Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (1,476)	$ 7,753
Adjustments to reconcile to net cash provided by (used in) operating activities:
Depreciation and amortization	9,554	11,852
Gain on sale of fixed assets	(105)	(116)
Equity-based compensation expense	2,158	3,096
Deferred income taxes	(38)	5,533
Non-cash restructuring charges	2,408	42
Loss on foreign currency transactions	315	378
Other	561	(62)
Changes in operating assets and liabilities (net of acquisitions):
Receivables net, retainage and contract assets	16,584	(30,257)
Inventories	(2,223)	(3,491)
Prepaid expenses and other assets	6,657	5,351
Accounts payable and accrued expenses	(24,729)	(9,988)
Contract liabilities	(8,860)	(18,078)
Other operating	470	300
Net cash provided by (used in) operating activities	1,276	(27,687)
Cash flows from investing activities:
Capital expenditures	(5,189)	(3,907)
Proceeds from sale of fixed assets	284	165
Patent expenditures	(48)	(289)
Other acquisition activity, net of cash acquired	0	(9,045)
Net cash used in investing activities	(4,953)	(13,076)
Cash flows from financing activities:
Repurchase of common stock	(13,670)	(10,508)
Payment of contingent consideration	0	(500)
Credit facility amendment fees	(1,093)	0
Principal payments on notes payable	568	0
Proceeds from line of credit, net	5,000	10,000
Principal payments on long-term debt	(6,563)	(4,375)
Net cash used in financing activities	(16,894)	(5,383)
Effect of exchange rate changes on cash	1,870	929
Net decrease in cash, cash equivalents and restricted cash for the period	(18,701)	(45,217)
Cash, cash equivalents and restricted cash, beginning of year	108,545	134,392
Cash, cash equivalents and restricted cash, end of period	89,844	89,175
Cash, cash equivalents and restricted cash associated with assets held for sale, end of period	813	0
Cash, cash equivalents and restricted cash, end of period	$ 89,031	$ 89,175