Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Cash flows from operating activities
Net (loss) income	$ (5,359)	$ (94,422)	$ 400
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	26,096	31,799	29,491
Amortization of ROU operating leases	5,177
Amortization of ROU finance leases	2,312
Unamortized debt issuance costs upon debt modification	399	2,164	0
Amortization of deferred debt issuance costs	453	725	1,269
Deferred income taxes	71	(13,194)	(4,166)
Stock-based compensation	2,753	2,238	2,303
Gain on sale of property and equipment	(1,804)	(3,306)	(674)
Goodwill impairment charges		69,483	0
Allowance for doubtful accounts	0	4,280	0
Other gain from continuing operations	0	(5,448)	0
Change in operating assets and liabilities:
Accounts receivable	(51,709)	10,936	15,022
Income tax receivable	(495)	(128)	(952)
Inventory	503	647	89
Prepaid expenses and other	131	1,671	(226)
Costs and estimated earnings in excess of billings on uncompleted contracts	(32,172)	36,789	(6,030)
Accounts payable	28,894	(4,584)	(5,666)
Accrued liabilities	1,334	(5,301)	(1,519)
Operating lease liabilities	(5,843)
Income tax payable	1,523	(256)	(433)
Billings in excess of costs and estimated earnings on uncompleted contracts	27,020	(12,162)	5,225
Net cash (used in) provided by operating activities	(716)	21,931	34,133
Cash flows from investing activities:
Proceeds from sale of property and equipment	2,015	3,234	6,826
Purchase of property and equipment	(17,199)	(17,714)	(10,729)
Acquisition of TBC	0	0	(6,000)
TBC acquisition adjustment	0	0	(557)
Contributions to CSV life insurance	(721)	(260)	(545)
Proceeds from return of investment		94
Insurance claim proceeds related to property and equipment	2,574	1,346	925
Net cash used in investing activities	(13,331)	(13,300)	(10,080)
Cash flows from financing activities:
Borrowings from Credit Facility	63,000	39,861	72,000
Payments made on borrowings from Credit Facility	(70,210)	(48,111)	(87,813)
Proceeds from sale-leaseback arrangement	18,210
Loan costs from Credit Facility	(1,680)	(861)	(779)
Capital lease liability		(2,737)
Payments of finance lease liabilities	(2,906)
Exercise of stock options	35	2,815	1,320
Net cash used in financing activities	6,449	(9,033)	(15,272)
Net change in cash and cash equivalents	(7,598)	(402)	8,781
Cash and cash equivalents at beginning of period	8,684	9,086	305
Cash and cash equivalents at end of period	1,086	8,684	9,086
Cash and cash equivalents	128	8,684	9,086
Restricted cash	958
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	6,311	4,819	4,413
Taxes, net of refunds	$ 578	903	$ 1,008
Non-cash investing activity
Capital lease expenditures included in accrued expenses		$ 13,103