Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net (loss) income	$ (9,138)	$ 2,723
Adjustments to reconcile net (loss) income to net cash provided by
Depreciation and amortization	22,422	25,765
Deferred financing cost amortization	942	921
Deferred income taxes	(5,478)	957
Stock-based compensation	1,800	1,842
Gain on sale of property and equipment	(590)	(1,260)
Change in operating assets and liabilities:
Accounts receivable	19,930	(24,290)
Income tax receivable	(2,203)	0
Inventory	74	1,241
Prepaid expenses and other	1,481	2,127
Costs and estimated earnings in excess of billings on uncompleted contracts	(6,859)	6,888
Accounts payable	2,225	(2,638)
Accrued liabilities	(836)	(1,942)
Income tax payable	2,364	13
Billings in excess of costs and estimated earnings on uncompleted contracts	5,721	1,084
Net cash provided by operating activities	31,855	13,431
Cash flows from investing activities:
Proceeds from sale of property and equipment	6,361	1,737
Contributions to CSV life insurance	(430)	(634)
TAS acquisition adjustment	0	(369)
Acquisition of TBC	(6,000)	0
TBC acquisition adjustment	(557)	0
Purchase of property and equipment	(7,234)	(16,334)
Net cash used in investing activities	(7,860)	(15,600)
Cash flows from financing activities:
Borrowings from Credit Facility	52,000	47,000
Payments made on borrowings from Credit Facility	(74,438)	(42,552)
Loan costs from Credit Facility	(210)	(486)
Exercise of stock options	1,007	8
Net cash (used in) provided by financing activities	(21,641)	3,970
Net change in cash and cash equivalents	2,354	1,801
Cash and cash equivalents at beginning of period	305	1,345
Cash and cash equivalents at end of period	2,659	3,146
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	3,232	3,864
Taxes (net of refunds)	$ 1,067	$ 999