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Commitments and Contingencies General (Details)
£ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2016
GBP (£)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options $ 37,000 $ 75,000  
Loss Contingency Accrual 5,000,000   £ 3.4
Commitments to Car Operations [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Off-balance sheet risks, liability 9,900,000    
Supply Commitment [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Off-balance sheet risks, liability 115,200,000    
Deposits [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Off-balance sheet risks, liability 7,500,000    
Penalty for Termination Prior to Contractual Termination Period [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Off-balance sheet risks, liability 1,500,000    
Penalty (UK) for Termination Prior to Contractual Termination Period [Domain]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Off-balance sheet risks, liability $ 1,700,000