Concentration Of Credit Risk (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 Customer
Concentration Risk [Line Items]
Retained Recourse Obligation For Events Of Default Under Contracts	10,414,000
Events of Default Under Contract by Third Party	70,354,000
Guarantee Obligation Liability	381,000
Concentration Risk, Single Customer, Percentage	3.30%
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Number of Customers Used For Concentration Risk Disclosure	10
Concentration Risk, Percentage	14.40%
Minimum Number Of Major Customers That If Lost Would Have Significant Impact On Company	1
Concentration Risk, Single Customer, Percentage	3.30%