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Commitments and Contingencies General (Details) £ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 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 | $ 0 | $ 0 | $ 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 | 9,400,000 |  | 9,400,000 |  |  |
Supply Commitment [Member] |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Off-balance sheet risks, liability | 128,600,000 |  | 128,600,000 |  |  |
Deposits [Member] |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Off-balance sheet risks, liability | 10,000,000 |  | 10,000,000 |  |  |
Penalty for Termination Prior to Contractual Termination Period [Member] |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Off-balance sheet risks, liability | 1,400,000 |  | 1,400,000 |  |  |
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 | $ 1,200,000 |  | $ 1,200,000 |  |  |

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