Commitments and Contingencies General (Details)	3 Months Ended									3 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2015 GBP (£)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 GBP (£)	Mar. 31, 2015 Commitments to Car Operations [Member] USD ($)	Mar. 31, 2015 Supply Commitment [Member] USD ($)	Mar. 31, 2015 Deposits [Member] USD ($)	Mar. 31, 2015 Guarantee Obligations [Member] USD ($)	Mar. 31, 2015 Guarantee Obligations [Member] U.K. Portfolio Structured Financing Trust [Member] european_payment_system	Mar. 31, 2015 Penalty for Termination Prior to Contractual Termination Period [Member] USD ($)	Mar. 31, 2015 Penalty (UK) for Termination Prior to Contractual Termination Period [Domain] USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	$ (75,000)	$ 0
Off-balance sheet risks, liability						10,100,000	89,500,000	4,700,000	200,000		2,300,000	1,800,000
Number of European payment systems to which the Company has guarantor obligations										1
Loss Contingency Accrual	$ 4,600,000		£ 3,100,000	$ 4,600,000	£ 3,100,000