Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Net income (loss)	$ 6,349	$ 141	$ (5,789)	$ 5,863
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization			26,530	27,692
Gain on sale of fixed assets			(527)	(423)
Equity-based compensation expense			5,981	6,201
Deferred income taxes			883	647
Non-cash restructuring charges			6,419	5,891
Goodwill impairment	0	1,389	0	1,389
Definite-lived intangible asset impairment	0	870	0	870
Impairment of assets held for sale	0	0	11,946	0
Loss on sale of businesses			0	8,729
Loss on foreign currency transactions			370	1,231
Other			(39)	(119)
Changes in operating assets and liabilities (net of acquisitions):
Receivables net, retainage and contract assets			(1,488)	(19,247)
Inventories			(3,170)	(3,188)
Prepaid expenses and other assets			2,225	678
Accounts payable and accrued expenses			(8,476)	(256)
Contract liabilities			(1,435)	(21,537)
Other operating			(1,779)	(396)
Net cash provided by operating activities			31,651	14,025
Cash flows from investing activities:
Capital expenditures			(21,392)	(22,230)
Proceeds from sale of fixed assets			1,270	955
Patent expenditures			(292)	(197)
Other acquisition activity			0	(9,000)
Sale of Bayou, net of cash disposed			0	37,942
Net cash provided by (used in) investing activities			(20,414)	7,470
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises			956	0
Repurchase of common stock			(28,143)	(18,622)
Distributions to non-controlling interests			(1,409)	0
Credit facility amendment fees			0	(1,093)
Payments on notes payable, net			(273)	(26)
Proceeds from line of credit, net			8,000	(19,000)
Principal payments on long-term debt			(19,688)	(19,688)
Net cash used in financing activities			(40,557)	(58,429)
Effect of exchange rate changes on cash			(970)	(2,366)
Net decrease in cash, cash equivalents and restricted cash for the period			(30,290)	(39,300)
Cash, cash equivalents and restricted cash, beginning of year			84,886	108,545	$ 108,545
Cash, cash equivalents and restricted cash, end of period	$ 54,596	$ 69,245	$ 54,596	$ 69,245	$ 84,886