Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net (loss) income	$ (94,422)	$ 400	$ (3,620)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	31,799	29,491	34,162
Unamortized Debt Issuance Costs On Debt Extinguishment	2,164	0	0
Deferred financing cost amortization	725	1,269	1,225
Deferred income taxes	(13,194)	(4,166)	751
Stock-based compensation	2,238	2,303	2,280
Gain on sale of property and equipment	(3,306)	(674)	(1,579)
Goodwill impairment charges	69,483	0	0
Allowance for doubtful accounts	4,280	0	0
Other gain from continuing operations	(5,448)	0	0
Change in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	10,936	15,022	(23,935)
Income tax receivable	(128)	(952)	(49)
Inventory	647	89	1,696
Accounts receivable, non-current	0	0	(511)
Prepaid expenses and other	1,671	(226)	856
Costs and estimated earnings in excess of billings on uncompleted contracts	36,789	(6,030)	19,640
Accounts payable	(4,584)	(5,666)	(5,717)
Accrued liabilities	(5,301)	(1,519)	(1,123)
Income tax payable	(256)	(433)	(125)
Billings in excess of costs and estimated earnings on uncompleted contracts	(12,162)	5,225	(802)
Net cash provided by operating activities	21,931	34,133	23,149
Cash flows from investing activities:
Proceeds from sale of property and equipment	3,234	6,826	2,152
Purchase of property and equipment	(17,714)	(10,729)	(18,715)
Acquisition of TAS and purchase price adjustment	0	0	(369)
Acquisition of TBC	0	6,000	0
TBC acquisition adjustment	0	(557)	0
Proceeds from return of investment	94	0	0
Insurance claim proceeds related to property and equipment	1,346	925	0
Contributions to CSV life insurance	260	545	754
Net cash used in investing activities	(13,300)	(10,080)	(17,686)
Cash flows from financing activities:
Borrowings from Credit Facility	39,861	72,000	57,000
Payments made on borrowings from Credit Facility	(48,111)	(87,813)	(63,084)
Loan costs from Credit Facility	(861)	(779)	(486)
Capital lease liability	(2,737)	0	0
Exercise of stock options	2,815	1,320	67
Net cash used in financing activities	(9,033)	(15,272)	(6,503)
Net change in cash and cash equivalents	(402)	8,781	(1,040)
Cash and cash equivalents at beginning of year	9,086	305	1,345
Cash and cash equivalents at end of year	8,684	9,086	305
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	4,819	4,413	5,031
Taxes, net of refunds	903	1,008	999
Capital lease expenditures included in accrued expenses	$ 13,103	$ 0	$ 0