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Fair Value of Financial Instruments Financial instruments Carried at Fair Value-Level 3 (Details)
£ in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Mar. 31, 2015
Sep. 30, 2016
USD ($)
Sep. 30, 2016
GBP (£)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
GBP (£)
Dec. 31, 2015
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Loss recognized in earnings as a result of the change in estimated fair value $ 900   $ 2,000        
Freightliner [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Percentage of economic interest retained by acquiree's management   6.00%          
Fair Value, Inputs, Level 3 [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Business Combination, Contingent Consideration, Liability       £ 25,671 $ 33,298 £ 24,200 $ 35,680