Restructuring, Impairment and Other Costs - Restructuring Costs by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Payments			$ (131)
Costs Incurred, Net of Adjustments	$ 0	$ 0	(639)	$ 0
Trucking
Restructuring Cost and Reserve [Line Items]
Costs Incurred, Net of Adjustments	0	0	(587)	0
USAT Logistics
Restructuring Cost and Reserve [Line Items]
Costs Incurred, Net of Adjustments	0	0	(52)	0
Executive Severance
Restructuring Cost and Reserve [Line Items]
Payments			(393)
Costs Incurred, Net of Adjustments	0	(82)	(711)	(899)
Executive Severance | Trucking
Restructuring Cost and Reserve [Line Items]
Costs Incurred, Net of Adjustments	0	(56)	(484)	(642)
Executive Severance | USAT Logistics
Restructuring Cost and Reserve [Line Items]
Costs Incurred, Net of Adjustments	$ 0	$ (26)	$ (227)	$ (257)