Accounts Receivable (Details) In Thousands, unless otherwise specified	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Accounts receivable - trade USD ($)	Dec. 31, 2014 Accounts receivable - trade USD ($)	Mar. 31, 2015 Accounts receivable - grants from outside parties USD ($)	Dec. 31, 2014 Accounts receivable - grants from outside parties USD ($)	Mar. 31, 2014 Accounts receivable - grants from outside parties USD ($)	Mar. 31, 2015 Accounts receivable - insurance and other third-party claims USD ($)	Dec. 31, 2014 Accounts receivable - insurance and other third-party claims USD ($)	Mar. 25, 2015 Freightliner [Member] USD ($)	Mar. 25, 2015 Freightliner [Member] GBP (£)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 401,427	$ 363,104	$ 358,580	$ 304,087	$ 20,271	$ 32,076	$ 23,100	$ 22,576	$ 26,941
Less: Allowance for doubtful accounts	(7,295)	(5,826)
Accounts receivable, net	394,132	357,278
Net realizable value of accounts receivable acquired										$ 75,271	£ 50,531