Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (1,303)	$ (3,991)
Adjustments to reconcile to net cash used in operating activities:
Depreciation and amortization	9,105	8,655
Gain on sale of fixed assets	(32)	(308)
Equity-based compensation expense	2,000	2,007
Deferred income taxes	(866)	19
Non-cash restructuring charges	463	(151)
Gain on sale of businesses	(436)	0
(Gain) loss on foreign currency transactions	(588)	772
Other	145	63
Changes in operating assets and liabilities (net of acquisitions):
Receivables net, retainage and contract assets	(10,013)	10,388
Inventories	4,431	(1,287)
Prepaid expenses and other assets	(1,346)	433
Accounts payable and accrued expenses	(11,922)	(18,017)
Contract liabilities	2,419	(4,307)
Other operating	(176)	(873)
Net cash used in operating activities	(8,119)	(6,597)
Cash flows from investing activities:
Capital expenditures	(6,134)	(8,064)
Proceeds from sale of fixed assets	125	293
Patent expenditures	(86)	(69)
Sale of businesses, net of cash disposed	3,358	0
Net cash used in investing activities	(2,737)	(7,840)
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises	0	956
Repurchase of common stock	(5,045)	(14,220)
Distributions to non-controlling interests	0	(96)
Payments on notes payable, net	0	(138)
Proceeds from line of credit, net	34,000	13,000
Principal payments on long-term debt	(8,750)	(6,563)
Net cash provided by (used in) financing activities	20,205	(7,061)
Effect of exchange rate changes on cash	(1,291)	329
Net increase (decrease) in cash, cash equivalents and restricted cash for the period	8,058	(21,169)
Cash, cash equivalents and restricted cash, beginning of year	66,222	84,886
Cash, cash equivalents and restricted cash, end of period	$ 74,280	$ 63,717