Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net (loss) income	$ 2,723	$ (7,924)
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	6,192	6,471
Amortization of ROU operating leases	1,673	1,435
Amortization of ROU finance leases	700	569
Amortization of deferred debt issuance costs	123	84
Deferred income taxes	13	34
Stock-based compensation	462	664
Gain on sale of property and equipment	(992)	(374)
Allowance for credit losses	411
Change in operating assets and liabilities:
Accounts receivable	13,511	(9,296)
Income tax receivable	(192)	(133)
Inventory	(218)	210
Prepaid expenses and other	1,540	255
Costs and estimated earnings in excess of billings on uncompleted contracts	9,956	(5,916)
Accounts payable	(22,911)	474
Accrued liabilities	(543)	(1,683)
Operating lease liabilities	(1,348)	(1,435)
Income tax payable	(278)	533
Billings in excess of costs and estimated earnings on uncompleted contracts	4,631	14,104
Net cash (used in) provided by operating activities	15,453	(1,928)
Cash flows from investing activities:
Proceeds from sale of property and equipment	1,302	400
Purchase of property and equipment	(2,753)	(3,862)
Contributions to CSV life insurance	(38)	(301)
Insurance claim proceeds related to property and equipment	1,164
Net cash used in investing activities	(325)	(3,763)
Cash flows from financing activities:
Borrowings from Credit Facility	5,000	11,000
Payments made on borrowings from Credit Facility	(6,750)	(10,750)
Loan costs from Credit Facility		43
Payments of finance lease liabilities	(942)	(696)
Exercise of stock options		35
Net cash used in financing activities	(2,692)	(368)
Net change in cash and cash equivalents	12,436	(6,059)
Cash and cash equivalents at beginning of period	1,086	8,684
Cash and cash equivalents at end of period	13,522	2,625
Cash and cash equivalents	12,591	2,625
Restricted cash	931
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	942	1,190
Taxes, net of refunds	$ 648	$ 151