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Derivative Instruments Derivative Call Options, Notional Amount and Fair Value, by Counterparty (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative, Collateral, Obligation to Return Cash $ 572,200,000 $ 328,700,000
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure 78,400,000 93,700,000
Not Designated as Hedging Instrument [Member] | Call Option [Member]
    
Derivative [Line Items]    
Derivative instruments 629,135,000 415,258,000
Derivative, Notional Amount 17,167,732,000 15,623,505,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Bank of America [Member]
    
Derivative [Line Items]    
Derivative instruments 39,162,000 16,533,000
Derivative, Notional Amount 1,075,595,000 568,786,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Barclays [Member]
    
Derivative [Line Items]    
Derivative instruments 131,476,000 103,929,000
Derivative, Notional Amount 3,617,125,000 3,463,777,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, BNP Paribas [Member]
    
Derivative [Line Items]    
Derivative instruments 68,448,000 60,301,000
Derivative, Notional Amount 1,895,967,000 2,207,097,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Citibank, N.A. [Member] [Member]
    
Derivative [Line Items]    
Derivative instruments 64,812,000 67,592,000
Derivative, Notional Amount 1,501,845,000 2,878,588,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Credit Suisse [Member]
    
Derivative [Line Items]    
Derivative instruments 78,855,000 21,518,000
Derivative, Notional Amount 2,922,641,000 936,625,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Deutsche Bank [Member]
    
Derivative [Line Items]    
Derivative instruments 42,587,000 20,787,000
Derivative, Notional Amount 874,245,000 886,688,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, HSBC [Member]
    
Derivative [Line Items]    
Derivative instruments 14,010,000 6,539,000
Derivative, Notional Amount 301,678,000 295,520,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, J.P. Morgan [Member]
    
Derivative [Line Items]    
Derivative instruments 20,635,000 21,940,000
Derivative, Notional Amount 643,078,000 735,016,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Morgan Stanley [Member]
    
Derivative [Line Items]    
Derivative instruments 70,329,000 40,113,000
Derivative, Notional Amount 1,961,040,000 1,590,505,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Wells Fargo (Wachovia) [Member]
    
Derivative [Line Items]    
Derivative instruments 98,821,000 56,006,000
Derivative, Notional Amount $ 2,374,518,000 $ 2,060,903,000