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Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We are a party to ordinary, routine litigation and administrative proceedings incidental to our business. In the opinion of management, our potential exposure under pending legal proceedings is adequately provided for in the accompanying consolidated financial statements. As part of a previous acquisition in 2013, we entered into an agreement with certain stockholders of the selling company ("Sellers"), which contained contingent consideration provisions. The contingent consideration included various earn-out targets tied to certain operational metrics of the acquired company as well as consolidated operational performance over the period of 2014 through 2017. Based on the operating results of the Company through the earnout period and the terms of the agreement, there are no amounts owed and recorded as current or long-term liabilities at December 31, 2017 or 2016. The total estimated purchase commitments for tractors, net of tractor sale commitments, and trailer equipment, at December 31, 2017, was $89.0 million.