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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, 2017
Dec. 31, 2016
Derivative [Line Items]    
Notional amount $ 32,113,108 $ 31,048,082
Derivative instruments 1,033,552 830,519
Bank of America [Member]    
Derivative [Line Items]    
Notional amount 5,676,888 5,958,884
Derivative instruments 209,569 178,477
Barclays [Member]    
Derivative [Line Items]    
Notional amount 3,631,850 3,441,832
Derivative instruments 109,490 89,721
BNP Paribas [Member]    
Derivative [Line Items]    
Notional amount 1,483,850 1,199,265
Derivative instruments 31,512 19,598
Citibank, N.A. [Member]    
Derivative [Line Items]    
Notional amount 3,897,329 4,038,528
Derivative instruments 142,794 97,094
Credit Suisse [Member]    
Derivative [Line Items]    
Notional amount 3,082,459 2,130,710
Derivative instruments 65,735 44,242
Deutsche Bank [Member]    
Derivative [Line Items]    
Notional amount 134 25,935
Derivative instruments 0 892
J.P. Morgan [Member]    
Derivative [Line Items]    
Notional amount 1,637,316 1,785,583
Derivative instruments 37,722 19,645
Morgan Stanley [Member]    
Derivative [Line Items]    
Notional amount 2,720,647 2,543,421
Derivative instruments 86,570 64,425
Royal Bank of Canada [Member]    
Derivative [Line Items]    
Notional amount 3,209,624 3,384,310
Derivative instruments 119,076 103,510
SunTrust [Member]    
Derivative [Line Items]    
Notional amount 2,717,302 2,375,418
Derivative instruments 89,869 72,990
Wells Fargo [Member]    
Derivative [Line Items]    
Notional amount 3,648,407 3,850,842
Derivative instruments 127,924 130,545
Exchange Traded [Member]    
Derivative [Line Items]    
Notional amount 407,302 313,354
Derivative instruments $ 13,291 $ 9,380