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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
Sep. 30, 2015
Dec. 31, 2014
Derivative [Line Items]    
Notional amount $ 28,018,741 $ 23,956,444
Derivative instruments 180,649 731,113
Bank of America [Member]    
Derivative [Line Items]    
Notional amount 5,415,765 2,114,812
Derivative instruments 33,313 62,932
Barclays [Member]    
Derivative [Line Items]    
Notional amount 2,816,999 4,083,259
Derivative instruments 30,954 135,609
BNP Paribas [Member]    
Derivative [Line Items]    
Notional amount 1,749,912 1,321,136
Derivative instruments 15,409 42,644
Citibank, N.A. [Member]    
Derivative [Line Items]    
Notional amount 3,314,018 3,190,204
Derivative instruments 6,834 96,759
Credit Suisse [Member]    
Derivative [Line Items]    
Notional amount 1,517,315 2,354,811
Derivative instruments 8,875 75,381
Deutsche Bank [Member]    
Derivative [Line Items]    
Notional amount 1,733,406 2,682,960
Derivative instruments 1,537 64,028
HSBC [Member]    
Derivative [Line Items]    
Notional amount 0 38,599
Derivative instruments 0 1,767
J.P. Morgan [Member]    
Derivative [Line Items]    
Notional amount 703,532 401,804
Derivative instruments 2,309 13,488
Morgan Stanley [Member]    
Derivative [Line Items]    
Notional amount 3,622,471 2,605,687
Derivative instruments 19,178 77,106
Royal Bank of Canada [Member]    
Derivative [Line Items]    
Notional amount 2,265,389 1,364,362
Derivative instruments 22,342 41,717
SunTrust [Member]    
Derivative [Line Items]    
Notional amount 836,304 248,622
Derivative instruments 4,096 5,405
Wells Fargo [Member]    
Derivative [Line Items]    
Notional amount 4,043,630 3,550,188
Derivative instruments $ 35,802 $ 114,277