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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, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Notional amount $ 21,461,842 $ 19,277,639
Derivative instruments 905,688 856,050
Bank of America [Member]
    
Derivative [Line Items]    
Notional amount 1,903,168 1,683,911
Derivative instruments 77,824 73,836
Barclays [Member]
    
Derivative [Line Items]    
Notional amount 2,845,414 2,396,839
Derivative instruments 88,512 113,513
BNP Paribas [Member]
    
Derivative [Line Items]    
Notional amount 1,399,032 1,382,661
Derivative instruments 52,262 38,849
Citibank, N.A. [Member]
    
Derivative [Line Items]    
Notional amount 3,099,547 1,536,547
Derivative instruments 117,391 72,310
Credit Suisse [Member]
    
Derivative [Line Items]    
Notional amount 2,648,174 4,060,352
Derivative instruments 141,755 193,304
Deutsche Bank [Member]
    
Derivative [Line Items]    
Notional amount 1,428,366 747,587
Derivative instruments 51,512 41,074
HSBC [Member]
    
Derivative [Line Items]    
Notional amount 131,837 200,011
Derivative instruments 7,468 10,518
J.P. Morgan [Member]
    
Derivative [Line Items]    
Notional amount 631,923 786,429
Derivative instruments 31,745 36,863
Morgan Stanley [Member]
    
Derivative [Line Items]    
Notional amount 3,605,771 3,546,487
Derivative instruments 190,421 150,437
Royal Bank of Canada [Member]
    
Derivative [Line Items]    
Notional amount 1,201,172 714,941
Derivative instruments 46,183 25,140
Wells Fargo [Member]
    
Derivative [Line Items]    
Notional amount 2,567,438 2,221,874
Derivative instruments $ 100,615 $ 100,206