Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 10,220	$ 16,840
Loss from discontinued operations	0	496
Income from continuing operations	10,220	17,336
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	21,097	21,894
Gain on sale of fixed assets	(970)	(8)
Equity-based compensation expense	4,582	3,120
Deferred income taxes	2,001	(434)
Equity in earnings of affiliated companies	0	(677)
Non-cash restructuring charges	1,212	0
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	424	134
Other	(1,391)	2,243
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash related to operating activities	(1,128)	(92)
Return on equity of affiliated companies	0	684
Receivables net, retainage and costs and estimated earnings in excess of billings	(6,410)	(26,771)
Inventories	1,377	(1,605)
Prepaid expenses and other assets	(221)	(345)
Accounts payable and accrued expenses	3,702	(765)
Billings in excess of costs and estimated earnings	21,021	2,855
Other operating	49	984
Net cash provided by operating activities of continuing operations	58,429	19,025
Net cash used in operating activities of discontinued operations	0	(90)
Net cash provided by operating activities	58,429	18,935
Cash flows from investing activities:
Capital expenditures	(12,087)	(13,784)
Proceeds from sale of fixed assets	1,186	829
Patent expenditures	(1,576)	(1,730)
Purchase of Schultz Mechanical Contractors, Inc.	(6,878)	0
Proceeds from sale of interests in Bayou Coating, L.L.C.	0	9,065
Fyfe Asia final working capital settlements, net	(5)	0
Net cash used in investing activities of continuing operations	(19,360)	(5,620)
Net cash provided by investing activities of discontinued operations	0	90
Net cash used in investing activities	(19,360)	(5,530)
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises, including tax effects	1,299	5,013
Repurchase of common stock	(21,926)	(20,661)
Purchase of non-controlling interest	0	(617)
Proceeds on notes payable	1,505	0
Principal payments on notes payable	(1,875)	0
Proceeds from line of credit	26,000	0
Principal payments on long-term debt	(39,593)	(8,915)
Net cash used in financing activities	(34,590)	(25,180)
Effect of exchange rate changes on cash	(6,372)	(124)
Net decrease in cash and cash equivalents for the period	(1,893)	(11,899)
Cash and cash equivalents, beginning of period	174,965	158,045
Cash and cash equivalents, end of period	$ 173,072	$ 146,146