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Derivative Instruments (Schedule of Call Options by Counterparty) (Details) - Call Options [Member] - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 31,048,082 | $ 29,277,569
Fair value | 830,519 | 337,256
Bank of America [Member] |  |
Derivative [Line Items] |  |
Notional amount | 5,958,884 | 6,257,861
Fair value | 178,477 | 67,662
Barclays [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,441,832 | 2,463,768
Fair value | 89,721 | 35,273
BNP Paribas [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,199,265 | 1,520,710
Fair value | 19,598 | 16,944
Citibank, N.A. [Member] |  |
Derivative [Line Items] |  |
Notional amount | 4,038,528 | 3,786,498
Fair value | 97,094 | 23,587
Credit Suisse [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,130,710 | 1,278,492
Fair value | 44,242 | 12,508
Deutsche Bank [Member] |  |
Derivative [Line Items] |  |
Notional amount | 25,935 | 1,349,002
Fair value | 892 | 10,704
J.P. Morgan [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,785,583 | 838,982
Fair value | 19,645 | 5,283
Morgan Stanley [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,543,421 | 3,465,457
Fair value | 64,425 | 33,171
Royal Bank of Canada [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,384,310 | 2,820,410
Fair value | 103,510 | 48,654
SunTrust [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,375,418 | 1,308,434
Fair value | 72,990 | 20,028
Wells Fargo [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,850,842 | 4,187,955
Fair value | 130,545 | 63,442
Exchange Traded [Member] |  |
Derivative [Line Items] |  |
Notional amount | 313,354 | 0
Fair value | $ 9,380 | $ 0

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