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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
Mar. 31, 2017
USD ($)
Mar. 31, 2015
Mar. 31, 2017
GBP (£)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
GBP (£)
Dec. 31, 2016
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 $ 700          
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     £ 26,477 $ 33,208 £ 25,882 $ 31,933