Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net (loss) income	$ (8,060)	$ 6,877	$ 331
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	28,083	23,451	21,538
Deferred financing cost amortization	462	0	52
Bad debt expense	22	993	259
Deferred income taxes	(2,885)	1,869	(239)
Stock-based compensation	2,275	1,594	2,141
Loss/(gain) on sale of property and equipment	466	(359)	153
Change in contingent liability related to earnout	0	0	(271)
Change in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(2,666)	(4,202)	4,571
Income tax receivable	249	0	2,125
Inventory	1,150	(3,702)	(3,024)
Accounts receivable, long-term	(222)	0	46
Prepaid expenses and other	(467)	(695)	(200)
Costs and estimated earnings in excess of billings on uncompleted contracts	(10,655)	(19,725)	(5,611)
Accounts payable	12,245	(1,178)	(6,405)
Accrued liabilities	1,658	4,428	(808)
Income tax payable	(1,097)	538	207
Billings in excess of costs and estimated earnings on uncompleted contracts	4,655	2,109	(1,774)
Deferred revenue	(34)	(53)	(58)
Net cash provided by operating activities	25,179	11,945	13,033
Cash flows from investing activities:
Proceeds from sale of property and equipment	2,708	1,005	750
Purchase of property and equipment	(20,802)	(18,711)	(12,760)
Net cash used in investing activities	(128,795)	(42,787)	(12,010)
Cash flows from financing activities:
Borrowings from Credit Facility	149,021	30,000	0
Payments made on borrowings from Credit Facility	(42,955)	(1,557)	(4,057)
Extinguishment of debt	(32,427)	0	0
Loan costs from Credit Facility	(4,498)	0
Contributions from noncontrolling interest	0	0	(50)
Exercise of stock options	28	869	859
Purchase of shares into treasury	(3,101)	(436)	0
Net cash provided by (used in) financing activities	66,068	28,876	(3,248)
Net change in cash and cash equivalents	(37,548)	(1,966)	(2,225)
Cash and cash equivalents at beginning of year	38,893	40,859	43,084
Cash and cash equivalents at end of year	1,345	38,893	40,859
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	3,063	742	483
Taxes (net of refunds)	584	770	(3,045)
Acquisition of TAS
Cash flows from investing activities:
Payments for acquisition of businesses	(110,344)	0	0
Houston Industrial Tool Services, Inc.
Cash flows from investing activities:
Payments for acquisition of businesses	(357)	0	0
Acquisition of business in Pacific Northwest
Cash flows from investing activities:
Payments for acquisition of businesses	$ 0	$ (25,081)	$ 0