Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net (loss) income	$ (12,612)	$ (14,560)	$ 20,220
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	20,915	22,608	23,893
Amortization of ROU operating leases	4,813	5,102	5,874
Amortization of ROU finance leases	3,142	2,822	3,324
Write-off of debt issuance costs upon debt modification		790
Amortization of deferred debt issuance costs	424	430	763
Deferred income taxes	13	(9)	17
Stock-based compensation	2,754	2,401	1,998
Gain on disposal of assets, net	(4,970)	(11,418)	(6,185)
Gain on involuntary disposition of assets, net			(2,859)
Allowance for credit losses	322		(487)
Change in operating assets and liabilities:
Accounts receivable	(28,660)	4,703	23,587
Income tax receivable	3	14	543
Inventory	(1,485)	371	148
Prepaid expenses and other	1,645	143	(1,070)
Contract assets	(15,374)	3,742	9,118
Accounts payable	39,370	589	(22,015)
Accrued liabilities	(6,630)	(6,544)	11,092
Operating lease liabilities	(4,748)	(4,940)	(5,399)
Income tax payable	(79)	(38)	(884)
Contract liabilities	10,722	(6,137)	(15,646)
Net cash provided by operating activities	9,565	69	46,032
Cash flows from investing activities:
Proceeds from sale of property and equipment	4,880	27,164	5,944
Purchase of property and equipment	(14,584)	(16,975)	(14,694)
Contributions to CSV life insurance			(99)
Insurance claim proceeds related to property and equipment		440	5,720
Net cash (used in) provided by investing activities	(9,704)	10,629	(3,129)
Cash flows from financing activities:
Borrowings on credit	24,000	53,000	10,000
Payments made on borrowings of credit	(28,274)	(49,120)	(48,204)
Loan costs from Credit Facility	(664)		(389)
Payments of finance lease liabilities	(2,992)	(3,035)	(3,619)
Payments related to tax withholding for stock-based compensation	(440)	(949)	(188)
Exercise of stock options		110
Net cash (used in) provided by financing activities	(8,370)	6	(42,400)
Net change in cash, cash equivalents and restricted cash	(8,509)	10,704	503
Cash, cash equivalents and restricted cash at beginning of period	12,293	1,589	1,086
Cash, cash equivalents and restricted cash at end of period	3,784	12,293	1,589
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	2,923	2,423	3,187
Taxes, net of refunds	$ 533	$ 568	$ 2,174