Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Revenue	$ 1,707,361	$ 1,804,915	$ 1,555,385
Operating expenses
Salaries, wages, and benefits	530,885	535,994	543,735
Fuel and fuel taxes	189,800	227,525	219,515
Vehicle rents	80,064	78,639	74,377
Depreciation and amortization, net of (gain) loss on sale of property	94,337	97,954	93,369
Operating expenses and supplies	118,394	118,064	126,700
Insurance premiums and claims	88,959	85,075	77,430
Operating taxes and licenses	13,849	14,133	13,769
Communications and utilities	8,928	9,575	7,683
General and other operating expenses	75,317	66,412	61,575
Gain on sale of subsidiary	(831)
Impairment of assets held for sale		(10,693)
Total operating expenses	1,681,291	1,726,009	1,526,777
Operating income	26,070	78,906	28,608
Other expense (income)
Interest expense, net	21,635	34,866	49,758
Early extinguishment of debt		7,753
Impairment of equity method investment or note receivable	6,793	1,804
Equity in loss of affiliated companies	270	381	1,350
Other, net	26	136	(1,376)
Nonoperating Income (Expense), Total	(28,724)	(44,940)	(49,732)
Income (loss) before income tax provision	(2,654)	33,966	(21,124)
Income tax provision (benefit)	389	7,860	(17,187)
Net total and comprehensive income (loss)	(3,043)	26,106	(3,937)
Net total and comprehensive income (loss) attributable to noncontrolling interest	604	1,207	123
Net total and comprehensive income(loss) attributable to controlling interest	$ (3,647)	$ 24,899	$ (4,060)
Earnings (loss) per share
Basic earnings (loss) per share (in dollars per share)	$ (0.07)	$ 0.84	$ (0.64)
Basic weighted average shares outstanding (in shares)	48,788	29,470	6,385
Diluted earnings (loss) per share (in dollars per share)	$ (0.07)	$ 0.83	$ (0.64)
Diluted weighted average shares outstanding (in shares)	48,788	30,133	6,385
Cargo and Freight [Member]
Revenues
Revenue	$ 1,538,450	$ 1,622,083	$ 1,417,173
Fuel Surcharge [Member]
Revenues
Revenue	168,911	182,832	138,212
Shipping and Handling [Member]
Operating expenses
Purchased transportation	$ 481,589	$ 481,945	$ 308,624