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Guarantees	3 Months Ended
	Mar. 31, 2017
Guarantees [Abstract]
Guarantees	NOTE 6. Guarantees As a recruiting tool for our owner-operators, we are guaranteeing certain owner-operators’ lease payments for tractors.  The guarantees expire at various dates through 2020. The potential maximum exposure under these lease guarantees was approximately $1.0 million and $1.4 million as of March 31, 2017 and December 31, 2016, respectively.  The potential maximum exposure represents the amount of the remaining lease payments on all outstanding guaranteed leases as of March 31, 2017 and December 31, 2016.  However, upon default, we have the option to purchase the tractors.  We could then sell the tractors and use the proceeds to recover all or a portion of the amounts paid under the guarantees.  Alternatively, we can contract with another owner-operator who would assume the lease.  There were no material defaults during the quarter ended March 31, 2017 or the year ended December 31, 2016 and no potential material defaults. We had a liability of five thousand dollars as of March 31, 2017 and nine thousand dollars as of December 31, 2016, representing the fair value for estimated defaults of the guarantees, based on a discounted cash-flow analysis which is included in current and non-current liabilities in our Consolidated Balance Sheets. We are amortizing the amounts over the remaining lives of the respective guarantees.

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The entire disclosure for each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties.

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