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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, 2017
Dec. 31, 2016
Derivative [Line Items]    
Notional amount $ 34,213,127 $ 31,048,082
Derivative instruments 1,235,125 830,519
Bank of America [Member]    
Derivative [Line Items]    
Notional amount 4,295,908 5,958,884
Derivative instruments 187,930 178,477
Barclays [Member]    
Derivative [Line Items]    
Notional amount 4,628,936 3,441,832
Derivative instruments 138,249 89,721
BNP Paribas [Member]    
Derivative [Line Items]    
Notional amount 1,938,070 1,199,265
Derivative instruments 65,535 19,598
Canadian Imperial Bank of Commerce [Member]    
Derivative [Line Items]    
Notional amount 1,235,942 0
Derivative instruments 28,451 0
Citibank, N.A. [Member]    
Derivative [Line Items]    
Notional amount 4,111,559 4,038,528
Derivative instruments 190,027 97,094
Credit Suisse [Member]    
Derivative [Line Items]    
Notional amount 3,463,619 2,130,710
Derivative instruments 111,405 44,242
Deutsche Bank [Member]    
Derivative [Line Items]    
Notional amount 0 25,935
Derivative instruments 0 892
J.P. Morgan [Member]    
Derivative [Line Items]    
Notional amount 1,571,624 1,785,583
Derivative instruments 64,112 19,645
Morgan Stanley [Member]    
Derivative [Line Items]    
Notional amount 3,195,620 2,543,421
Derivative instruments 134,302 64,425
Royal Bank of Canada [Member]    
Derivative [Line Items]    
Notional amount 3,139,561 3,384,310
Derivative instruments 97,472 103,510
SunTrust [Member]    
Derivative [Line Items]    
Notional amount 2,763,926 2,375,418
Derivative instruments 94,439 72,990
Wells Fargo [Member]    
Derivative [Line Items]    
Notional amount 3,521,620 3,850,842
Derivative instruments 112,389 130,545
Exchange Traded [Member]    
Derivative [Line Items]    
Notional amount 346,742 313,354
Derivative instruments $ 10,814 $ 9,380