Guarantees	12 Months Ended
Dec. 31, 2016
Guarantees [Abstract]
Guarantees	NOTE 12. 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 $1.4 million and $10.3 million as of December 31, 2016 and 2015, respectively. The potential maximum exposure represents the amount of the remaining lease payments on all outstanding guaranteed leases as of December 31, 2016 and 2015. 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 or continue to operate the leased tractor in our company fleet. There were no material defaults during the years ended December 31, 2016 and 2015 and no potential material defaults. We had a liability of approximately nine thousand dollars at December 31, 2016 and $0.1 million as of December 31, 2015, 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.

NOTE 12. 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 $1.4 million and $10.3 million as of December 31, 2016 and 2015, respectively. The potential maximum exposure represents the amount of the remaining lease payments on all outstanding guaranteed leases as of December 31, 2016 and 2015. 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 or continue to operate the leased tractor in our company fleet. There were no material defaults during the years ended December 31, 2016 and 2015 and no potential material defaults.

We had a liability of approximately nine thousand dollars at December 31, 2016 and $0.1 million as of December 31, 2015, 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.