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Legal Proceedings	9 Months Ended
Legal Proceedings	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Legal Proceedings	LEGAL PROCEEDINGS The Company is party to routine litigation incidental to its business, primarily involving claims for personal injury and property damage incurred in the transportation of freight. The Company maintains insurance to cover liabilities in excess of certain self-insured retention levels. Though management believes these claims to be immaterial to the Company’s long-term financial position, adverse results of one or more of these claims could have a material adverse effect on the Company’s financial position or results of operations in any given reporting period.