6,257,861
Derivative instruments 124,871 67,662
Barclays [Member]    
Derivative [Line Items]    
Notional amount 2,677,943 2,463,768
Derivative instruments 58,261 35,273
BNP Paribas [Member]    
Derivative [Line Items]    
Notional amount 1,154,557 1,520,710
Derivative instruments 25,532 16,944
Citibank, N.A. [Member]    
Derivative [Line Items]    
Notional amount 3,667,666 3,786,498
Derivative instruments 46,160 23,587
Credit Suisse [Member]    
Derivative [Line Items]    
Notional amount 1,573,916 1,278,492
Derivative instruments 29,563 12,508
Deutsche Bank [Member]    
Derivative [Line Items]    
Notional amount 557,990 1,349,002
Derivative instruments 6,167 10,704
J.P. Morgan [Member]    
Derivative [Line Items]    
Notional amount 1,308,604 838,982
Derivative instruments 24,114 5,283
Morgan Stanley [Member]    
Derivative [Line Items]    
Notional amount 3,322,720 3,465,457
Derivative instruments 38,833 33,171
Royal Bank of Canada [Member]    
Derivative [Line Items]    
Notional amount 3,260,997 2,820,410
Derivative instruments 76,346 48,654
SunTrust [Member]    
Derivative [Line Items]    
Notional amount 1,542,351 1,308,434
Derivative instruments 38,407 20,028
Wells Fargo [Member]    
Derivative [Line Items]    
Notional amount 4,426,882 4,187,955
Derivative instruments 105,968 63,442
Exchange Traded [Member]    
Derivative [Line Items]    
Notional amount 99,949 0
Derivative instruments $ 2,040 $ 0