Aegion 10-Q 30 Jul 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 24, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	Aegion Corp
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		36,238,211
Amendment Flag	false
Entity Central Index Key	353,020
Entity Filer Category	Large Accelerated Filer
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenues	$ 337,096	$ 322,868	$ 646,262	$ 629,102
Cost of revenues	265,043	250,950	515,019	496,121
Gross profit	72,053	71,918	131,243	132,981
Operating expenses	57,326	50,760	106,410	102,689
Acquisition-related expenses	0	539	323	539
Restructuring charges	204	0	862	0
Operating income	14,523	20,619	23,648	29,753
Other income (expense):
Interest expense	(2,989)	(3,320)	(6,221)	(6,435)
Interest income	78	125	204	377
Other	778	(687)	(2,001)	(1,463)
Total other expense	(2,133)	(3,882)	(8,018)	(7,521)
Income before taxes on income	12,390	16,737	15,630	22,232
Taxes on income	3,542	3,961	5,410	5,573
Income before equity in earnings of affiliated companies	8,848	12,776	10,220	16,659
Equity in earnings of affiliated companies	0	0	0	677
Income from continuing operations	8,848	12,776	10,220	17,336
Loss from discontinued operations	0	(364)	0	(496)
Net income	8,848	12,412	10,220	16,840
Non-controlling interests	(164)	(26)	(177)	(57)
Net income attributable to Aegion Corporation	$ 8,684	$ 12,386	$ 10,043	$ 16,783
Basic:
Income from continuing operations (in dollars per share)	$ 0.24	$ 0.34	$ 0.27	$ 0.46
Loss from discontinued operations (in dollars per share)	0	(0.01)	0	(0.01)
Net income (in dollars per share)	0.24	0.33	0.27	0.45
Diluted:
Income from continuing operations (in dollars per share)	0.24	0.33	0.27	0.45
Loss from discontinued operations (in dollars per share)	0	(0.01)	0	(0.01)
Net income (in dollars per share)	$ 0.24	$ 0.32	$ 0.27	$ 0.44

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income		$ 8,848	$ 12,412	$ 10,220	$ 16,840
Other comprehensive income (loss):
Currency translation adjustments		(2,379)	1,864	(18,475)	(780)
Pension activity, net of tax	[1]	(25)	5	(4)	5
Deferred gain (loss) on hedging activity, net of tax	[2]	(25)	78	384	188
Total comprehensive income (loss)		6,419	14,359	(7,875)	16,253
Add: comprehensive income (loss) attributable to non-controlling interests		497	(221)	1,491	(23)
Comprehensive income (loss) attributable to Aegion Corporation		$ 6,916	$ 14,138	$ (6,384)	$ 16,230
[1]	Amounts presented net of tax of $(6) and $1 for the quarters ended June 30, 2015 and 2014, respectively, and $(1) and $1 for the six months ended June 30, 2015 and 2014, respectively.
[2]	Amounts presented net of tax of $(14) and $51 for the quarters ended June 30, 2015 and 2014, respectively, and $256 and $124 for the six months ended June 30, 2015 and 2014, respectively.

Consolidated Statements of Com4

Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Pension activity, tax (benefit) expense	$ (6)	$ 1	$ (1)	$ 1
Deferred gain on hedging activity, tax	$ (14)	$ 51	$ 256	$ 124

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 173,072	$ 174,965
Restricted cash	3,175	2,075
Receivables, net of allowances of $18,484 and $19,307, respectively	216,490	227,481
Retainage	36,592	38,318
Costs and estimated earnings in excess of billings	103,384	94,045
Inventories	56,974	59,192
Prepaid expenses and other current assets	40,643	42,046
Total current assets	630,330	638,122
Property, plant & equipment, less accumulated depreciation	162,592	168,213
Other assets
Goodwill	294,492	293,023
Identified intangible assets, less accumulated amortization	180,482	182,273
Deferred income tax assets	3,029	3,334
Other assets	9,913	10,708
Total other assets	487,916	489,338
Total Assets	1,280,838	1,295,673
Current liabilities
Accounts payable	90,380	83,285
Accrued expenses	105,912	111,617
Billings in excess of costs and estimated earnings	63,406	43,022
Current maturities of long-term debt and line of credit	26,399	26,399
Total current liabilities	286,097	264,323
Long-term debt, less current maturities	336,812	351,076
Deferred income tax liabilities	24,287	22,913
Other non-current liabilities	12,655	12,276
Total liabilities	$ 659,851	$ 650,588
Commitments and contingencies
Equity
Preferred stock, undesignated, $.10 par – shares authorized 2,000,000; none outstanding	$ 0	$ 0
Common stock, $.01 par – shares authorized 125,000,000; shares issued and outstanding 36,227,841 and 37,360,515, respectively	362	374
Additional paid-in capital	201,078	217,289
Retained earnings	443,684	433,641
Accumulated other comprehensive loss	(41,450)	(24,669)
Total stockholders’ equity	603,674	626,635
Non-controlling interests	17,313	18,450
Total equity	620,987	645,085
Total Liabilities and Equity	$ 1,280,838	$ 1,295,673

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 18,484	$ 19,307
Preferred stock, undesignated, par (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, undesignated, shares authorized (in Shares)	2,000,000	2,000,000
Preferred stock, undesignated, shares outstanding (in Shares)	0	0
Common stock, par (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in Shares)	125,000,000	125,000,000
Common stock, shares issued (in Shares)	36,227,841	37,360,515
Common stock, shares outstanding (in Shares)	36,227,841	37,360,515

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Restricted Shares [Member]	Restricted Shares [Member]Common Stock [Member]	Restricted Stock Units [Member]Common Stock [Member]
Balance at Dec. 31, 2013	$ 726,921	$ 380	$ 236,128	$ 470,808	$ 2,052	$ 17,553
Balance (in Shares) at Dec. 31, 2013		37,983,114
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,840			16,783		57
Issuance of common stock upon stock option exercises	5,031	$ 3	5,028
Issuance of common stock upon stock option exercises (in Shares)		322,173
Restricted shares issued							$ 2	$ 2
Restricted shares issued (in Shares)								222,944	15,277
Issuance of shares pursuant to deferred stock unit awards (in Shares)		30,594
Forfeitures of restricted shares	(1)	$ (1)
Forfeitures of restricted shares (in Shares)		(59,632)
Shares repurchased and retired	(20,661)	$ (8)	(20,653)
Shares repurchased and retired (in Shares)		(882,840)
Equity-based compensation expense	3,120		3,120
Purchase of non-controlling interest	(617)		(909)			292
Currency translation adjustment and derivative transactions, net	(587)				(553)	(34)
Balance at Jun. 30, 2014	730,048	$ 376	222,714	487,591	1,499	17,868
Balance (in Shares) at Jun. 30, 2014		37,631,630
Balance at Dec. 31, 2014	$ 645,085	$ 374	217,289	433,641	(24,669)	18,450
Balance (in Shares) at Dec. 31, 2014	37,360,515	37,360,515
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 10,220			10,043		177
Issuance of common stock upon stock option exercises	$ 1,121	$ 1	1,120
Issuance of common stock upon stock option exercises (in Shares)	100,191	100,191
Restricted shares issued (in Shares)									10,856
Issuance of shares pursuant to deferred stock unit awards (in Shares)		12,819
Forfeitures of restricted shares (in Shares)		(45,207)
Shares repurchased and retired	$ (21,926)	$ (13)	(21,913)
Shares repurchased and retired (in Shares)		(1,211,333)
Equity-based compensation expense	4,582		4,582
Currency translation adjustment and derivative transactions, net	(18,095)				(16,781)	(1,314)
Balance at Jun. 30, 2015	$ 620,987	$ 362	$ 201,078	$ 443,684	$ (41,450)	$ 17,313
Balance (in Shares) at Jun. 30, 2015	36,227,841	36,227,841

Consolidated Statements of Cash

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

General

General	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	GENERAL The accompanying unaudited consolidated financial statements of Aegion Corporation and its subsidiaries (collectively, “Aegion” or the “Company”) reflect all adjustments (consisting only of normal recurring adjustments) that are, in the opinion of management, necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the dates and periods presented. Results for interim periods are not necessarily indicative of the results to be expected during the remainder of the current year or for any future period. All significant intercompany related accounts and transactions have been eliminated in consolidation. The consolidated balance sheet as of December 31, 2014, which is derived from the audited consolidated financial statements, and the interim unaudited consolidated financial statements included herein have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), the requirements of Form 10-Q and Article 10 of Regulation S-X and, consequently, do not include all information or footnotes required by GAAP for complete financial statements or all the disclosures normally made in an Annual Report on Form 10-K. Accordingly, the unaudited consolidated financial statements included herein should be read in conjunction with the audited consolidated financial statements and footnotes included in the Company’s 2014 Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 2, 2015. Acquisitions/Strategic Initiatives/Divestitures Infrastructure Solutions Segment On October 6, 2014, the Company’s board of directors approved a realignment and restructuring plan (the “2014 Restructuring”) which included the decision to exit Insituform’s contracting markets in France, Switzerland, India, Hong Kong, Malaysia and Singapore (see Note 3). This decision was made taking into account market size, bid table consistency, supportive governmental bid process, length of cash collection cycles and operating results in each country. The contracting operations in Switzerland and France were sold in December 2014 and February 2015, respectively, as described in more detail below. Activities with respect to Insituform’s contracting operations in Hong Kong, Malaysia and Singapore are substantially complete and expected to be concluded by the end of the third quarter of 2015. Activities with respect to contracting operations in India are expected to be concluded by the end of 2015. In December 2014, and in connection with the 2014 Restructuring, the Company sold its wholly-owned subsidiary, Ka-te Insituform AG (“Ka-te”), the Company’s Swiss contracting operation, to Marco Daetwyler Gruppe AG, a Swiss company. In connection with the sale, the Company entered into a five -year tube supply agreement whereby Ka-te will source liners from Insituform Linings Ltd., the Company’s European manufacturing operation (“Insituform Linings”). Ka-te will also be entitled to continue to use its trade name based on a trade mark license granted for the same five -year time period. In February 2015, and in connection with the 2014 Restructuring, the Company sold its wholly-owned subsidiary, Video Injection - Insituform SAS (“VII”), the Company’s French cured-in-place pipe (“CIPP”) contracting operation, to certain employees of VII. In connection with the sale, the Company entered into a five -year exclusive tube supply agreement whereby VII will source liners from Insituform Linings. VII will also be entitled to continue to use its trade name based on a trade mark license granted for the same five -year time period. Corrosion Protection Segment In July 2015, the Company paid $0.7 million to the sellers of CRTS, Inc. (“CRTS”) related to contingent consideration achieved during the year ended December 31, 2013. This amount was fully accrued as of June 30, 2015 and December 31, 2014. Also, in June 2015, the Company finalized the settlement of escrow claims made pursuant to the CRTS purchase agreement. As a result of the settlement, in July 2015 the Company received proceeds of approximately $1.0 million , of which $0.2 million was recorded as an offset to operating expenses and the remaining $0.8 million was recorded to other income (expense) in the Consolidated Statement of Operations for the quarter and six months ended June 30, 2015. As part of the 2014 Restructuring, the Company made the decision to shutter two older and redundant fusion bonded epoxy coating plants and terminate certain land leases at The Bayou Companies, LLC’s (“Bayou”) Louisiana facility. The actions taken to restructure Bayou’s Louisiana operation are expected to allow Bayou to cost effectively meet market demand for both onshore and offshore projects by optimizing pipe coating activities and reducing fixed costs. The repositioning of Bayou’s Louisiana facility will also include additional capital investments in the remaining coating facilities over the next two to three years to augment Bayou’s competitive position. Prior to March 2014, the Company owned a 49% interest in Bayou Coating, L.L.C (“Bayou Coating”). On March 31, 2014, the Company sold its forty-nine percent ( 49% ) interest in Bayou Coating to Stupp Brothers Inc. (“Stupp”), the holder of a fifty-one percent ( 51% ) interest in Bayou Coating. Stupp purchased the interest by exercising an existing option to acquire the Company’s interest in Bayou Coating at a purchase price equal to $9.1 million , which represented forty-nine percent ( 49% ) of the book value of Bayou Coating as of December 31, 2013. Such book value was determined on the basis of Bayou Coating’s federal information tax return for 2013 and approximated the Company’s book value of its investment in Bayou Coating as of December 31, 2013. During the first quarter of 2014, the difference between the Company’s recorded gross equity in earnings of affiliated companies of approximately $1.2 million and the final equity distribution settlement of $0.7 million resulted in a loss of approximately $0.5 million that is recorded in other income (expense) on the consolidated statement of operations. Prior to March 2014, the Company held a fifty-nine ( 59% ) equity interest in Delta Double Jointing, LLC (“Bayou Delta”) through which the Company offered pipe jointing and other services for the steel-coated pipe industry. The remaining forty-one percent ( 41% ) was held by Bayou Coating. On March 31, 2014, the Company acquired this forty-one percent ( 41% ) interest from Bayou Coating by exercising an existing option at a purchase price equal to $0.6 million . Energy Services Segment On March 1, 2015, the Company acquired all of the equity interests of Schultz Mechanical Contractors, Inc. (“Schultz”), a California corporation, for a total purchase price of $7.9 million . Schultz primarily services customers in California and Arizona and is a provider of piping installations, concrete construction, and excavation and trenching services. Schultz is part of the Company’s Energy Services reportable segment. Purchase Price Accounting The Company accounts for its acquisitions in accordance with FASB ASC 805, Business Combinations. The Company records definite-lived intangible assets at their determined fair value related to customer relationships, backlog, trade names, trademarks, patents and other acquired technologies. Acquisitions generally result in goodwill related to, among other things, synergies, acquired workforce, growth opportunities and market potential. The goodwill and definite-lived intangible assets associated with the Schultz acquisition are deductible for tax purposes. During the second quarter of 2015, the Company finalized its accounting for Schultz. The Schultz acquisition made the following contribution to the Company’s revenues and profits (in thousands): Quarter Ended June 30, 2015 Six Months Ended June 30, 2015 Revenues $ 3,970 $ 4,487 Net loss (19 ) (26 ) The following unaudited pro forma summary presents combined information of the Company as if the Schultz acquisition had occurred at the beginning of the year preceding its acquisition (in thousands): Quarter Ended June 30, 2014 Six Months Ended June 30, 2014 Revenues $ 325,326 $ 633,395 Net income (1) 12,695 17,128 _____________________ (1) Includes pro-forma adjustments for purchase price depreciation and amortization as if those intangibles were recorded at the beginning of the year preceding the acquisition date. Total cash consideration recorded to acquire Schultz was $6.9 million , which was funded by the Company’s cash reserves. The cash consideration included the purchase price paid at closing of $7.1 million less working capital adjustments of $0.2 million . The total purchase price was $7.9 million , which represented the cash consideration of $6.9 million plus $1.0 million of deferred contingent consideration. The following table summarizes the fair value of identified assets and liabilities of the Schultz acquisition at its acquisition date (in thousands): Receivables and cost and estimated earnings in excess of billings $ 1,100 Prepaid expenses and other current assets 19 Property, plant and equipment 162 Identified intangible assets 3,060 Accounts payable, accrued expenses and billings in excess of cost and estimated earnings (461 ) Total identifiable net assets $ 3,880 Total consideration recorded $ 7,878 Less: total identifiable net assets 3,880 Goodwill at June 30, 2015 $ 3,998

Accounting Policies

Accounting Policies	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
Accounting Policies	ACCOUNTING POLICIES Revenues Revenues include construction, engineering and installation revenues that are recognized using the percentage-of-completion method of accounting in the ratio of costs incurred to estimated final costs. Revenues from change orders, extra work and variations in the scope of work are recognized when it is probable that they will result in additional contract revenue and when the amount can be reliably estimated. Contract costs include all direct material and labor costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools and equipment costs. The Company expenses all pre-contract costs in the period these costs are incurred. Since the financial reporting of these contracts depends on estimates, which are assessed continually during the term of these contracts, recognized revenues and profit are subject to revisions as the contract progresses to completion. Revisions in profit estimates are reflected in the period in which the facts that give rise to the revision become known. If material, the effects of any changes in estimates are disclosed in the notes to the consolidated financial statements. When estimates indicate that a loss will be incurred on a contract, a provision for the expected loss is recorded in the period in which the loss becomes evident. Any revenue recognized is only to the extent costs have been recognized in the period. Additionally, the Company expenses all costs for unpriced change orders in the period in which they are incurred. Revenues from the Company’s Energy Services segment are derived mainly from multiple engineering and construction type contracts, as well as maintenance contracts, under multi-year long-term master service agreements and alliance contracts. Businesses within the Company’s Energy Services segment enter into customer contracts that contain three principal types of pricing provisions: time and materials, cost plus fixed fee and fixed price. Although the terms of these contracts vary, most are made pursuant to cost reimbursable contracts on a time and materials basis under which revenues are recorded based on costs incurred at agreed upon contractual rates. These businesses also perform services on a cost plus fixed fee basis under which revenues are recorded based upon costs incurred at agreed upon rates and a proportionate amount of the fixed fee or percentage stipulated in the contract. Foreign Currency Translation For the Company’s international subsidiaries, the local currency is generally the functional currency. Assets and liabilities of these subsidiaries are translated into U.S. dollars using rates in effect at the balance sheet date while revenues and expenses are translated into U.S. dollars using average exchange rates. The cumulative translation adjustment resulting from changes in exchange rates are included in the Consolidated Balance Sheets as a component of accumulated other comprehensive income (loss) in total stockholders’ equity. Net foreign exchange transaction gains (losses) are included in other income (expense) in the Consolidated Statements of Operations. Due to the strengthening of the U.S. dollar, there was a substantial decrease with respect to certain functional currencies and their relation to the U.S. dollar during 2014 and the first six months of 2015, most notably the Canadian dollar, British pound and euro. The Company’s accumulated other comprehensive income is comprised of three main components: (i) currency translation; (ii) derivatives; and (iii) gains and losses associated with the Company’s defined benefit plan in the United Kingdom. As of June 30, 2015 and 2014 , the Company had accumulated comprehensive income (loss) of $(41.9) million and $2.5 million , respectively, related to currency translation adjustments, $(0.1) million and $(0.8) million , respectively, related to derivative transactions and $0.5 million and $(0.2) million , respectively, related to pension activity in accumulated other comprehensive income. Taxation The Company provides for estimated income taxes payable or refundable on current year income tax returns as well as the estimated future tax effects attributable to temporary differences and carryforwards, based upon enacted tax laws and tax rates, and in accordance with FASB ASC 740, Income Taxes (“FASB ASC 740”). FASB ASC 740 also requires that a valuation allowance be recorded against any deferred tax assets that are not likely to be realized in the future. Refer to Note 8 for additional information regarding taxes on income. Long-Lived Assets Property, plant and equipment and other identified intangibles (primarily customer relationships, patents and acquired technologies, trademarks, licenses, contract backlog and non-compete agreements) are recorded at cost, net of accumulated depreciation and impairment, and, except for goodwill and certain trademarks, are depreciated or amortized on a straight-line basis over their estimated useful lives. Changes in circumstances such as technological advances, changes to the Company’s business model or changes in the Company’s capital strategy can result in the actual useful lives differing from the Company’s estimates. If the Company determines that the useful life of its property, plant and equipment or its identified intangible assets should be changed, the Company would depreciate or amortize the net book value in excess of the salvage value over its revised remaining useful life, thereby increasing or decreasing depreciation or amortization expense. Long-lived assets, including property, plant and equipment and other intangibles, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Such impairment tests are based on a comparison of undiscounted cash flows to the recorded value of the asset. The estimate of cash flow is based upon, among other things, assumptions about expected future operating performance. The Company’s estimates of undiscounted cash flow may differ from actual cash flow due to, among other things, technological changes, economic conditions, changes to its business model or changes in its operating performance. If the sum of the undiscounted cash flows (excluding interest) is less than the carrying value, the Company recognizes an impairment loss, measured as the amount by which the carrying value exceeds the fair value of the asset. Goodwill Under FASB ASC 350, the Company assesses recoverability of goodwill on an annual basis or when events or changes in circumstances indicate that the carrying amount of goodwill may not be recoverable. An impairment charge will be recognized to the extent that the implied fair value of a reporting unit is less than its carrying value. Factors that could potentially trigger an impairment review include (but are not limited to): • significant underperformance of a reporting unit relative to expected, historical or forecasted operating results; • significant negative industry or economic trends; • significant changes in the strategy for a segment including extended slowdowns in the reporting unit’s market; • a decrease in market capitalization below the Company’s book value; and • a significant change in regulations. Whether during the annual impairment assessment or during a trigger-based impairment review, the Company determines the fair value of its reporting units and compares such fair value to the carrying value of those reporting units to determine if there are any indications of goodwill impairment. Fair value of reporting units is determined using a combination of two valuation methods: a market approach and an income approach with each method given equal weight in determining the fair value assigned to each reporting unit. Absent an indication of fair value from a potential buyer or similar specific transaction, the Company believes the use of these two methods provides a reasonable estimate of a reporting unit’s fair value. Assumptions common to both methods are operating plans and economic outlooks, which are used to forecast future revenues, earnings and after-tax cash flows for each reporting unit. These assumptions are applied consistently for both methods. The market approach estimates fair value by first determining earnings before interest, taxes, depreciation and amortization (“EBITDA”) multiples for comparable publicly-traded companies with similar characteristics of the reporting unit. The EBITDA multiples for comparable companies are based upon current enterprise value. The enterprise value is based upon current market capitalization and includes a control premium. The Company believes this approach is appropriate because it provides a fair value estimate using multiples from entities with operations and economic characteristics comparable to its reporting units. The income approach is based on forecasted future (debt-free) cash flows that are discounted to present value using factors that consider timing and risk of future cash flows. The Company believes this approach is appropriate because it provides a fair value estimate based upon the reporting unit’s expected long-term operating cash flow performance. Discounted cash flow projections are based on financial forecasts developed from operating plans and economic outlooks, growth rates, estimates of future expected changes in operating margins, terminal value growth rates, future capital expenditures and changes in working capital requirements. Estimates of discounted cash flows may differ from actual cash flows due to, among other things, changes in economic conditions, changes to business models, changes in the Company’s weighted average cost of capital, or changes in operating performance. The discount rate applied to the estimated future cash flows is one of the most significant assumptions utilized under the income approach. The Company determines the appropriate discount rate for each of its reporting units based on the weighted average cost of capital (“WACC”) for each individual reporting unit. The WACC takes into account both the pre-tax cost of debt and cost of equity (a major component of the cost of equity is the current risk-free rate on twenty year U.S. Treasury bonds). As each reporting unit has a different risk profile based on the nature of its operations, including market-based factors, the WACC for each reporting unit may differ. Accordingly, the WACCs are adjusted, as appropriate, to account for company-specific risks associated with each reporting unit. Investments in Affiliated Companies On March 31, 2014, the Company sold its forty-nine percent ( 49% ) interest in Bayou Coating to Stupp, the holder of the remaining fifty-one percent ( 51% ) interest in Bayou Coating. Stupp purchased the interest by exercising an existing option to acquire the Company’s interest in Bayou Coating at a purchase price equal to $9.1 million . During the first quarter of 2014, the difference between the Company’s recorded gross equity in earnings of affiliated companies of approximately $1.2 million and the final equity distribution settlement of $0.7 million resulted in a loss of approximately $0.5 million that is recorded in other income (expense) on the consolidated statement of operations. Prior to March 2014, the Company held a fifty-nine ( 59% ) equity interest in Bayou Delta through which the Company offers pipe jointing and other services for the steel-coated pipe industry. The remaining forty-one percent ( 41% ) was held by Bayou Coating. On March 31, 2014, the Company acquired this forty-one percent ( 41% ) interest from Bayou Coating by exercising its existing option at a purchase price equal to $0.6 million . Investments in entities in which the Company does not have control or is not the primary beneficiary of a variable interest entity, and for which the Company has 20% to 50% ownership or has the ability to exert significant influence, are accounted for by the equity method. At June 30, 2015 and December 31, 2014 , the investment in affiliated companies on the Company’s consolidated balance sheets was zero . Net income presented below for the six months ended June 30, 2014 includes Bayou Coating’s previously held forty-one percent ( 41% ) interest in Bayou Delta, which is eliminated for purposes of determining the Company’s equity in earnings of affiliated companies because Bayou Delta was consolidated in the Company’s financial statements as a result of its additional ownership through another Company subsidiary. The Company’s equity in earnings of affiliated companies for all periods presented below includes acquisition-related depreciation and amortization expense and is net of income taxes associated with these earnings. Financial data for the investment in affiliated companies for the six months ended June 30, 2014 is summarized in the following table (in thousands): Six Months Ended Income statement data (1) June 30, 2014 Revenue $ 9,088 Gross profit 3,489 Net income 2,413 Equity in earnings of affiliated companies 677 __________________________ (1) Includes the results of Bayou Coating through the date of its sale, March 31, 2014. Investments in Variable Interest Entities The Company evaluates all transactions and relationships with variable interest entities (“VIE”) to determine whether the Company is the primary beneficiary of the entities in accordance with FASB ASC 810, Consolidation. The Company’s overall methodology for evaluating transactions and relationships under the VIE requirements includes the following two steps: • determine whether the entity meets the criteria to qualify as a VIE; and • determine whether the Company is the primary beneficiary of the VIE. In performing the first step, the significant factors and judgments that the Company considers in making the determination as to whether an entity is a VIE include: • the design of the entity, including the nature of its risks and the purpose for which the entity was created, to determine the variability that the entity was designed to create and distribute to its interest holders; • the nature of the Company’s involvement with the entity; • whether control of the entity may be achieved through arrangements that do not involve voting equity; • whether there is sufficient equity investment at risk to finance the activities of the entity; and • whether parties other than the equity holders have the obligation to absorb expected losses or the right to receive residual returns. If the Company identifies a VIE based on the above considerations, it then performs the second step and evaluates whether it is the primary beneficiary of the VIE by considering the following significant factors and judgments: • whether the entity has the power to direct the activities of a variable interest entity that most significantly impact the entity’s economic performance; and • whether the entity has the obligation to absorb losses of the entity that could potentially be significant to the variable interest entity or the right to receive benefits from the entity that could potentially be significant to the variable interest entity. Based on its evaluation of the above factors and judgments, as of June 30, 2015 , the Company consolidated any VIEs in which it was the primary beneficiary. Financial data for consolidated variable interest entities are summarized in the following table (in thousands): Balance sheet data June 30, December 31, Current assets $ 52,709 $ 57,046 Non-current assets 41,125 43,165 Current liabilities 19,563 22,525 Non-current liabilities 35,236 36,155 Six Months Ended June 30, Income statement data 2015 2014 Revenue $ 18,295 $ 35,482 Gross profit 1,475 4,475 Net loss (767 ) (341 ) Newly Issued Accounting Pronouncements In April 2015, the FASB issued guidance that amends existing requirements regarding the balance sheet presentation of debt issuance costs as a deduction from the carrying amount of the related debt liability instead of a deferred charge. It is effective for annual reporting periods beginning after December 15, 2015, but early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s presentation of its financial condition. In August 2014, the FASB issued guidance that requires management to assess the Company’s ability to continue as a going concern and to provide related disclosures in certain circumstances. The standard is effective for public companies for annual periods beginning after December 15, 2016 and early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s presentation of its consolidated financial statements. In May 2014, the FASB issued guidance that supersedes revenue recognition requirements regarding contracts with customers to transfer goods or services or for the transfer of nonfinancial assets. Under the new guidance, entities are required to recognize revenue in order to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides a five-step analysis to be performed on transactions to determine when and how revenue is recognized. This new guidance is effective retroactively in fiscal years beginning after December 15, 2017. The Company is currently evaluating the effect the guidance will have on its financial condition and results of operations.

Restructuring

Restructuring	6 Months Ended
	Jun. 30, 2015
Restructuring and Related Activities [Abstract]
Restructuring	RESTRUCTURING On October 6, 2014, the Company’s board of directors approved the 2014 Restructuring to improve gross margins and profitability over the long term by exiting low-return businesses and reducing the size and cost of the Company’s overhead structure. The 2014 Restructuring included exiting certain unprofitable international locations for the Company’s Insituform business, consolidating the Company’s worldwide Fyfe/Fibrwrap business with the Company’s global Insituform business into the Infrastructure Solutions platform and shutting down certain idle facilities in the Company’s Bayou Louisiana coatings operation. As of June 30, 2015, significant progress had been made against all of the aforementioned objectives. Headcount reductions to date total 85 , of which 54 occurred in the first six months of 2015. The Company expects minimal additional headcount reductions to occur throughout the remainder of 2015 as the Company substantially completes its 2014 Restructuring. In December 2014, and in connection with the 2014 Restructuring, the Company sold its wholly-owned subsidiary, Ka-te, the Company’s Swiss contracting operation, to Marco Daetwyler Gruppe AG, a Swiss company. In connection with the sale, the Company entered into a five -year tube supply agreement whereby Ka-te will source liners from Insituform Lining. Ka-te will also be entitled to continue to use its trade name based on a trade mark license granted for the same five -year time period. In February 2015, and in connection with the 2014 Restructuring, the Company sold its wholly-owned subsidiary, VII, the Company’s French CIPP contracting operation, to certain employees of VII. In connection with the sale, the Company entered into a five -year exclusive tube supply agreement whereby VII will source liners from Insituform Lining. VII will also be entitled to continue to use its trade name based on a trade mark license granted for the same five -year time period. During the quarter and six-month period ended June 30, 2015, the Company recorded pre-tax expense related to the 2014 Restructuring as follows (in thousands): Quarter Ended June 30, 2015 Six Months Ended June 30, 2015 Severance and benefit related costs $ 178 $ 694 Lease termination costs 26 168 Allowances for doubtful accounts 2,290 1,291 Currency translation 411 820 Other restructuring costs (1) 2,789 6,259 Total pre-tax restructuring charges (2) $ 5,694 $ 9,232 __________________________ (1) Includes charges related to the write-off of certain other assets, including the loss on the CIPP contracting operation in France, professional fees and certain other restructuring charges. (2) All charges for the quarter and six-month period ended June 30, 2015 relate to the Infrastructure Solutions reportable segment. Restructuring costs related to severance, other termination benefit costs and early lease termination costs for the quarter and six-month period ended June 30, 2015 were $0.2 million and $0.9 million , respectively, and are reported on a separate line in the Consolidated Statements of Operations in accordance with FASB ASC 420, Exit or Disposal Cost Obligations . The following tables summarize all restructuring charges recognized in the quarter and six-month period ended June 30, 2015 as presented in their affected line in the Consolidated Statements of Operations (in thousands): Quarter Ended June 30, 2015 Six Months Ended June 30, 2015 Other Non-Cash Restructuring Charges Cash Restructuring Charges (Reversals) (1) Total Other Cash (1) Total Cost of revenues $ 35 $ 933 $ 968 $ (132 ) $ 1,114 $ 982 Operating expenses 2,290 2,210 4,500 1,270 3,362 4,632 Restructuring charges — 204 204 — 862 862 Other expense 246 (224 ) 22 2,938 (182 ) 2,756 Total pre-tax restructuring charges (2) $ 2,571 $ 3,123 $ 5,694 $ 4,076 $ 5,156 $ 9,232 __________________________ (1) Cash charges consist of charges incurred during the period that will be settled in cash, either during the current period or future periods. (2) All charges for the quarter and six-month period ended June 30, 2015 relate to the Infrastructure Solutions reportable segment. Total pre-tax restructuring charges to date were $58.7 million ( $43.8 million post-tax) and consisted of non-cash charges totaling $47.9 million and cash charges totaling $10.8 million . The non-cash charges of $47.9 million included $22.2 million related to the impairment of certain long-lived assets and definite-lived intangible assets for Bayou’s coatings operation in Louisiana, which is reported in the Corrosion Protection reportable segment, and $25.7 million related to inventory obsolescence, impairment of definite-lived intangible assets, allowances for doubtful accounts receivable, currency translation adjustments, write-off of certain other current assets and long-lived assets as well as a legal accrual related to disputed work performed by our European and Asia-Pacific operations, which are reported in the Infrastructure Solutions reportable segment. The cash charges of $10.8 million included employee severance, retention, extension of benefits, employment assistance programs, early lease termination costs and other costs associated with the restructuring of Insituform’s European and Asia-Pacific operations and Fyfe’s worldwide business. Estimated remaining cash costs to be incurred in 2015 for the 2014 Restructuring are approximately $2.0 million related to severance and benefits costs and other restructuring costs. The following table summarizes the 2014 Restructuring activity during the first six months of 2015 (in thousands): Utilized Reserves at December 31, 2014 Charge to Income Foreign Currency Translation Cash (1) Non-Cash Reserves at June 30, 2015 Severance and benefit related costs $ 466 $ 694 $ (3 ) $ 975 $ — $ 182 Lease termination expenses — 168 (2 ) 166 — — Allowances for doubtful accounts 11,464 1,291 (72 ) — 2,785 9,898 Currency translation — 820 — — 820 — Other restructuring costs 2,496 6,259 (70 ) 3,541 2,032 3,112 Total pre-tax restructuring charges $ 14,426 $ 9,232 $ (147 ) $ 4,682 $ 5,637 $ 13,192 __________________________ (1) Refers to cash utilized to settle charges, either those reserved at December 31, 2014 or charged to income during the current period.

Share Information

Share Information	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Share Information	SHARE INFORMATION Earnings per share have been calculated using the following share information: Quarters Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Weighted average number of common shares used for basic EPS 36,468,374 37,893,170 36,886,777 37,928,548 Effect of dilutive stock options and restricted and deferred stock unit awards 314,797 357,028 266,394 378,099 Weighted average number of common shares and dilutive potential common stock used in dilutive EPS 36,783,171 38,250,198 37,153,171 38,306,647 The Company excluded 164,014 and 200,725 stock options for the quarters ended June 30, 2015 and 2014 , respectively, and 286,251 and 200,725 stock options for the six-month periods ended June 30, 2015 and 2014, respectively, from the diluted earnings per share calculations for the Company’s common stock because they were anti-dilutive as their exercise prices were greater than the average market price of common shares for each period.

Goodwill and Identified Intangi

Goodwill and Identified Intangible Assets	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Identified Intangible Assets	GOODWILL AND IDENTIFIED INTANGIBLE ASSETS Goodwill and identified intangible assets consist of the following: Goodwill (in thousands) Infrastructure Corrosion Energy Total Beginning balance at January 1, 2015 $ 177,275 $ 39,500 $ 76,248 $ 293,023 Additions to goodwill through acquisitions (1) — — 3,998 3,998 Foreign currency translation (1,800 ) (729 ) — (2,529 ) Balance at June 30, 2015 $ 175,475 $ 38,771 $ 80,246 $ 294,492 __________________________ (1) During the first and second quarters of 2015, the Company recorded goodwill of $3.6 million and $0.4 million , respectively, related to the acquisition of Schultz Mechanical Contractors, Inc. (see Note 1). Identified Intangible Assets (in thousands) June 30, 2015 December 31, 2014 Weighted Average Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount License agreements 5 $ 3,902 $ (3,203 ) $ 699 $ 3,908 $ (3,131 ) $ 777 Backlog 0 4,720 (4,720 ) — 4,731 (4,731 ) — Leases 12 2,067 (692 ) 1,375 2,067 (623 ) 1,444 Trademarks (1) 15 22,509 (5,728 ) 16,781 21,722 (5,199 ) 16,523 Non-competes (1) 3 1,210 (890 ) 320 1,140 (839 ) 301 Customer relationships (1) 13 165,288 (37,015 ) 128,273 163,386 (32,196 ) 131,190 Patents and acquired technology 15 55,579 (22,545 ) 33,034 54,090 (22,052 ) 32,038 $ 255,275 $ (74,793 ) $ 180,482 $ 251,044 $ (68,771 ) $ 182,273 __________________________ (1) During the first quarter of 2015, the Company recorded customer relationships, trademarks and non-competes of $2.3 million , $0.7 million and $0.1 million , respectively, related to the acquisition of Schultz Mechanical Contractors, Inc. (see Note 1). Amortization expense was $3.2 million and $3.6 million for the quarters ended June 30, 2015 and 2014 , respectively, and $6.4 million and $7.0 million for the six-month periods ended June 30, 2015 and 2014, respectively. Estimated amortization expense by year is as follows (in thousands): 2015 $ 13,002 2016 13,239 2017 13,244 2018 13,076 2019 12,933

Long-Term Debt and Credit Facil

Long-Term Debt and Credit Facility	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Long-Term Debt and Credit Facility	LONG-TERM DEBT AND CREDIT FACILITY Financing Arrangements In July 2013, the Company entered into a $650.0 million senior secured credit facility (the “Credit Facility”) with a syndicate of banks. Bank of America, N.A. served as the administrative agent. Merrill Lynch Pierce Fenner & Smith Incorporated, JPMorgan Securities LLC and U.S. Bank National Association acted as joint lead arrangers and joint book managers in the syndication of the Credit Facility. The Credit Facility consists of a $300.0 million five -year revolving line of credit and a $350.0 million five -year term loan facility, each with a maturity date of July 1, 2018. The Company borrowed the entire term loan and drew $35.5 million against the revolving line of credit from the Credit Facility on July 1, 2013 for the following purposes: (i) to pay the $147.6 million cash purchase price for the Company’s acquisition of Brinderson, L.P. and related entities (“Brinderson”), which closed on July 1, 2013; (ii) to retire $232.3 million in indebtedness outstanding under the Company’s prior credit facility; and (iii) to fund expenses associated with the Credit Facility and the Brinderson acquisition. Additionally, the Company used $7.0 million of its cash on hand to fund these transactions. Generally, interest will be charged on the principal amounts outstanding under the Credit Facility at the British Bankers Association LIBOR rate plus an applicable rate ranging from 1.25% to 2.25% depending on the Company’s consolidated leverage ratio. The Company can also opt for an interest rate equal to a base rate (as defined in the credit documents) plus an applicable rate, which also is based on the Company’s consolidated leverage ratio. The applicable one month LIBOR borrowing rate (LIBOR plus Company’s applicable rate) as of June 30, 2015 was approximately 2.14% . The Company’s indebtedness at June 30, 2015 consisted of $279.8 million outstanding from the $350.0 million term loan under the Credit Facility and $71.5 million on the line of credit under the Credit Facility. Additionally, the Company designated $11.8 million of debt held by its joint venture partners (representing funds loaned by its joint venture partners) as third-party debt in the consolidated financial statements and held $0.1 million of third-party notes and bank debt at June 30, 2015 . Beginning with the year ended December 31, 2014, the Credit Facility requires an annual mandatory prepayment against the term loan obligation in an amount equal to 50% of the Excess Cash Flow, as defined by the Credit Facility, if the Company’s Consolidated Leverage Ratio is greater than 2.50 to 1.0, as of the end of that fiscal year. The Company’s Consolidated Leverage Ratio at December 31, 2014 was 2.90 to 1.0. On March 31, 2015, the Company made the required term loan prepayment in the amount of $26.5 million , utilizing $26.0 million from the line of credit to fund the term loan prepayment obligation. As of June 30, 2015 , the Company had $27.0 million in letters of credit issued and outstanding under the Credit Facility. Of such amount, $10.2 million was collateral for the benefit of certain of our insurance carriers and $16.8 million was for letters of credit or bank guarantees of performance or payment obligations of foreign subsidiaries. The Company’s indebtedness at December 31, 2014 consisted of $319.4 million outstanding from the term loan under the Credit Facility and $45.5 million on the line of credit under the Credit Facility. Additionally, the Company designated $12.4 million of debt held by its joint ventures (representing funds loaned by its joint venture partners) as third-party debt in the consolidated financial statements and held $0.1 million of third-party notes and bank debt at December 31, 2014 . At June 30, 2015 and December 31, 2014 , the estimated fair value of the Company’s long-term debt was approximately $363.2 million and $377.0 million , respectively. Fair value was estimated using market rates for debt of similar risk and maturity and a discounted cash flow model, which are based on Level 3 inputs as defined in Note 12. In July 2013, the Company entered into an interest rate swap agreement for a notional amount of $175.0 million that is set to expire in July 2016. The notional amount of this swap mirrors the amortization of a $175.0 million portion of the Company’s $350.0 million term loan drawn from the Credit Facility. The swap requires the Company to make a monthly fixed rate payment of 0.87% calculated on the amortizing $175.0 million notional amount and provides for the Company to receive a payment based upon a variable monthly LIBOR interest rate calculated on the same notional amount. The annualized borrowing rate of the swap at June 30, 2015 was approximately 2.23% . The receipt of the monthly LIBOR-based payment offsets a variable monthly LIBOR-based interest cost on a corresponding $175.0 million portion of the Company’s term loan from the Credit Facility. This interest rate swap is used to partially hedge the interest rate risk associated with the volatility of monthly LIBOR rate movement and is accounted for as a cash flow hedge. The Credit Facility is subject to certain financial covenants including a consolidated financial leverage ratio and consolidated fixed charge coverage ratio. On October 6, 2014, the Company amended the Credit Facility’s defined terms for income and fixed charges to allow for the add-back of certain cash and non-cash charges related to the 2014 Restructuring when calculating the Company’s compliance with the consolidated financial leverage ratio and consolidated fixed charge coverage ratio. Subject to specifically defined terms and methods of calculation set forth in the Credit Facility’s credit agreement, as amended, the financial covenant requirements, as of each quarterly reporting period end, are defined as follows: • Consolidated financial leverage ratio compares consolidated funded indebtedness to Credit Facility defined income. The maximum amount decreased, as scheduled, to not more than 3.25 to 1.00 effective with the quarter ended June 30, 2015. At June 30, 2015 , the Company’s consolidated financial leverage ratio was 2.96 to 1.00 , and using the Credit Facility defined income, the Company had the capacity to borrow up to approximately $35.1 million of additional debt. • Consolidated fixed charge coverage ratio compares Credit Facility defined income to Credit Facility defined fixed charges with a minimum permitted ratio of not less than 1.25 to 1.00 . At June 30, 2015 , the Company’s fixed charge ratio was 1.31 to 1.00 . At June 30, 2015 , the Company was in compliance with all of its debt and financial covenants as required under the Credit Facility.

Stockholders' Equity and Equity

Stockholders' Equity and Equity Compensation	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
Stockholders' Equity and Equity Compensation	STOCKHOLDERS’ EQUITY AND EQUITY COMPENSATION Share Repurchase Plan In February 2015, the Company’s board of directors authorized the open market repurchase of up to $20.0 million of the Company’s common stock during 2015. Once a repurchase is complete, the Company promptly retires the shares. The Company is also authorized to utilize up to $10.0 million in cash to purchase shares of the Company’s common stock in each calendar year in connection with the Company’s equity compensation programs for employees. The participants in the Company’s equity plans may surrender shares of common stock in satisfaction of tax obligations arising from the vesting of restricted stock awards under such plans and in connection with the exercise of stock option awards. The deemed price paid is the closing price of the Company’s common stock on the Nasdaq Global Select Market on the date that the restricted stock vests or the shares of the Company’s common stock are surrendered in exchange for stock option exercises. The option holder may elect a “net, net” exercise in connection with the exercise of employee stock options such that the option holder receives a number of shares equal to (1) the built-in gain in the option shares divided by the market price of the Company’s common stock on the date of exercise, less (2) a number of shares equal to the taxes due upon the exercise of the option divided by the market price of the Company’s common stock on the date of exercise. The shares of Company common stock surrendered to the Company for taxes due on the exercise of the option are deemed repurchased by the Company. During the six months ended June 30, 2015 , the Company acquired 1,091,122 shares of the Company’s common stock for $20.0 million ( $18.33 average price per share) through the open market repurchase program discussed above and 31,377 shares of the Company’s common stock for $0.5 million ( $16.96 average price per share) in connection with the satisfaction of tax obligations from the vesting of restricted stock and the exercise of stock options. In addition, during the six months ended June 30, 2015 , the Company acquired 88,834 shares of the Company’s common stock in connection with “net, net” exercises of employee stock options for a gross value of $1.4 million ( $0.1 million in cash value). Once repurchased, the Company immediately retired all such shares. Equity-Based Compensation Plans At June 30, 2015 , the Company had two active equity-based compensation plans under which awards may be made, including stock appreciation rights, restricted shares of common stock, performance awards, stock options and stock units. The Company’s 2013 Employee Equity Incentive Plan (the “2013 Employee Plan”) has 2,895,000 shares of the Company’s common stock reserved for issuance and, at June 30, 2015 , 1,019,009 shares of common stock were available for issuance. The Company’s 2011 Non-Employee Director Equity Incentive Plan (“2011 Director Plan”) has 250,000 shares of the Company’s common stock registered for issuance and, at June 30, 2015 , 72,654 shares of common stock were available for issuance. Stock Awards Stock awards, which include shares of restricted stock, restricted stock units and restricted performance units, are awarded from time to time to executive officers and certain key employees of the Company. Stock award compensation is recorded based on the award date fair value and charged to expense ratably through the requisite service period. The forfeiture of unvested restricted stock, restricted stock units and restricted performance units causes the reversal of all previous expense recorded as a reduction of current period expense. The following table summarizes all stock award activity during the six months ended June 30, 2015 : Stock Awards Weighted Average Award Date Fair Value Outstanding at January 1, 2015 767,540 $ 21.93 Restricted shares awarded — — Restricted stock units awarded 691,781 17.25 Restricted shares distributed (87,600 ) 19.07 Restricted stock units distributed (10,856 ) 19.17 Restricted shares forfeited (45,207 ) 23.64 Restricted stock units forfeited (27,950 ) 20.06 Outstanding at June 30, 2015 1,287,708 $ 19.62 Expense associated with stock awards was $2.0 million and $1.0 million for the quarters ended June 30, 2015 and 2014 , respectively, and $3.5 million and $1.9 million for the six-month periods ended June 30, 2015 and 2014, respectively. Unrecognized pre-tax expense of $18.2 million related to stock awards is expected to be recognized over the weighted average remaining service period of 2.25 years for awards outstanding at June 30, 2015 . Deferred Stock Unit Awards Deferred stock units are generally awarded to directors of the Company and represent the Company’s obligation to transfer one share of the Company’s common stock to the grantee at a future date and are generally fully vested on the date of grant. The expense related to the issuance of deferred stock units is recorded as of the date of the award. The following table summarizes all deferred stock unit activity during the six months ended June 30, 2015 : Deferred Stock Units Weighted Average Award Date Fair Value Outstanding at January 1, 2015 221,471 $ 20.10 Awarded 51,199 18.61 Distributed (12,819 ) 19.89 Outstanding at June 30, 2015 259,851 $ 19.81 Expense associated with awards of deferred stock units for the quarters and six months ended June 30, 2015 and 2014 was $0.9 million and $0.8 million , respectively. Stock Options Stock options on the Company’s common stock are awarded from time to time to executive officers and certain key employees of the Company. Stock options granted generally have a term of seven to ten years and an exercise price equal to the market value of the underlying common stock on the date of grant. The following table summarizes all stock option activity during the six months ended June 30, 2015 : Shares Weighted Average Exercise Price Outstanding at January 1, 2015 503,134 $ 18.18 Granted — — Exercised (100,191 ) 12.97 Canceled/Expired (5,546 ) 24.21 Outstanding at June 30, 2015 397,397 $ 19.41 Exercisable at June 30, 2015 392,338 $ 19.44 Expense associated with stock option grants was $0.0 million and $0.1 million in the quarters ended June 30, 2015 and 2014 , respectively, and $ 0.1 million and $0.5 million for the six months ended June 30, 2015 and 2014 , respectively. Unrecognized pre-tax expense related to stock option grants was immaterial and expected to be recognized over the weighted average remaining contractual term of 1.09 years for awards outstanding at June 30, 2015 . Financial data for stock option exercises are summarized in the following table (in thousands): Six Months Ended June 30, 2015 2014 Amount collected from stock option exercises $ 1,299 $ 7,645 Total intrinsic value of stock option exercises 273 3,088 Tax shortfall (benefit) of stock option exercises recorded in additional paid-in-capital 100 (459 ) Aggregate intrinsic value of outstanding stock options 744 3,452 Aggregate intrinsic value of exercisable stock options 738 3,113 The intrinsic value calculations are based on the Company’s closing stock price of $18.94 and $23.27 on June 30, 2015 and 2014 , respectively. The Company uses a binomial option-pricing model for valuation purposes to reflect the features of stock options granted. Volatility, expected term and dividend yield assumptions were based on the Company’s historical experience. The risk-free rate was based on a U.S. treasury note with a maturity similar to the option grant’s expected term. There were no stock options awarded during the six-month period ended June 30, 2015. The fair value of stock options awarded during the six-month period ended June 30, 2014 was estimated at the date of grant based on the assumptions presented in the table below: Six Months Ended June 30, 2014 Grant-date fair value $11.27 Volatility 41.6% Expected term (years) 7.0 Dividend yield —% Risk-free rate 2.3%

Taxes on Income

Taxes on Income	6 Months Ended
	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Taxes on Income	TAXES ON INCOME The effective tax rate in the quarter and six-month period ended June 30, 2015 was unfavorably impacted by a relatively small income tax benefit recorded on pre-tax charges related to the 2014 Restructuring and the impact of discrete tax items that were related to non-deductible restructuring charges. The Company’s effective tax rate for continuing operations was 28.6% and 23.7% in the quarters ended June 30, 2015 and 2014, respectively, and 34.6% and 25.1% in the six-month periods ended June 30, 2015 and 2014, respectively. In addition to the items noted in the preceding paragraph, the high effective tax rate on pre-tax income for the quarter and six-month period ended June 30, 2015 was also negatively influenced by recording no tax benefit on losses in jurisdictions where valuation allowances were recorded against deferred tax assets.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Litigation The Company is involved in certain litigation incidental to the conduct of its business and affairs. Management, after consultation with legal counsel, does not believe that the outcome of any such litigation, individually or in the aggregate, will have a material adverse effect on the Company’s consolidated financial condition, results of operations or cash flows. Contingencies In connection with the Brinderson acquisition, certain pre-acquisition matters were identified during 2014 whereby a loss is both probable and reasonably estimable. The Company identified the range of possible loss from zero to $24 million . The Company establishes liabilities in accordance with FASB ASC Subtopic No. 450-20, Contingencies – Loss Contingencies , and accordingly, recorded a $14.5 million accrual for such matters in the second quarter of 2014 as part of its purchase price accounting for Brinderson. During the second quarter of 2015, the Company reached a preliminary settlement on one of the outstanding matters. As a result, the Company lowered its accrual for such matter by $0.4 million , which resulted in an offset to operating expense in the Consolidated Statement of Operations. The remaining accrual of $14.1 million as of June 30, 2015 represents the Company’s reasonable estimate of probable loss related to certain pre-acquisition matters for Brinderson. The Company believes it has meritorious defenses against certain of these remaining matters. Purchase Commitments The Company had no material purchase commitments at June 30, 2015 . Guarantees The Company has many contracts that require the Company to indemnify the other party against loss from claims, including claims of patent or trademark infringement or other third party claims for injuries, damages or losses. The Company has agreed to indemnify its surety against losses from third-party claims of subcontractors. The Company has not previously experienced material losses under these provisions and, while there can be no assurances, currently does not anticipate any future material adverse impact on its consolidated financial position, results of operations or cash flows. The Company regularly reviews its exposure under all its engagements, including performance guarantees by contractual joint ventures and indemnification of its surety. As a result of the most recent review, the Company has determined that the risk of material loss is remote under these arrangements and has not recorded a liability for these risks at June 30, 2015 on its consolidated balance sheet.

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Segment Reporting	SEGMENT REPORTING Effective in the fourth quarter of 2014, the Company realigned its existing three operating segments, which are also its reportable segments: Infrastructure Solutions; Corrosion Protection; and Energy Services. The Company’s operating segments correspond to its management organizational structure. Each operating segment has a president who reports to the Company’s chief executive officer, who is also the chief operating decision manager (“CODM”). The operating results and financial information reported by each of the segments are evaluated separately, regularly reviewed and used by the CODM to evaluate segment performance, allocate resources and determine management incentive compensation. The following disaggregated financial results have been prepared using a management approach that is consistent with the basis and manner with which management internally disaggregates financial information for the purpose of making internal operating decisions. Financial results for discontinued operations have been removed for all periods presented. The Company evaluates performance based on stand-alone operating income (loss). Financial information by segment was as follows (in thousands): Quarters Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Revenues: Infrastructure Solutions $ 149,091 $ 147,260 $ 271,564 $ 269,584 Corrosion Protection 106,022 102,923 207,765 210,931 Energy Services 81,983 72,685 166,933 148,587 Total revenues $ 337,096 $ 322,868 $ 646,262 $ 629,102 Gross profit: Infrastructure Solutions (1) $ 39,031 $ 35,951 $ 67,646 $ 61,505 Corrosion Protection 21,887 25,034 42,716 49,175 Energy Services 11,135 10,933 20,881 22,301 Total gross profit $ 72,053 $ 71,918 $ 131,243 $ 132,981 Operating income: Infrastructure Solutions (2) $ 12,115 $ 12,876 $ 19,447 $ 14,334 Corrosion Protection 936 5,277 1,436 8,968 Energy Services 1,472 2,466 2,765 6,451 Total operating income $ 14,523 $ 20,619 $ 23,648 $ 29,753 _______________________ (1) Includes charges of $1.0 million and $1.1 million in the quarter and six months ended June 30, 2015, respectively, related to the 2014 Restructuring (see Note 3). (2) Includes charges of $5.7 million and $6.5 million in the quarter and six months ended June 30, 2015, respectively, related to the 2014 Restructuring (see Note 3). The following table summarizes revenues, gross profit and operating income by geographic region (in thousands): Quarters Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Revenues (1) : United States $ 252,834 $ 227,618 $ 475,975 $ 438,248 Canada 39,400 42,212 86,052 84,075 Europe 13,646 21,175 27,763 43,791 Other foreign 31,216 31,863 56,472 62,988 Total revenues $ 337,096 $ 322,868 $ 646,262 $ 629,102 Gross profit: United States $ 54,639 $ 50,891 $ 92,493 $ 92,284 Canada 8,491 9,934 20,680 18,996 Europe 3,835 4,543 8,060 9,301 Other foreign 5,088 6,550 10,010 12,400 Total gross profit $ 72,053 $ 71,918 $ 131,243 $ 132,981 Operating income (loss): United States $ 10,644 $ 11,693 $ 7,724 $ 14,089 Canada 4,836 6,129 13,442 11,552 Europe 469 851 1,940 1,378 Other foreign (1,426 ) 1,946 542 2,734 Total operating income $ 14,523 $ 20,619 $ 23,648 $ 29,753 __________________________ (1) Revenues are attributed to the country of origin for the Company’s legal entities. For a significant majority of its legal entities, the country of origin relates to the country or geographic area that it services.

Discontinued Operations

Discontinued Operations	6 Months Ended
	Jun. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS During the second quarter of 2013, the Company’s board of directors approved a plan of liquidation for its Bayou Welding Works (“BWW”) business in an effort to improve the Company’s overall financial performance and align the operations with its long-term strategic initiatives. BWW provided specialty welding and fabrication services from its facility in Louisiana. As of December 31, 2014, the Company finalized the liquidation for the BWW business, and accordingly, had no impact from discontinued operations in the financial results during the first six months of 2015.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	DERIVATIVE FINANCIAL INSTRUMENTS As a matter of policy, the Company uses derivatives for risk management purposes, and does not use derivatives for speculative purposes. From time to time, the Company may enter into foreign currency forward contracts to hedge foreign currency cash flow transactions. For cash flow hedges, a gain or loss is recorded in the consolidated statements of operations upon settlement of the hedge. All of the Company’s hedges that are designated as hedges for accounting purposes were highly effective; therefore, no notable amounts of hedge ineffectiveness were recorded in the Company’s consolidated statements of operations for the outstanding hedged balance. During each of the quarters ended June 30, 2015 and 2014 , the Company recorded less than $0.1 million as a gain on the consolidated statements of operations in the other income (expense) line item upon settlement of the cash flow hedges. At June 30, 2015 , the Company recorded a net deferred gain of $0.7 million related to the cash flow hedges in other current assets and other comprehensive income on the consolidated balance sheets and on the foreign currency translation adjustment and derivative transactions line of the consolidated statements of equity. The Company presents derivative instruments in the consolidated financial statements on a gross basis. The gross and net difference of derivative instruments are considered to be immaterial to the financial position presented in the financial statements. The Company engages in regular inter-company trade activities and receives royalty payments from its wholly-owned Canadian entities, paid in Canadian dollars, rather than the Company’s functional currency, U.S. dollars. The Company utilizes foreign currency forward exchange contracts to mitigate the currency risk associated with the anticipated future payments from its Canadian entities. In July 2013, the Company entered into an interest rate swap agreement for a notional amount of $175.0 million that is set to expire in July 2016. The notional amount of this swap mirrors the amortization of a $175.0 million portion of the Company’s $350.0 million term loan drawn from the Credit Facility. The swap requires the Company to make a monthly fixed rate payment of 0.87% calculated on the amortizing $175.0 million notional amount, and provides for the Company to receive a payment based upon a variable monthly LIBOR interest rate calculated on the same notional amount. The annualized borrowing rate of the swap at June 30, 2015 was approximately 2.23% . The receipt of the monthly LIBOR-based payment offsets a variable monthly LIBOR-based interest cost on a corresponding $175.0 million portion of the Company’s term loan from the Credit Facility. This interest rate swap is used to partially hedge the interest rate risk associated with the volatility of monthly LIBOR rate movement, and will be accounted for as a cash flow hedge. The following table provides a summary of the fair value amounts of our derivative instruments, all of which are Level 2 inputs as defined below (in thousands): Designation of Derivatives Balance Sheet Location June 30, December 31, Derivatives Designated as Hedging Instruments: Forward Currency Contracts Prepaid expenses and other current assets $ 674 $ 26 Total Assets $ 674 $ 26 Interest Rate Swaps Other non-current liabilities $ 737 $ 729 Total Liabilities $ 737 $ 729 Derivatives Not Designated as Hedging Instruments: Forward Currency Contracts Prepaid expenses and other current assets $ 87 $ 62 Total Assets $ 87 $ 62 Total Derivative Assets $ 761 $ 88 Total Derivative Liabilities 737 729 Total Net Derivative Asset (Liability) $ 24 $ (641 ) FASB ASC 820, Fair Value Measurements (“FASB ASC 820”), defines fair value, establishes a framework for measuring fair value and expands disclosure requirements about fair value measurements for interim and annual reporting periods. The guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1 – defined as quoted prices in active markets for identical instruments; Level 2 – defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3 – defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. In accordance with FASB ASC 820, the Company determined that the instruments summarized below are derived from significant observable inputs, referred to as Level 2 inputs. The following table represents assets and liabilities measured at fair value on a recurring basis and the basis for that measurement at June 30, 2015 and December 31, 2014 (in thousands): Total Fair Value at Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Forward Currency Contracts $ 761 $ — $ 761 $ — Total $ 761 $ — $ 761 $ — Liabilities: Interest Rate Swap $ 737 $ — $ 737 $ — Total $ 737 $ — $ 737 $ — Total Fair Value at Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Forward Currency Contracts $ 88 $ — $ 88 $ — Total $ 88 $ — $ 88 $ — Liabilities: Interest Rate Swap $ 729 $ — $ 729 $ — Total $ 729 $ — $ 729 $ — The following table summarizes the Company’s derivative positions at June 30, 2015 : Position Notional Amount Weighted Average Remaining Maturity In Years Average Exchange Rate Canadian Dollar/USD Sell $ 1,326,671 0.1 1.25 Singapore Dollar/USD Sell $ 2,453,418 1.3 1.11 Australian Dollar/USD Sell $ 2,519,436 0.5 0.76 USD/British Pound Sell £ 1,900,000 0.5 1.57 EURO/British Pound Sell £ 8,000,000 0.5 0.71 Interest Rate Swap $ 153,125,000 1.1 The Company had no transfers between Level 1, 2 or 3 inputs during the six months ended June 30, 2015 . Certain financial instruments are required to be recorded at fair value. Changes in assumptions or estimation methods could affect the fair value estimates; however, we do not believe any such changes would have a material impact on our financial condition, results of operations or cash flows. Other financial instruments including cash and cash equivalents and short-term borrowings, including notes payable, are recorded at cost, which approximates fair value, which are based on Level 2 inputs as previously defined.

Accounting Policies (Policies)

Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
Revenues	Revenues Revenues include construction, engineering and installation revenues that are recognized using the percentage-of-completion method of accounting in the ratio of costs incurred to estimated final costs. Revenues from change orders, extra work and variations in the scope of work are recognized when it is probable that they will result in additional contract revenue and when the amount can be reliably estimated. Contract costs include all direct material and labor costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools and equipment costs. The Company expenses all pre-contract costs in the period these costs are incurred. Since the financial reporting of these contracts depends on estimates, which are assessed continually during the term of these contracts, recognized revenues and profit are subject to revisions as the contract progresses to completion. Revisions in profit estimates are reflected in the period in which the facts that give rise to the revision become known. If material, the effects of any changes in estimates are disclosed in the notes to the consolidated financial statements. When estimates indicate that a loss will be incurred on a contract, a provision for the expected loss is recorded in the period in which the loss becomes evident. Any revenue recognized is only to the extent costs have been recognized in the period. Additionally, the Company expenses all costs for unpriced change orders in the period in which they are incurred. Revenues from the Company’s Energy Services segment are derived mainly from multiple engineering and construction type contracts, as well as maintenance contracts, under multi-year long-term master service agreements and alliance contracts. Businesses within the Company’s Energy Services segment enter into customer contracts that contain three principal types of pricing provisions: time and materials, cost plus fixed fee and fixed price. Although the terms of these contracts vary, most are made pursuant to cost reimbursable contracts on a time and materials basis under which revenues are recorded based on costs incurred at agreed upon contractual rates. These businesses also perform services on a cost plus fixed fee basis under which revenues are recorded based upon costs incurred at agreed upon rates and a proportionate amount of the fixed fee or percentage stipulated in the contract.
Foreign Currency Translation	Foreign Currency Translation For the Company’s international subsidiaries, the local currency is generally the functional currency. Assets and liabilities of these subsidiaries are translated into U.S. dollars using rates in effect at the balance sheet date while revenues and expenses are translated into U.S. dollars using average exchange rates. The cumulative translation adjustment resulting from changes in exchange rates are included in the Consolidated Balance Sheets as a component of accumulated other comprehensive income (loss) in total stockholders’ equity. Net foreign exchange transaction gains (losses) are included in other income (expense) in the Consolidated Statements of Operations. Due to the strengthening of the U.S. dollar, there was a substantial decrease with respect to certain functional currencies and their relation to the U.S. dollar during 2014 and the first six months of 2015, most notably the Canadian dollar, British pound and euro. The Company’s accumulated other comprehensive income is comprised of three main components: (i) currency translation; (ii) derivatives; and (iii) gains and losses associated with the Company’s defined benefit plan in the United Kingdom.
Taxation	Taxation The Company provides for estimated income taxes payable or refundable on current year income tax returns as well as the estimated future tax effects attributable to temporary differences and carryforwards, based upon enacted tax laws and tax rates, and in accordance with FASB ASC 740, Income Taxes (“FASB ASC 740”). FASB ASC 740 also requires that a valuation allowance be recorded against any deferred tax assets that are not likely to be realized in the future. Refer to Note 8 for additional information regarding taxes on income.
Long-Lived Assets	Long-Lived Assets Property, plant and equipment and other identified intangibles (primarily customer relationships, patents and acquired technologies, trademarks, licenses, contract backlog and non-compete agreements) are recorded at cost, net of accumulated depreciation and impairment, and, except for goodwill and certain trademarks, are depreciated or amortized on a straight-line basis over their estimated useful lives. Changes in circumstances such as technological advances, changes to the Company’s business model or changes in the Company’s capital strategy can result in the actual useful lives differing from the Company’s estimates. If the Company determines that the useful life of its property, plant and equipment or its identified intangible assets should be changed, the Company would depreciate or amortize the net book value in excess of the salvage value over its revised remaining useful life, thereby increasing or decreasing depreciation or amortization expense. Long-lived assets, including property, plant and equipment and other intangibles, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Such impairment tests are based on a comparison of undiscounted cash flows to the recorded value of the asset. The estimate of cash flow is based upon, among other things, assumptions about expected future operating performance. The Company’s estimates of undiscounted cash flow may differ from actual cash flow due to, among other things, technological changes, economic conditions, changes to its business model or changes in its operating performance. If the sum of the undiscounted cash flows (excluding interest) is less than the carrying value, the Company recognizes an impairment loss, measured as the amount by which the carrying value exceeds the fair value of the asset.
Goodwill	Goodwill Under FASB ASC 350, the Company assesses recoverability of goodwill on an annual basis or when events or changes in circumstances indicate that the carrying amount of goodwill may not be recoverable. An impairment charge will be recognized to the extent that the implied fair value of a reporting unit is less than its carrying value. Factors that could potentially trigger an impairment review include (but are not limited to): • significant underperformance of a reporting unit relative to expected, historical or forecasted operating results; • significant negative industry or economic trends; • significant changes in the strategy for a segment including extended slowdowns in the reporting unit’s market; • a decrease in market capitalization below the Company’s book value; and • a significant change in regulations. Whether during the annual impairment assessment or during a trigger-based impairment review, the Company determines the fair value of its reporting units and compares such fair value to the carrying value of those reporting units to determine if there are any indications of goodwill impairment. Fair value of reporting units is determined using a combination of two valuation methods: a market approach and an income approach with each method given equal weight in determining the fair value assigned to each reporting unit. Absent an indication of fair value from a potential buyer or similar specific transaction, the Company believes the use of these two methods provides a reasonable estimate of a reporting unit’s fair value. Assumptions common to both methods are operating plans and economic outlooks, which are used to forecast future revenues, earnings and after-tax cash flows for each reporting unit. These assumptions are applied consistently for both methods. The market approach estimates fair value by first determining earnings before interest, taxes, depreciation and amortization (“EBITDA”) multiples for comparable publicly-traded companies with similar characteristics of the reporting unit. The EBITDA multiples for comparable companies are based upon current enterprise value. The enterprise value is based upon current market capitalization and includes a control premium. The Company believes this approach is appropriate because it provides a fair value estimate using multiples from entities with operations and economic characteristics comparable to its reporting units. The income approach is based on forecasted future (debt-free) cash flows that are discounted to present value using factors that consider timing and risk of future cash flows. The Company believes this approach is appropriate because it provides a fair value estimate based upon the reporting unit’s expected long-term operating cash flow performance. Discounted cash flow projections are based on financial forecasts developed from operating plans and economic outlooks, growth rates, estimates of future expected changes in operating margins, terminal value growth rates, future capital expenditures and changes in working capital requirements. Estimates of discounted cash flows may differ from actual cash flows due to, among other things, changes in economic conditions, changes to business models, changes in the Company’s weighted average cost of capital, or changes in operating performance. The discount rate applied to the estimated future cash flows is one of the most significant assumptions utilized under the income approach. The Company determines the appropriate discount rate for each of its reporting units based on the weighted average cost of capital (“WACC”) for each individual reporting unit. The WACC takes into account both the pre-tax cost of debt and cost of equity (a major component of the cost of equity is the current risk-free rate on twenty year U.S. Treasury bonds). As each reporting unit has a different risk profile based on the nature of its operations, including market-based factors, the WACC for each reporting unit may differ. Accordingly, the WACCs are adjusted, as appropriate, to account for company-specific risks associated with each reporting unit.
Investments in Affiliated Companies	Investments in Affiliated Companies On March 31, 2014, the Company sold its forty-nine percent ( 49% ) interest in Bayou Coating to Stupp, the holder of the remaining fifty-one percent ( 51% ) interest in Bayou Coating. Stupp purchased the interest by exercising an existing option to acquire the Company’s interest in Bayou Coating at a purchase price equal to $9.1 million . During the first quarter of 2014, the difference between the Company’s recorded gross equity in earnings of affiliated companies of approximately $1.2 million and the final equity distribution settlement of $0.7 million resulted in a loss of approximately $0.5 million that is recorded in other income (expense) on the consolidated statement of operations. Prior to March 2014, the Company held a fifty-nine ( 59% ) equity interest in Bayou Delta through which the Company offers pipe jointing and other services for the steel-coated pipe industry. The remaining forty-one percent ( 41% ) was held by Bayou Coating. On March 31, 2014, the Company acquired this forty-one percent ( 41% ) interest from Bayou Coating by exercising its existing option at a purchase price equal to $0.6 million . Investments in entities in which the Company does not have control or is not the primary beneficiary of a variable interest entity, and for which the Company has 20% to 50% ownership or has the ability to exert significant influence, are accounted for by the equity method. At June 30, 2015 and December 31, 2014 , the investment in affiliated companies on the Company’s consolidated balance sheets was zero . Net income presented below for the six months ended June 30, 2014 includes Bayou Coating’s previously held forty-one percent ( 41% ) interest in Bayou Delta, which is eliminated for purposes of determining the Company’s equity in earnings of affiliated companies because Bayou Delta was consolidated in the Company’s financial statements as a result of its additional ownership through another Company subsidiary. The Company’s equity in earnings of affiliated companies for all periods presented below includes acquisition-related depreciation and amortization expense and is net of income taxes associated with these earnings.
Investments in Variable Interest Entities	Investments in Variable Interest Entities The Company evaluates all transactions and relationships with variable interest entities (“VIE”) to determine whether the Company is the primary beneficiary of the entities in accordance with FASB ASC 810, Consolidation. The Company’s overall methodology for evaluating transactions and relationships under the VIE requirements includes the following two steps: • determine whether the entity meets the criteria to qualify as a VIE; and • determine whether the Company is the primary beneficiary of the VIE. In performing the first step, the significant factors and judgments that the Company considers in making the determination as to whether an entity is a VIE include: • the design of the entity, including the nature of its risks and the purpose for which the entity was created, to determine the variability that the entity was designed to create and distribute to its interest holders; • the nature of the Company’s involvement with the entity; • whether control of the entity may be achieved through arrangements that do not involve voting equity; • whether there is sufficient equity investment at risk to finance the activities of the entity; and • whether parties other than the equity holders have the obligation to absorb expected losses or the right to receive residual returns. If the Company identifies a VIE based on the above considerations, it then performs the second step and evaluates whether it is the primary beneficiary of the VIE by considering the following significant factors and judgments: • whether the entity has the power to direct the activities of a variable interest entity that most significantly impact the entity’s economic performance; and • whether the entity has the obligation to absorb losses of the entity that could potentially be significant to the variable interest entity or the right to receive benefits from the entity that could potentially be significant to the variable interest entity.
Newly Issued Accounting Pronouncements	Newly Issued Accounting Pronouncements In April 2015, the FASB issued guidance that amends existing requirements regarding the balance sheet presentation of debt issuance costs as a deduction from the carrying amount of the related debt liability instead of a deferred charge. It is effective for annual reporting periods beginning after December 15, 2015, but early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s presentation of its financial condition. In August 2014, the FASB issued guidance that requires management to assess the Company’s ability to continue as a going concern and to provide related disclosures in certain circumstances. The standard is effective for public companies for annual periods beginning after December 15, 2016 and early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s presentation of its consolidated financial statements. In May 2014, the FASB issued guidance that supersedes revenue recognition requirements regarding contracts with customers to transfer goods or services or for the transfer of nonfinancial assets. Under the new guidance, entities are required to recognize revenue in order to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides a five-step analysis to be performed on transactions to determine when and how revenue is recognized. This new guidance is effective retroactively in fiscal years beginning after December 15, 2017. The Company is currently evaluating the effect the guidance will have on its financial condition and results of operations.

General (Tables)

General (Tables)	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business acquisition, pro forma information	The Schultz acquisition made the following contribution to the Company’s revenues and profits (in thousands): Quarter Ended June 30, 2015 Six Months Ended June 30, 2015 Revenues $ 3,970 $ 4,487 Net loss (19 ) (26 ) The following unaudited pro forma summary presents combined information of the Company as if the Schultz acquisition had occurred at the beginning of the year preceding its acquisition (in thousands): Quarter Ended June 30, 2014 Six Months Ended June 30, 2014 Revenues $ 325,326 $ 633,395 Net income (1) 12,695 17,128 _____________________ (1) Includes pro-forma adjustments for purchase price depreciation and amortization as if those intangibles were recorded at the beginning of the year preceding the acquisition date.
Schedule of fair value of assets acquired and liabilities assumed	The following table summarizes the fair value of identified assets and liabilities of the Schultz acquisition at its acquisition date (in thousands): Receivables and cost and estimated earnings in excess of billings $ 1,100 Prepaid expenses and other current assets 19 Property, plant and equipment 162 Identified intangible assets 3,060 Accounts payable, accrued expenses and billings in excess of cost and estimated earnings (461 ) Total identifiable net assets $ 3,880 Total consideration recorded $ 7,878 Less: total identifiable net assets 3,880 Goodwill at June 30, 2015 $ 3,998

Accounting Policies (Tables)

Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
Financial data for the investment in affiliated companies	Financial data for the investment in affiliated companies for the six months ended June 30, 2014 is summarized in the following table (in thousands): Six Months Ended Income statement data (1) June 30, 2014 Revenue $ 9,088 Gross profit 3,489 Net income 2,413 Equity in earnings of affiliated companies 677 __________________________ (1) Includes the results of Bayou Coating through the date of its sale, March 31, 2014.
Financial data for consolidated variable interest entities	Financial data for consolidated variable interest entities are summarized in the following table (in thousands): Balance sheet data June 30, December 31, Current assets $ 52,709 $ 57,046 Non-current assets 41,125 43,165 Current liabilities 19,563 22,525 Non-current liabilities 35,236 36,155 Six Months Ended June 30, Income statement data 2015 2014 Revenue $ 18,295 $ 35,482 Gross profit 1,475 4,475 Net loss (767 ) (341 )

Restructuring (Tables)

Restructuring (Tables)	6 Months Ended
	Jun. 30, 2015
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs	During the quarter and six-month period ended June 30, 2015, the Company recorded pre-tax expense related to the 2014 Restructuring as follows (in thousands): Quarter Ended June 30, 2015 Six Months Ended June 30, 2015 Severance and benefit related costs $ 178 $ 694 Lease termination costs 26 168 Allowances for doubtful accounts 2,290 1,291 Currency translation 411 820 Other restructuring costs (1) 2,789 6,259 Total pre-tax restructuring charges (2) $ 5,694 $ 9,232 __________________________ (1) Includes charges related to the write-off of certain other assets, including the loss on the CIPP contracting operation in France, professional fees and certain other restructuring charges. (2) All charges for the quarter and six-month period ended June 30, 2015 relate to the Infrastructure Solutions reportable segment. The following tables summarize all restructuring charges recognized in the quarter and six-month period ended June 30, 2015 as presented in their affected line in the Consolidated Statements of Operations (in thousands): Quarter Ended June 30, 2015 Six Months Ended June 30, 2015 Other Non-Cash Restructuring Charges Cash Restructuring Charges (Reversals) (1) Total Other Cash (1) Total Cost of revenues $ 35 $ 933 $ 968 $ (132 ) $ 1,114 $ 982 Operating expenses 2,290 2,210 4,500 1,270 3,362 4,632 Restructuring charges — 204 204 — 862 862 Other expense 246 (224 ) 22 2,938 (182 ) 2,756 Total pre-tax restructuring charges (2) $ 2,571 $ 3,123 $ 5,694 $ 4,076 $ 5,156 $ 9,232 __________________________ (1) Cash charges consist of charges incurred during the period that will be settled in cash, either during the current period or future periods. (2) All charges for the quarter and six-month period ended June 30, 2015 relate to the Infrastructure Solutions reportable segment.
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the 2014 Restructuring activity during the first six months of 2015 (in thousands): Utilized Reserves at December 31, 2014 Charge to Income Foreign Currency Translation Cash (1) Non-Cash Reserves at June 30, 2015 Severance and benefit related costs $ 466 $ 694 $ (3 ) $ 975 $ — $ 182 Lease termination expenses — 168 (2 ) 166 — — Allowances for doubtful accounts 11,464 1,291 (72 ) — 2,785 9,898 Currency translation — 820 — — 820 — Other restructuring costs 2,496 6,259 (70 ) 3,541 2,032 3,112 Total pre-tax restructuring charges $ 14,426 $ 9,232 $ (147 ) $ 4,682 $ 5,637 $ 13,192

Share Information (Tables)

Share Information (Tables)	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	Earnings per share have been calculated using the following share information: Quarters Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Weighted average number of common shares used for basic EPS 36,468,374 37,893,170 36,886,777 37,928,548 Effect of dilutive stock options and restricted and deferred stock unit awards 314,797 357,028 266,394 378,099 Weighted average number of common shares and dilutive potential common stock used in dilutive EPS 36,783,171 38,250,198 37,153,171 38,306,647

Goodwill and Identified Intan26

Goodwill and Identified Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill (in thousands) Infrastructure Corrosion Energy Total Beginning balance at January 1, 2015 $ 177,275 $ 39,500 $ 76,248 $ 293,023 Additions to goodwill through acquisitions (1) — — 3,998 3,998 Foreign currency translation (1,800 ) (729 ) — (2,529 ) Balance at June 30, 2015 $ 175,475 $ 38,771 $ 80,246 $ 294,492 __________________________ (1) During the first and second quarters of 2015, the Company recorded goodwill of $3.6 million and $0.4 million , respectively, related to the acquisition of Schultz Mechanical Contractors, Inc. (see Note 1).
Schedule of Finite-Lived Intangible Assets	Identified Intangible Assets (in thousands) June 30, 2015 December 31, 2014 Weighted Average Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount License agreements 5 $ 3,902 $ (3,203 ) $ 699 $ 3,908 $ (3,131 ) $ 777 Backlog 0 4,720 (4,720 ) — 4,731 (4,731 ) — Leases 12 2,067 (692 ) 1,375 2,067 (623 ) 1,444 Trademarks (1) 15 22,509 (5,728 ) 16,781 21,722 (5,199 ) 16,523 Non-competes (1) 3 1,210 (890 ) 320 1,140 (839 ) 301 Customer relationships (1) 13 165,288 (37,015 ) 128,273 163,386 (32,196 ) 131,190 Patents and acquired technology 15 55,579 (22,545 ) 33,034 54,090 (22,052 ) 32,038 $ 255,275 $ (74,793 ) $ 180,482 $ 251,044 $ (68,771 ) $ 182,273 __________________________ (1) During the first quarter of 2015, the Company recorded customer relationships, trademarks and non-competes of $2.3 million , $0.7 million and $0.1 million , respectively, related to the acquisition of Schultz Mechanical Contractors, Inc. (see Note 1).
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated amortization expense by year is as follows (in thousands): 2015 $ 13,002 2016 13,239 2017 13,244 2018 13,076 2019 12,933

Stockholders' Equity and Equi27

Stockholders' Equity and Equity Compensation (Tables)	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
Summary of all stock award activity	The following table summarizes all stock award activity during the six months ended June 30, 2015 : Stock Awards Weighted Average Award Date Fair Value Outstanding at January 1, 2015 767,540 $ 21.93 Restricted shares awarded — — Restricted stock units awarded 691,781 17.25 Restricted shares distributed (87,600 ) 19.07 Restricted stock units distributed (10,856 ) 19.17 Restricted shares forfeited (45,207 ) 23.64 Restricted stock units forfeited (27,950 ) 20.06 Outstanding at June 30, 2015 1,287,708 $ 19.62
Summary of all deferred stock unit activity	The following table summarizes all deferred stock unit activity during the six months ended June 30, 2015 : Deferred Stock Units Weighted Average Award Date Fair Value Outstanding at January 1, 2015 221,471 $ 20.10 Awarded 51,199 18.61 Distributed (12,819 ) 19.89 Outstanding at June 30, 2015 259,851 $ 19.81
Summary of stock option activity	The following table summarizes all stock option activity during the six months ended June 30, 2015 : Shares Weighted Average Exercise Price Outstanding at January 1, 2015 503,134 $ 18.18 Granted — — Exercised (100,191 ) 12.97 Canceled/Expired (5,546 ) 24.21 Outstanding at June 30, 2015 397,397 $ 19.41 Exercisable at June 30, 2015 392,338 $ 19.44
Financial data for stock option exercises	Financial data for stock option exercises are summarized in the following table (in thousands): Six Months Ended June 30, 2015 2014 Amount collected from stock option exercises $ 1,299 $ 7,645 Total intrinsic value of stock option exercises 273 3,088 Tax shortfall (benefit) of stock option exercises recorded in additional paid-in-capital 100 (459 ) Aggregate intrinsic value of outstanding stock options 744 3,452 Aggregate intrinsic value of exercisable stock options 738 3,113
Summary of valuation assumptions	The fair value of stock options awarded during the six-month period ended June 30, 2014 was estimated at the date of grant based on the assumptions presented in the table below: Six Months Ended June 30, 2014 Grant-date fair value $11.27 Volatility 41.6% Expected term (years) 7.0 Dividend yield —% Risk-free rate 2.3%

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Financial Information by Segment	Financial information by segment was as follows (in thousands): Quarters Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Revenues: Infrastructure Solutions $ 149,091 $ 147,260 $ 271,564 $ 269,584 Corrosion Protection 106,022 102,923 207,765 210,931 Energy Services 81,983 72,685 166,933 148,587 Total revenues $ 337,096 $ 322,868 $ 646,262 $ 629,102 Gross profit: Infrastructure Solutions (1) $ 39,031 $ 35,951 $ 67,646 $ 61,505 Corrosion Protection 21,887 25,034 42,716 49,175 Energy Services 11,135 10,933 20,881 22,301 Total gross profit $ 72,053 $ 71,918 $ 131,243 $ 132,981 Operating income: Infrastructure Solutions (2) $ 12,115 $ 12,876 $ 19,447 $ 14,334 Corrosion Protection 936 5,277 1,436 8,968 Energy Services 1,472 2,466 2,765 6,451 Total operating income $ 14,523 $ 20,619 $ 23,648 $ 29,753 _______________________ (1) Includes charges of $1.0 million and $1.1 million in the quarter and six months ended June 30, 2015, respectively, related to the 2014 Restructuring (see Note 3). (2) Includes charges of $5.7 million and $6.5 million in the quarter and six months ended June 30, 2015, respectively, related to the 2014 Restructuring (see Note 3).
Summary of Revenues, Gross Profit, and Operating Income by Geographic Region	The following table summarizes revenues, gross profit and operating income by geographic region (in thousands): Quarters Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Revenues (1) : United States $ 252,834 $ 227,618 $ 475,975 $ 438,248 Canada 39,400 42,212 86,052 84,075 Europe 13,646 21,175 27,763 43,791 Other foreign 31,216 31,863 56,472 62,988 Total revenues $ 337,096 $ 322,868 $ 646,262 $ 629,102 Gross profit: United States $ 54,639 $ 50,891 $ 92,493 $ 92,284 Canada 8,491 9,934 20,680 18,996 Europe 3,835 4,543 8,060 9,301 Other foreign 5,088 6,550 10,010 12,400 Total gross profit $ 72,053 $ 71,918 $ 131,243 $ 132,981 Operating income (loss): United States $ 10,644 $ 11,693 $ 7,724 $ 14,089 Canada 4,836 6,129 13,442 11,552 Europe 469 851 1,940 1,378 Other foreign (1,426 ) 1,946 542 2,734 Total operating income $ 14,523 $ 20,619 $ 23,648 $ 29,753 __________________________ (1) Revenues are attributed to the country of origin for the Company’s legal entities. For a significant majority of its legal entities, the country of origin relates to the country or geographic area that it services.

Derivative Financial Instrume29

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of fair value amounts of derivative instruments	The following table provides a summary of the fair value amounts of our derivative instruments, all of which are Level 2 inputs as defined below (in thousands): Designation of Derivatives Balance Sheet Location June 30, December 31, Derivatives Designated as Hedging Instruments: Forward Currency Contracts Prepaid expenses and other current assets $ 674 $ 26 Total Assets $ 674 $ 26 Interest Rate Swaps Other non-current liabilities $ 737 $ 729 Total Liabilities $ 737 $ 729 Derivatives Not Designated as Hedging Instruments: Forward Currency Contracts Prepaid expenses and other current assets $ 87 $ 62 Total Assets $ 87 $ 62 Total Derivative Assets $ 761 $ 88 Total Derivative Liabilities 737 729 Total Net Derivative Asset (Liability) $ 24 $ (641 )
Schedule of assets and liabilities measured at fair value on a recurring basis	The following table represents assets and liabilities measured at fair value on a recurring basis and the basis for that measurement at June 30, 2015 and December 31, 2014 (in thousands): Total Fair Value at Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Forward Currency Contracts $ 761 $ — $ 761 $ — Total $ 761 $ — $ 761 $ — Liabilities: Interest Rate Swap $ 737 $ — $ 737 $ — Total $ 737 $ — $ 737 $ — Total Fair Value at Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Forward Currency Contracts $ 88 $ — $ 88 $ — Total $ 88 $ — $ 88 $ — Liabilities: Interest Rate Swap $ 729 $ — $ 729 $ — Total $ 729 $ — $ 729 $ —
Summary of derivative positions	The following table summarizes the Company’s derivative positions at June 30, 2015 : Position Notional Amount Weighted Average Remaining Maturity In Years Average Exchange Rate Canadian Dollar/USD Sell $ 1,326,671 0.1 1.25 Singapore Dollar/USD Sell $ 2,453,418 1.3 1.11 Australian Dollar/USD Sell $ 2,519,436 0.5 0.76 USD/British Pound Sell £ 1,900,000 0.5 1.57 EURO/British Pound Sell £ 8,000,000 0.5 0.71 Interest Rate Swap $ 153,125,000 1.1

General (Details)

General (Details) $ in Thousands

Mar. 01, 2015USD ($)

Mar. 31, 2014USD ($)

Jul. 31, 2015USD ($)

Feb. 28, 2015

Dec. 31, 2014

Jun. 30, 2015USD ($)

Jun. 30, 2014USD ($)

Mar. 31, 2014USD ($)

Jun. 30, 2015USD ($)

Jun. 30, 2014USD ($)

Dec. 31, 2014plant

Feb. 28, 2014

Dec. 31, 2013

General [Line Items]

Proceeds from sale of interests in Bayou Coating, L.L.C.

$ 0

$ 9,065

Equity in earnings of affiliated companies

$ 0

$ 0

0

677

Proceeds from equity method investment

0

684

Loss on sale of interests in Bayou Coating, L.L.C.

0

472

Payments to purchase noncontrolling interest

$ 0

$ 617

Restructuring Plan 2014 [Member]

General [Line Items]

Number of plant closures | plant

2

Restructuring Plan 2014 [Member] | Minimum [Member]

General [Line Items]

Period of capital investments in the remaining coating facilities

2 years

Restructuring Plan 2014 [Member] | Maximum [Member]

General [Line Items]

Period of capital investments in the remaining coating facilities

3 years

CRTS [Member] | Subsequent Event [Member]

General [Line Items]

Contingent consideration payment

$ 700

Proceeds from settlement of escrow claims

1,000

CRTS [Member] | Subsequent Event [Member] | Operating Expense [Member]

General [Line Items]

Proceeds from settlement of escrow claims

200

CRTS [Member] | Subsequent Event [Member] | Other Income (Expense) [Member]

General [Line Items]

Proceeds from settlement of escrow claims

$ 800

Schultz Mechanical Contractors, Inc. [Member]

General [Line Items]

Total consideration recorded

$ 7,878

Cash payments to acquire business

6,900

Purchase price

7,100

Working capital adjustment

200

Adjustment to account for deferred consideration

$ 1,000

Ka-te [Member]

General [Line Items]

Period of trademark license

5 years

Video Injection - Instituform SAS [Member]

General [Line Items]

Period of trademark license

5 years

Bayou Coating [Member]

General [Line Items]

Percent of book value

49.00%

49.00%

49.00%

Percent interest by noncontrolling owners

51.00%

51.00%

Proceeds from sale of interests in Bayou Coating, L.L.C.

$ 9,100

Equity in earnings of affiliated companies

$ 1,200

Proceeds from equity method investment

$ 700

Delta Double Jointing [Member]

General [Line Items]

Percent interest by noncontrolling owners

41.00%

Percent ownership interest by parent

59.00%

Payments to purchase noncontrolling interest

$ 600

Insituform Linings Ltd. [Member] | Ka-te [Member]

General [Line Items]

Term of exclusive tube supply agreement

5 years

Insituform Linings Ltd. [Member] | Video Injection - Instituform SAS [Member]

General [Line Items]

Term of exclusive tube supply agreement

5 years

General - Contributions to Reve

General - Contributions to Revenues and Profits Since Acquisitions (Details) - Jun. 30, 2015 - Schultz Mechanical Contractors, Inc. [Member] - USD ($) $ in Thousands	Total	Total
Business Acquisition [Line Items]
Revenues	$ 3,970	$ 4,487
Net loss	$ (19)	$ (26)

General - Pro Forma Information

General - Pro Forma Information (Details) - Jun. 30, 2014 - Schultz Mechanical Contractors, Inc. [Member] - USD ($) $ in Thousands	Total	Total
Business Acquisition [Line Items]
Revenues	$ 325,326	$ 633,395
Net income	$ 12,695	$ 17,128

General - Fair Value of Identif

General - Fair Value of Identified Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 01, 2015	Jun. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill at June 30, 2015		$ 294,492	$ 293,023
Schultz Mechanical Contractors, Inc. [Member]
Business Acquisition [Line Items]
Receivables and cost and estimated earnings in excess of billings	$ 1,100
Prepaid expenses and other current assets	19
Property, plant and equipment	162
Identified intangible assets	3,060
Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	(461)
Total identifiable net assets	3,880
Total consideration recorded	7,878
Less: total identifiable net assets	$ 3,880
Goodwill at June 30, 2015		$ 3,998

Accounting Policies (Details)

Accounting Policies (Details) - USD ($)	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Feb. 28, 2014	Dec. 31, 2013
Accounting Policies [Line Items]
Accumulated income (loss) related to currency translation adjustments		$ (41,900,000)	$ 2,500,000		$ (41,900,000)	$ 2,500,000
Accumulated income (loss) related to derivative transactions		(100,000)	(800,000)		(100,000)	(800,000)
Accumulated income (loss) related to pension activity		500,000	(200,000)		500,000	(200,000)
Proceeds from sale of interests in Bayou Coating, L.L.C.					0	9,065,000
Equity in earnings of affiliated companies		0	$ 0		0	677,000
Proceeds from equity method investment					0	684,000
Loss on sale of interests in Bayou Coating, L.L.C.					0	472,000
Payments to purchase noncontrolling interest					0	$ 617,000
Investment in affiliated companies		$ 0			$ 0		$ 0
Bayou Coating [Member]
Accounting Policies [Line Items]
Percent of book value	49.00%			49.00%					49.00%
Percent interest by noncontrolling owners	51.00%			51.00%
Proceeds from sale of interests in Bayou Coating, L.L.C.	$ 9,100,000
Equity in earnings of affiliated companies				$ 1,200,000
Proceeds from equity method investment				$ 700,000
Delta Double Jointing [Member]
Accounting Policies [Line Items]
Percent interest by noncontrolling owners								41.00%
Percent ownership interest by parent								59.00%
Payments to purchase noncontrolling interest	$ 600,000

Accounting Policies - Financial

Accounting Policies - Financial Data for Investments in Affiliated Companies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accounting Policies [Abstract]
Revenue				$ 9,088
Gross profit				3,489
Net income				2,413
Equity in earnings of affiliated companies	$ 0	$ 0	$ 0	$ 677

Accounting Policies - Financi36

Accounting Policies - Financial Data for Variable Interest Entities - Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Current assets	$ 52,709	$ 57,046
Non-current assets	41,125	43,165
Current liabilities	19,563	22,525
Non-current liabilities	$ 35,236	$ 36,155

Accounting Policies - Financi37

Accounting Policies - Financial Data for Variable Interest Entities - Income Statement (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Accounting Policies [Abstract]
Revenue	$ 18,295	$ 35,482
Gross profit	1,475	4,475
Net loss	$ (767)	$ (341)

Restructuring (Details)

Restructuring (Details) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Feb. 28, 2015	Dec. 31, 2014	Jun. 30, 2015USD ($)position	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)position	Jun. 30, 2014USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 204	$ 0	$ 862	$ 0
Ka-te [Member]
Restructuring Cost and Reserve [Line Items]
Period of trademark license		5 years
Video Injection - Instituform SAS [Member]
Restructuring Cost and Reserve [Line Items]
Period of trademark license	5 years
Insituform Linings Ltd. [Member] | Ka-te [Member]
Restructuring Cost and Reserve [Line Items]
Term of exclusive tube supply agreement		5 years
Insituform Linings Ltd. [Member] | Video Injection - Instituform SAS [Member]
Restructuring Cost and Reserve [Line Items]
Term of exclusive tube supply agreement	5 years
Restructuring Plan 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Number of terminations since inception of restructuring plan | position			85		85
Number of terminations during period | position					54
Restructuring charges					$ 9,232
Total pre-tax restructuring charges to date			$ 58,700		58,700
Total restructuring charges to date, net of tax			43,800		43,800
Estimated remaining restructuring costs to be incurred in 2015			2,000		2,000
Restructuring Plan 2014 [Member] | Non-cash restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Total pre-tax restructuring charges to date			47,900		47,900
Restructuring Plan 2014 [Member] | Non-cash restructuring [Member] | Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Total pre-tax restructuring charges to date			22,200		22,200
Restructuring Plan 2014 [Member] | Non-cash restructuring [Member] | Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Total pre-tax restructuring charges to date			25,700		25,700
Restructuring Plan 2014 [Member] | Cash restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Total pre-tax restructuring charges to date			$ 10,800		10,800
Restructuring Plan 2014 [Member] | Severance and benefit costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					694
Restructuring Plan 2014 [Member] | Other restructuring costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 6,259

Restructuring - Restructuring C

Restructuring - Restructuring Costs by Segment (Details) - Jun. 30, 2015 - Restructuring Plan 2014 [Member] - Infrastructure Solutions [Member] - USD ($) $ in Thousands	Total	Total
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	$ 5,694	$ 9,232
Severance and benefit costs [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	178	694
Lease termination costs [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	26	168
Allowance for doubtful accounts [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	2,290	1,291
Currency translation [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	411	820
Other restructuring costs [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	$ 2,789	$ 6,259

Restructuring - Restructuring R

Restructuring - Restructuring Reserve by Type of Cost (Details) - Jun. 30, 2015 - Restructuring Plan 2014 [Member] - Infrastructure Solutions [Member] - USD ($) $ in Thousands	Total	Total
Restructuring Cost and Reserve [Line Items]
Other non-cash restructuring charges (reversals)	$ 2,571	$ 4,076
Cash restructuring charges	3,123	5,156
Pre-tax charges related to restructuring	5,694	9,232
Cost of revenues [Member]
Restructuring Cost and Reserve [Line Items]
Other non-cash restructuring charges (reversals)	35	(132)
Cash restructuring charges	933	1,114
Pre-tax charges related to restructuring	968	982
Operating expenses [Member]
Restructuring Cost and Reserve [Line Items]
Other non-cash restructuring charges (reversals)	2,290	1,270
Cash restructuring charges	2,210	3,362
Pre-tax charges related to restructuring	4,500	4,632
Restructuring charges [Member]
Restructuring Cost and Reserve [Line Items]
Other non-cash restructuring charges (reversals)	0	0
Cash restructuring charges	204	862
Pre-tax charges related to restructuring	204	862
Other expense [Member]
Restructuring Cost and Reserve [Line Items]
Other non-cash restructuring charges (reversals)	246	2,938
Cash restructuring charges	(224)	(182)
Pre-tax charges related to restructuring	$ 22	$ 2,756

Restructuring - Restructuring P

Restructuring - Restructuring Plan Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restructuring Reserve [Roll Forward]
Charge (reversal) to income	$ 204	$ 0	$ 862	$ 0
Restructuring Plan 2014 [Member]
Restructuring Reserve [Roll Forward]
Reserves at December 31, 2014			14,426
Charge (reversal) to income			9,232
Foreign currency translation			(147)
Utilized - Cash			4,682
Utilized - Non-Cash			5,637
Reserves at June 30, 2015	13,192		13,192
Restructuring Plan 2014 [Member] | Severance and benefit costs [Member]
Restructuring Reserve [Roll Forward]
Reserves at December 31, 2014			466
Charge (reversal) to income			694
Foreign currency translation			(3)
Utilized - Cash			975
Utilized - Non-Cash			0
Reserves at June 30, 2015	182		182
Restructuring Plan 2014 [Member] | Lease termination costs [Member]
Restructuring Reserve [Roll Forward]
Reserves at December 31, 2014			0
Charge (reversal) to income			168
Foreign currency translation			(2)
Utilized - Cash			166
Utilized - Non-Cash			0
Reserves at June 30, 2015	0		0
Restructuring Plan 2014 [Member] | Allowance for doubtful accounts [Member]
Restructuring Reserve [Roll Forward]
Reserves at December 31, 2014			11,464
Charge (reversal) to income			1,291
Foreign currency translation			(72)
Utilized - Cash			0
Utilized - Non-Cash			2,785
Reserves at June 30, 2015	9,898		9,898
Restructuring Plan 2014 [Member] | Currency translation [Member]
Restructuring Reserve [Roll Forward]
Reserves at December 31, 2014			0
Charge (reversal) to income			820
Foreign currency translation			0
Utilized - Cash			0
Utilized - Non-Cash			820
Reserves at June 30, 2015	0		0
Restructuring Plan 2014 [Member] | Other restructuring costs [Member]
Restructuring Reserve [Roll Forward]
Reserves at December 31, 2014			2,496
Charge (reversal) to income			6,259
Foreign currency translation			(70)
Utilized - Cash			3,541
Utilized - Non-Cash			2,032
Reserves at June 30, 2015	$ 3,112		$ 3,112

Share Information (Details)

Share Information (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of earnings per share	164,014	200,725	286,251	200,725

Share Information - Earnings Pe

Share Information - Earnings Per Share Calculation, Share Information (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Weighted average number of common shares used for basic EPS	36,468,374	37,893,170	36,886,777	37,928,548
Effect of dilutive stock options and restricted and deferred stock unit awards	314,797	357,028	266,394	378,099
Weighted average number of common shares and dilutive potential common stock used in dilutive EPS	36,783,171	38,250,198	37,153,171	38,306,647

Goodwill and Identified Intan44

Goodwill and Identified Intangible Assets Goodwill and Identified Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Additions to goodwill through acquisitions				$ 3,998
Amortization of Intangible Assets	$ 3,200		$ 3,600	$ 6,400	$ 7,000
Schultz Mechanical Contractors, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Additions to goodwill through acquisitions	$ 400	$ 3,600
Schultz Mechanical Contractors, Inc. [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired through acquisition		2,300
Schultz Mechanical Contractors, Inc. [Member] | Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired through acquisition		700
Schultz Mechanical Contractors, Inc. [Member] | Non-competes [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired through acquisition		$ 100

Goodwill and Identified Intan45

Goodwill and Identified Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 293,023
Additions to goodwill through acquisitions	3,998
Foreign currency translation	(2,529)
Goodwill, ending balance	294,492
Infrastructure Solutions [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	177,275
Additions to goodwill through acquisitions	0
Foreign currency translation	(1,800)
Goodwill, ending balance	175,475
Corrosion Protection [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	39,500
Additions to goodwill through acquisitions	0
Foreign currency translation	(729)
Goodwill, ending balance	38,771
Energy Services [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	76,248
Additions to goodwill through acquisitions	3,998
Foreign currency translation	0
Goodwill, ending balance	$ 80,246

Goodwill and Identified Intan46

Goodwill and Identified Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 255,275	$ 251,044
Accumulated Amortization	(74,793)	(68,771)
Net Carrying Amount	$ 180,482	182,273
License Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	5 years
Gross Carrying Amount	$ 3,902	3,908
Accumulated Amortization	(3,203)	(3,131)
Net Carrying Amount	$ 699	777
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives
Gross Carrying Amount	$ 4,720	4,731
Accumulated Amortization	(4,720)	(4,731)
Net Carrying Amount	$ 0	0
Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	12 years
Gross Carrying Amount	$ 2,067	2,067
Accumulated Amortization	(692)	(623)
Net Carrying Amount	$ 1,375	1,444
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	15 years
Gross Carrying Amount	$ 22,509	21,722
Accumulated Amortization	(5,728)	(5,199)
Net Carrying Amount	$ 16,781	16,523
Non-competes [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	3 years
Gross Carrying Amount	$ 1,210	1,140
Accumulated Amortization	(890)	(839)
Net Carrying Amount	$ 320	301
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	13 years
Gross Carrying Amount	$ 165,288	163,386
Accumulated Amortization	(37,015)	(32,196)
Net Carrying Amount	$ 128,273	131,190
Patents and acquired technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	15 years
Gross Carrying Amount	$ 55,579	54,090
Accumulated Amortization	(22,545)	(22,052)
Net Carrying Amount	$ 33,034	$ 32,038

Goodwill and Identified Intan47

Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense (Details) $ in Thousands	Jun. 30, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,015	$ 13,002
2,016	13,239
2,017	13,244
2,018	13,076
2,019	$ 12,933

Long-Term Debt and Credit Fac48

Long-Term Debt and Credit Facility (Details)	Mar. 31, 2015USD ($)	Jul. 01, 2013USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)	Jul. 31, 2013USD ($)
Debt Instrument [Line Items]
Amount retired under prior credit facility		$ 232,300,000
Amount of cash on hand to fund transactions		7,000,000
Actual financial leverage ratio			2.96
Proceeds from line of credit			$ 26,000,000	$ 0
Other Long-term Debt			11,800,000		$ 12,400,000
Other Loans Payable			100,000		100,000
Letters of credit issued and outstanding			27,000,000
Long-term debt, fair value			$ 363,200,000		377,000,000
Initial maximum financial leverage ratio			3.25
Remaining borrowing capacity			$ 35,100,000
Minimum permitted fixed charge coverage ratio			1.25
Actual fixed charge coverage ratio			1.31
Insurance Carriers Collateral [Member]
Debt Instrument [Line Items]
Letters of credit issued and outstanding			$ 10,200,000
Work Performance Obligations [Member]
Debt Instrument [Line Items]
Letters of credit issued and outstanding			$ 16,800,000
2013 Interest Rate Swap [Member]
Debt Instrument [Line Items]
Notional Amount						$ 175,000,000
Fixed interest rate						0.87%
Annualized borrowing rate			2.23%
Brinderson LP [Member]
Debt Instrument [Line Items]
Total consideration recorded		147,600,000
2013 Credit Facility [Member]
Debt Instrument [Line Items]
Face amount of debt						$ 650,000,000
Maximum borrowing capacity						300,000,000
Term of credit facility			5 years
Secured Debt			$ 279,800,000		319,400,000	350,000,000
Term of debt instrument			5 years
Amount drawn on credit facility		$ 35,500,000	$ 71,500,000		$ 45,500,000
Annual mandatory prepayment, percent of Excess Cash Flow			50.00%
Minimum Consolidated Leverage Ratio required			2.50
Actual financial leverage ratio					2.90
Term loan repayment	$ 26,500,000
Proceeds from line of credit	$ 26,000,000
Derivative, Amount of Hedged Item						$ 175,000,000
2013 Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest rate at period end			2.14%
2013 Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.25%
2013 Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.25%

Stockholders' Equity and Equi49

Stockholders' Equity and Equity Compensation (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015USD ($)plan$ / sharesshares	Jun. 30, 2014USD ($)$ / shares	Jun. 30, 2015USD ($)plan$ / sharesshares	Jun. 30, 2014USD ($)$ / shares	Feb. 28, 2015USD ($)
Stockholders' Equity and Equity Compensation (Details) [Line Items]
Number of equity based compensation plans | plan	2		2
Closing stock price (in dollars per share) | $ / shares	$ 18.94	$ 23.27	$ 18.94	$ 23.27
Stock Options [Member]
Stockholders' Equity and Equity Compensation (Details) [Line Items]
Stock repurchased during period, shares | shares			88,834
Stock repurchased during period, value			$ 1,400,000
Stock repurchased during period, net cash value			100,000
Share based compensation expense	$ 0	$ 100,000	$ 100,000	$ 500,000
Weighted average recognition period			1 year 1 month 1 day
Stock Options [Member] | Minimum [Member]
Stockholders' Equity and Equity Compensation (Details) [Line Items]
Award vesting period			7 years
Stock Options [Member] | Maximum [Member]
Stockholders' Equity and Equity Compensation (Details) [Line Items]
Award vesting period			10 years
Stock Awards [Member]
Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share based compensation expense	2,000,000	$ 1,000,000	$ 3,500,000	1,900,000
Unrecognized share based compensation expense	$ 18,200,000		$ 18,200,000
Weighted average recognition period			2 years 3 months
Deferred Stock Units [Member]
Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share based compensation expense			$ 900,000	$ 800,000
2013 Employee Plan [Member]
Stockholders' Equity and Equity Compensation (Details) [Line Items]
Number of shares of common stock reserved for issuance | shares	2,895,000		2,895,000
Number of shares available for issuance | shares	1,019,009		1,019,009
2011 Director Plan [Member]
Stockholders' Equity and Equity Compensation (Details) [Line Items]
Number of shares of common stock reserved for issuance | shares	250,000		250,000
Number of shares available for issuance | shares	72,654		72,654
Open Market Repurchase Program [Member]
Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share repurchase program, authorized amount					$ 20,000,000
Stock repurchased during period, shares | shares			1,091,122
Stock repurchased during period, value			$ 20,000,000
Shares repurchased, average price per share (in Dollars per share) | $ / shares			$ 18.33
Equity Compensation Programs [Member]
Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share repurchase program, authorized amount	$ 10,000,000		$ 10,000,000
Stock repurchased during period, shares | shares			31,377
Stock repurchased during period, value			$ 500,000
Shares repurchased, average price per share (in Dollars per share) | $ / shares			$ 16.96

Stockholders' Equity and Equi50

Stockholders' Equity and Equity Compensation - Summary of Stock Award Activity (Details) - 6 months ended Jun. 30, 2015 - $ / shares	Total
Stock Awards [Member]
Number of Awards
Outstanding at January 1, 2015	767,540
Outstanding at June 30, 2015	1,287,708
Weighted Average Award Date Fair Value (in dollars per share)
Outstanding at January 1, 2015 (in Dollars per share)	$ 21.93
Outstanding at June 30, 2015 (in Dollars per share)	$ 19.62
Restricted Shares [Member]
Number of Awards
Awarded	0
Distributed	(87,600)
Forfeited	(45,207)
Weighted Average Award Date Fair Value (in dollars per share)
Awarded (in Dollars per share)	$ 0
Distributed (in Dollars per share)	19.07
Forfeited (in Dollars per share)	$ 23.64
Restricted Stock Units [Member]
Number of Awards
Awarded	691,781
Distributed	(10,856)
Forfeited	(27,950)
Weighted Average Award Date Fair Value (in dollars per share)
Awarded (in Dollars per share)	$ 17.25
Distributed (in Dollars per share)	19.17
Forfeited (in Dollars per share)	$ 20.06

Stockholders' Equity and Equi51

Stockholders' Equity and Equity Compensation - Summary of Deferred Stock Unit Activity (Details) - 6 months ended Jun. 30, 2015 - Deferred Stock Units [Member] - $ / shares	Total
Number of Awards
Outstanding at January 1, 2015	221,471
Awarded	51,199
Distributed	(12,819)
Outstanding at June 30, 2015	259,851
Weighted Average Award Date Fair Value (in dollars per share)
Outstanding at January 1, 2015 (in Dollars per share)	$ 20.10
Awarded (in Dollars per share)	18.61
Distributed (in Dollars per share)	19.89
Outstanding at June 30, 2015 (in Dollars per share)	$ 19.81

Stockholders' Equity and Equi52

Stockholders' Equity and Equity Compensation - Summary of Stock Option Activity (Details) - 6 months ended Jun. 30, 2015 - $ / shares	Total
Shares
Outstanding at January 1, 2015	503,134
Granted	0
Exercised	(100,191)
Canceled/Expired	(5,546)
Outstanding at June 30, 2015	397,397
Exercisable at June 30, 2015	392,338
Weighted Average Exercise Price (in Dollars per share)
Outstanding at January 1, 2015 (in Dollars per share)	$ 18.18
Granted (in Dollars per share)	0
Exercised (in Dollars per share)	12.97
Canceled/Expired (in Dollars per share)	24.21
Outstanding at June 30, 2015 (in Dollars per share)	19.41
Exercisable at June 30, 2015 (in Dollars per share)	$ 19.44

Stockholders' Equity and Equi53

Stockholders' Equity and Equity Compensation - Additional Stock Option Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Equity [Abstract]
Amount collected from stock option exercises	$ 1,299	$ 7,645
Total intrinsic value of stock option exercises	273	3,088
Tax benefit of stock option exercises recorded in additional paid-in-capital	100	(459)
Aggregate intrinsic value of outstanding stock options	744	3,452
Aggregate intrinsic value of exercisable stock options	$ 738	$ 3,113

Stockholders' Equity and Equi54

Stockholders' Equity and Equity Compensation - Binomial Option-Pricing Model Assumptions (Details) - 6 months ended Jun. 30, 2014 - Stock Options [Member] - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant-date fair value (in Dollars per share)	$ 11.27
Volatility	41.60%
Expected term (years)	7 years
Dividend yield	0.00%
Risk-free rate	2.30%

Taxes on Income (Details)

Taxes on Income (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	28.60%	23.70%	34.60%	25.10%

Commitments and Contingencies (

Commitments and Contingencies (Details) - Pre-Acquisition Related Contingencies [Member] - Brinderson LP [Member] - USD ($)	3 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Range of possible loss, minimum		$ 0
Range of possible loss, maximum		24,000,000
Loss contingency accrual	$ 14,100,000	$ 14,500,000
Decrease in loss contingency accrual	$ 400,000

Segment Reporting (Details)

Segment Reporting (Details)	6 Months Ended
	Jun. 30, 2015segment
Segment Reporting [Abstract]
Number of operating segments	3
Number of reportable segments	3

Segment Reporting - Financial I

Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 337,096	$ 322,868	$ 646,262	$ 629,102
Gross profit	72,053	71,918	131,243	132,981
Operating income	14,523	20,619	23,648	29,753
Infrastructure Solutions [Member] | Restructuring Plan 2014 [Member]
Segment Reporting Information [Line Items]
Charges related to restructuring	5,694		9,232
Infrastructure Solutions [Member] | Restructuring Plan 2014 [Member] | Gross Profit [Member]
Segment Reporting Information [Line Items]
Charges related to restructuring	1,000		1,100
Infrastructure Solutions [Member] | Restructuring Plan 2014 [Member] | Operating Income [Member]
Segment Reporting Information [Line Items]
Charges related to restructuring	5,700		6,500
Operating Segments [Member] | Infrastructure Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	149,091	147,260	271,564	269,584
Gross profit	39,031	35,951	67,646	61,505
Operating income	12,115	12,876	19,447	14,334
Operating Segments [Member] | Corrosion Protection [Member]
Segment Reporting Information [Line Items]
Revenues	106,022	102,923	207,765	210,931
Gross profit	21,887	25,034	42,716	49,175
Operating income	936	5,277	1,436	8,968
Operating Segments [Member] | Energy Services [Member]
Segment Reporting Information [Line Items]
Revenues	81,983	72,685	166,933	148,587
Gross profit	11,135	10,933	20,881	22,301
Operating income	$ 1,472	$ 2,466	$ 2,765	$ 6,451

Segment Reporting - Summary of

Segment Reporting - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 337,096	$ 322,868	$ 646,262	$ 629,102
Gross profit	72,053	71,918	131,243	132,981
Operating income (loss)	14,523	20,619	23,648	29,753
Reportable Geographical Components [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	252,834	227,618	475,975	438,248
Gross profit	54,639	50,891	92,493	92,284
Operating income (loss)	10,644	11,693	7,724	14,089
Reportable Geographical Components [Member] | Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	39,400	42,212	86,052	84,075
Gross profit	8,491	9,934	20,680	18,996
Operating income (loss)	4,836	6,129	13,442	11,552
Reportable Geographical Components [Member] | Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	13,646	21,175	27,763	43,791
Gross profit	3,835	4,543	8,060	9,301
Operating income (loss)	469	851	1,940	1,378
Reportable Geographical Components [Member] | Other Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	31,216	31,863	56,472	62,988
Gross profit	5,088	6,550	10,010	12,400
Operating income (loss)	$ (1,426)	$ 1,946	$ 542	$ 2,734

Derivative Financial Instrume60

Derivative Financial Instruments (Details) - USD ($)	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Jul. 31, 2013
Debt Instrument [Line Items]
Gain upon settlement of cash flow hedges, (less than $0.1 million)	$ 100,000	$ 100,000
2013 Interest Rate Swap [Member]
Debt Instrument [Line Items]
Notional Amount				$ 175,000,000
Annualized borrowing rate	2.23%
Fixed interest rate				0.87%
2013 Credit Facility [Member]
Debt Instrument [Line Items]
Amount of hedged item				$ 175,000,000
Term loan	$ 279,800,000		$ 319,400,000	$ 350,000,000
Designated as Hedging Instrument [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Derivative assets	$ 674,000		$ 26,000

Derivative Financial Instrume61

Derivative Financial Instruments - Summary of the Fair Value Amounts of Derivative Instruments (Details) - Level 2 [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Net derivative asset (liability)	$ 24	$ (641)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	674	26
Derivative liabilities	737	729
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	674	26
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Other non-current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	737	729
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	87	62
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	$ 87	$ 62

Derivative Financial Instrume62

Derivative Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets:
Forward Currency Contracts	$ 761	$ 88
Total Derivative Assets		88
Liabilities:
Interest Rate Swap	737	729
Total Derivative Liabilities		729
Level 1 [Member]
Assets:
Forward Currency Contracts	0	0
Total Derivative Assets	0	0
Liabilities:
Interest Rate Swap	0	0
Total Derivative Liabilities	0	0
Level 2 [Member]
Assets:
Forward Currency Contracts	761	88
Total Derivative Assets	761	88
Liabilities:
Interest Rate Swap	737	729
Total Derivative Liabilities	737	729
Level 3 [Member]
Assets:
Forward Currency Contracts	0	0
Total Derivative Assets	0	0
Liabilities:
Interest Rate Swap	0	0
Total Derivative Liabilities	$ 0	$ 0

Derivative Financial Instrume63

Derivative Financial Instruments - Summary of Derivative Positions (Details) - Jun. 30, 2015	USD ($)	GBP (£)
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount	$ 153,125,000
Weighted Average Remaining Maturity In Years	1 year 1 month
Sell [Member] | Canadian Dollar/USD [Member]
Derivative [Line Items]
Notional Amount	$ 1,326,671
Weighted Average Remaining Maturity In Years	1 month
Average Exchange Rate	1.25	1.25
Sell [Member] | Singapore Dollar/USD [Member]
Derivative [Line Items]
Notional Amount	$ 2,453,418
Weighted Average Remaining Maturity In Years	1 year 3 months 6 days
Average Exchange Rate	1.11	1.11
Sell [Member] | Australian Dollar/USD [Member]
Derivative [Line Items]
Notional Amount	$ 2,519,436
Weighted Average Remaining Maturity In Years	6 months
Average Exchange Rate	0.76	0.76
Sell [Member] | USD/British Pound [Member]
Derivative [Line Items]
Notional Amount | £		£ 1,900,000
Weighted Average Remaining Maturity In Years	6 months
Average Exchange Rate	1.57	1.57
Sell [Member] | EURO/British Pound [Member]
Derivative [Line Items]
Notional Amount | £		£ 8,000,000
Weighted Average Remaining Maturity In Years	6 months
Average Exchange Rate	0.71	0.71