Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss	$ (3,991)	$ (1,476)
Adjustments to reconcile to net cash provided by (used in) operating activities:
Depreciation and amortization	8,655	9,554
Gain on sale of fixed assets	(308)	(105)
Equity-based compensation expense	2,007	2,158
Deferred income taxes	19	(38)
Non-cash restructuring charges	(151)	2,408
Loss on foreign currency transactions	772	315
Other	63	561
Changes in operating assets and liabilities (net of acquisitions):
Receivables net, retainage and contract assets	10,388	16,584
Inventories	(1,287)	(2,223)
Prepaid expenses and other assets	433	6,657
Accounts payable and accrued expenses	(18,017)	(24,729)
Contract liabilities	(4,307)	(8,860)
Other operating	(873)	470
Net cash provided by (used in) operating activities	(6,597)	1,276
Cash flows from investing activities:
Capital expenditures	(8,064)	(5,189)
Proceeds from sale of fixed assets	293	284
Patent expenditures	(69)	(48)
Net cash used in investing activities	(7,840)	(4,953)
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises	956	0
Repurchase of common stock	(14,220)	(13,670)
Distributions to non-controlling interests	(96)	0
Credit facility amendment fees	0	(1,093)
Payments on notes payable, net	(138)	(568)
Proceeds from line of credit, net	13,000	5,000
Principal payments on long-term debt	(6,563)	(6,563)
Net cash used in financing activities	(7,061)	(16,894)
Effect of exchange rate changes on cash	329	1,870
Net decrease in cash, cash equivalents and restricted cash for the period	(21,169)	(18,701)
Cash, cash equivalents and restricted cash, beginning of year	84,886	108,545
Cash, cash equivalents and restricted cash, end of period	63,717	89,844
Cash, cash equivalents and restricted cash associated with assets held for sale, end of period	0	(813)
Cash, cash equivalents and restricted cash, end of period	$ 63,717	$ 89,031