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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, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 19,277,639 | $ 15,623,505
Fair value | 856,050 | 415,258
Bank of America [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,683,911 | 568,786
Fair value | 73,836 | 16,533
Barclays [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,396,839 | 3,463,777
Fair value | 113,513 | 103,929
BNP Paribas [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,382,661 | 2,207,097
Fair value | 38,849 | 60,301
Citibank, N.A. [Member] [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,536,547 | 2,878,588
Fair value | 72,310 | 67,592
Credit Suisse [Member] |  |
Derivative [Line Items] |  |
Notional amount | 4,060,352 | 936,625
Fair value | 193,304 | 21,518
Deutsche Bank [Member] |  |
Derivative [Line Items] |  |
Notional amount | 747,587 | 886,688
Fair value | 41,074 | 20,787
HSBC [Member] |  |
Derivative [Line Items] |  |
Notional amount | 200,011 | 295,520
Fair value | 10,518 | 6,539
J.P. Morgan [Member] |  |
Derivative [Line Items] |  |
Notional amount | 786,429 | 735,016
Fair value | 36,863 | 21,940
Morgan Stanley [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,546,487 | 1,590,505
Fair value | 150,437 | 40,113
Royal Bank of Canada [Member] |  |
Derivative [Line Items] |  |
Notional amount | 714,941 | 0
Fair value | 25,140 | 0
Wells Fargo (Wachovia) [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,221,874 | 2,060,903
Fair value | $ 100,206 | $ 56,006

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