Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income	$ 4,458	$ 4,751
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	11,313	12,311
Amortization of ROU operating leases	2,794	3,066
Amortization of ROU finance leases	1,602	1,585
Write-off of debt issuance costs upon debt extinguishment	790
Amortization of deferred debt issuance costs	429	286
Deferred income taxes	(81)	(99)
Stock-based compensation	1,628	1,629
Gain on disposal of assets, net	(8,971)	(1,361)
Allowance for credit losses		411
Change in operating assets and liabilities:
Accounts receivable	5,147	23,645
Income tax receivable	(682)	(97)
Inventory	277	(172)
Prepaid expenses and other	337	900
Contract assets	9,159	5,050
Accounts payable	(3,754)	(23,680)
Accrued liabilities	(5,290)	2,818
Operating lease liabilities	(2,571)	(2,721)
Income tax payable	(538)	(296)
Contract liabilities	(4,772)	5,048
Net cash provided by operating activities	11,275	33,074
Cash flows from investing activities:
Proceeds from sale of property and equipment	24,737	1,749
Purchase of property and equipment	(4,715)	(5,036)
Contributions to CSV life insurance	0	(99)
Insurance claim proceeds related to property and equipment	440	1,342
Net cash provided by (used in) investing activities	20,462	(2,044)
Cash flows from financing activities:
Borrowings from Credit Facility	20,000	5,000
Payments made on borrowings from Credit Facility	(49,086)	(24,500)
Loan costs from Credit Facility		(391)
Payments of finance lease liabilities	(1,675)	(1,858)
Payments related to tax withholding for stock-based compensation	(241)	(24)
Exercise of stock options	86
Net cash used in by financing activities	(30,916)	(21,773)
Net change in cash and cash equivalents	821	9,257
Cash and cash equivalents at beginning of period	1,589	1,086
Cash and cash equivalents at end of period	2,410	10,343
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	2,064	2,130
Taxes, net of refunds	$ 640	$ 1,663