CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net income (loss)	$ 4,746	$ (4,698)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	41,359	37,193
Provision for doubtful accounts	535	(145)
Deferred income tax, net	(603)	499
Share-based compensation	1,805	1,714
Loss (gain) on disposal of assets, net	427	(495)
Asset impairments	588	786
Other	287	83
Changes in operating assets and liabilities:
Accounts and other receivables	(12,130)	7,761
Inventories and prepaid expenses	(1,100)	4,818
Accounts payable and accrued expenses	6,605	186
Insurance and claims accruals	(4,744)	(3,184)
Other long-term assets and liabilities	(219)	(1,055)
Net cash provided by operating activities	37,556	43,463
Investing activities:
Acquisition of Davis Transfer Company (net of cash)	0	(305)
Capital expenditures	(10,716)	(34,675)
Proceeds from sale of property and equipment	3,182	10,183
Net cash used in investing activities	(7,534)	(24,797)
Financing activities:
Borrowings under long-term debt	65,955	85,600
Payments on long-term debt	(65,456)	(102,110)
Principal payments on financing lease obligations	(31,519)	(14,016)
Proceeds from obligation under finance lease	0	12,795
Payments on obligation under finance lease	(1,870)	(1,013)
Payment of debt issuance costs	0	(538)
Net change in bank drafts payable	3,157	(198)
Net payments for tax withholdings for vested stock-based awards	(61)	(78)
Net cash used in financing activities	(29,794)	(19,558)
Increase (decrease) in cash and restricted cash	228	(892)
Cash and restricted cash:
Beginning of period	97	989
End of period	325	97
Supplemental disclosure of cash flow information:
Interest	5,477	6,357
Income taxes	315	1,232
Supplemental disclosure of non-cash investing:
Purchase of revenue equipment included in accounts payable	$ 0	$ 3,019