Off-Balance Sheet Guarantees and Long Term Standby Purchase Commitments Future Minimum Lease Payments and Other Contractual Obligations (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense, Net	$ 1,300,000	$ 1,600,000	$ 700,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	1,246,000
Contractual Obligation, Due in Next Twelve Months	630,000
Operating Leases, Future Minimum Payments, Due in Two Years	1,264,000
Contractual Obligation, Due in Second Year	94,000
Operating Leases, Future Minimum Payments, Due in Three Years	1,281,000
Contractual Obligation, Due in Third Year	6,000
Operating Leases, Future Minimum Payments, Due in Four Years	1,289,000
Contractual Obligation, Due in Fourth Year	0
Operating Leases, Future Minimum Payments, Due in Five Years	1,322,000
Contractual Obligation, Due in Fifth Year	0
Operating Leases, Future Minimum Payments, Due Thereafter	9,694,000
Contractual Obligation, Due after Fifth Year	0
Operating Leases, Future Minimum Payments Due	16,096,000
Contractual Obligation	$ 730,000