Consolidated Statements of Cash Flows (Unaudited) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)
Cash flows from operating activities:
Net income	$ 16,840	$ 16,756
Loss from discontinued operations	496	5,898
Income from continuing operations	17,336	22,654
Adjustments to reconcile to net cash (used in) provided by operating activities:
Depreciation and amortization	21,894	18,169
Loss (gain) on sale of fixed assets	(8)	(793)
Equity-based compensation expense	3,120	3,973
Deferred income taxes	(434)	(2,836)
Equity in earnings of affiliated companies	(677)	(2,212)
Gain on sale of interests in German joint venture	0	(11,771)
Loss on sale of interests in Bayou Coating, L.L.C.	472	0
(Gain) loss on foreign currency transactions	134	1,571
Other	2,243	1,926
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	(92)	(16)
Return on equity of affiliated companies	684	2,269
Receivables net, retainage and costs and estimated earnings in excess of billings	(26,771)	(2,263)
Inventories	(1,605)	(6,135)
Prepaid expenses and other assets	(345)	(3,407)
Accounts payable and accrued expenses	2,090	(4,357)
Other operating	984	148
Net cash (used in) provided by operating activities of continuing operations	19,025	16,920
Net cash used in operating activities of discontinued operations	(90)	(8,859)
Net cash (used in) provided by operating activities	18,935	8,061
Cash flows from investing activities:
Capital expenditures	(13,784)	(13,121)
Proceeds from sale of fixed assets	829	1,637
Patent expenditures	(1,730)	(359)
Sale of interests in Bayou Coating, L.L.C.	9,065	0
Total consideration recorded	0	18,300
Net cash provided by (used in) investing activities of continuing operations	(5,620)	6,457
Net cash provided by investing activities of discontinued operations	90	774
Net cash provided by (used in) investing activities	(5,530)	7,231
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises, including tax effects	5,013	901
Repurchase of common stock	(20,661)	(15,822)
Purchase of noncontrolling interest	(617)	0
Business Combination, Contingent Consideration, Amounts Paid	0	2,112
Proceeds on notes payable	0	1,409
Principal payments on long-term debt	(8,915)	(12,500)
Net cash provided by financing activities	(25,180)	(28,124)
Effect of exchange rate changes on cash	(124)	(2,612)
Net decrease in cash and cash equivalents for the period	(11,899)	(15,444)
Cash and cash equivalents, beginning of period	158,045	133,676
Cash and cash equivalents, end of period	$ 146,146	$ 118,232