Guarantees (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Guarantor Obligations [Line Items]
Maximum Exposure of Guarantee	$ 30,792,000	$ 8,325,000
Carrying Amount of Liability	6,245,000	7,764,000
Guarantees (Textual) [Abstract]
Customer finance leases expire periodically	Jan. 01, 2019
Estimated outstanding assumed claims	6,000,000
Outstanding letter of credit provided by the purchaser	0
Contingent rentals associated with residual value guarantees [Member]
Guarantor Obligations [Line Items]
Maximum Exposure of Guarantee	183,000,000	91,000,000
Carrying Amount of Liability	2,000,000	4,000,000
Lease Term Residual Value Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum Exposure of Guarantee	$ 25,000,000