Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	$ (472)	$ 0
Cash flows from operating activities:
Net income (loss)	25,443	609
Loss from discontinued operations	0	626
Income from continuing operations	25,443	1,235
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	32,046	32,984
Gain on sale of fixed assets	(1,023)	(65)
Equity-based compensation expense	6,847	4,201
Deferred income taxes	1,799	(3,797)
Equity in earnings of affiliated companies	0	(677)
Non-cash restructuring charges	2,127	17,187
Fixed asset impairment	0	11,870
Definite-lived intangible asset impairment	0	10,896
Loss on sale of Video Injection - Insituform SAS	2,864	0
Loss on sale of interests in Bayou Coating, L.L.C.	0	472
Loss on foreign currency transactions	284	149
Other	(860)	881
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash related to operating activities	(2,215)	(142)
Return on equity of affiliated companies	0	684
Receivables net, retainage and costs and estimated earnings in excess of billings	(24,738)	(83,383)
Inventories	3,514	(4,732)
Prepaid expenses and other assets	(17,374)	(5,009)
Accounts payable and accrued expenses	7,023	19,679
Billings in excess of costs and estimated earnings	31,979	5,832
Other operating	810	430
Net cash provided by operating activities of continuing operations	68,526	8,695
Net cash used in operating activities of discontinued operations	0	(90)
Net cash provided by operating activities	68,526	8,605
Cash flows from investing activities:
Capital expenditures	(21,337)	(25,118)
Proceeds from sale of fixed assets	1,706	1,140
Patent expenditures	(1,643)	(1,988)
Purchase of Schultz Mechanical Contractors, Inc.	(6,878)	0
Proceeds from sale of interests in Bayou Coating, L.L.C.	0	9,065
Payment to Fyfe Asia sellers for final net working capital	(1,098)	0
Net cash used in investing activities of continuing operations	(29,250)	(16,901)
Net cash provided by investing activities of discontinued operations	0	90
Net cash used in investing activities	(29,250)	(16,811)
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises, including tax effects	1,299	8,615
Repurchase of common stock	(21,941)	(31,051)
Purchase of non-controlling interest	0	(617)
Payment of earnout related to acquistion of CRTS, Inc.	684	0
Proceeds on notes payable	1,505	1,284
Principal payments on notes payable	(1,875)	0
Proceeds from line of credit	26,000	10,000
Principal payments on long-term debt	(46,122)	(15,477)
Net cash used in financing activities	(42,290)	(27,246)
Effect of exchange rate changes on cash	(4,367)	(6,652)
Net decrease in cash and cash equivalents for the period	(7,381)	(42,104)
Cash and cash equivalents, beginning of period	174,965	158,045
Cash and cash equivalents, end of period	$ 167,584	$ 115,941