Guarantees (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]
Maximum Exposure of Guarantee	$ 50,615	$ 30,293
Carrying Amount of Liability	0	6,234
Vehicle Residual Value Guarnatees Operating Lease Programs [Member]
Guarantor Obligations [Line Items]
Maximum Exposure of Guarantee	50,615	24,059
Carrying Amount of Liability	0	0
Standby letters of credit [Member]
Guarantor Obligations [Line Items]
Maximum Exposure of Guarantee	0	6,234
Carrying Amount of Liability	$ 0	$ 6,234