Securitization Notes Payable Securitization Notes Payable (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Debt Instrument [Line Items]
Amortization of Debt Discount (Premium)	$ (26,068,000)	$ (57,698,000)
Purchase Price Premium, Unamortized	16,700,000
Unamortized Debt Issuance - Securitization Notes Payable	26,200,000		16,300,000
Securitization Notes Payable [Member]
Debt Instrument [Line Items]
Amortization of Debt Discount (Premium)	$ 25,700,000	$ 54,900,000