Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue
Total revenue	$ 88,846	$ 55,726
Operating expenses
Payroll, benefits and related	21,462	27,531
Purchased transportation	9,188	8,093
Fuel	5,368	7,141
Equipment rent	2,555	3,238
Maintenance and supplies	2,250	2,833
General and administrative	5,044	4,944
Operating supplies and expenses	4,088	3,857
Depreciation and amortization	3,624	3,470
Insurance and claims	2,586	2,560
Total operating expenses	56,343	63,853
Operating income (loss)	32,503	(8,127)
Other income (expense)
Interest expense	(4,103)	(3,624)
Change in fair value of embedded derivative liability	788	(45)
Change in fair value of warrant liabilities	3,107	8,235
Gain (loss) on extinguishment of debt	534	(10,086)
Total other income (expense)	326	(5,520)
Income (loss) before income taxes	32,829	(13,647)
(Provision) benefit for income taxes	(1,606)	(55)
Net income (loss)	$ 31,223	$ (13,702)
Earnings Per Share, Basic [Abstract]
Basic	$ 1.06	$ (0.71)
Earnings Per Share, Diluted [Abstract]
Diluted	$ 0.95	$ (0.71)
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Basic	29,342,042	19,902,498
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Diluted	33,214,707	19,902,498
Trucking [Member]
Revenue
Total revenue	$ 53,952	$ 55,406
Other [Member]
Revenue
Total revenue	34,758	0
CNG [Member]
Revenue
Total revenue	136	320
Operating expenses
CNG expenses	$ 178	$ 186