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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
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Notional amount $ 20,281,860 $ 19,277,639
Derivative instruments 790,396 856,050
Bank of America [Member]
    
Derivative [Line Items]    
Notional amount 1,590,121 1,683,911
Derivative instruments 61,063 73,836
Barclays [Member]
    
Derivative [Line Items]    
Notional amount 1,927,994 2,396,839
Derivative instruments 61,753 113,513
BNP Paribas [Member]
    
Derivative [Line Items]    
Notional amount 1,299,886 1,382,661
Derivative instruments 36,924 38,849
Citibank, N.A. [Member]
    
Derivative [Line Items]    
Notional amount 2,423,596 1,536,547
Derivative instruments 81,072 72,310
Credit Suisse [Member]
    
Derivative [Line Items]    
Notional amount 4,101,721 4,060,352
Derivative instruments 193,008 193,304
Deutsche Bank [Member]
    
Derivative [Line Items]    
Notional amount 838,142 747,587
Derivative instruments 35,175 41,074
HSBC [Member]
    
Derivative [Line Items]    
Notional amount 169,761 200,011
Derivative instruments 6,442 10,518
J.P. Morgan [Member]
    
Derivative [Line Items]    
Notional amount 923,585 786,429
Derivative instruments 39,197 36,863
Morgan Stanley [Member]
    
Derivative [Line Items]    
Notional amount 3,847,956 3,546,487
Derivative instruments 154,226 150,437
Royal Bank of Canada [Member]
    
Derivative [Line Items]    
Notional amount 871,208 714,941
Derivative instruments 31,084 25,140
Wells Fargo [Member]
    
Derivative [Line Items]    
Notional amount 2,287,890 2,221,874
Derivative instruments $ 90,452 $ 100,206