Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net loss	$ (27,077)	$ (8,973)
Adjustments to reconcile net loss to net cash used in operating activities:
Deferred income tax benefit	(10,233)	(2,623)
Depreciation and amortization	24,541	19,036
(Gains) losses on sale of equipment	2,768	(319)
Share based compensation	1,048	1,456
Other	398	(1,089)
Unrealized loss on equity investment	60	8,363
Changes in operating assets and liabilities:
Receivables	16,566	(14,514)
Prepaid insurance and licenses	(5,545)	(2,642)
Operating supplies	543	(595)
Other assets	1,090	(16,915)
Accounts payable and other accrued liabilities	3,817	9,061
Accrued wages and benefits	(11,322)	4,062
Net cash used in operating activities	(3,346)	(5,692)
Investing activities
Payments for purchases of property and equipment	(46,902)	(50,091)
Proceeds from sales of property and equipment	26,065	10,820
Net cash used in investing activities	(20,837)	(39,271)
Financing activities
Borrowings under lines of credit	121,804	167,471
Payments under lines of credit	(85,900)	(126,300)
Borrowings under long-term debt	31,994	15,948
Payments of long-term debt and finance leases	(47,671)	(21,914)
Tax withholding related to net share settlement of restricted stock awards	(146)	(408)
Proceeds from issuance of common stock under ESPP	619	725
Proceeds from long-term consideration for sale of subsidiary	167	159
Book overdraft	4,004	6,166
Net cash provided by financing activities	24,871	41,847
Net change in cash and cash equivalents	688	(3,116)
Cash and cash equivalents
Beginning of year	2,275	5,695
End of period	2,963	2,579
Supplemental disclosure of cash flow information
Cash paid during the year for interest	6,320	3,597
Cash paid during the year for income taxes		49
Supplemental disclosure of significant noncash investing and financing activities
Property and equipment amounts accrued in accounts payable	$ 2,175	16,450
Uncollected proceeds from asset sales		$ 1,778