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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, 2015 | Dec. 31, 2014
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 29,277,569 | $ 23,956,444
Fair value | 337,256 | 731,113
Bank of America [Member] |  |
Derivative [Line Items] |  |
Notional amount | 6,257,861 | 2,114,812
Fair value | 67,662 | 62,932
Barclays [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,463,768 | 4,083,259
Fair value | 35,273 | 135,609
BNP Paribas [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,520,710 | 1,321,136
Fair value | 16,944 | 42,644
Citibank, N.A. [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,786,498 | 3,190,204
Fair value | 23,587 | 96,759
Credit Suisse [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,278,492 | 2,354,811
Fair value | 12,508 | 75,381
Deutsche Bank [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,349,002 | 2,682,960
Fair value | 10,704 | 64,028
HSBC [Member] |  |
Derivative [Line Items] |  |
Notional amount | 0 | 38,599
Fair value | 0 | 1,767
J.P. Morgan [Member] |  |
Derivative [Line Items] |  |
Notional amount | 838,982 | 401,804
Fair value | 5,283 | 13,488
Morgan Stanley [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,465,457 | 2,605,687
Fair value | 33,171 | 77,106
Royal Bank of Canada [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,820,410 | 1,364,362
Fair value | 48,654 | 41,717
SunTrust [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,308,434 | 248,622
Fair value | 20,028 | 5,405
Wells Fargo [Member] |  |
Derivative [Line Items] |  |
Notional amount | 4,187,955 | 3,550,188
Fair value | $ 63,442 | $ 114,277

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