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Derivative Instruments Derivative Call Options, Notional Amount and Fair Value, by Counterparty (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative, Collateral, Obligation to Return Cash $ 649,800,000 $ 328,700,000
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure 82,200,000 93,700,000
Not Designated as Hedging Instrument [Member] | Call Option [Member]
    
Derivative [Line Items]    
Derivative instruments 719,683,000 415,258,000
Derivative, Notional Amount 16,292,199,000 15,623,505,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Bank of America [Member]
    
Derivative [Line Items]    
Derivative instruments 33,168,000 16,533,000
Derivative, Notional Amount 813,718,000 568,786,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Barclays [Member]
    
Derivative [Line Items]    
Derivative instruments 140,646,000 103,929,000
Derivative, Notional Amount 3,604,972,000 3,463,777,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, BNP Paribas [Member]
    
Derivative [Line Items]    
Derivative instruments 90,994,000 60,301,000
Derivative, Notional Amount 2,272,043,000 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 154,838,000 67,592,000
Derivative, Notional Amount 2,804,662,000 2,878,588,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Credit Suisse [Member]
    
Derivative [Line Items]    
Derivative instruments 51,175,000 21,518,000
Derivative, Notional Amount 1,386,267,000 936,625,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Deutsche Bank [Member]
    
Derivative [Line Items]    
Derivative instruments 40,958,000 20,787,000
Derivative, Notional Amount 783,364,000 886,688,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, HSBC [Member]
    
Derivative [Line Items]    
Derivative instruments 13,583,000 6,539,000
Derivative, Notional Amount 299,965,000 295,520,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, J.P. Morgan [Member]
    
Derivative [Line Items]    
Derivative instruments 28,279,000 21,940,000
Derivative, Notional Amount 589,888,000 735,016,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Morgan Stanley [Member]
    
Derivative [Line Items]    
Derivative instruments 73,496,000 40,113,000
Derivative, Notional Amount 1,632,282,000 1,590,505,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Wells Fargo (Wachovia) [Member]
    
Derivative [Line Items]    
Derivative instruments 92,546,000 56,006,000
Derivative, Notional Amount $ 2,105,038,000 $ 2,060,903,000