Aegion 10-K 2 Mar 15 2014 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 23, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	Aegion Corp
Document Type	10-K
Current Fiscal Year End Date	-19
Entity Public Float			$875,688,030
Entity Common Stock, Shares Outstanding		37,340,824
Amendment Flag	FALSE
Entity Central Index Key	353020
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues	$1,331,421	[1]	$1,091,420	[1]	$1,016,831	[1]
Cost of revenues	1,051,438		844,399		773,077
Gross profit	279,983		247,021		243,754
Operating expenses	234,105		178,483		168,846
Goodwill impairment	51,512		0		0
Definite-lived intangible asset impairment	12,116		0		0
Earnout reversal	0		-4,175		-10,019
Acquisition-related expenses	1,375		5,831		3,124
Restructuring charges	687		0		0
Operating income	-19,812		66,882		81,803
Other income (expense):
Interest expense	-12,943		-13,169		-10,071
Interest income	633		325		505
Other	-3,853		4,964		-1,371
Total other expense	-16,163		-7,880		-10,937
Income before taxes on income	-35,975		59,002		70,866
Taxes on income	-3,840		12,154		18,663
Income before equity in earnings of affiliated companies	-32,135		46,848		52,203
Equity in earnings of affiliated companies	570	[2]	5,159	[3]	6,359	[3]
Income from continuing operations	-31,565		52,007		58,562
Loss from discontinued operations	-3,847		-6,461		-1,713
Net income	-35,412		45,546		56,849
Non-controlling interests	-1,755		-1,195		-4,188
Net income attributable to Aegion Corporation	($37,167)		$44,351		$52,661
Basic:
Income from continuing operations (in Dollars per share)	($0.88)		$1.31		$1.38
Loss from discontinued operations (in Dollars per share)	($0.10)		($0.17)		($0.04)
Net income (in Dollars per share)	($0.98)		$1.14		$1.34
Diluted:
Income from continuing operations (in Dollars per share)	($0.88)		$1.30		$1.37
Loss from discontinued operations (in Dollars per share)	($0.10)		($0.17)		($0.04)
Net income (in Dollars per share)	($0.98)		$1.13		$1.33
[1]	Revenues and long-lived assets 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.
[2]	Bayou Coating was sold in March 2014. Income statement data in 2014 includes only those results up to the date of its sale.
[3]	Includes the financial data of Insituform-Germany through the date of its sale in June 2013.

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Net income	($35,412)		$45,546		$56,849
Other comprehensive income:
Currency translation adjustments	-27,591		-13,428		9,691
Pension activity, net of tax	-576	[1]	38	[1]	154	[1]
Deferred loss on hedging activity, net of tax	296	[2]	-255	[2]	-134	[2]
Total comprehensive income	-63,283		31,901		66,560
Less: comprehensive income attributable to noncontrolling interests	-605		-749		-4,501
Comprehensive income attributable to Aegion Corporation	($63,888)		$31,152		$62,059
[1]	Amounts presented net of tax of $(158), $11 and $46 for the years ended December 31, 2014, 2013, and 2012, respectively.
[2]	Amounts presented net of tax of $196, $(168) and $(89) for the years ended December 31, 2014, 2013 and 2012, respectively.

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parentheticals) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	($158)	$11	$46
Deferred loss on hedging activity, tax	$196	($168)	($89)

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets
Cash and cash equivalents	$174,965		$158,045
Restricted cash	2,075		483
Receivables, net	227,481		231,775
Retainage	38,318		30,831
Costs and estimated earnings in excess of billings	94,045		79,999
Inventories	59,192		58,768
Prepaid expenses and other current assets	42,046		38,522
Current assets of discontinued operations	0		5,435
Total current assets	638,122		603,858
Property, plant & equipment, less accumulated depreciation	168,213	[1]	182,303
Other assets
Goodwill	293,023		348,680
Identified intangible assets, less accumulated amortization	182,273		209,283
Investments	0		9,101
Deferred income tax assets	3,334		6,957
Other assets	10,708		14,315
Total other assets	489,338		588,336
Non-current assets of discontinued operations	0		2,921
Total Assets	1,295,673		1,377,418
Current liabilities
Accounts payable	83,285		80,417
Accrued expenses	111,617		105,466
Billings in excess of costs and estimated earnings	43,022		24,978
Current maturities of long-term debt and line of credit	26,399		22,024
Current liabilities of discontinued operations	0		2,070
Total current liabilities	264,323		234,955
Long-term debt, less current maturities	351,076		366,616
Deferred income tax liabilities	22,913		38,217
Other non-current liabilities	12,276		10,512
Non-current liabilities of discontinued operations	0		197
Total liabilities	650,588		650,497
(See Commitments and Contingencies: Note 7)
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 37,983,114 and 38,952,561, respectively	374		380
Additional paid-in capital	217,289		236,128
Retained earnings	433,641		470,808
Accumulated other comprehensive income	-24,669		2,052
Total stockholders’ equity	626,635		709,368
Non-controlling interests	18,450		17,553
Total equity	645,085		726,921
Total Liabilities and Equity	$1,295,673		$1,377,418
[1]	During the third quarter of 2014, the Company recorded asset impairments of $11.9 million related to the 2014 Restructuring Plan (see Notes 2 and 3).

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2014	Dec. 31, 2013
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)	37,360,515	37,983,114
Common stock, shares outstanding (in Shares)	37,360,515	37,983,114

Consolidated_Statements_of_Equ

Consolidated Statements of Equity (USD $)	Total	Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member]
In Thousands, except Share data, unless otherwise specified					Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member]		Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member]		Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member]		Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member]		Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member]
Balance at Dec. 31, 2011	$648,989			$394			$260,680			$373,796			$5,862			$8,257
Balance (in Shares) at Dec. 31, 2011	39,352,375
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56,849			0			0			52,661			0			4,188
Issuance of common stock upon stock option exercises, including tax benefit	1,176			1			1,175			0			0			0
Issuance of common stock upon stock option exercises, including tax benefit (in shares)	52,676
Restricted shares issued		2	0		2	0		0	0		0	0		0	0		0	0
Restricted shares issued (in Shares)		239,523	15,177
Issuance of shares pursuant to deferred stock unit awards (in Shares)	34,132
Forfeitures of restricted shares	0			0			0			0			0			0
Forfeitures of restricted shares (in Shares)	-36,325
Repurchase of common stock	-12,308			-7			-12,301			0			0			0
Repurchase of common stock (in Shares)	-704,997
Equity-based compensation expense	6,767			0			6,767			0			0			0
Investment by non-controlling interests	4,939			0			0			0			0			4,939
Distribution to non-controlling interests	-5			0			888			0			0			-893
Currency translation adjustment and derivative transactions, net	9,711			0			0			0			9,398			313
Balance at Dec. 31, 2012	716,120			390			257,209			426,457			15,260			16,804
Balance (in Shares) at Dec. 31, 2012	38,952,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45,546			0			0			44,351			0			1,195
Issuance of common stock upon stock option exercises, including tax benefit	899			0			899			0			0			0
Issuance of common stock upon stock option exercises, including tax benefit (in shares)	29,511			29,511
Restricted shares issued		4	0		4	0		0	0		0	0		0	0		0	0
Restricted shares issued (in Shares)					435,025	13,761
Issuance of shares pursuant to deferred stock unit awards (in Shares)				7,029
Forfeitures of restricted shares	-2			-2			0			0			0			0
Forfeitures of restricted shares (in Shares)				-236,388
Repurchase of common stock	-27,648			-12			-27,636			0			0			0
Repurchase of common stock (in Shares)				-1,218,385
Equity-based compensation expense	5,647			0			5,647			0			0			0
Currency translation adjustment and derivative transactions, net	-13,645			0			9			0			-13,208			-446
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	-35,412			0			0			-37,167			0			1,755
Issuance of common stock upon stock option exercises, including tax benefit	8,075			5			8,070			0			0			0
Issuance of common stock upon stock option exercises, including tax benefit (in shares)	526,359			526,359
Restricted shares issued		2	0		2	0		0	0		0	0		0	0		0	0
Restricted shares issued (in Shares)					242,722	15,277
Issuance of shares pursuant to deferred stock unit awards (in Shares)				31,794
Forfeitures of restricted shares	-1			-1			0			0			0			0
Forfeitures of restricted shares (in Shares)				-104,013
Repurchase of common stock	-31,085			-12			-31,073			0			0			0
Repurchase of common stock (in Shares)				-1,334,738
Equity-based compensation expense	5,073			0			5,073			0			0
Purchase of non-controlling interests	-617			0			-909			0			0			292
Currency translation adjustment and derivative transactions, net	-27,871			0			0			0			-26,721			-1,150
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

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Cash flows from operating activities:
Net income	($35,412)		$45,546		$56,849
Loss from discontinued operations	3,847		6,461		1,713
Income from continuing operations	-31,565		52,007		58,562
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	44,312		40,329		37,658
Gain on sale of fixed assets	-310		-816		-397
Equity-based compensation expense	5,073		5,647		6,767
Deferred income taxes	-16,816		-2,675		-3,004
Equity in earnings of affiliated companies	-570	[1]	-5,159	[2]	-6,359	[2]
Non-cash restructuring charges	20,592		0		0
Fixed asset impairment	11,870		0		0
Definite-lived intangible asset impairment	12,116		0		0
Goodwill impairment	51,512		0		0
Debt Issuance Cost	157		1,964		0
Earnout reversal	0		-4,175		-10,019
Loss on sale of Ka-te Insituform AG	516		0		0
Loss on foreign currency transactions	627		2,425		1,049
Other	1,279		1,588		-4,793
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	-454		-102		-299
Return on equity of affiliated companies	590		10,691		11,034
Receivables net, retainage and costs and estimated earnings in excess of billings	-41,211		8,222		7,875
Inventories	-5,286		-736		-3,376
Prepaid expenses and other assets	3,465		-9,685		2,754
Accounts payable and accrued expenses	25,097		2,604		12,634
Other operating	402		-2,293		865
Net cash provided by operating activities of continuing operations	81,868		88,065		110,951
Net cash provided by (used in) operating activities of discontinued operations	-1,045		-3,761		-230
Net cash provided by operating activities	80,823		84,304		110,721
Cash flows from investing activities:
Capital expenditures	-32,899		-26,085		-44,738
Proceeds from sale of fixed assets	1,547		3,435		4,401
Patent expenditures	-1,923		-2,032		-552
Restricted cash related to investing activities	-1,153		0		0
Proceeds from sale of Ka-te Insituform AG	1,123		0		0
Net cash used in investing activities of continuing operations	-23,240		-150,145		-82,262
Net cash provided by (used in) investing activities of discontinued operations	1,045		845		-1,156
Net cash used in investing activities	-22,195		-149,300		-83,418
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises, including tax effects	8,615		594		1,178
Repurchase of common stock	-31,085		-27,648		-12,308
Investments from noncontrolling interests	0		0		4,939
Purchase of or distributions to noncontrolling interests	-617		-287		-5
Payment of earnout related to acquistion of CRTS, Inc.	0		-2,112		0
Credit facility financing fees	-783		-5,013		0
Proceeds on notes payable	1,284		1,541		7,160
Principal payments on notes payable	0		-183		-2,768
Proceeds from line of credit	18,000		0		26,000
Repayments of Lines of Credit	-8,000		0		0
Proceeds from long-term debt	0		385,500		983
Principal payments on long-term debt	-22,039		-253,500		-25,000
Net cash provided by financing activities	-34,625		98,892		179
Effect of exchange rate changes on cash	-7,083		-9,527		65
Net increaes (decrease) in cash and cash equivalents for the period	16,920		24,369		27,547
Cash and cash equivalents, beginning of period	158,045		133,676		106,129
Cash and cash equivalents, end of period	174,965		158,045		133,676
Cash paid for:
Interest	9,602		8,700		7,945
Net income taxes paid	12,594		11,630		18,456
Brinderson LP [Member]
Cash flows from investing activities:
Purchase of business, net of cash acquired	1,000		-143,763		0
Fyfe LA [Member]
Cash flows from investing activities:
Purchase of business, net of cash acquired	0		0		-3,048
Fyfe Asia [Member]
Cash flows from investing activities:
Purchase of business, net of cash acquired	0		0		-38,841
Fyfe NA [Member]
Cash flows from investing activities:
Purchase of business, net of cash acquired	0		0		516
Insituform Germany [Member]
Adjustments to reconcile to net cash provided by operating activities:
Gain on sale of interests in German joint venture	0		-11,771		0
Cash flows from investing activities:
Sale of interests in German joint venture	0		18,300		0
Bayou Coating [Member]
Adjustments to reconcile to net cash provided by operating activities:
Gain on sale of interests in German joint venture	472		0		0
Cash flows from investing activities:
Sale of interests in German joint venture	$9,065		$0		$0
[1]	Bayou Coating was sold in March 2014. Income statement data in 2014 includes only those results up to the date of its sale.
[2]	Includes the financial data of Insituform-Germany through the date of its sale in June 2013.

Note_1_Description_of_Business

Note 1 - Description of Business	12 Months Ended
	Dec. 31, 2013
Description of Business [Abstract]
Description of Business [Text Block]	DESCRIPTION OF BUSINESS
	Aegion Corporation is a global leader in infrastructure protection and maintenance, providing proprietary technologies and services to: (i) protect against the corrosion of industrial pipelines; (ii) rehabilitate and strengthen water, wastewater, energy and mining piping systems and buildings, bridges, tunnels and waterfront structures; and (iii) utilize integrated professional services in engineering, procurement, construction, maintenance and turnaround services for a broad range of energy related industries. The Company’s business activities include manufacturing, distribution, maintenance, construction, installation, coating and insulation, cathodic protection, research and development and licensing. The Company’s acquisition of Brinderson, L.P. and related entities (“Brinderson”) on July 1, 2013 opened new markets for the Company through the maintenance, engineering and construction services for downstream and upstream facilities in the North American oil and gas market. The Company’s products and services are currently utilized and performed in more than 80 countries across six continents. The Company believes that the depth and breadth of its products and services platform make Aegion a leading “one-stop” provider for the world’s infrastructure rehabilitation and protection needs.
	The Company is primarily built on the premise that it is possible to use technology to extend the structural design life and maintain, if not improve, the performance of infrastructure, mostly pipe. The Company is proving that this expertise can be applied in a variety of markets to protect pipelines in oil, gas, mining, wastewater and water applications and extending this to the rehabilitation and maintenance of commercial structures and the provision of professional services in energy-related industries. Many types of infrastructure must be protected from the corrosive and abrasive materials that pass through or near them. The Company’s expertise in non-disruptive corrosion engineering and abrasion protection is now wide-ranging, opening new markets for growth. The Company has a long history of product development and intellectual property management. The Company manufactures most of the engineered solutions it creates as well as the specialized equipment required to install them. Finally, decades of experience give the Company an advantage in understanding municipal, energy, mining, industrial and commercial customers. Strong customer relationships and brand recognition allow the Company to support the expansion of existing and innovative technologies into new high growth end markets.
	The Company originally incorporated in Delaware in 1980 to act as the exclusive United States licensee of the Insituform® cured-in-place pipe (“CIPP”) process, which Insituform’s founder invented in 1971. The Insituform® CIPP process served as the first trenchless technology for rehabilitating sewer pipelines and has enabled municipalities and private industry to avoid the extraordinary expense and extreme disruption that can result from conventional “dig-and-replace” methods. For the past 40 years, the Company has maintained its leadership position in the CIPP market from manufacturing to technological innovations and market share.
	In order to strengthen the Company’s ability to service the emerging demands of the infrastructure protection market and to better position the Company for sustainable growth, the Company embarked on a diversification strategy in 2009 to expand its product and service portfolio and its geographical reach. Through a series of strategic initiatives and key acquisitions, the Company now possesses a broad portfolio of cost-effective solutions for rehabilitating and maintaining aging or deteriorating infrastructure, protecting new infrastructure from corrosion worldwide and providing integrated professional services in engineering, procurement, construction, maintenance, and turnaround services for upstream and downstream oil companies.
	Recognizing that the breadth of our offerings expanded beyond our flagship Insituform® brand, which constituted less than half of our revenue in 2011, we reorganized Insituform Technologies, Inc. (“Insituform”), our parent company at the time, into a new holding company structure in October 2011. Aegion became the new parent company and Insituform became a wholly owned subsidiary of Aegion. Aegion reflects our mission of extending our leadership capabilities to furnish products and services to provide long-term protection for water and wastewater pipes, oil and gas pipelines and infrastructure as well as commercial and governmental structures and transportation infrastructure.
	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 Plan”) 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. Activities with respect to Insituform’s contracting operations in India, Hong Kong, Malaysia and Singapore are expected to be concluded by the end of the third quarter of 2015 as Insituform completes existing backlog in the affected countries. See further discussion in Note 2 as to the impact that the 2014 Restructuring Plan had on the Europe and Asia-Pacific goodwill reporting units.
	In December 2014, the Company sold its wholly-owned subsidiary, Ka-te Insituform AG (“Ka-te”), to the Marco Daetwyler Gruppe AG, a Swiss company, for the sale price of CHF 1.1 million (approximately $1.1 million). In connection with the sale, the Company entered in to a five-year exclusive tube supply agreement whereby Ka-te will source all of its liners from Insituform Linings Ltd. 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 June 2013, the Company sold its fifty percent (50%) interest in Insituform Rohrsanierungstechniken GmbH (“Insituform-Germany”) to Per Aarsleff A/S, a Danish company (“Aarsleff”). Insituform-Germany, a company that was jointly owned by Aegion and Aarsleff, is active in the business of no-dig pipe rehabilitation in Germany, Slovakia and Hungary. The sale price was €14 million, approximately $18.3 million. The sale resulted in a gain on the sale of approximately $11.3 million (net of $0.5 million of transaction expenses) recorded in other income (expense) on the consolidated statement of operations. In connection with the sale, Insituform-Germany also entered into a tube supply agreement with the Company whereby Insituform-Germany will purchase on an annual basis at least GBP 2.3 million, approximately $3.6 million, of felt cured-in-place pipe (“CIPP”) liners during the two-year period from June 26, 2013 to June 30, 2015.
	In April 2012, the Company purchased Fyfe Group LLC’s Asian operations (“Fyfe Asia”), which included all of the equity interests of Fyfe Asia Pte. Ltd, a Singaporean entity (and its interest in two joint ventures located in Borneo and Indonesia), Fyfe (Hong Kong) Limited, Fibrwrap Construction (M) Sdn Bhd, a Malaysian entity, Fyfe Japan Co. Ltd., a Japanese entity, and Fibrwrap Construction Pte. Ltd and Technologies & Art Pte. Ltd., Singaporean entities. Customers in India and China are served through a product supply and license arrangement. Fyfe Asia provides Fibrwrap® installation services throughout Asia, as well as provides product and engineering support to installers and applicators of fiber reinforced polymer systems in Asia. The cash purchase price at closing was $40.7 million. The purchase price was funded out of the Company’s cash balances and by borrowing $18.0 million against the Company’s line of credit.
	In January 2012, the Company purchased Fyfe Group LLC’s Latin American operations (“Fyfe LA”), which included all of the equity interests of Fyfe Latin America S.A., a Panamanian entity (and its interest in various joint ventures located in Peru, Costa Rica, Chile and Colombia), Fyfe – Latin America S.A. de C.V., an El Salvadorian entity, and Fibrwrap Construction Latin America S.A., a Panamanian entity. Fyfe LA provides Fibrwrap® installation services throughout Latin America, as well as product and engineering support to installers and applicators of fiber reinforced polymer systems in Latin America. The cash purchase price at closing was $2.3 million and funded out of the Company’s cash balances. During the first quarter of 2012, the Company paid the sellers an additional $1.1 million based on a preliminary working capital adjustment. An annual payout can be earned based on the achievement of certain performance targets in each year over the three-year period ending December 31, 2014. No annual payout was earned as the performance targets were not met. As of December 31, 2013, the Company calculated the fair value of the contingent consideration arrangement to be zero, which is based on Level 3 inputs as defined in Note 11.
	Corrosion Protection Segment
	As part of the 2014 Restructuring Plan, the Company made the decision to shutter two older and redundant fusion bonded epoxy coating plants and consolidate and terminate certain land leases at The Bayou Companies, LLC’s (“Bayou”) Louisiana facility. The actions taken to restructure Bayou’s Louisiana operations 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. See further discussion in Note 2 as to the impact that the 2014 Restructuring Plan had on Bayou’s goodwill reporting unit.
	On March 31, 2014, the Company sold its forty-nine percent (49%) interest in Bayou Coating, L.L.C. (“Bayou Coating”) to Stupp Brothers Inc. (“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, which represented forty-nine percent (49%) of the book value of Bayou Coating as of December 31, 2013. Such book value was determined in accordance with the requirements of the joint venture agreement and was based on 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. The Company had previously received an indication from Stupp of its intent to exercise such option and, in the second quarter of 2013 in connection with such indication, the Company recognized a non-cash charge of $2.7 million ($1.8 million post-tax) related to the goodwill allocated to the joint venture as part of the purchase price accounting associated with the 2009 acquisition of Bayou. The non-cash charge represented the Company’s then current estimate of the difference between the carrying value of the investment on the balance sheet and the amount the Company would receive in connection with the exercise. 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 percent (59%) equity interest in Delta Double Jointing, LLC (“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. As a result, Bayou Delta is now a wholly owned subsidiary of the Company.
	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 New Iberia, Louisiana. Financial results for BWW were part of the Company’s Energy and Mining segment for financial reporting purposes. BWW ceased bidding new work and substantially completed all ongoing projects during the second quarter of 2013. As a result of the closure of BWW, Aegion recognized a pre-tax, non-cash charge of approximately $3.9 million ($2.4 million after-tax, or $0.06 per diluted share) to reflect the impairment of goodwill and intangible assets. The Company also recognized additional non-cash impairment charges for equipment and other assets of approximately $1.1 million on a pre-tax basis ($0.7 million on an after-tax basis, or $0.02 per diluted share), which also was recorded in the second quarter of 2013. The Company also incurred cash charges to exit the business of approximately $0.1 million on a pre-tax and post-tax basis, which included property, equipment and vehicle lease termination and buyout costs, employee termination benefits and retention incentives, among other ancillary shut-down expenses. During the fourth quarter of 2014, the Company completed final liquidation of BWW. Included within the final liquidation was the settlement of outstanding receivables with a single customer associated with a larger fabrication project. The Company also incurred cash charges of $1.4 million related to certain professional fees incurred during dissolution as well as in connection with the settlement discussed above. This resulted in a recorded pre-tax charge of approximately $6.0 million within discontinued operations.
	In March 2012, the Company organized United Special Technical Services LLC (“USTS”), a joint venture located in the Sultanate of Oman between United Pipeline Systems and Special Technical Services LLC, an Omani company (“STS”), for the purpose of executing pipeline, piping and flow line high-density polyethylene lining services throughout the Middle East and Northern Africa. The Company holds a fifty-one percent (51%) equity interest in USTS and STS holds the remaining forty-nine percent (49%) equity interest. USTS initiated operations in the second quarter of 2012.
	Energy Services Segment
	On July 1, 2013, the Company acquired the equity interests of Brinderson, L.P., a California limited partnership, General Energy Services, a California corporation, and Brinderson Constructors, Inc., a California corporation (collectively, “Brinderson”). The transaction purchase price was $150.0 million, which resulted in a cash purchase price at closing of $147.6 million after preliminary working capital adjustments and an adjustment to account for cash held in the business at closing. The transaction was funded by borrowings under the Company’s $650.0 million senior secured credit facility as discussed in Note 6. During the fourth quarter of 2014, the Company finalized the settlement of negotiated working capital for the Brinderson acquisition as well as escrow claims made pursuant to the purchase agreement. As as a result of the settlement, the Company received proceeds of approximately $5.5 million, $1.0 million of which was recorded as a purchase price adjustment related to working capital and the remaining $4.5 million was recorded as an offset to operating expense in the Consolidated Statement of Operations.
	Brinderson is a leading integrated service provider of maintenance, construction, engineering and turnaround activities for the upstream and downstream oil and gas markets. Primarily focused on serving large oil and gas customers in California, Brinderson’s competitive advantages include its industry-leading safety record, a strong reputation for reliability and quality and comprehensive solutions needed for upstream oil field and downstream major refinery maintenance, repairs and retrofits. These core competencies position Brinderson to meet the growing demand for non-discretionary operating and maintenance expenditures.
	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 and trademarks and patents and other acquired technologies. Acquisitions generally result in goodwill related to purchase price, assembled workforce, growth opportunities and market potential. The goodwill associated with the Brinderson acquisition is deductible for tax purposes. During 2014, certain pre-acquisition matters were identified by the Company where a loss is both probable and reasonably estimable. Accordingly, the Company increased recorded goodwill by $14.5 million. During the fourth quarter of 2014, a final working capital settlement was reached and resulted in a $1.0 million reduction to the purchase price.
	The Brinderson acquisition made the following contributions to the Company’s revenues and profits (in thousands):
		Years Ended December 31,
		2014			2013
	Revenues	$	305,807		$	108,233
	Net income (1)	13,310			4,838
	_____________________
	(1)	Net income includes an allocation of corporate expenses that is not necessarily an indication of the entity’s operations on a stand alone basis.
	The following unaudited pro forma summary presents combined information of the Company as if the Brinderson acquisition had occurred at the beginning of the year preceding its acquisition (in thousands):
		2013
	Revenues	$	1,199,653
	Net income (1)	50,384
	_____________________
	(1)	Includes pro-forma adjustments for purchase price depreciation and amortization as if those intangibles were recorded as of January 1 of the year preceding the respective acquisition date.
	The transaction purchase price to acquire Brinderson was $150.0 million, which included a cash purchase price at closing of $147.6 million after preliminary working capital adjustments and an adjustment to account for cash held in the business at closing. The final working capital settlement with the previous owners resulted in a $1.0 million reduction in purchase price for a final purchase price of $146.6 million.
	The following table summarizes the fair value of identified assets and liabilities of the Brinderson acquisition at its acquisition date (in thousands):
		Brinderson
	Cash	$	3,842
	Receivables and cost and estimated earnings in excess of billings	28,353
	Prepaid expenses and other current assets	655
	Property, plant and equipment	6,848
	Identified intangible assets	60,210
	Other assets	1,071
	Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	(30,622		)
	Total identifiable net assets	$	70,357
	Total consideration	$	146,605
	Less: total identifiable net assets	70,357
	Goodwill at December 31, 2014	$	76,248
	The following adjustment was made during the fourth quarter of 2014 relative to the acquisition of Brinderson as the Company completed its purchase price accounting (in thousands):
		Brinderson
	Goodwill at December 31, 2013	$	77,248
	Decrease in goodwill related to working capital adjustment	(1,000		)
	Goodwill at December 31, 2014	$	76,248
	During the second quarter of 2014, and in connection with the 2012 acquisition of Fyfe Group LLC’s Asian operations (“Fyfe Asia”), the Company agreed to a working capital settlement with the previous owners, which increased the purchase price and related goodwill by $1.1 million for a final purchase price of $21.1 million (in thousands):
		Fyfe Asia
	Goodwill at December 31, 2013	$	20,008
	Increase in goodwill related to working capital adjustment	1,098
	Goodwill at December 31, 2014	$	21,106

Note_2_Accounting_Policies

Note 2 - Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	ACCOUNTING POLICIES
	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries and majority-owned subsidiaries in which the Company is deemed to be the primary beneficiary. All significant intercompany transactions and balances have been eliminated. Additionally, certain prior year amounts have been reclassified to conform to the current year presentation.
	Accounting Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	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 the third and fourth quarters of 2014, 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 December 31, 2014 and 2013, the Company had $(23.4) million and $0.6 million, respectively, related to currency translation adjustments, $(0.7) million and $1.2 million, respectively, related to derivative transactions and $(0.5) million and $0.2 million, respectively, related to pension activity in accumulated other comprehensive income.
	Research and Development
	The Company expenses research and development costs as incurred. Research and development costs of $2.6 million, $2.6 million and $1.8 million for the years ended December 31, 2014, 2013 and 2012, respectively, are included in operating expenses in the accompanying consolidated statements of 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 9 for additional information regarding taxes on income.
	Equity-Based Compensation
	The Company records expense for equity-based compensation awards, including restricted shares of common stock, performance awards, stock options and stock units based on the fair value recognition provisions contained in FASB ASC 718, Compensation – Stock Compensation (“FASB ASC 718”). The Company records the expense using a straight-line basis over the vesting period of the award. Fair value of stock option awards is determined using an option pricing model. Assumptions regarding volatility, expected term, dividend yield and risk-free rate are required for valuation of stock option awards. Volatility and expected term assumptions are based on the Company’s historical experience. The risk-free rate is based on a U.S. Treasury note with a maturity similar to the option award’s expected term. Fair value of restricted stock, restricted stock unit and deferred stock unit awards is determined using the Company’s closing stock price on the award date. The shares of restricted stock and restricted stock units that are awarded are subject to performance and/or service restrictions. The Company makes forfeiture rate assumptions in connection with the valuation of restricted stock and restricted stock unit awards that could be different than actual experience. During 2012, the Company introduced three-year performance based stock unit awards for a number of its key employees. These awards are subject to performance and service restrictions. The awards contain financial targets for each year in the three-year performance period as well as cumulative totals. These awards have a threshold, target and maximum amount of shares that can be awarded based on the Company’s financial results for each year and cumulative three-year period. The awards allow an employee to earn back a portion of the shares that were unearned in a prior year, if cumulative performance targets are met. Discussion of the Company’s application of FASB ASC 718 is described in Note 8.
	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 Brinderson 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. Brinderson enters into contracts with its customers 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. Brinderson also performs 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.
	Earnings per Share
	Earnings per share have been calculated using the following share information:
			2014	2013		2012
	Weighted average number of common shares used for basic EPS		37,651,492	38,692,658		39,222,737
	Effect of dilutive stock options and restricted and deferred stock unit awards		—	389,684		313,654
	Weighted average number of common shares and dilutive potential common stock used in dilutive EPS		37,651,492	39,082,342		39,536,391
	The Company excluded 318,059 stock options and restricted and deferred stock units in 2014 from the diluted earnings per share calculation for the Company’s common stock because of the reported net loss for the period. The Company excluded 164,014, 318,026 and 223,536 stock options in 2014, 2013 and 2012, 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.
	Classification of Current Assets and Current Liabilities
	The Company includes in current assets and current liabilities certain amounts realizable and payable under construction contracts that may extend beyond one year. The construction periods on projects undertaken by the Company generally range from less than one month to 24 months.
	Cash, Cash Equivalents and Restricted Cash
	The Company classifies highly liquid investments with original maturities of 90 days or less as cash equivalents. Recorded book values are reasonable estimates of fair value for cash and cash equivalents. Restricted cash primarily consists of funds reserved for legal requirements, payments from certain customers placed in escrow in lieu of retention in case of potential issues regarding future job performance by the Company, or advance customer payments and compensating balances for bank undertakings in Europe. Restricted cash related to operations is similar to retainage and is therefore classified as a current asset, consistent with the Company’s policy on retainage. Changes in restricted cash flows are reported in the consolidated statements of cash flows based on the nature of the restriction.
	Inventories
	Inventories are stated at the lower of cost (first-in, first-out) or market. Actual cost is used to value raw materials and supplies. Standard cost, which approximates actual cost, is used to value work-in-process, finished goods and construction materials. Standard cost includes direct labor, raw materials and manufacturing overhead based on normal capacity. For certain businesses within our Corrosion Protection segment, the Company uses actual costs or average costs for all classes of inventory.
	Retainage
	Many of the contracts under which the Company performs work contain retainage provisions. Retainage refers to that portion of revenue earned by the Company but held for payment by the customer pending satisfactory completion of the project. The Company generally invoices its customers periodically as work is completed. Under ordinary circumstances, collection from municipalities is made within 60 to 90 days of billing. In most cases, 5% to 15% of the contract value is withheld by the municipal owner pending satisfactory completion of the project. Collections from other customers are generally made within 30 to 45 days of billing. Unless reserved, the Company believes that all amounts retained by customers under such provisions are fully collectible. Retainage on active contracts is classified as a current asset regardless of the term of the contract. Retainage is generally collected within one year of the completion of a contract, although collection can extend beyond one year from time to time. As of December 31, 2014, retainage receivables aged greater than 365 days approximated 10% of the total retainage balance and collectibility was assessed as described in the allowance for doubtful accounts section below.
	Allowance for Doubtful Accounts
	Management makes estimates of the uncollectibility of accounts receivable and retainage. The Company records an allowance based on specific accounts to reduce receivables, including retainage, to the amount that is expected to be collected. The specific allowances are reevaluated and adjusted as additional information is received. After all reasonable attempts to collect the receivable or retainage have been explored, the account is written off against the allowance. The Company also includes reserves related to certain accounts receivable that may be in litigation or dispute.
	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.
	Impairment Review - September 30, 2014
	As part of the 2014 Restructuring Plan, the Company evaluated the long-lived assets of its global operations affected by the restructuring initiative. The affected reporting units were (i) the Bayou reporting unit (“Bayou Reporting Unit”); (ii) the European Sewer and Water Rehabilitation (“Europe”) reporting unit; and (iii) the Asia-Pacific Sewer and Water Rehabilitation (“Asia-Pacific”) reporting unit. The results of the Bayou Reporting Unit and its related asset groups are reported within the Corrosion Protection reportable segment. The results of Europe and Asia-Pacific and their related asset groups are reported within the Infrastructure Solutions reportable segment.
	In the early stages of the evaluation process, the Company reviewed the financial performance of all at risk asset groups within each affected reporting unit. Due to the ongoing weak economic conditions and weak economic outlook for certain at risk asset groups, the Company decided to no longer focus on the possible growth opportunities within these businesses; therefore, the Company would no longer provide cash flow or operational support to these businesses. This decision was deemed a significant adverse change in the extent or manner in which the asset is currently being used, and as such, the Company performed an asset impairment review as of September 30, 2014 for all of its at risk asset groups within each of the affected reporting units in accordance with ASC 360, Property, Plant and Equipment (“FASB ASC 360”).
	The assets of each asset group represent the lowest level for which identifiable cash flows can be determined independent of other groups of assets and liabilities. The Company developed internal forward business plans under the guidance of local and regional leadership to determine the undiscounted expected future cash flows derived from each of the at risk asset groups’ long-lived assets. Such were based on management’s best estimates considering the likelihood of various outcomes. Based on the internal projections, the Company determined that the undiscounted expected future cash flows for all of the identified at risk asset groups were less than the carrying value of the assets, and as a result, engaged a third-party valuation firm to assist in determining the fair value of long-lived assets at these at risk asset groups.
	In order to determine the impairment amount of long-lived assets, the Company first determined the fair value of each key component of its long-lived assets at each asset group. For property and equipment, the Company primarily utilized the cost and market approaches, which involved the use of significant estimates and assumptions such as salvage and scrap market data and producer price indices. The Company also considered functional and economic obsolescence related to the business and the assets. Based upon the results of the analysis, the at risk asset groups with a fair value less than the carrying value of their respective assets included Bayou and Bayou Delta of the Bayou Reporting Unit; France of the Europe reporting unit; and Malaysia and India of the Asia-Pacific reporting unit. Accordingly, the Company recorded a total impairment charge of $11.9 million in the third quarter of 2014, which consisted of $10.9 million related to Bayou, $0.4 million related to Bayou Delta, $0.2 million related to France, $0.3 million related to Malaysia and $0.1 million related to India. The impairment charge was primarily recorded to cost of revenues in the Consolidated Statements of Operations.
	Included within the impairment assessment were Bayou-related intangible assets such as tradenames and customer relationships that were also tested on an undiscounted cash flow basis. For customer relationships, the undiscounted expected future cash flows were less than the carrying value; thus, the Company engaged a third-party valuation firm to assist in determining the fair value of customer relationships recorded at Bayou. In order to determine the impairment amount of the customer relationships intangible asset, the Company calculated the fair value of the intangible based on the multi-period excess earnings method, which utilizes discounted cash flows to evaluate the net earnings attributable to the asset being measured. Key assumptions used in assessment include the discount rate (based on weighted-average cost of capital), revenue growth rates, contributory asset charges and working capital needs, which were based on current market conditions and were consistent with internal management projections.
	Based on the results of the valuation, the carrying amount of the customer relationship intangible asset at Bayou exceeded the fair value and resulted in a full impairment as of September 30, 2014. Accordingly, the Company recorded a $10.9 million impairment charge in the third quarter of 2014. The impairment charge was recorded to definite-lived intangible asset impairment in the Consolidated Statements of Operations.
	Annual Impairment Assessment - October 1, 2014
	As a result of the annual impairment assessment in accordance with FASB ASC 350, Intangibles – Goodwill and Other (“FASB ASC 350”), the Fyfe Rehabilitation (“Fyfe”) reporting unit had a fair value below its carrying value, which caused the Company to review the financial performance of all at risk asset groups within that reporting unit in accordance with FASB ASC 360. The results of Fyfe and its related asset groups are reported within the Infrastructure Solutions reportable segment.
	The assets of each asset group represent the lowest level for which identifiable cash flows can be determined independent of other groups of assets and liabilities. The Company developed internal forward business plans under the guidance of local and regional leadership to determine the undiscounted expected future cash flows derived from each of the at risk asset groups’ long-lived assets. Such were based on management’s best estimates considering the likelihood of various outcomes. Based on internal cash flow projections, the Company determined that the undiscounted expected future cash flows for the Fyfe Latin America asset group was less than the carrying value of its assets, and as a result, engaged a third-party valuation firm to assist in determining the fair value of long-lived assets at this at risk asset group, which primarily consisted of a customer relationship intangible asset. In order to determine the impairment amount of the customer relationships intangible asset, the Company calculated the fair value of the intangible based on the multi-period excess earnings method, which utilizes discounted cash flows to evaluate the net earnings attributable to the asset being measured. Key assumptions used in assessment include the discount rate (based on weighted-average cost of capital), revenue growth rates, contributory asset charges and working capital needs, which were based on current market conditions and were consistent with internal management projections.
	Based on the results of the valuation, the carrying amount of the customer relationship intangible asset at Fyfe Latin America exceeded the fair value and resulted in a $1.2 million impairment charge in the fourth quarter of 2014. The impairment charge was recorded to definite-lived intangible asset impairment in the Consolidated Statements of Operations.
	Impairment Review - December 31, 2014
	During the fourth quarter of 2014, certain reporting units operating in the energy sector experienced customer-driven delays, work order cancellations, and canceled sales opportunities as a result of declining crude oil prices since October 2014. As a result, the Company evaluated the long-lived assets of its operations affected by these circumstances and determined that a significant adverse change had occurred in the extent or manner in which these assets are currently being used. As such, the Company performed an asset impairment review as of December 31, 2014, in accordance with FASB ASC 360, for all of its at risk asset groups within the CRTS and Bayou Reporting Units. The results of these reporting units and their related asset groups are reported within the Corrosion Protection reportable segment.
	The assets of each asset group represent the lowest level for which identifiable cash flows can be determined independent of other groups of assets and liabilities. The Company developed internal forward business plans under the guidance of local and regional leadership to determine the undiscounted expected future cash flows derived from each of the at risk asset groups’ long-lived assets. Such were based on management’s best estimates considering the likelihood of various outcomes. Based on the internal projections, the Company determined that the undiscounted expected future cash flows for all of the identified at risk asset groups exceeded the carrying value of the assets, and as such, no impairment to recorded long-lived assets was required.
	The fair value estimates described above were determined using observable inputs and significant unobservable inputs, which are based on level 3 inputs as defined in Note 11.
	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 segment 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 segment’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.
Impairment Review - September 30, 2014
As a result of the 2014 Restructuring Plan, the Company evaluated the goodwill of its global operations affected by the restructuring initiative and determined that a triggering event had occurred. As such, the Company performed a goodwill impairment review for each affected reporting unit as of September 30, 2014. The Company’s reporting units adversely affected by the 2014 Restructuring Plan were Bayou, Europe and Asia-Pacific. In accordance with the provisions of FASB ASC 350, the Company determined the fair value of its reporting units and compared such fair value to the carrying value of those reporting units. For all three reporting units, fair value exceeded carrying value, and as such, no impairment to recorded goodwill was required.
Significant assumptions used in the Company’s goodwill review included: (i) discount rates ranging from 13.0% to 16.5%; (ii) annual revenue growth rates generally ranging from 2% to 7%; (iii) sustained or slightly increased gross margins; (iv) peer group EBITDA multiples; and (v) terminal values for each reporting unit using a long-term growth rate of 2.5% to 3.0%. If actual results differ from estimates used in these calculations, the Company could incur future impairment charges.
For the Bayou reporting unit, the excess of fair value in relation to its carrying value was 10.2%. The values derived from both the income approach and market approach decreased from the October 1, 2013 analysis; however, the fair value in relation to its carrying value improved from the prior year due to a decrease in carrying value as of the valuation dates. During the first nine months of 2014, the carrying value of the Bayou reporting unit was lowered due to the sale of its interest in Bayou Coating as described in Note 1 and the impairment of tangible and intangibles assets described above. The fair value for the Bayou reporting unit decreased $48.0 million, or 30.9%, from the prior year analysis due to the suspension of a material contract, a lack of project activity available in the Gulf of Mexico market and customer-driven project delays. The impairment analysis assumed a weighted average cost of capital of 13.5% and a long-term growth rate of 3%. The analysis also included an annual revenue growth rate of approximately 5% which was modestly higher than the prior year actual results, but at a level that is below the reporting unit’s five-year average. Projected cash flows anticipate a modest recovery in the Gulf of Mexico market beginning in 2015. The Company noted improved visibility into larger bidding opportunities for deep water drilling activities in the Gulf of Mexico; however, there is a significant lead time from drilling to the point of building the pipeline infrastructure, or gather lines, to bring oil and natural gas onshore for refinement. This extended lead time creates added uncertainty and could have a material negative impact on long-term projected cash flows. Additionally, projected cash flows related to the Bayou reporting unit’s new insulation facility located in Louisiana are subject to final operational testing and largely dependent in 2015 and 2016 on a single, large customer with whom the Company has a long-standing history. The Bayou reporting unit’s Canadian coating operation, while not as reliant on larger projects, is dependent upon overall increased project activity in order to realize the cash flow projections included in the impairment analysis. If any of these assumptions do not materialize in a manner consistent with the Company’s expectations, there is risk of impairment to recorded goodwill.
For the Europe reporting unit, the excess of fair value in relation to its carrying value was 9.3%. The values derived from both the income approach and market approach decreased from the October 1, 2013 analysis, and the fair value in relation to its carrying value declined from the prior year due to exiting certain European operations. The fair value for Europe decreased $8.2 million, or 9.5%, from the prior year analysis. The impairment analysis assumed a weighted average cost of capital of 14.0% and a long-term growth rate of 2.5%. The analysis also included an annual revenue growth rate of approximately 5% which is slightly below the prior year results and certain cost savings expected to be achieved through the 2014 Restructuring Plan. In addition, projected cash flows were also based, in part, on the successful closure or sale of the Insituform contacting operations in France and Switzerland. In December 2014, the Company sold the Switzerland operations. If any of these assumptions do not materialize in a manner consistent with the Company’s expectations, there is risk of impairment to recorded goodwill.
For the Asia-Pacific reporting unit, the excess of fair value in relation to its carrying value was 12.1%. The values derived from both the income approach and market approach decreased from the October 1, 2013 analysis, and the fair value in relation to its carrying value declined from the prior year due to exiting certain Asia-Pacific operations, many of which were underperforming. The fair value for Asia-Pacific decreased $18.0 million, or 36.4%, from the prior year analysis. The impairment analysis assumed a weighted average cost of capital of 14.0% and a long-term growth rate of 3.0%. The analysis also included an annual revenue growth rate of approximately 5% for the remaining operations and certain cost savings expected to be achieved through the 2014 Restructuring Plan. In addition, projected cash flows were also based, in part, on the successful closure of the Insituform contracting operations in India, Hong Kong, Malaysia and Singapore. If any of these assumptions do not materialize in a manner consistent with the Company’s expectations, there is risk of impairment to recorded goodwill.
The total value of goodwill recorded at September 30, 2014 for the Bayou, Europe and Asia-Pacific reporting units was $29.7 million, $20.4 million and $5.3 million, respectively.
Annual Impairment Assessment - October 1, 2014
The Company had nine reporting units for purposes of assessing goodwill at October 1, 2014 as follows: North American Rehabilitation, Europe, Asia-Pacific, United Pipeline Systems, Bayou, Corrpro, CRTS, Brinderson and Fyfe.
Significant assumptions used in our October 2014 goodwill review included: (i) discount rates ranging from 12.5% to 16.0%; (ii) annual revenue growth rates generally ranging from 1% to 20%; (iii) sustained or slightly increased gross margins; (iv) peer group EBITDA multiples; and (v) terminal values for each reporting unit using a long-term growth rate of 1.0% to 3.5%. If actual results differ from estimates used in these calculations, the Company could incur future impairment charges.
During the Company’s assessment of its reporting units’ fair values in relation to their respective carrying values, four reporting units had a fair value in excess of 30% of their carrying value, two reporting units had a fair value within 10% percent of their carrying value, and one had a fair value below its carrying value. The two reporting units with a fair value within 10% of their carrying value were the Europe and CRTS reporting units, which had fair values exceeding their carrying values by 9.3% and 2.5%, respectively. The one reporting unit with a fair value below its carrying value was the Fyfe reporting unit, which had a fair value less than its carrying value by 6.2%. The total value of goodwill recorded at the impairment testing date for the Europe, CRTS and Fyfe reporting units was $20.4 million, $20.1 million and $66.5 million, respectively.
For the CRTS reporting unit, excess fair value in relation to its carrying value was 2.5%. The values derived from both the income approach and the market approach decreased from the October 1, 2013 annual goodwill impairment analysis, and the fair value in relation to its carrying value declined from the prior year due to reduced longer-term outlooks for higher-margin, international offshore markets. CRTS achieved healthy project wins during 2014; however, most were situated in international onshore and mining markets, which typically offer lower margin profiles. Management expects this trend to continue into the foreseeable future. The fair value for CRTS decreased $3.8 million, or 6.8%, from the prior year analysis. The 2014 analysis assumed a weighted average cost of capital of 13.5%, compared 13.0% in 2013, and a long-term growth rate of 3.0%, which is consistent with the October 1, 2013 review. The income approach analysis also included an annual revenue growth rate of approximately 6.5%, which is higher than the prior year; however, average gross margins were approximately 150 basis points lower in 2014 due to the shift in expected project mix. See below for the trigger-based impairment review conducted as of December 31, 2014.
For the Fyfe reporting unit, fair value in relation to its carrying value was negative 6.2%. The values derived from both the income approach and the market approach decreased from the October 1, 2013 analysis, and the fair value in relation to its carrying value declined from the prior year due to lower longer-term expectations for the Fyfe businesses, primarily in North America, because recent investments in operational leadership and business development have yielded slower than expected growth. For the 2013 analysis, the Company assumed bidding activity would increase in 2014 and result in new contract wins that would commence in 2014 and 2015. While stability has been restored and improvements have been made in 2014, the ability to sustain new order intake and improve gross profits have not materialized as rapidly as expected. The fair value for Fyfe decreased $40.1 million, or 20.7%, from the prior year analysis. The impairment analysis assumed a weighted average cost of capital of 16.0% and a long-term growth rate of 3.5%. The analysis also included an annual revenue growth rate of approximately 10%, due to the low revenue levels achieved in 2014. As a result of failing Step 1, the Company performed Step 2 procedures, which compares the carrying value of goodwill to its implied fair value. In estimating the implied fair value of goodwill for a reporting unit, the Company assigns the fair value (as determined in Step 1) to the assets and liabilities associated with the reporting unit as if the reporting unit had been acquired in a business combination. Any excess of the carrying value of goodwill of the reporting unit over its implied fair value is recorded as impairment. Based on this analysis, the Company determined that recorded goodwill at Fyfe was impaired by $16.1 million, which was recorded to “Goodwill impairment” in the Consolidated Statement of Operations in the fourth quarter of 2014. As of December 31, 2014, the Company had remaining Fyfe goodwill of $50.2 million. Our future cash flows include increased revenue projections related to growth in the pipeline market, specifically industrial and municipal pipelines. Delays in our growth projections could have a material negative affect on Fyfe’s projected long-term cash flows. Also included in the projected cash flows are certain cost savings expected to be achieved through the 2014 Restructuring Plan. If any of these assumptions do not materialize in a manner consistent with the Company’s expectations, there is risk of impairment to recorded goodwill.
Impairment Review - December 31, 2014
During the fourth quarter of 2014, certain reporting units operating in the energy sector experienced customer-driven delays, work order cancellations, and canceled sales opportunities as a result of declining crude oil prices since October 2014. The Company evaluated the goodwill of its operations affected by these circumstances and determined that a triggering event had occurred. As such, the Company performed a goodwill impairment review for its Bayou and CRTS reporting units as of December 31, 2014. In accordance with the provisions of FASB ASC 350, the Company determined the fair value of its affected reporting units and compared such fair value to the carrying value of those reporting units. For both reporting units, carrying value exceeded fair value.
For the Bayou reporting unit, fair value in relation to its carrying value was negative 9.5%. The values derived from the income approach and the market approach decreased 21.3% and 12.0%, respectively, from the September 30, 2014 goodwill impairment analysis. Current uncertainty in the upstream oil markets, which caused work order cancellations and canceled sales opportunities in North America for the Bayou Canada and CCSI asset groups, affected the Company’s expected future cash flows in 2015 and 2016. The impairment analysis assumed a weighted average cost of capital of 13.5% and a long-term growth rate of 3.0%, which are both consistent with the September 30, 2014 review. The income approach analysis also included an annual revenue growth rate of approximately 4%, which was slightly lower than the 5% annual growth in the previous analysis. In addition, average gross margins were approximately 35 basis points lower in 2014 due to expected market contraction and lower plant utilization rates. As a result of failing Step 1, the Company performed Step 2 procedures, which compares the carrying value of goodwill to its implied fair value. In estimating the implied fair value of goodwill for a reporting unit, the Company assigns the fair value (as determined in Step1) to the assets and liabilities associated with the reporting unit as if the reporting unit had been acquired in a business combination. Any excess of the carrying value of goodwill of the reporting unit over its implied fair value is recorded as impairment. Based on this analysis, the Company determined that Bayou’s goodwill was fully impaired; and as such, recorded a $29.7 million charge to “Goodwill impairment” in the Consolidated Statement of Operations in 2014. As of December 31, 2014, there was no recorded goodwill at Bayou.
For the CRTS reporting unit, fair value in relation to its carrying value was negative 13.8%. The values derived from both the income approach and the market approach decreased from the October 1, 2014 annual goodwill impairment analysis due to current uncertainty in the upstream oil markets, which caused customer-driven delays in the more profitable international offshore pipeline market and delayed or canceled sales opportunities in certain North American markets. These adverse conditions affected the Company’s expected future cash flows in 2015 and 2016. The fair value for CRTS decreased $5.4 million, or 10.5%, from the previous analysis. The impairment analysis assumed a weighted average cost of capital of 13.5% and a long-term growth rate of 3.0%, which are both consistent with the October 1, 2014 review. The income approach analysis also included an annual revenue growth rate of approximately 3.8%, which is lower than the 6.5% growth rate assumed in the previous analysis. Expected gross margins were consistent between both analyses. As a result of failing Step 1, the Company performed Step 2 procedures, which compares the carrying value of goodwill to its implied fair value. In estimating the implied fair value of goodwill for a reporting unit, the Company assigns the fair value (as determined in Step 1) to the assets and liabilities associated with the reporting unit as if the reporting unit had been acquired in a business combination. Any excess of the carrying value of goodwill of the reporting unit over its implied fair value is recorded as impairment. Based on this analysis, the Company determined that recorded goodwill at CRTS was impaired by $5.7 million, which was recorded to “Goodwill impairment” in the Consolidated Statement of Operations in 2014. As of December 31, 2014, the Company had remaining CRTS goodwill of $14.4 million. Projected cash flows were based, in part, on maintaining a presence in the higher-margin. international offshore pipeline market and the Company’s ability to expand its technology to other applications. If these assumptions do not materialize in a manner consistent with Company’s expectations, there is risk of impairment to recorded goodwill.
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. The Company had previously received an indication from Stupp of its intent to exercise such option and, in the second quarter of 2013 in connection with such indication, the Company recognized a non-cash charge of $2.7 million ($1.8 million post-tax) related to the goodwill allocated to the joint venture as part of the purchase price accounting associated with the 2009 acquisition of Bayou. The non-cash charge represented the Company’s then current estimate of the difference between the carrying value of the investment on the balance sheet and the amount the Company would receive in connection with the exercise. 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 percent (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. As a result, Bayou Delta is now a wholly owned subsidiary of the Company.
In June 2013, the Company sold its fifty percent (50%) interest in Insituform-Germany to Aarsleff. Insituform-Germany, a company that was jointly owned by Aegion and Aarsleff, is active in the business of no-dig pipe rehabilitation in Germany, Slovakia and Hungary. The sale price was €14 million, approximately $18.3 million. The sale resulted in a gain on the sale of approximately $11.3 million (net of $0.5 million of transaction expenses) recorded in other income (expense) on the consolidated statement of operations. In connection with the sale, Insituform-Germany also entered into a tube supply agreement with the Company whereby Insituform-Germany will purchase on an annual basis at least GBP 2.3 million, approximately $3.6 million, of felt cured-in-place pipe (“CIPP”) liners during the two-year period from June 26, 2013 to June 30, 2015.
The Company, through its subsidiary, Insituform Technologies Netherlands BV, owns a forty-nine percent (49%) equity interest in WCU Corrosion Technologies Pte. Ltd. (“WCU”). WCU offers the Company’s Tite Liner® process in the oil and gas sector and onshore corrosion services in Asia and Australia.
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 December 31, 2014 and 2013, the investments in affiliated companies on the Company’s consolidated balance sheets were $0.0 million and $9.1 million, respectively.
Net income presented below for the years ended December 31, 2014 and 2013 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 is 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 these investments in affiliated companies at December 31, 2014 and 2013 and for each of the years in the three-year period ended December 31, 2014 are summarized in the following tables (in thousands):
	December 31,
Balance sheet data	2014(1)		2013(2)
Current assets	$	—	$	10,220
Non-current assets	—		10,022
Current liabilities	—		1,743
Non-current liabilities	—		—
Income statement data	2014(1)		2013(2)			2012(2)
Revenue	$	9,088	$	89,157		$	141,233
Gross profit	3,489		27,336			40,342
Net income	2,413		17,946			22,009
Equity in earnings of affiliated companies	570		5,159			6,359
_____________________
(1)    Bayou Coating was sold in March 2014. Income statement data in 2014 includes only those results up to the date of its sale.
(2)    Includes the financial data of Insituform-Germany through the date of its sale in June 2013.
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 December 31, 2014, the Company consolidated any VIEs in which it was the primary beneficiary. Also, as of December 31, 2014, the Company had significant interests in certain VIEs primarily through its joint venture arrangements for which the Company was not the primary beneficiary. There have been no changes in the status of the Company’s VIE or primary beneficiary designations during 2014.
Financial data for consolidated variable interest entities at December 31, 2014 and 2013 and for each of the years in the three-year period ended December 31, 2014 are summarized in the following tables (in thousands):
	December 31,
Balance sheet data	2014		2013
Current assets	$	57,046	$	55,651
Non-current assets	43,165		47,606
Current liabilities	22,525		33,886
Non-current liabilities	36,155		25,020
Income statement data	2014		2013			2012
Revenue	$	84,968	$	85,908		$	107,821
Gross profit	14,306		12,998			19,625
Net income	2,413		1,892			3,622
The Company’s non-consolidated variable interest entities are accounted for using the equity method of accounting and discussed further under “Investments in Affiliated Companies” above.
Newly Issued Accounting Pronouncements
In April 2014, the FASB issued guidance that changes the criteria for determining which disposals can be presented as discontinued operations and modifies the related disclosure requirements. Under the new guidance, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results and is disposed of or classified as held for sale. The standard also introduces several new disclosures. The guidance applies prospectively to new disposals and new classifications of disposal groups as held for sale after the effective date and is effective for annual and interim periods beginning after December 15, 2014, with earlier adoption permitted. The Company does not expect that the adoption of this standard will have a material effect on its 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 non-financial 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, 2016. The Company is currently evaluating the effect the guidance will have on its financial condition and results of operations.
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 Company is currently evaluating the effect the guidance will have on its financial condition and results of operations.

Note_3_Supplemental_Balance_Sh

Note 3 - Supplemental Balance Sheet Information	12 Months Ended
	Dec. 31, 2014
Supplemental Balance Sheet Data [Abstract]
Supplemental Balance Sheet Information [Text Block]	SUPPLEMENTAL BALANCE SHEET INFORMATION
	Allowance for Doubtful Accounts
	Activity in the allowance for doubtful accounts is summarized as follows for the years ended December 31 (in thousands):
			2014				2013				2012
	Balance, at beginning of year		$	3,441			$	2,953			$	3,077
	Bad debt expense (1)		21,911				1,043				428
	Write-offs and adjustments (1)		(6,045		)		(555		)		(552		)
	Balance, at end of year		$	19,307			$	3,441			$	2,953
	__________________________
	(1)	The Company recorded bad debt expense of $11.9 million in 2014 as part of the 2014 Restructuring Plan (see Note 3) and was primarily due to the exiting of certain low-return businesses mainly in foreign locations.
	Costs and Estimated Earnings on Uncompleted Contracts
	Costs and estimated earnings on uncompleted contracts consisted of the following at December 31 (in thousands):
		2014				2013
	Costs incurred on uncompleted contracts	$	795,139			$	740,403
	Estimated earnings to date	158,982				141,413
	Subtotal	954,121				881,816
	Less – billings to date	(903,098		)		(826,795		)
	Total	$	51,023			$	55,021
	Included in the accompanying balance sheets:
	Costs and estimated earnings in excess of billings	94,045				79,999
	Billings in excess of costs and estimated earnings	(43,022		)		(24,978		)
	Total	$	51,023			$	55,021
	Costs and estimated earnings in excess of billings represent work performed that could not be billed either due to contract stipulations or the required contractual documentation has not been finalized. Substantially all unbilled amounts are expected to be billed and collected within one year.
	Inventories
	Inventories are summarized as follows at December 31 (in thousands):
		2014				2013
	Raw materials and supplies	$	22,807			$	19,680
	Work-in-process	13,179				8,217
	Finished products	9,692				12,518
	Construction materials	13,514				18,353
	Total	$	59,192			$	58,768
	Property, Plant and Equipment
	Property, plant and equipment consisted of the following at December 31 (in thousands):
		Estimated				2014(1)				2013
		Useful Lives
		(Years)
	Land and land improvements					$	12,021			$	11,964
	Buildings and improvements	5	—	40		62,548				63,870
	Machinery and equipment	4	—	10		185,003				185,307
	Furniture and fixtures	3	—	10		27,115				25,848
	Autos and trucks	3	—	10		51,635				52,145
	Construction in progress					15,400				31,012
	Subtotal					353,722				370,146
	Less – Accumulated depreciation					(185,509		)		(187,843		)
	Total					$	168,213			$	182,303
	__________________________
	(1)	During the third quarter of 2014, the Company recorded asset impairments of $11.9 million related to the 2014 Restructuring Plan (see Notes 2 and 3).
	Depreciation expense was $30.2 million, $28.0 million and $27.1 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	Accrued Expenses
	Accrued expenses consisted of the following at December 31 (in thousands):
		2014				2013
	Vendor and other accrued expenses	$	49,499			$	51,278
	Estimated casualty and healthcare liabilities	17,780				13,775
	Job costs	13,718				13,843
	Accrued compensation	21,033				15,942
	Income tax payable and deferred income taxes	9,587				10,628
	Total	$	111,617			$	105,466

Restructuring

Restructuring	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring	RESTRUCTURING
	On October 6, 2014, the Company’s board of directors approved the 2014 Restructuring Plan to improve gross margins and profitability in the long term by exiting low-return businesses and reducing the size and cost of the Company’s overhead structure.
	The 2014 Restructuring Plan included exiting certain unprofitable international locations for the Company’s Insituform business, consolidating the Company’s worldwide Fyfe business with the Company’s global Insituform business and eliminating certain idle facilities in the Company’s Bayou Louisiana coatings operations.
	For the year ended December 31, 2014, significant progress has been made against all of the aforementioned objectives. Headcount reductions via termination totaled 31 in 2014. The Company expects approximately 80 additional headcount reductions via termination in 2015.
	In December 2014, and as part of the restructuring, the Company sold its wholly-owned subsidiary, Ka-te, to Marco Daetwyler Gruppe AG for the sale price of CHF 1.1 million (approximately $1.1 million). In connection with the sale, the Company entered in to a five-year exclusive tube supply agreement whereby Ka-te will source all of its liners from Insituform Linings Ltd. 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.
	During 2014, the Company recorded pre-tax expense of $49.5 million for charges related to the 2014 Restructuring Plan as follows (in thousands):
		Infrastructure		Corrosion		Total
		Solutions		Protection
	Severance and benefit related costs	$	687	$	—	$	687
	Bad debt expense	11,947		—		11,947
	Inventory obsolescence	2,746		—		2,746
	Fixed asset impairment	533		11,338		11,871
	Definite-lived intangible asset impairment	—		10,896		10,896
	Other asset write-offs	5,013		—		5,013
	Other restructuring costs	6,358		—		6,358
	Total pre-tax restructuring charges	$	27,284	$	22,234	$	49,518
	Restructuring costs of $0.7 million are reported on a separate line in the Consolidated Statements of Operations in accordance with FASB ASC 420, Exit or Disposal Cost Obligations, and relate to severance and other termination benefit costs. The following tables summarize all restructuring charges recognized in 2014, by reporting segment, as presented in their affected line in the Consolidated Statements of Operations:
		Fixed Asset		Definite-lived		Other		Cash		Total
		Impairment		Intangible		Non-Cash		Restructuring
				Asset		Restructuring		Charges
				Impairment		Charges
	Infrastructure Solutions:
	Cost of revenues	$	498	$	—	$	2,774	$	1,076	$	4,348
	Operating expenses	35		—		17,544		2,976		20,555
	Restructuring charges	—		—		—		687		687
	Other expense	—		—		790		904		1,694
		533		—		21,108		5,643		27,284
	Corrosion Protection:
	Cost of revenues	11,338		—		—		—		11,338
	Definite-lived intangible asset impairment	—		10,896		—		—		10,896
		11,338		10,896		—		—		22,234
	Total pre-tax restructuring charges	$	11,871	$	10,896	$	21,108	$	5,643	$	49,518
	Total pre-tax restructuring charges in 2014 were $49.5 million ($36.2 million post-tax) and consist of non-cash charges totaling $43.9 million and cash charges totaling $5.6 million. The non-cash charges of $43.9 million included $22.2 million related to the impairment of certain long-lived assets and definite-lived intangible assets for Bayou’s coating operations in Louisiana, which is reported in the Corrosion Protection reportable segment, and $21.7 million related to inventory obsolescence, impairment definite-lived intangible assets, allowances for accounts receivable, 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. Cash charges totaling $5.6 million included employee severance, retention, extension of benefits, employment assistance programs and other costs associated with the restructuring for the European and Asia-Pacific operations.
	Estimated remaining costs to be incurred in 2015, including totals and category ranges, for the 2014 Restructuring Plan are as follows:
	•	Approximately $1 million to $2 million related to severance and benefit costs,
	•	Approximately $4 million to $6 million related to other restructuring costs.
	The following table summarizes the 2014 Restructuring Plan activity during 2014 (in thousands):
				Utilized
		Charge to Income		Cash		Non-Cash		Reserves at December 31, 2014
	Severance and benefit related costs	$	687	$	221	$	—	$	466
	Bad debt expense	11,947		—		483		11,464
	Inventory obsolescence	2,746		—		2,746		—
	Fixed asset impairment	11,871		—		11,871		—
	Definite-lived intangible asset impairment	10,896		—		10,896		—
	Other asset write-offs	5,013		—		5,013		—
	Other restructuring costs	6,358		3,862		—		2,496
	Total pre-tax restructuring charges	$	49,518	$	4,083	$	31,009	$	14,426

Note_4_Goodwill_and_Intangible

Note 4 - Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets [Text Block]	GOODWILL AND INTANGIBLE ASSETS
	Goodwill
	The following table presents a reconciliation of the beginning and ending balances of the Company’s goodwill at January 1, 2014 and December 31, 2014 (in millions):
		Infrastructure				Corrosion				Energy				Total
		Solutions				Protection				Services
	Beginning balance at January 1, 2014	$	195,570			$	75,862			$	77,248			$	348,680
	Adjustments to goodwill (1)(2)	1,098				—				(1,000		)		98
	Impairments (3)	(16,069		)		(35,443		)		—				(51,512		)
	Foreign currency translation	(3,324		)		(919		)		—				(4,243		)
	Goodwill at December 31, 2014	$	177,275			$	39,500			$	76,248			$	293,023
	__________________________
	(1)	During the second quarter of 2014, the Company recorded goodwill of $1.1 million related to the 2012 acquisition of Fyfe Asia (see Note 1).
	(2)	During the fourth quarter of 2014, the Company decreased goodwill by $1.0 million related to the 2013 acquisition of Brinderson (see Note 1).
	(3)	During the fourth quarter of 2014, the Company recorded a goodwill impairment to its Fyfe reporting unit of $16.1 million, which is included in the Infrastructure Solutions reportable segment, and goodwill impairments to its Bayou and CRTS reporting units of $29.7 million and $5.7 million, respectively, which are included in the Corrosion Protection reportable segment (see Note 2).
	Intangible Assets
	Intangible assets at December 31, 2014 and 2013 were as follows (in thousands):
		31-Dec-14														31-Dec-13
		Weighted Average Useful Lives (Years)		Gross Carrying Amount				Accumulated Amortization				Net Carrying Amount				Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	License agreements	5		$	3,908			$	(3,131	)		$	777			$	3,917	$	(2,977	)	$	940
	Backlog	0		4,731				(4,731		)		—				4,745		(4,745		)	—
	Leases	12		2,067				(623		)		1,444				2,067		(477		)	1,590
	Trademarks	16		21,722				(5,199		)		16,523				21,394		(4,167		)	17,227
	Non-competes	4		1,140				(839		)		301				1,140		(753		)	387
	Customer relationships (1)(2)	13		163,386				(32,196		)		131,190				182,703		(28,287		)	154,416
	Patents and acquired technology (3)	16		54,090				(22,052		)		32,038				57,419		(22,696		)	34,723
				$	251,044			$	(68,771	)		$	182,273			$	273,385	$	(64,102	)	$	209,283
	__________________________
	(1)	During the third quarter of 2014, the Company recorded an intangible asset impairment of $10.9 million related to realignment efforts at Bayou (see Note 2).
	(2)	During the fourth quarter of 2014, the Company recorded an intangible asset impairment of $1.4 million related to Fyfe (see Note 2).
	(3)	During the fourth quarter of 2014, the Company wrote off approximately $2.7 million in patents primarily related to Europe and in connection with the 2014 Restructuring Plan (see Note 3).
	Amortization expense was $14.1 million, $12.2 million and $10.5 million for the years ended December 31, 2014, 2013 and 2012, respectively. Estimated amortization expense by year is as follows (in thousands):
	2015		$	13,443
	2016		13,454
	2017		13,399
	2018		13,320
	2019		13,149

Note_5_LongTerm_Debt_and_Credi

Note 5 - Long-Term Debt and Credit Facility	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Long-term Debt and Credit Facility [Text Block]	LONG-TERM DEBT AND CREDIT FACILITY
	Long-term debt, term note and notes payable consisted of the following at December 31 (in thousands):
			2014		2013
	Term note, current annualized rate 2.21% due July 1, 2018		$	319,375	$	341,250
	Line of credit, 2.16% in 2014 and 2.17% in 2013		45,500		35,500
	Other notes with interest rates from 3.3% to 6.5%		12,600		11,890
	Subtotal		377,475		388,640
	Less – Current maturities and notes payable		26,399		22,024
	Total		$	351,076	$	366,616
	Principal payments required to be made for each of the next five years are summarized as follows (in thousands):
	Year		Amount
	2015		$	26,399
	2016		34,932
	2017		41,784
	2018		274,360
	2019		—
	Total		$	377,475
	Financing Arrangements
	In July 2013, in connection with the Brinderson acquisition, the Company entered into a new $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 new 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: (1) to pay the $147.6 million cash purchase price for the Company’s acquisition of Brinderson, L.P., which closed on July 1, 2013; (2) to retire $232.3 million in indebtedness outstanding under the Company’s prior credit facility; and (3) 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 December 31, 2014 was approximately 2.125%.
	The Company’s indebtedness at December 31, 2014 consisted of $319.4 million outstanding from the $350.0 million term loan under the Credit Facility and $45.5 million on the line of credit under the Credit Facility. In July 2014, the Company borrowed $10.0 million on the line of credit for working capital needs. Additionally, the Company and Wasco Coatings UK Ltd. (“Wasco Energy”), a subsidiary of Wah Seong Corporation, loaned Bayou Wasco Insulation, LLC (“Bayou Wasco”), a joint venture between the Company and Wasco Energy, an aggregate of $14.0 million for the purchase of capital assets in 2012 and 2013. Additionally, during September 2014, the Company and Wasco Energy agreed to loan Bayou Wasco an additional $2.6 million for working capital needs increasing the total to $16.6 million. Of such amount, $8.1 million (representing funds loaned by Wasco Energy) was designated as third-party debt in the Company’s consolidated financial statements. In connection with the formation of Bayou Perma-Pipe Canada, Ltd. (“BPPC”), the Company and Perma-Pipe Canada, Inc. loaned BPPC an aggregate of $8.0 million for the purchase of capital assets and for operating purposes. Additionally, during January 2012, the Company and Perma-Pipe Canada, Inc. agreed to loan BPPC an additional $6.2 million for the purchase of capital assets increasing the total to $14.2 million. Of such amount, $4.3 million was designated as third-party debt in the Company’s consolidated financial statements. The Company also held $0.1 million of third party notes and bank debt at December 31, 2014.
	As of December 31, 2014, the Company had $27.3 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 $17.1 million was for letters of credit or bank guarantees of performance or payment obligations of foreign subsidiaries.
	The Company’s indebtedness at December 31, 2013 consisted of $341.3 million outstanding from the $350.0 million term loan under the Credit Facility and $35.5 million on the line of credit under the Credit Facility. Additionally, the Company and Wasco Energy loaned Bayou Wasco an aggregate of $14.0 million for the purchase of capital assets in 2012 and 2013, of which $6.9 million (representing funds loaned by Wasco Energy) was designated as third-party debt in the consolidated financial statements. In February 2014, the Company and Wasco Energy agreed to a five-year term on the funds loaned; therefore, the amounts have been reclassified to long-term debt as of December 31, 2013. In connection with the formation of BPPC, the Company and Perma-Pipe Canada, Inc. loaned BPPC an aggregate of $8.0 million for the purchase of capital assets and for operating purposes. Additionally, during January 2012, the Company and Perma-Pipe Canada, Inc. agreed to loan BPPC an additional $6.2 million for the purchase of capital assets increasing the total to $14.2 million. Of such amount, $4.9 million was designated as third-party debt in the Company’s consolidated financial statements. The Company also held $0.1 million of third party notes and bank debt at December 31, 2013.
	At December 31, 2014 and 2013, the estimated fair value of the Company’s long-term debt was approximately $377.0 million and $380.1 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 11.
	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 amortizing $175.0 million notional amount. The annualized borrowing rate of the swap at December 31, 2014 was approximately 2.21%. 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 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 Plan when calculating the Company’s compliance with the consolidated financial leverage ratio and consolidated fixed charge coverage ratio. Subject to the specifically defined terms and methods of calculation as 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 initial maximum amount was not to initially exceed 3.75 to 1.00, but decreased, as scheduled, to not more that 3.50 to 1.00 beginning with the quarter ending June 30, 2014. At December 31, 2014, the Company’s consolidated financial leverage ratio was 2.90 to 1.00 and, using the Credit Facility defined income, the Company had the capacity to borrow up to approximately $77.1 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 December 31, 2014, the Company’s fixed charge ratio was 1.54 to 1.00.
	At December 31, 2014, the Company was in compliance with all of its debt and financial covenants as required under the Credit Facility.

Note_6_Stockholders_Equity

Note 6 - Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stockholders' Equity [Text Block]	STOCKHOLDERS’ EQUITY
	Share Repurchase Plan
	In February 2014, the Company’s board of directors authorized the open market repurchase of up to $20.0 million of the Company’s common stock to be made during 2014. Once a repurchase is complete, the Company promptly retires the shares. The Company also is 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 and directors. The participants in the Company’s equity plans may surrender shares of previously issued common stock in satisfaction of tax obligations arising from the vesting of restricted stock awards under such plans, in connection with the exercise of stock option awards, and with the lapse of restricted periods of deferred stock unit 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, the shares of the Company’s common stock are surrendered in exchange for stock option exercises or the lapse of the restricted periods of deferred stock unit awards. In addition, in connection with the exercise of employee stock options, the option holder may elect a “net, net” exercise, 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 2014, the Company acquired 860,761 shares of the Company’s common stock for $20.0 million ($23.24 average price per share) through the open market repurchase program discussed above and 54,334 shares of the Company’s common stock for $1.2 million ($22.62 average price per share) in connection with the satisfaction of tax obligations in connection with the vesting of restricted stock, the exercise of stock options and distribution of deferred stock units. In addition, during 2014, the Company acquired 419,643 shares of the Company’s common stock in connection with “net, net” exercises of employee stock options for a gross value of $9.8 million ($1.4 million in cash value). Once repurchased, the Company immediately retired all such shares.
	During 2013, the Company acquired 1,102,454 shares of the Company’s common stock for $25.0 million ($22.68 average price per share) through open market repurchase programs and 115,931 shares of the Company’s common stock for $2.6 million ($22.84 average price per share) in connection with the satisfaction of tax obligations in connection with the vesting of restricted stock, the exercise of stock options and distribution of deferred stock units. Once repurchased, the Company immediately retired all such shares.
	Equity-Based Compensation Plans
	In May 2013, the Company’s stockholders approved the 2013 Employee Equity Incentive Plan (the “2013 Employee Plan”), which replaced the 2009 Employee Equity Incentive Plan (the “2009 Employee Plan”). The 2013 Employee Plan provides for equity-based compensation awards, including restricted shares of common stock, performance awards, stock options, stock units and stock appreciation rights. There are 2,895,000 shares of the Company’s common stock registered for issuance under the 2013 Employee Plan. The 2013 Employee Plan is administered by the Compensation Committee of the Board of Directors, which determines eligibility, timing, pricing, amount and other terms or conditions of awards. At December 31, 2014, there were 5,546 options and 512,630 unvested shares of restricted stock and restricted stock units outstanding under the 2013 Employee Plan.
	In April 2009, the Company’s stockholders approved the 2009 Employee Equity Incentive Plan (the “2009 Employee Plan”), which replaced the 2006 Employee Equity Incentive Plan (the “2006 Employee Plan”). At December 31, 2014, there were 293,159 options and 254,910 unvested shares of restricted stock and restricted stock units outstanding under the 2009 Employee Plan.
	At December 31, 2014, there were 204,429 options and no unvested shares of restricted stock and restricted stock units outstanding under the 2006 Employee Plan.
	In April 2011, the Company’s stockholders approved the 2011 Non-Employee Director Equity Plan (“2011 Director Plan”), which replaced the 2006 Non-Employee Director Equity Plan (“2006 Non-Employee Director Plan”). The 2011 Director Plan provides for equity-based compensation awards, including non-qualified stock options and stock units. There are 200,000 shares of the Company’s common stock registered for issuance under the 2011 Director Plan. The Board of Directors administers the Director Plan and has the authority to establish, amend and rescind any rules and regulations related to the 2011 Director Plan. At December 31, 2014, there were 116,798 deferred stock units outstanding under the 2011 Director Plan.
	The 2011 Director Plan replaced the 2006 Non-Employee Director Plan and contains substantially the same provisions as the former plan. At December 31, 2014, there were 50,098 deferred stock units outstanding under the 2006 Non-Employee Director Plan.
	The 2006 Non-Employee Director Plan replaced the 2001 Non-Employee Director Equity Plan, and contains substantially the same provisions as the former plan. At December 31, 2014, there were 54,575 deferred stock units outstanding under the 2001 Non-Employee Director Equity Plan.
	Activity and related expense associated with these plans are described in Note 8.

Note_7_Equitybased_Compensatio

Note 7 - Equity-based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-based Compensation [Text Block]	EQUITY-BASED COMPENSATION
	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.
	A summary of stock award activity during the years ended December 31, 2014, 2013 and 2012 is as follows:
		For the Years Ended December 31,
		2014							2013					2012
		Stock Awards			Weighted				Stock Awards			Weighted		Stock Awards		Weighted
					Average							Average				Average
					Award Date							Award Date				Award Date
					Fair Value							Fair Value				Fair Value
	Outstanding, beginning of period	555,025			$	22.79			698,869			$	19.39	643,117		$	17.48
	Restricted shares awarded	242,722			23.76				435,025			24.09		239,523		18.07
	Restricted stock units awarded	395,352			21.75				112,401			25.11		222,379		18.11
	Restricted shares distributed	(118,828	)		23.55				(274,784	)		19.04		(289,001	)	13.42
	Restricted stock units distributed	(15,277	)		21.25				(13,761	)		18.87		(15,177	)	14.32
	Restricted shares forfeited	(104,013	)		23.77				(236,388	)		23.1		(36,325	)	20.13
	Restricted stock units forfeited	(187,441	)		24.48				(166,337	)		19.55		(65,647	)	18.18
	Outstanding, end of period	767,540			$	21.93			555,025			$	22.79	698,869		$	19.39
	Expense associated with stock awards was $3.6 million, $3.0 million, and $4.1 million in 2014, 2013 and 2012, respectively. Unrecognized pre-tax expense of $11.2 million related to stock awards is expected to be recognized over the weighted average remaining service period of 2.0 years for awards outstanding at December 31, 2014.
	Deferred Stock Unit Awards
	Deferred stock units generally are 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 generally are 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 information about deferred stock unit activity during the years ended December 31, 2014, 2013 and 2012:
		For the Years Ended December 31,
		2014							2013					2012
		Deferred			Weighted				Deferred			Weighted		Deferred		Weighted
		Stock			Average				Stock			Average		Stock		Average
		Units			Award				Units			Award		Units		Award
					Date							Date				Date
					Fair Value							Fair Value				Fair Value
	Outstanding, beginning of period	214,455			$	19.56			181,518			$	19.06	173,916		$	20.12
	Awarded	38,810			22.89				39,966			22.33		41,734		17.78
	Shares distributed	(31,794	)		19.7				(7,029	)		22.67		(34,132	)	22.9
	Outstanding, end of period	221,471			$	20.1			214,455			$	19.56	181,518		$	19.06
	Expense associated with awards of deferred stock units was $0.9 million, $0.9 million and $0.7 million in 2014, 2013 and 2012, 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.
	A summary of stock option activity during the years ended December 31, 2014, 2013 and 2012 is as follows:
		For the Years Ended December 31,
		2014							2013					2012
		Shares			Weighted				Shares			Weighted		Shares		Weighted
					Average							Average				Average
					Exercise							Exercise				Exercise
					Price							Price				Price
	Outstanding at January 1	1,208,824			$	18.54			1,216,809			$	18.46	1,107,712		$	18.98
	Granted	38,820			24.21				29,025			25.11		281,696		18.11
	Exercised	(526,359	)		16.36				(29,511	)		20.14		(52,676	)	16.66
	Canceled/Expired	(218,151	)		25.61				(7,499	)		24.58		(119,923	)	23.21
	Outstanding at December 31	503,134			$	18.18			1,208,824			$	18.54	1,216,809		$	18.46
	Exercisable at December 31	452,236			$	18.12			933,738			$	17.84	758,270		$	16.8
	In 2014, 2013 and 2012, the Company recorded expense of $0.6 million, $1.7 million and $2.1 million, respectively, related to stock option grants. Unrecognized pre-tax expense of $0.1 million related to stock option grants is expected to be recognized over the weighted average remaining contractual term of 1.0 years for awards outstanding at December 31, 2014.
	Financial data for stock option exercises are summarized in the following table (in thousands):
		Years Ended December 31,
		2014				2013				2012
	Amount collected from stock option exercises	$	8,614			$	738			$	1,054
	Total intrinsic value of stock option exercises	3,771				131				177
	Tax benefit (expense) of stock option exercises recorded in additional paid-in-capital	6				55				66
	Aggregate intrinsic value of outstanding stock options	1,231				5,383				5,708
	Aggregate intrinsic value of exercisable stock options	1,209				4,695				4,601
	The intrinsic value calculations are based on the Company’s closing stock price of $18.61, $21.89 and $22.19 on December 31, 2014, 2013 and 2012, respectively. At December 31, 2014, 2,048,741 and 123,853 shares of common stock were available for equity-based compensation awards pursuant to the 2013 Employee Plan and the 2011 Non-Employee Director Plan, respectively.
	The Company uses a binomial option-pricing model for valuation purposes to reflect the features of stock options granted. The fair value of stock options awarded during 2014, 2013 and 2012 was estimated at the date of grant based on the assumptions presented in the table below. 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.
		2014				2013				2012
		Range		Weighted Average		Range		Weighted Average		Range		Weighted Average
	Grant-date fair value	$11.27		$11.27		12.92		$12.92		$8.14-$8.19		$8.19
	Volatility	41.60%		41.60%		49.80%		49.80%		43.0%-45.2%		45.10%
Expected term (years)	7		7		7		7		7		7
Dividend yield	—%		—%		—%		—%		—%		—%
Risk-free rate	2.30%		2.30%		1.10%		1.10%		1.0%-1.5%		1.50%

Note_8_Taxes_on_Income_Tax_Ben

Note 8 - Taxes on Income (Tax Benefits)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Taxes on Income (Tax Benefits) [Text Block]	TAXES ON INCOME (TAX BENEFITS)
	Income (loss) from continuing operations before taxes on income (tax benefits) was as follows for the years ended December 31 (in thousands):
		2014			2013			2012
	Domestic	$	(75,112	)	$	23,695		$	45,290
	Foreign	39,137			35,307			25,576
	Total	$	(35,975	)	$	59,002		$	70,866
	Provisions (benefits) for taxes on income (tax benefit) from continuing operations consisted of the following components for the years ended December 31 (in thousands):
		2014			2013			2012
	Current:
	Federal	$	(2,112	)	$	8,603		$	9,237
	Foreign	10,586			6,078			9,704
	State	2,635			527			995
	Subtotal	11,109			15,208			19,936
	Deferred:
	Federal	(18,629		)	(2,075		)	(1,817		)
	Foreign	3,034			(727		)	69
	State	646			(252		)	475
	Subtotal	(14,949		)	(3,054		)	(1,273		)
	Total tax provision	$	(3,840	)	$	12,154		$	18,663
	Income tax (benefit) expense differed from the amounts computed by applying the U.S. federal income tax rate of 35% to income (loss) before income taxes, equity in income (loss) of joint ventures and minority interests as a result of the following (in thousands):
		2014			2013			2012
	Income taxes at U.S. federal statutory tax rate	$	(12,591	)	$	20,651		$	24,803
	Increase (decrease) in taxes resulting from:
	Change in the balance of the valuation allowance for deferred tax assets allocated to foreign income tax expense	7,785			1,447			3,714
	Change in the balance of the valuation allowance for deferred tax assets allocated to state income tax expense	5,206			115			(10		)
	State income taxes, net of federal income tax benefit	(3,073		)	64			966
	Transaction costs	—			—			509
	Meals and entertainment	863			1,034			962
	Changes in taxes previously accrued	(1,932		)	(3,098		)	(2,422		)
	Foreign tax rate differences	(9,215		)	(4,892		)	(4,236		)
	Goodwill impairment	9,690			—			—
	Recognition of uncertain tax positions	(96		)	(89		)	(800		)
	Contingent consideration reversal	—			(1,461		)	(2,869		)
	Domestic Production Activities deduction	(81		)	(1,548		)	(1,440		)
	Other matters	(396		)	(69		)	(514		)
	Total tax provision	$	(3,840	)	$	12,154		$	18,663
	Effective tax rate	10.7		%	20.6		%	26.3		%
	Net deferred taxes consisted of the following at December 31 (in thousands):
		2014			2013
	Deferred income tax assets:
	Foreign tax credit carryforwards	$	1,477		$	535
	Net operating loss carryforwards	19,355			17,146
	Accrued expenses	21,378			13,517
	Other	7,207			8,158
	Total gross deferred income tax assets	49,417			39,356
	Less valuation allowance	(19,353		)	(7,797		)
	Net deferred income tax assets	30,064			31,559
	Deferred income tax liabilities:
	Property, plant and equipment	(7,499		)	(12,901		)
	Intangible assets	(22,653		)	(34,983		)
	Undistributed foreign earnings	(7,051		)	(7,051		)
	Other	(6,859		)	(7,548		)
	Total deferred income tax liabilities	(44,062		)	(62,483		)
	Net deferred income tax liabilities	$	(13,998	)	$	(30,924	)
	The Company’s tax assets and liabilities, netted by taxing location, are in the following captions in the balance sheets (in thousands):
		2014			2013
	Current deferred income tax assets, net	$	9,516		$	4,640
	Current deferred income tax liabilities, net	(3,935		)	(4,304		)
	Noncurrent deferred income tax assets, net	3,334			6,957
	Noncurrent deferred income tax liabilities, net	(22,913		)	(38,217		)
	Net deferred income tax liabilities	$	(13,998	)	$	(30,924	)
	The Company’s deferred tax assets at December 31, 2014 included $19.4 million in federal, state and foreign net operating loss (“NOL”) carryforwards. These NOLs include $10.5 million, which if not used will expire between the years 2015 and 2034, and $8.9 million that have no expiration dates. The Company also has foreign tax credit carryforwards of $1.5 million, of which $0.5 million has no expiration date.
	For financial reporting purposes, a valuation allowance of $19.4 million has been recognized to reduce the deferred tax assets related to certain federal, state and foreign net operating loss carryforwards and other assets, for which it is more likely than not that the related tax benefits will not be realized, due to uncertainties as to the timing and amounts of future taxable income. The valuation allowance at December 31, 2013 was $7.8 million. Activity in the valuation allowance is summarized as follows for the years ended December 31 (in thousands):
		2014			2013			2012
Balance, at beginning of year	$	7,797		$	6,574		$	4,691
Additions	14,442			1,754			2,062
Reversals	(2,090		)	(131		)	(191		)
Other adjustments	(796		)	(400		)	12
Balance, at end of year	$	19,353		$	7,797		$	6,574
The Company has recorded income tax expense at U.S. tax rates on all profits, except for undistributed profits of non-U.S. subsidiaries of approximately $277.0 million, which are considered indefinitely reinvested. Determination of the amount of unrecognized deferred tax liability related to the indefinitely reinvested profits is not feasible. A deferred tax asset is recognized only if the Company has definite plans to generate a U.S. tax benefit by repatriating earnings in the foreseeable future.
FASB ASC 740, Income Taxes (“FASB ASC 740”), prescribes a more-likely-than-not threshold for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. FASC ASC 740 also provides guidance on de-recognition, classification, interest and penalties, accounting in interim periods and disclosure of uncertain tax positions in financial statements.
A reconciliation of the beginning and ending balance of unrecognized tax benefits is as follows (in thousands):
	2014			2013			2012
Balance at January 1,	$	2,936		$	3,170		$	1,050
Additions for tax positions of prior years related to acquisitions	—			—			3,145
Additions for tax positions of prior years	36			30			111
Lapse in statute of limitations	(252		)	(236		)	(1,162		)
Foreign currency translation	(48		)	(28		)	26
Balance at December 31, total tax provision	$	2,672		$	2,936		$	3,170
The total amount of unrecognized tax benefits, if recognized, that would affect the effective tax rate was $0.5 million at December 31, 2014.
The Company recognizes interest and penalties, if any, related to unrecognized tax benefits in income tax expense. During the years ended December 31, 2014, 2013 and 2012, approximately $0.3 million, $0.3 million and $0.6 million, respectively, was accrued for interest.
The Company believes that it is reasonably possible that the total amount of unrecognized tax benefits will change in 2015. The Company has certain tax return years subject to statutes of limitation that will expire within twelve months. Unless challenged by tax authorities, the expiration of those statutes of limitation is expected to result in the recognition of uncertain tax positions in the amount of approximately $0.2 million.
The Company is subject to taxation in the United States, various states and foreign jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state, local or foreign examinations by tax authorities for years before 2010.

Note_9_Commitments_and_Conting

Note 9 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies [Text Block]	COMMITMENTS AND CONTINGENCIES
	Leases
	The Company leases a number of its administrative and operations facilities under non-cancellable operating leases expiring at various dates through 2030. In addition, the Company leases certain construction, automotive and computer equipment on a multi-year, monthly or daily basis. Rental expense in the years ended December 31, 2014, 2013 and 2012 was $24.1 million, $19.5 million and $18.7 million, respectively.
	At December 31, 2014, the future minimum lease payments required under the non-cancellable operating leases were as follows (in thousands):
	Year	Minimum Lease Payments
	2015	$	17,140
	2016	13,476
	2017	8,715
	2018	5,523
	2019	3,237
	Thereafter	2,815
	Total	$	50,906
	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 where 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 as part of its purchase price accounting for Brinderson (see Note 1). The Company believes it has meritorious defenses against certain of these matters.
	Purchase Commitments
	The Company had no material purchase commitments at December 31, 2014.
	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 December 31, 2014 on its consolidated balance sheet.
	Retirement Plans
	Substantially all of the Company’s U.S. employees are eligible to participate in one of the Company’s sponsored defined contribution savings plans, which are qualified plans under the requirements of Section 401(k) of the Internal Revenue Code. Company contributions to the domestic plans were $5.3 million, $4.5 million and $3.7 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	Certain foreign subsidiaries maintain various other defined contribution retirement plans. Company contributions to such plans for the years ended December 31, 2014, 2013 and 2012 were $1.2 million, $1.2 million and $1.4 million, respectively.
	In connection with the Company’s 2009 acquisition of Corrpro, the Company assumed an obligation associated with a contributory defined benefit pension plan sponsored by a subsidiary of Corrpro located in the United Kingdom. Employees of this Corrpro subsidiary no longer accrue benefits under the plan; however, Corrpro continues to be obligated to fund prior period benefits. Corrpro funds the plan in accordance with recommendations from an independent actuary and made contributions of $0.2 million and $0.3 million in 2014 and 2013, respectively. Both the pension expense and funding requirements for the years ended December 31, 2014 and 2013 were immaterial to the Company’s consolidated financial position and results of operations. The benefit obligation and plan assets at December 31, 2014 approximated $8.6 million and $10.1 million, respectively. The Company used a discount rate of 3.4% for the evaluation of the pension liability. The Company has recorded an asset associated with the overfunded status of this plan of approximately $1.5 million, which is included in other long-term assets on the consolidated balance sheet. The benefit obligation and plan assets at December 31, 2013 approximated $7.9 million and $9.6 million, respectively. Plan assets consist of investments in equity and debt securities as well as cash, which are primarily Level 2 investments under the fair value hierarchy of U.S. GAAP.

Note_10_Derivative_Financial_I

Note 10 - Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments [Text Block]	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, 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 years ended December 31, 2014, 2013 and 2012, 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 December 31, 2014, the Company recorded a net deferred gain of less than $0.1 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 with, and receives royalty payments from its wholly-owned Canadian entities, paid in Canadian Dollars, rather than the Company’s functional currency, U.S. Dollars. In order to reduce the uncertainty of the U.S. Dollar settlement amount of that anticipated future payment from the Canadian entities, the Company uses forward contracts to sell a portion of the anticipated Canadian Dollars to be received at the future date and buys U.S. Dollars.
	In July 2013, the Company replaced its interest rate swap agreement with a notional amount of $83.0 million with an interest rate swap agreement with a notional amount of $175.0 million, which 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 amortizing $175.0 million notional amount. The annualized borrowing rate of the swap at December 31, 2014 was approximately 2.21%. 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 (as defined below) inputs (in thousands):
	Designation of Derivatives		Balance Sheet Location		31-Dec-14				31-Dec-13
	Derivatives Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	26			$	24
			Total Assets		$	26			$	24
	Forward Currency Contracts		Accrued expenses						$	—
	Interest Rate Swaps		Other non-current liabilities		729				1,220
			Total Liabilities		$	729			$	1,220
	Derivatives Not Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	62			$	752
			Total Assets		$	62			$	752
	Forward Currency Contracts		Accrued Expenses		$	—			$	—
			Total Derivative Assets		$	88			$	776
			Total Derivative Liabilities		729				1,220
			Total Net Derivative Asset (Liability)		$	(641	)		$	(444	)
	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 (in thousands):
		Total Fair Value at				Quoted Prices in Active Markets for Identical Assets				Significant Observable Inputs		Significant Unobservable Inputs
		31-Dec-14				(Level 1)				(Level 2)		(Level 3)
	Assets:
	Forward Currency Contracts	$	88			$	—			$	88	$	—
	Total	$	88			$	—			$	88	$	—
	Liabilities:
	Interest Rate Swap	$	729			$	—			729		$	—
	Total	$	729			$	—			$	729	$	—
		Total Fair Value at				Quoted Prices in Active Markets for Identical Assets				Significant Observable Inputs		Significant Unobservable Inputs
		31-Dec-13				(Level 1)				(Level 2)		(Level 3)
	Liabilities:
	Forward Currency Contracts	$	—			$	—			$	—	$	—
	Interest Rate Swap	1,220				—				1,220		—
	Total	$	1,220			$	—			$	1,220	$	—
	The following table summarizes the Company’s derivative positions at December 31, 2014:
		Position		Notional				Weighted		Average
				Amount				Average		Exchange
								Remaining		Rate
								Maturity
								In Years
	Australian Dollar/USD	Sell		$	3,221,784			0.5		0.82
	USD/British Pound	Sell		£	3,050,450			0.5		1.56
	EURO/British Pound	Sell		£	10,245,902			0.5		0.78
	Interest Rate Swap			$	159,687,500			1.6
	The Company had no transfers between Level 1, 2 or 3 inputs during 2014. Certain financial instruments are required to be recorded at fair value. Changes in assumptions or estimation methods could affect the fair value estimates; however, the Company does 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.

Note_11_Discontinued_Operation

Note 11 - Discontinued Operations	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations [Text Block]	DISCONTINUED OPERATIONS
	During the second quarter of 2013, the Company’s Board of Directors approved a plan of liquidation for its 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 New Iberia, Louisiana.
	BWW ceased bidding new work and substantially completed all ongoing projects during the second quarter of 2013. As a result of the closure of BWW, Aegion recognized a pre-tax, non-cash charge of approximately $3.9 million ($2.4 million after-tax, or $0.06 per diluted share) to reflect the impairment of goodwill and intangible assets. The Company also recognized additional non-cash impairment charges for equipment and other assets of approximately $1.1 million on a pre-tax basis ($0.7 million on an after-tax basis, or $0.02 per diluted share), which also was recorded in the second quarter of 2013. The Company also incurred cash charges to exit the business of approximately $0.1 million on a pre-tax and post-tax basis, which included property, equipment and vehicle lease termination and buyout costs, employee termination benefits and retention incentives, among other ancillary shut-down expenses. During the fourth quarter of 2014, the Company completed final liquidation of BWW. Included within the final liquidation was the settlement of outstanding receivables with a single customer associated with a larger fabrication project. The Company also incurred cash charges of $1.4 million related to certain professional fees incurred during dissolution as well as in connection with the settlement discussed above. This resulted in a recorded pre-tax charge of approximately $6.0 million within discontinued operations.
	The discontinuation of BWW signified a triggering event for the Bayou reporting unit goodwill. The Company updated its analysis of the Bayou reporting unit as of the date of discontinuation. In its previous Bayou reporting unit analysis on October 1, 2012, the Company tested the Bayou reporting unit as a whole, which included the carrying value and future cash flows associated with the BWW business. In the updated analysis associated with this triggering event, the Company removed any carrying value associated with BWW (as it was tested separately) and updated its income projections to reflect the removal of BWW and the current future cash flows of the Bayou reporting unit. Additionally, the Company updated the data points associated with the market approach. In this analysis, it was determined that the Bayou reporting unit did not result in an impairment at the date of discontinuation.
	Operating results for discontinued operations are summarized as follows for the years ended December 31 (in thousands):
		2014			2013			2012
	Revenues	$	—		$	9,763		$	11,132
	Gross profit (loss)	(67		)	(4,255		)	(645		)
	Operating expenses	(5,941		)	1,973			2,038
	Closure charges of welding business	—			5,019			—
	Operating income (loss)	(6,008		)	(11,247		)	2,683
	Other income (expense)	(74		)	—			—
	Loss before tax benefits	(6,082		)	(10,731		)	(2,904		)
	Tax benefits	2,235			4,270			1,191
	Net loss	(3,847		)	(6,461		)	(1,713		)
	Balance sheet data for discontinued operations was as follows at December 31 (in thousands):
		2014			2013
	Restricted cash	$	—		$	1,193
	Receivables, net	—			4,038
	Prepaid expenses and other current assets	—			204
	Property, plant and equipment, less accumulated depreciation	—			1,118
	Deferred tax assets	—			1,803
	Total assets	$	—		$	8,356
	Accounts payable	$	—		$	2,050
	Accrued expenses	—			20
	Deferred tax liabilities	—			197
	Total liabilities	$	—		$	2,267

Note_12_Segment_and_Geographic

Note 12 - Segment and Geographic Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	SEGMENT AND GEOGRAPHIC INFORMATION
	The Company operates in three distinct markets: energy and mining; water and wastewater; and commercial and structural services. 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 new operating segment has a president who reports to the chief operating decision manager (“CODM”). The operating results and financial information reported by each of the new segments are evaluated separately, regularly reviewed and used by the CODM to evaluate segment performance, allocate resources and determine management incentive compensation. The realignment did not change the composition of the Company’s reporting units for goodwill impairment testing purposes. The current and all future SEC filings will reflect these new reportable segments, unless and until such time as there is a subsequent change in the Company’s reportable segments.
	The year ended December 31, 2014 results include $51.5 million of goodwill impairment charges (see Note 2), $12.1 million of definite-lived intangible asset impairment charges (see Note 2) and $0.7 million for restructuring charges (see Note 3). The Company recorded these charges under “Goodwill impairment”, “Definite-lived intangible asset impairment” and “Restructuring charges”, respectively, on its Consolidated Statements of Operations. Additionally, the year ended December 31, 2014 results include $1.4 million for costs incurred related to the Company’s acquisition of Brinderson, Fyfe Asia and other acquisition targets. The year ended December 31, 2013 results include $5.8 million for costs incurred related to the acquisition of Brinderson and other acquisition targets. The year ended December 31, 2012 results include $3.1 million for costs incurred related to the acquisitions of Fyfe LA and Fyfe Asia and other acquisition targets. The Company recorded these costs under “Acquisition-related expenses” on its Consolidated Statements of Operations.
	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):
		2014			2013		2012
	Revenues:
	Infrastructure Solutions	$	567,205		$	529,301	$	502,856
	Corrosion Protection	458,409			453,886		513,975
	Energy Services	305,807			108,233		—
	Total revenues	$	1,331,421		$	1,091,420	$	1,016,831
	Operating income (loss):
	Infrastructure Solutions	$	(6,194	)	$	28,487	$	21,809
	Corrosion Protection	(31,010		)	37,253		59,994
	Energy Services	17,392			1,142		—
	Total operating income (loss)	$	(19,812	)	$	66,882	$	81,803
	Total assets:
	Infrastructure Solutions	$	485,785		$	514,778	$	531,124
	Corrosion Protection	506,659			547,280		569,109
	Energy Services	197,858			190,688		—
	Corporate	105,371			116,316		101,851
	Discontinued Operations	—			8,356		15,810
	Total assets	$	1,295,673		$	1,377,418	$	1,217,894
	Capital expenditures:
	Infrastructure Solutions	$	13,096		$	8,828	$	7,848
	Corrosion Protection	12,107			14,399		34,796
	Energy Services	3,720			968		—
	Corporate	3,976			1,890		2,094
	Total capital expenditures	$	32,899		$	26,085	$	44,738
	Depreciation and amortization:
	Infrastructure Solutions	$	15,726		$	16,552	$	17,800
	Corrosion Protection	19,259			18,736		18,175
	Energy Services	7,004			3,218		—
	Corporate	2,323			1,823		1,683
	Total depreciation and amortization	$	44,312		$	40,329	$	37,658
	The following table summarizes revenues, gross profit and operating income (loss) by geographic region (in thousands):
		2014			2013		2012
	Revenues: (1)
	United States	$	926,834		$	672,192	$	589,027
	Canada	202,806			179,236		180,283
	Europe	85,614			90,646		86,883
	Other foreign	116,167			149,346		160,638
	Total revenues	$	1,331,421		$	1,091,420	$	1,016,831
	Operating income (loss):
	United States	$	(45,945	)	$	24,977	$	40,676
	Canada	36,883			28,955		31,376
	Europe	1,862			6,276		6,196
	Other foreign	(12,612		)	6,674		3,555
	Total operating income	$	(19,812	)	$	66,882	$	81,803
	Long-lived assets: (1)(2)
	United States	$	135,898		$	154,367	$	151,337
	Canada	25,610			28,539		28,724
	Europe	8,984			10,007		16,396
	Other foreign	8,429			12,806		14,040
	Total long-lived assets	$	178,921		$	205,719	$	210,497
	__________________________
	(1)	Revenues and long-lived assets 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.
	(2)	Long-lived assets as of December 31, 2014, 2013 and 2012 do not include intangible assets, goodwill or deferred tax assets.

Note_13_Selected_Quarterly_Dat

Note 13 - Selected Quarterly Data	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information [Text Block]	SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
	Unaudited quarterly financial data was as follows for the years ended December 31, 2014 and 2013 (in thousands, except per share data):
		First				Second				Third				Fourth
		Quarter				Quarter				Quarter(1)				Quarter(2)
	Year ended December 31, 2014:
	Revenues	$	306,234			$	322,868			$	350,138			$	352,181
	Gross profit	61,063				71,918				63,939				83,063
	Operating income (loss)	9,134				20,619				(13,934		)		(35,631		)
	Income (loss) from continuing operations	4,560				12,776				(16,101		)		(32,800		)
	Loss from discontinued operations	(132		)		(364		)		(130		)		(3,221		)
	Net income (loss)	4,428				12,412				(16,231		)		(36,021		)
	Basic earnings per share:
	Income (loss) from continuing operations	$	0.12			$	0.34			$	(0.45	)		$	(0.90	)
	Loss from discontinued operations	—				(0.01		)		—				(0.09		)
	Net income (loss)	$	0.12			$	0.33			$	(0.45	)		$	(0.99	)
	Diluted earnings per share
	Income (loss) from continuing operations	$	0.12			$	0.33			$	(0.45	)		$	(0.90	)
	Loss from discontinued operations	—				(0.01		)		—				(0.09		)
	Net income (loss)	$	0.12			$	0.32			$	(0.45	)		$	(0.99	)
	____________________
	(1)	Includes expenses of $40.0 million related to our 2014 Restructuring Plan (see Note 3).
	(2)	Includes expenses of $9.5 million related to our 2014 Restructuring Plan and $52.7 million related to certain goodwill and definite-lived intangible asset impairments (see Notes 2, 3 and 5).
			First				Second				Third				Fourth
			Quarter				Quarter				Quarter(3)				Quarter(3)
	Year ended December 31, 2013:
	Revenues		$	225,976			$	242,100			$	307,665			$	315,679
	Gross profit		48,137				58,568				69,411				70,905
	Operating income		6,818				15,823				22,032				22,209
	Income from continuing operations		4,258				18,396				14,623				14,730
	Loss from discontinued operations		(921		)		(4,977		)		(558		)		(5		)
	Net income		3,337				13,419				14,065				14,725
	Basic earnings per share:
	Income from continuing operations		$	0.09			$	0.47			$	0.37			$	0.38
	Loss from discontinued operations		(0.02		)		(0.13		)		(0.01		)		—
	Net income		$	0.07			$	0.34			$	0.36			$	0.38
	Diluted earnings per share
	Income from continuing operations		$	0.09			$	0.47			$	0.37			$	0.37
	Loss from discontinued operations		(0.02		)		(0.13		)		(0.01		)		—
	Net income		$	0.07			$	0.34			$	0.36			$	0.37
	____________________
	(3)

Note_2_Accounting_Policies_Pol

Note 2 - Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries and majority-owned subsidiaries in which the Company is deemed to be the primary beneficiary. All significant intercompany transactions and balances have been eliminated. Additionally, certain prior year amounts have been reclassified to conform to the current year presentation.
Use of Estimates, Policy [Policy Text Block]	Accounting Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	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 the third and fourth quarters of 2014, 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 December 31, 2014 and 2013, the Company had $(23.4) million and $0.6 million, respectively, related to currency translation adjustments, $(0.7) million and $1.2 million, respectively, related to derivative transactions and $(0.5) million and $0.2 million, respectively, related to pension activity in accumulated other comprehensive income.
Research and Development Expense, Policy [Policy Text Block]	Research and Development
	The Company expenses research and development costs as incurred. Research and development costs of $2.6 million, $2.6 million and $1.8 million for the years ended December 31, 2014, 2013 and 2012, respectively, are included in operating expenses in the accompanying consolidated statements of income.
Income Tax, Policy [Policy Text Block]	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 9 for additional information regarding taxes on income.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Equity-Based Compensation
	The Company records expense for equity-based compensation awards, including restricted shares of common stock, performance awards, stock options and stock units based on the fair value recognition provisions contained in FASB ASC 718, Compensation – Stock Compensation (“FASB ASC 718”). The Company records the expense using a straight-line basis over the vesting period of the award. Fair value of stock option awards is determined using an option pricing model. Assumptions regarding volatility, expected term, dividend yield and risk-free rate are required for valuation of stock option awards. Volatility and expected term assumptions are based on the Company’s historical experience. The risk-free rate is based on a U.S. Treasury note with a maturity similar to the option award’s expected term. Fair value of restricted stock, restricted stock unit and deferred stock unit awards is determined using the Company’s closing stock price on the award date. The shares of restricted stock and restricted stock units that are awarded are subject to performance and/or service restrictions. The Company makes forfeiture rate assumptions in connection with the valuation of restricted stock and restricted stock unit awards that could be different than actual experience. During 2012, the Company introduced three-year performance based stock unit awards for a number of its key employees. These awards are subject to performance and service restrictions. The awards contain financial targets for each year in the three-year performance period as well as cumulative totals. These awards have a threshold, target and maximum amount of shares that can be awarded based on the Company’s financial results for each year and cumulative three-year period. The awards allow an employee to earn back a portion of the shares that were unearned in a prior year, if cumulative performance targets are met. Discussion of the Company’s application of FASB ASC 718 is described in Note 8.
Revenue Recognition, Policy [Policy Text Block]	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 Brinderson 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. Brinderson enters into contracts with its customers 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. Brinderson also performs 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.
Earnings Per Share, Policy [Policy Text Block]	Earnings per Share
	Earnings per share have been calculated using the following share information:
			2014	2013		2012
	Weighted average number of common shares used for basic EPS		37,651,492	38,692,658		39,222,737
	Effect of dilutive stock options and restricted and deferred stock unit awards		—	389,684		313,654
	Weighted average number of common shares and dilutive potential common stock used in dilutive EPS		37,651,492	39,082,342		39,536,391
	The Company excluded 318,059 stock options and restricted and deferred stock units in 2014 from the diluted earnings per share calculation for the Company’s common stock because of the reported net loss for the period. The Company excluded 164,014, 318,026 and 223,536 stock options in 2014, 2013 and 2012, 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.
Classification of Current Assets and Current Liabilities [Policy Text Block]	Classification of Current Assets and Current Liabilities
	The Company includes in current assets and current liabilities certain amounts realizable and payable under construction contracts that may extend beyond one year. The construction periods on projects undertaken by the Company generally range from less than one month to 24 months.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash, Cash Equivalents and Restricted Cash
	The Company classifies highly liquid investments with original maturities of 90 days or less as cash equivalents. Recorded book values are reasonable estimates of fair value for cash and cash equivalents. Restricted cash primarily consists of funds reserved for legal requirements, payments from certain customers placed in escrow in lieu of retention in case of potential issues regarding future job performance by the Company, or advance customer payments and compensating balances for bank undertakings in Europe. Restricted cash related to operations is similar to retainage and is therefore classified as a current asset, consistent with the Company’s policy on retainage.
Inventory, Policy [Policy Text Block]	Inventories
	Inventories are stated at the lower of cost (first-in, first-out) or market. Actual cost is used to value raw materials and supplies. Standard cost, which approximates actual cost, is used to value work-in-process, finished goods and construction materials. Standard cost includes direct labor, raw materials and manufacturing overhead based on normal capacity. For certain businesses within our Corrosion Protection segment, the Company uses actual costs or average costs for all classes of inventory.
Retainage [Policy Text Block]	Retainage
	Many of the contracts under which the Company performs work contain retainage provisions. Retainage refers to that portion of revenue earned by the Company but held for payment by the customer pending satisfactory completion of the project. The Company generally invoices its customers periodically as work is completed. Under ordinary circumstances, collection from municipalities is made within 60 to 90 days of billing. In most cases, 5% to 15% of the contract value is withheld by the municipal owner pending satisfactory completion of the project. Collections from other customers are generally made within 30 to 45 days of billing. Unless reserved, the Company believes that all amounts retained by customers under such provisions are fully collectible. Retainage on active contracts is classified as a current asset regardless of the term of the contract. Retainage is generally collected within one year of the completion of a contract, although collection can extend beyond one year from time to time. As of December 31, 2014, retainage receivables aged greater than 365 days approximated 10% of the total retainage balance and collectibility was assessed as described in the allowance for doubtful accounts section below.
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]	Allowance for Doubtful Accounts
	Management makes estimates of the uncollectibility of accounts receivable and retainage. The Company records an allowance based on specific accounts to reduce receivables, including retainage, to the amount that is expected to be collected. The specific allowances are reevaluated and adjusted as additional information is received. After all reasonable attempts to collect the receivable or retainage have been explored, the account is written off against the allowance.
Property, Plant and Equipment, Policy [Policy Text Block]	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 and Intangible Assets, Goodwill, Policy [Policy Text Block]	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 segment 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 segment’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.
	Impairment Review - September 30, 2014
	As a result of the 2014 Restructuring Plan, the Company evaluated the goodwill of its global operations affected by the restructuring initiative and determined that a triggering event had occurred. As such, the Company performed a goodwill impairment review for each affected reporting unit as of September 30, 2014. The Company’s reporting units adversely affected by the 2014 Restructuring Plan were Bayou, Europe and Asia-Pacific. In accordance with the provisions of FASB ASC 350, the Company determined the fair value of its reporting units and compared such fair value to the carrying value of those reporting units. For all three reporting units, fair value exceeded carrying value, and as such, no impairment to recorded goodwill was required.
	Significant assumptions used in the Company’s goodwill review included: (i) discount rates ranging from 13.0% to 16.5%; (ii) annual revenue growth rates generally ranging from 2% to 7%; (iii) sustained or slightly increased gross margins; (iv) peer group EBITDA multiples; and (v) terminal values for each reporting unit using a long-term growth rate of 2.5% to 3.0%. If actual results differ from estimates used in these calculations, the Company could incur future impairment charges.
	For the Bayou reporting unit, the excess of fair value in relation to its carrying value was 10.2%. The values derived from both the income approach and market approach decreased from the October 1, 2013 analysis; however, the fair value in relation to its carrying value improved from the prior year due to a decrease in carrying value as of the valuation dates. During the first nine months of 2014, the carrying value of the Bayou reporting unit was lowered due to the sale of its interest in Bayou Coating as described in Note 1 and the impairment of tangible and intangibles assets described above. The fair value for the Bayou reporting unit decreased $48.0 million, or 30.9%, from the prior year analysis due to the suspension of a material contract, a lack of project activity available in the Gulf of Mexico market and customer-driven project delays. The impairment analysis assumed a weighted average cost of capital of 13.5% and a long-term growth rate of 3%. The analysis also included an annual revenue growth rate of approximately 5% which was modestly higher than the prior year actual results, but at a level that is below the reporting unit’s five-year average. Projected cash flows anticipate a modest recovery in the Gulf of Mexico market beginning in 2015. The Company noted improved visibility into larger bidding opportunities for deep water drilling activities in the Gulf of Mexico; however, there is a significant lead time from drilling to the point of building the pipeline infrastructure, or gather lines, to bring oil and natural gas onshore for refinement. This extended lead time creates added uncertainty and could have a material negative impact on long-term projected cash flows. Additionally, projected cash flows related to the Bayou reporting unit’s new insulation facility located in Louisiana are subject to final operational testing and largely dependent in 2015 and 2016 on a single, large customer with whom the Company has a long-standing history. The Bayou reporting unit’s Canadian coating operation, while not as reliant on larger projects, is dependent upon overall increased project activity in order to realize the cash flow projections included in the impairment analysis. If any of these assumptions do not materialize in a manner consistent with the Company’s expectations, there is risk of impairment to recorded goodwill.
	For the Europe reporting unit, the excess of fair value in relation to its carrying value was 9.3%. The values derived from both the income approach and market approach decreased from the October 1, 2013 analysis, and the fair value in relation to its carrying value declined from the prior year due to exiting certain European operations. The fair value for Europe decreased $8.2 million, or 9.5%, from the prior year analysis. The impairment analysis assumed a weighted average cost of capital of 14.0% and a long-term growth rate of 2.5%. The analysis also included an annual revenue growth rate of approximately 5% which is slightly below the prior year results and certain cost savings expected to be achieved through the 2014 Restructuring Plan. In addition, projected cash flows were also based, in part, on the successful closure or sale of the Insituform contacting operations in France and Switzerland. In December 2014, the Company sold the Switzerland operations. If any of these assumptions do not materialize in a manner consistent with the Company’s expectations, there is risk of impairment to recorded goodwill.
	For the Asia-Pacific reporting unit, the excess of fair value in relation to its carrying value was 12.1%. The values derived from both the income approach and market approach decreased from the October 1, 2013 analysis, and the fair value in relation to its carrying value declined from the prior year due to exiting certain Asia-Pacific operations, many of which were underperforming. The fair value for Asia-Pacific decreased $18.0 million, or 36.4%, from the prior year analysis. The impairment analysis assumed a weighted average cost of capital of 14.0% and a long-term growth rate of 3.0%. The analysis also included an annual revenue growth rate of approximately 5% for the remaining operations and certain cost savings expected to be achieved through the 2014 Restructuring Plan. In addition, projected cash flows were also based, in part, on the successful closure of the Insituform contracting operations in India, Hong Kong, Malaysia and Singapore. If any of these assumptions do not materialize in a manner consistent with the Company’s expectations, there is risk of impairment to recorded goodwill.
	The total value of goodwill recorded at September 30, 2014 for the Bayou, Europe and Asia-Pacific reporting units was $29.7 million, $20.4 million and $5.3 million, respectively.
	Annual Impairment Assessment - October 1, 2014
	The Company had nine reporting units for purposes of assessing goodwill at October 1, 2014 as follows: North American Rehabilitation, Europe, Asia-Pacific, United Pipeline Systems, Bayou, Corrpro, CRTS, Brinderson and Fyfe.
	Significant assumptions used in our October 2014 goodwill review included: (i) discount rates ranging from 12.5% to 16.0%; (ii) annual revenue growth rates generally ranging from 1% to 20%; (iii) sustained or slightly increased gross margins; (iv) peer group EBITDA multiples; and (v) terminal values for each reporting unit using a long-term growth rate of 1.0% to 3.5%. If actual results differ from estimates used in these calculations, the Company could incur future impairment charges.
	During the Company’s assessment of its reporting units’ fair values in relation to their respective carrying values, four reporting units had a fair value in excess of 30% of their carrying value, two reporting units had a fair value within 10% percent of their carrying value, and one had a fair value below its carrying value. The two reporting units with a fair value within 10% of their carrying value were the Europe and CRTS reporting units, which had fair values exceeding their carrying values by 9.3% and 2.5%, respectively. The one reporting unit with a fair value below its carrying value was the Fyfe reporting unit, which had a fair value less than its carrying value by 6.2%. The total value of goodwill recorded at the impairment testing date for the Europe, CRTS and Fyfe reporting units was $20.4 million, $20.1 million and $66.5 million, respectively.
	For the CRTS reporting unit, excess fair value in relation to its carrying value was 2.5%. The values derived from both the income approach and the market approach decreased from the October 1, 2013 annual goodwill impairment analysis, and the fair value in relation to its carrying value declined from the prior year due to reduced longer-term outlooks for higher-margin, international offshore markets. CRTS achieved healthy project wins during 2014; however, most were situated in international onshore and mining markets, which typically offer lower margin profiles. Management expects this trend to continue into the foreseeable future. The fair value for CRTS decreased $3.8 million, or 6.8%, from the prior year analysis. The 2014 analysis assumed a weighted average cost of capital of 13.5%, compared 13.0% in 2013, and a long-term growth rate of 3.0%, which is consistent with the October 1, 2013 review. The income approach analysis also included an annual revenue growth rate of approximately 6.5%, which is higher than the prior year; however, average gross margins were approximately 150 basis points lower in 2014 due to the shift in expected project mix. See below for the trigger-based impairment review conducted as of December 31, 2014.
	For the Fyfe reporting unit, fair value in relation to its carrying value was negative 6.2%. The values derived from both the income approach and the market approach decreased from the October 1, 2013 analysis, and the fair value in relation to its carrying value declined from the prior year due to lower longer-term expectations for the Fyfe businesses, primarily in North America, because recent investments in operational leadership and business development have yielded slower than expected growth. For the 2013 analysis, the Company assumed bidding activity would increase in 2014 and result in new contract wins that would commence in 2014 and 2015. While stability has been restored and improvements have been made in 2014, the ability to sustain new order intake and improve gross profits have not materialized as rapidly as expected. The fair value for Fyfe decreased $40.1 million, or 20.7%, from the prior year analysis. The impairment analysis assumed a weighted average cost of capital of 16.0% and a long-term growth rate of 3.5%. The analysis also included an annual revenue growth rate of approximately 10%, due to the low revenue levels achieved in 2014. As a result of failing Step 1, the Company performed Step 2 procedures, which compares the carrying value of goodwill to its implied fair value. In estimating the implied fair value of goodwill for a reporting unit, the Company assigns the fair value (as determined in Step 1) to the assets and liabilities associated with the reporting unit as if the reporting unit had been acquired in a business combination. Any excess of the carrying value of goodwill of the reporting unit over its implied fair value is recorded as impairment. Based on this analysis, the Company determined that recorded goodwill at Fyfe was impaired by $16.1 million, which was recorded to “Goodwill impairment” in the Consolidated Statement of Operations in the fourth quarter of 2014. As of December 31, 2014, the Company had remaining Fyfe goodwill of $50.2 million. Our future cash flows include increased revenue projections related to growth in the pipeline market, specifically industrial and municipal pipelines. Delays in our growth projections could have a material negative affect on Fyfe’s projected long-term cash flows. Also included in the projected cash flows are certain cost savings expected to be achieved through the 2014 Restructuring Plan. If any of these assumptions do not materialize in a manner consistent with the Company’s expectations, there is risk of impairment to recorded goodwill.
	Impairment Review - December 31, 2014
	During the fourth quarter of 2014, certain reporting units operating in the energy sector experienced customer-driven delays, work order cancellations, and canceled sales opportunities as a result of declining crude oil prices since October 2014. The Company evaluated the goodwill of its operations affected by these circumstances and determined that a triggering event had occurred. As such, the Company performed a goodwill impairment review for its Bayou and CRTS reporting units as of December 31, 2014. In accordance with the provisions of FASB ASC 350, the Company determined the fair value of its affected reporting units and compared such fair value to the carrying value of those reporting units. For both reporting units, carrying value exceeded fair value.
	For the Bayou reporting unit, fair value in relation to its carrying value was negative 9.5%. The values derived from the income approach and the market approach decreased 21.3% and 12.0%, respectively, from the September 30, 2014 goodwill impairment analysis. Current uncertainty in the upstream oil markets, which caused work order cancellations and canceled sales opportunities in North America for the Bayou Canada and CCSI asset groups, affected the Company’s expected future cash flows in 2015 and 2016. The impairment analysis assumed a weighted average cost of capital of 13.5% and a long-term growth rate of 3.0%, which are both consistent with the September 30, 2014 review. The income approach analysis also included an annual revenue growth rate of approximately 4%, which was slightly lower than the 5% annual growth in the previous analysis. In addition, average gross margins were approximately 35 basis points lower in 2014 due to expected market contraction and lower plant utilization rates. As a result of failing Step 1, the Company performed Step 2 procedures, which compares the carrying value of goodwill to its implied fair value. In estimating the implied fair value of goodwill for a reporting unit, the Company assigns the fair value (as determined in Step1) to the assets and liabilities associated with the reporting unit as if the reporting unit had been acquired in a business combination. Any excess of the carrying value of goodwill of the reporting unit over its implied fair value is recorded as impairment. Based on this analysis, the Company determined that Bayou’s goodwill was fully impaired; and as such, recorded a $29.7 million charge to “Goodwill impairment” in the Consolidated Statement of Operations in 2014. As of December 31, 2014, there was no recorded goodwill at Bayou.
	For the CRTS reporting unit, fair value in relation to its carrying value was negative 13.8%. The values derived from both the income approach and the market approach decreased from the October 1, 2014 annual goodwill impairment analysis due to current uncertainty in the upstream oil markets, which caused customer-driven delays in the more profitable international offshore pipeline market and delayed or canceled sales opportunities in certain North American markets. These adverse conditions affected the Company’s expected future cash flows in 2015 and 2016. The fair value for CRTS decreased $5.4 million, or 10.5%, from the previous analysis. The impairment analysis assumed a weighted average cost of capital of 13.5% and a long-term growth rate of 3.0%, which are both consistent with the October 1, 2014 review. The income approach analysis also included an annual revenue growth rate of approximately 3.8%, which is lower than the 6.5% growth rate assumed in the previous analysis. Expected gross margins were consistent between both analyses. As a result of failing Step 1, the Company performed Step 2 procedures, which compares the carrying value of goodwill to its implied fair value. In estimating the implied fair value of goodwill for a reporting unit, the Company assigns the fair value (as determined in Step 1) to the assets and liabilities associated with the reporting unit as if the reporting unit had been acquired in a business combination. Any excess of the carrying value of goodwill of the reporting unit over its implied fair value is recorded as impairment. Based on this analysis, the Company determined that recorded goodwill at CRTS was impaired by $5.7 million, which was recorded to “Goodwill impairment” in the Consolidated Statement of Operations in 2014. As of December 31, 2014, the Company had remaining CRTS goodwill of $14.4 million. Projected cash flows were based, in part, on maintaining a presence in the higher-margin. international offshore pipeline market and the Company’s ability to expand its technology to other applications. If these assumptions do not materialize in a manner consistent with Company’s expectations, there is risk of impairment to recorded goodwill.
Equity Method Investments, Policy [Policy Text Block]	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. The Company had previously received an indication from Stupp of its intent to exercise such option and, in the second quarter of 2013 in connection with such indication, the Company recognized a non-cash charge of $2.7 million ($1.8 million post-tax) related to the goodwill allocated to the joint venture as part of the purchase price accounting associated with the 2009 acquisition of Bayou. The non-cash charge represented the Company’s then current estimate of the difference between the carrying value of the investment on the balance sheet and the amount the Company would receive in connection with the exercise. 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 percent (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. As a result, Bayou Delta is now a wholly owned subsidiary of the Company.
	In June 2013, the Company sold its fifty percent (50%) interest in Insituform-Germany to Aarsleff. Insituform-Germany, a company that was jointly owned by Aegion and Aarsleff, is active in the business of no-dig pipe rehabilitation in Germany, Slovakia and Hungary. The sale price was €14 million, approximately $18.3 million. The sale resulted in a gain on the sale of approximately $11.3 million (net of $0.5 million of transaction expenses) recorded in other income (expense) on the consolidated statement of operations. In connection with the sale, Insituform-Germany also entered into a tube supply agreement with the Company whereby Insituform-Germany will purchase on an annual basis at least GBP 2.3 million, approximately $3.6 million, of felt cured-in-place pipe (“CIPP”) liners during the two-year period from June 26, 2013 to June 30, 2015.
	The Company, through its subsidiary, Insituform Technologies Netherlands BV, owns a forty-nine percent (49%) equity interest in WCU Corrosion Technologies Pte. Ltd. (“WCU”). WCU offers the Company’s Tite Liner® process in the oil and gas sector and onshore corrosion services in Asia and Australia.
	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 December 31, 2014 and 2013, the investments in affiliated companies on the Company’s consolidated balance sheets were $0.0 million and $9.1 million, respectively.
	Net income presented below for the years ended December 31, 2014 and 2013 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 is 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 these investments in affiliated companies at December 31, 2014 and 2013 and for each of the years in the three-year period ended December 31, 2014 are summarized in the following tables (in thousands):
		December 31,
	Balance sheet data	2014(1)		2013(2)
	Current assets	$	—	$	10,220
	Non-current assets	—		10,022
	Current liabilities	—		1,743
	Non-current liabilities	—		—
	Income statement data	2014(1)		2013(2)			2012(2)
	Revenue	$	9,088	$	89,157		$	141,233
	Gross profit	3,489		27,336			40,342
	Net income	2,413		17,946			22,009
	Equity in earnings of affiliated companies	570		5,159			6,359
	_____________________
	(1)    Bayou Coating was sold in March 2014. Income statement data in 2014 includes only those results up to the date of its sale.
	(2)    Includes the financial data of Insituform-Germany through the date of its sale in June 2013.
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	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 December 31, 2014, the Company consolidated any VIEs in which it was the primary beneficiary. Also, as of December 31, 2014, the Company had significant interests in certain VIEs primarily through its joint venture arrangements for which the Company was not the primary beneficiary. There have been no changes in the status of the Company’s VIE or primary beneficiary designations during 2014.
	Financial data for consolidated variable interest entities at December 31, 2014 and 2013 and for each of the years in the three-year period ended December 31, 2014 are summarized in the following tables (in thousands):
		December 31,
	Balance sheet data	2014		2013
	Current assets	$	57,046	$	55,651
	Non-current assets	43,165		47,606
	Current liabilities	22,525		33,886
	Non-current liabilities	36,155		25,020
	Income statement data	2014		2013			2012
	Revenue	$	84,968	$	85,908		$	107,821
	Gross profit	14,306		12,998			19,625
	Net income	2,413		1,892			3,622
	The Company’s non-consolidated variable interest entities are accounted for using the equity method of accounting and discussed further under “Investments in Affiliated Companies” above.
New Accounting Pronouncements, Policy [Policy Text Block]	Newly Issued Accounting Pronouncements
	In April 2014, the FASB issued guidance that changes the criteria for determining which disposals can be presented as discontinued operations and modifies the related disclosure requirements. Under the new guidance, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results and is disposed of or classified as held for sale. The standard also introduces several new disclosures. The guidance applies prospectively to new disposals and new classifications of disposal groups as held for sale after the effective date and is effective for annual and interim periods beginning after December 15, 2014, with earlier adoption permitted. The Company does not expect that the adoption of this standard will have a material effect on its 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 non-financial 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, 2016. The Company is currently evaluating the effect the guidance will have on its financial condition and results of operations.
	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 Company is currently evaluating the effect the guidance will have on its financial condition and results of operations.

Note_1_Description_of_Business1

Note 1 - Description of Business (Tables)	12 Months Ended
	Dec. 31, 2013				Dec. 31, 2014
General [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table summarizes the fair value of identified assets and liabilities of the Brinderson acquisition at its acquisition date (in thousands):
		Brinderson
	Cash	$	3,842
	Receivables and cost and estimated earnings in excess of billings	28,353
	Prepaid expenses and other current assets	655
	Property, plant and equipment	6,848
	Identified intangible assets	60,210
	Other assets	1,071
	Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	(30,622		)
	Total identifiable net assets	$	70,357
	Total consideration	$	146,605
	Less: total identifiable net assets	70,357
	Goodwill at December 31, 2014	$	76,248
Pro Forma [Member]
General [Line Items]
Business Acquisition, Pro Forma Information [Table Text Block]					The following unaudited pro forma summary presents combined information of the Company as if the Brinderson acquisition had occurred at the beginning of the year preceding its acquisition (in thousands):
						2013
					Revenues	$	1,199,653
					Net income (1)	50,384
					_____________________
					(1)	Includes pro-forma adjustments for purchase price depreciation and amortization as if those intangibles were recorded as of January 1 of the year preceding the respective acquisition date.
Since Acquisition [Member]
General [Line Items]
Business Acquisition, Pro Forma Information [Table Text Block]					The Brinderson acquisition made the following contributions to the Company’s revenues and profits (in thousands):
						Years Ended December 31,
						2014		2013
					Revenues	$	305,807	$	108,233
					Net income (1)	13,310		4,838
					_____________________
					(1)	Net income includes an allocation of corporate expenses that is not necessarily an indication of the entity’s operations on a stand alone basis.
Brinderson LP [Member]
General [Line Items]
Schedule of Purchase Accounting Adjustments [Table Text Block]	The following adjustment was made during the fourth quarter of 2014 relative to the acquisition of Brinderson as the Company completed its purchase price accounting (in thousands):
		Brinderson
	Goodwill at December 31, 2013	$	77,248
	Decrease in goodwill related to working capital adjustment	(1,000		)
	Goodwill at December 31, 2014	$	76,248
Fyfe Asia [Member]
General [Line Items]
Schedule of Purchase Accounting Adjustments [Table Text Block]	for a final purchase price of $21.1 million (in thousands):
		Fyfe Asia
	Goodwill at December 31, 2013	$	20,008
	Increase in goodwill related to working capital adjustment	1,098
	Goodwill at December 31, 2014	$	21,106

Note_2_Accounting_Policies_Tab

Note 2 - Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Note 2 - Accounting Policies [Line Items]
Schedule of Weighted Average Number of Shares [Table Text Block]	Earnings per share have been calculated using the following share information:
			2014	2013		2012
	Weighted average number of common shares used for basic EPS		37,651,492	38,692,658		39,222,737
	Effect of dilutive stock options and restricted and deferred stock unit awards		—	389,684		313,654
	Weighted average number of common shares and dilutive potential common stock used in dilutive EPS		37,651,492	39,082,342		39,536,391
Balance Sheet [Member]
Note 2 - Accounting Policies [Line Items]
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]	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 these investments in affiliated companies at December 31, 2014 and 2013 and for each of the years in the three-year period ended December 31, 2014 are summarized in the following tables (in thousands):
		December 31,
	Balance sheet data	2014(1)		2013(2)
	Current assets	$	—	$	10,220
	Non-current assets	—		10,022
	Current liabilities	—		1,743
	Non-current liabilities	—		—
Schedule of Variable Interest Entities [Table Text Block]	Financial data for consolidated variable interest entities at December 31, 2014 and 2013 and for each of the years in the three-year period ended December 31, 2014 are summarized in the following tables (in thousands):
		December 31,
	Balance sheet data	2014		2013
	Current assets	$	57,046	$	55,651
	Non-current assets	43,165		47,606
	Current liabilities	22,525		33,886
	Non-current liabilities	36,155		25,020
Income Statement [Member]
Note 2 - Accounting Policies [Line Items]
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]
	Income statement data	2014(1)		2013(2)			2012(2)
	Revenue	$	9,088	$	89,157		$	141,233
	Gross profit	3,489		27,336			40,342
	Net income	2,413		17,946			22,009
	Equity in earnings of affiliated companies	570		5,159			6,359
	_____________________
	(1)    Bayou Coating was sold in March 2014.
Schedule of Variable Interest Entities [Table Text Block]
	Income statement data	2014		2013			2012
	Revenue	$	84,968	$	85,908		$	107,821
	Gross profit	14,306		12,998			19,625
	Net income	2,413		1,892			3,622

Note_3_Supplemental_Balance_Sh1

Note 3 - Supplemental Balance Sheet Information (Tables)	12 Months Ended
	Dec. 31, 2014
Supplemental Balance Sheet Data [Abstract]
Allowance for Doubtful Accounts [Table Text Block]	Activity in the allowance for doubtful accounts is summarized as follows for the years ended December 31 (in thousands):
			2014				2013				2012
	Balance, at beginning of year		$	3,441			$	2,953			$	3,077
	Bad debt expense (1)		21,911				1,043				428
	Write-offs and adjustments (1)		(6,045		)		(555		)		(552		)
	Balance, at end of year		$	19,307			$	3,441			$	2,953
	__________________________
	(1)	The Company recorded bad debt expense of $11.9 million in 2014 as part of the 2014 Restructuring Plan (see Note 3) and was primarily due to the exiting of certain low-return businesses mainly in foreign locations.
Costs in Excess of Billings and Billings in Excess of Costs [Table Text Block]	Costs and estimated earnings on uncompleted contracts consisted of the following at December 31 (in thousands):
		2014				2013
	Costs incurred on uncompleted contracts	$	795,139			$	740,403
	Estimated earnings to date	158,982				141,413
	Subtotal	954,121				881,816
	Less – billings to date	(903,098		)		(826,795		)
	Total	$	51,023			$	55,021
	Included in the accompanying balance sheets:
	Costs and estimated earnings in excess of billings	94,045				79,999
	Billings in excess of costs and estimated earnings	(43,022		)		(24,978		)
	Total	$	51,023			$	55,021
Schedule of Inventory, Current [Table Text Block]	Inventories are summarized as follows at December 31 (in thousands):
		2014				2013
	Raw materials and supplies	$	22,807			$	19,680
	Work-in-process	13,179				8,217
	Finished products	9,692				12,518
	Construction materials	13,514				18,353
	Total	$	59,192			$	58,768
Property, Plant and Equipment [Table Text Block]	Property, plant and equipment consisted of the following at December 31 (in thousands):
		Estimated				2014(1)				2013
		Useful Lives
		(Years)
	Land and land improvements					$	12,021			$	11,964
	Buildings and improvements	5	—	40		62,548				63,870
	Machinery and equipment	4	—	10		185,003				185,307
	Furniture and fixtures	3	—	10		27,115				25,848
	Autos and trucks	3	—	10		51,635				52,145
	Construction in progress					15,400				31,012
	Subtotal					353,722				370,146
	Less – Accumulated depreciation					(185,509		)		(187,843		)
	Total					$	168,213			$	182,303
	__________________________
	(1)	During the third quarter of 2014, the Company recorded asset impairments of $11.9 million related to the 2014 Restructuring Plan (see Notes 2 and 3).
Schedule of Accrued Liabilities [Table Text Block]	Accrued expenses consisted of the following at December 31 (in thousands):
		2014				2013
	Vendor and other accrued expenses	$	49,499			$	51,278
	Estimated casualty and healthcare liabilities	17,780				13,775
	Job costs	13,718				13,843
	Accrued compensation	21,033				15,942
	Income tax payable and deferred income taxes	9,587				10,628
	Total	$	111,617			$	105,466

Restructuring_Tables

Restructuring (Tables)	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost	The following tables summarize all restructuring charges recognized in 2014, by reporting segment, as presented in their affected line in the Consolidated Statements of Operations:
		Fixed Asset		Definite-lived		Other		Cash		Total
		Impairment		Intangible		Non-Cash		Restructuring
				Asset		Restructuring		Charges
				Impairment		Charges
	Infrastructure Solutions:
	Cost of revenues	$	498	$	—	$	2,774	$	1,076	$	4,348
	Operating expenses	35		—		17,544		2,976		20,555
	Restructuring charges	—		—		—		687		687
	Other expense	—		—		790		904		1,694
		533		—		21,108		5,643		27,284
	Corrosion Protection:
	Cost of revenues	11,338		—		—		—		11,338
	Definite-lived intangible asset impairment	—		10,896		—		—		10,896
		11,338		10,896		—		—		22,234
	Total pre-tax restructuring charges	$	11,871	$	10,896	$	21,108	$	5,643	$	49,518
	The following table summarizes the 2014 Restructuring Plan activity during 2014 (in thousands):
				Utilized
		Charge to Income		Cash		Non-Cash		Reserves at December 31, 2014
	Severance and benefit related costs	$	687	$	221	$	—	$	466
	Bad debt expense	11,947		—		483		11,464
	Inventory obsolescence	2,746		—		2,746		—
	Fixed asset impairment	11,871		—		11,871		—
	Definite-lived intangible asset impairment	10,896		—		10,896		—
	Other asset write-offs	5,013		—		5,013		—
	Other restructuring costs	6,358		3,862		—		2,496
	Total pre-tax restructuring charges	$	49,518	$	4,083	$	31,009	$	14,426
Restructuring and Related Costs	During 2014, the Company recorded pre-tax expense of $49.5 million for charges related to the 2014 Restructuring Plan as follows (in thousands):
		Infrastructure		Corrosion		Total
		Solutions		Protection
	Severance and benefit related costs	$	687	$	—	$	687
	Bad debt expense	11,947		—		11,947
	Inventory obsolescence	2,746		—		2,746
	Fixed asset impairment	533		11,338		11,871
	Definite-lived intangible asset impairment	—		10,896		10,896
	Other asset write-offs	5,013		—		5,013
	Other restructuring costs	6,358		—		6,358
	Total pre-tax restructuring charges	$	27,284	$	22,234	$	49,518

Note_4_Goodwill_and_Intangible1

Note 4 - Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]
		Infrastructure				Corrosion				Energy				Total
		Solutions				Protection				Services
	Beginning balance at January 1, 2014	$	195,570			$	75,862			$	77,248			$	348,680
	Adjustments to goodwill (1)(2)	1,098				—				(1,000		)		98
	Impairments (3)	(16,069		)		(35,443		)		—				(51,512		)
	Foreign currency translation	(3,324		)		(919		)		—				(4,243		)
	Goodwill at December 31, 2014	$	177,275			$	39,500			$	76,248			$	293,023
	__________________________
	(1)
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Intangible assets at December 31, 2014 and 2013 were as follows (in thousands):
		31-Dec-14														31-Dec-13
		Weighted Average Useful Lives (Years)		Gross Carrying Amount				Accumulated Amortization				Net Carrying Amount				Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	License agreements	5		$	3,908			$	(3,131	)		$	777			$	3,917	$	(2,977	)	$	940
	Backlog	0		4,731				(4,731		)		—				4,745		(4,745		)	—
	Leases	12		2,067				(623		)		1,444				2,067		(477		)	1,590
	Trademarks	16		21,722				(5,199		)		16,523				21,394		(4,167		)	17,227
	Non-competes	4		1,140				(839		)		301				1,140		(753		)	387
	Customer relationships (1)(2)	13		163,386				(32,196		)		131,190				182,703		(28,287		)	154,416
	Patents and acquired technology (3)	16		54,090				(22,052		)		32,038				57,419		(22,696		)	34,723
				$	251,044			$	(68,771	)		$	182,273			$	273,385	$	(64,102	)	$	209,283
	__________________________
	(1)	During the third quarter of 2014, the Company recorded an intangible asset impairment of $10.9 million related to realignment efforts at Bayou (see Note 2).
	(2)	During the fourth quarter of 2014, the Company recorded an intangible asset impairment of $1.4 million related to Fyfe (see Note 2).
	(3)	During the fourth quarter of 2014, the Company wrote off approximately $2.7 million in patents primarily related to Europe and in connection with the 2014 Restructuring Plan (see Note 3).
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Estimated amortization expense by year is as follows (in thousands):
	2015		$	13,443
	2016		13,454
	2017		13,399
	2018		13,320
	2019		13,149

Note_5_LongTerm_Debt_and_Credi1

Note 5 - Long-Term Debt and Credit Facility (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt, term note and notes payable consisted of the following at December 31 (in thousands):
		2014		2013
	Term note, current annualized rate 2.21% due July 1, 2018	$	319,375	$	341,250
	Line of credit, 2.16% in 2014 and 2.17% in 2013	45,500		35,500
	Other notes with interest rates from 3.3% to 6.5%	12,600		11,890
	Subtotal	377,475		388,640
	Less – Current maturities and notes payable	26,399		22,024
	Total	$	351,076	$	366,616
Schedule of Maturities of Long-term Debt [Table Text Block]	Principal payments required to be made for each of the next five years are summarized as follows (in thousands):
	Year	Amount
	2015	$	26,399
	2016	34,932
	2017	41,784
	2018	274,360
	2019	—
	Total	$	377,475

Note_7_Equitybased_Compensatio1

Note 7 - Equity-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Shareholders' Equity and Share-based Payments [Abstract]
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	A summary of stock award activity during the years ended December 31, 2014, 2013 and 2012 is as follows:
		For the Years Ended December 31,
		2014							2013					2012
		Stock Awards			Weighted				Stock Awards			Weighted		Stock Awards		Weighted
					Average							Average				Average
					Award Date							Award Date				Award Date
					Fair Value							Fair Value				Fair Value
	Outstanding, beginning of period	555,025			$	22.79			698,869			$	19.39	643,117		$	17.48
	Restricted shares awarded	242,722			23.76				435,025			24.09		239,523		18.07
	Restricted stock units awarded	395,352			21.75				112,401			25.11		222,379		18.11
	Restricted shares distributed	(118,828	)		23.55				(274,784	)		19.04		(289,001	)	13.42
	Restricted stock units distributed	(15,277	)		21.25				(13,761	)		18.87		(15,177	)	14.32
	Restricted shares forfeited	(104,013	)		23.77				(236,388	)		23.1		(36,325	)	20.13
	Restricted stock units forfeited	(187,441	)		24.48				(166,337	)		19.55		(65,647	)	18.18
	Outstanding, end of period	767,540			$	21.93			555,025			$	22.79	698,869		$	19.39
Schedule of Other Share-based Compensation, Activity [Table Text Block]	The following table summarizes information about deferred stock unit activity during the years ended December 31, 2014, 2013 and 2012:
		For the Years Ended December 31,
		2014							2013					2012
		Deferred			Weighted				Deferred			Weighted		Deferred		Weighted
		Stock			Average				Stock			Average		Stock		Average
		Units			Award				Units			Award		Units		Award
					Date							Date				Date
					Fair Value							Fair Value				Fair Value
	Outstanding, beginning of period	214,455			$	19.56			181,518			$	19.06	173,916		$	20.12
	Awarded	38,810			22.89				39,966			22.33		41,734		17.78
	Shares distributed	(31,794	)		19.7				(7,029	)		22.67		(34,132	)	22.9
	Outstanding, end of period	221,471			$	20.1			214,455			$	19.56	181,518		$	19.06
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	A summary of stock option activity during the years ended December 31, 2014, 2013 and 2012 is as follows:
		For the Years Ended December 31,
		2014							2013					2012
		Shares			Weighted				Shares			Weighted		Shares		Weighted
					Average							Average				Average
					Exercise							Exercise				Exercise
					Price							Price				Price
	Outstanding at January 1	1,208,824			$	18.54			1,216,809			$	18.46	1,107,712		$	18.98
	Granted	38,820			24.21				29,025			25.11		281,696		18.11
	Exercised	(526,359	)		16.36				(29,511	)		20.14		(52,676	)	16.66
	Canceled/Expired	(218,151	)		25.61				(7,499	)		24.58		(119,923	)	23.21
	Outstanding at December 31	503,134			$	18.18			1,208,824			$	18.54	1,216,809		$	18.46
	Exercisable at December 31	452,236			$	18.12			933,738			$	17.84	758,270		$	16.8
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]	Financial data for stock option exercises are summarized in the following table (in thousands):
		Years Ended December 31,
		2014				2013				2012
	Amount collected from stock option exercises	$	8,614			$	738			$	1,054
	Total intrinsic value of stock option exercises	3,771				131				177
	Tax benefit (expense) of stock option exercises recorded in additional paid-in-capital	6				55				66
	Aggregate intrinsic value of outstanding stock options	1,231				5,383				5,708
	Aggregate intrinsic value of exercisable stock options	1,209				4,695				4,601
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
		2014				2013				2012
		Range		Weighted Average		Range		Weighted Average		Range		Weighted Average
	Grant-date fair value	$11.27		$11.27		12.92		$12.92		$8.14-$8.19		$8.19
	Volatility	41.60%		41.60%		49.80%		49.80%		43.0%-45.2%		45.10%
	Expected term (years)	7		7		7		7		7		7
	Dividend yield	—%		—%		—%		—%		—%		—%
	Risk-free rate	2.30%		2.30%		1.10%		1.10%		1.0%-1.5%		1.50%

Note_8_Taxes_on_Income_Tax_Ben1

Note 8 - Taxes on Income (Tax Benefits) (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Income (loss) from continuing operations before taxes on income (tax benefits) was as follows for the years ended December 31 (in thousands):
		2014			2013			2012
	Domestic	$	(75,112	)	$	23,695		$	45,290
	Foreign	39,137			35,307			25,576
	Total	$	(35,975	)	$	59,002		$	70,866
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Provisions (benefits) for taxes on income (tax benefit) from continuing operations consisted of the following components for the years ended December 31 (in thousands):
		2014			2013			2012
	Current:
	Federal	$	(2,112	)	$	8,603		$	9,237
	Foreign	10,586			6,078			9,704
	State	2,635			527			995
	Subtotal	11,109			15,208			19,936
	Deferred:
	Federal	(18,629		)	(2,075		)	(1,817		)
	Foreign	3,034			(727		)	69
	State	646			(252		)	475
	Subtotal	(14,949		)	(3,054		)	(1,273		)
	Total tax provision	$	(3,840	)	$	12,154		$	18,663
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Income tax (benefit) expense differed from the amounts computed by applying the U.S. federal income tax rate of 35% to income (loss) before income taxes, equity in income (loss) of joint ventures and minority interests as a result of the following (in thousands):
		2014			2013			2012
	Income taxes at U.S. federal statutory tax rate	$	(12,591	)	$	20,651		$	24,803
	Increase (decrease) in taxes resulting from:
	Change in the balance of the valuation allowance for deferred tax assets allocated to foreign income tax expense	7,785			1,447			3,714
	Change in the balance of the valuation allowance for deferred tax assets allocated to state income tax expense	5,206			115			(10		)
	State income taxes, net of federal income tax benefit	(3,073		)	64			966
	Transaction costs	—			—			509
	Meals and entertainment	863			1,034			962
	Changes in taxes previously accrued	(1,932		)	(3,098		)	(2,422		)
	Foreign tax rate differences	(9,215		)	(4,892		)	(4,236		)
	Goodwill impairment	9,690			—			—
	Recognition of uncertain tax positions	(96		)	(89		)	(800		)
	Contingent consideration reversal	—			(1,461		)	(2,869		)
	Domestic Production Activities deduction	(81		)	(1,548		)	(1,440		)
	Other matters	(396		)	(69		)	(514		)
	Total tax provision	$	(3,840	)	$	12,154		$	18,663
	Effective tax rate	10.7		%	20.6		%	26.3		%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	The Company’s tax assets and liabilities, netted by taxing location, are in the following captions in the balance sheets (in thousands):
		2014			2013
	Current deferred income tax assets, net	$	9,516		$	4,640
	Current deferred income tax liabilities, net	(3,935		)	(4,304		)
	Noncurrent deferred income tax assets, net	3,334			6,957
	Noncurrent deferred income tax liabilities, net	(22,913		)	(38,217		)
	Net deferred income tax liabilities	$	(13,998	)	$	(30,924	)
	Net deferred taxes consisted of the following at December 31 (in thousands):
		2014			2013
	Deferred income tax assets:
	Foreign tax credit carryforwards	$	1,477		$	535
	Net operating loss carryforwards	19,355			17,146
	Accrued expenses	21,378			13,517
	Other	7,207			8,158
	Total gross deferred income tax assets	49,417			39,356
	Less valuation allowance	(19,353		)	(7,797		)
	Net deferred income tax assets	30,064			31,559
	Deferred income tax liabilities:
	Property, plant and equipment	(7,499		)	(12,901		)
	Intangible assets	(22,653		)	(34,983		)
	Undistributed foreign earnings	(7,051		)	(7,051		)
	Other	(6,859		)	(7,548		)
	Total deferred income tax liabilities	(44,062		)	(62,483		)
	Net deferred income tax liabilities	$	(13,998	)	$	(30,924	)
Summary of Valuation Allowance [Table Text Block]	Activity in the valuation allowance is summarized as follows for the years ended December 31 (in thousands):
		2014			2013			2012
	Balance, at beginning of year	$	7,797		$	6,574		$	4,691
	Additions	14,442			1,754			2,062
	Reversals	(2,090		)	(131		)	(191		)
	Other adjustments	(796		)	(400		)	12
	Balance, at end of year	$	19,353		$	7,797		$	6,574
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	A reconciliation of the beginning and ending balance of unrecognized tax benefits is as follows (in thousands):
		2014			2013			2012
	Balance at January 1,	$	2,936		$	3,170		$	1,050
	Additions for tax positions of prior years related to acquisitions	—			—			3,145
	Additions for tax positions of prior years	36			30			111
	Lapse in statute of limitations	(252		)	(236		)	(1,162		)
	Foreign currency translation	(48		)	(28		)	26
	Balance at December 31, total tax provision	$	2,672		$	2,936		$	3,170

Note_9_Commitments_and_Conting1

Note 9 - Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Lease Payments Table [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	At December 31, 2014, the future minimum lease payments required under the non-cancellable operating leases were as follows (in thousands):
	Year	Minimum Lease Payments
	2015	$	17,140
	2016	13,476
	2017	8,715
	2018	5,523
	2019	3,237
	Thereafter	2,815
	Total	$	50,906

Note_10_Derivative_Financial_I1

Note 10 - Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The following table provides a summary of the fair value amounts of our derivative instruments, all of which are Level 2 (as defined below) inputs (in thousands):
	Designation of Derivatives		Balance Sheet Location		31-Dec-14				31-Dec-13
	Derivatives Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	26			$	24
			Total Assets		$	26			$	24
	Forward Currency Contracts		Accrued expenses						$	—
	Interest Rate Swaps		Other non-current liabilities		729				1,220
			Total Liabilities		$	729			$	1,220
	Derivatives Not Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	62			$	752
			Total Assets		$	62			$	752
	Forward Currency Contracts		Accrued Expenses		$	—			$	—
			Total Derivative Assets		$	88			$	776
			Total Derivative Liabilities		729				1,220
			Total Net Derivative Asset (Liability)		$	(641	)		$	(444	)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table represents assets and liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands):
		Total Fair Value at				Quoted Prices in Active Markets for Identical Assets				Significant Observable Inputs		Significant Unobservable Inputs
		31-Dec-14				(Level 1)				(Level 2)		(Level 3)
	Assets:
	Forward Currency Contracts	$	88			$	—			$	88	$	—
	Total	$	88			$	—			$	88	$	—
	Liabilities:
	Interest Rate Swap	$	729			$	—			729		$	—
	Total	$	729			$	—			$	729	$	—
		Total Fair Value at				Quoted Prices in Active Markets for Identical Assets				Significant Observable Inputs		Significant Unobservable Inputs
		31-Dec-13				(Level 1)				(Level 2)		(Level 3)
	Liabilities:
	Forward Currency Contracts	$	—			$	—			$	—	$	—
	Interest Rate Swap	1,220				—				1,220		—
	Total	$	1,220			$	—			$	1,220	$	—
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	The following table summarizes the Company’s derivative positions at December 31, 2014:
		Position		Notional				Weighted		Average
				Amount				Average		Exchange
								Remaining		Rate
								Maturity
								In Years
	Australian Dollar/USD	Sell		$	3,221,784			0.5		0.82
	USD/British Pound	Sell		£	3,050,450			0.5		1.56
	EURO/British Pound	Sell		£	10,245,902			0.5		0.78
	Interest Rate Swap			$	159,687,500			1.6

Note_11_Discontinued_Operation1

Note 11 - Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	Operating results for discontinued operations are summarized as follows for the years ended December 31 (in thousands):
		2014			2013			2012
	Revenues	$	—		$	9,763		$	11,132
	Gross profit (loss)	(67		)	(4,255		)	(645		)
	Operating expenses	(5,941		)	1,973			2,038
	Closure charges of welding business	—			5,019			—
	Operating income (loss)	(6,008		)	(11,247		)	2,683
	Other income (expense)	(74		)	—			—
	Loss before tax benefits	(6,082		)	(10,731		)	(2,904		)
	Tax benefits	2,235			4,270			1,191
	Net loss	(3,847		)	(6,461		)	(1,713		)
	Balance sheet data for discontinued operations was as follows at December 31 (in thousands):
		2014			2013
	Restricted cash	$	—		$	1,193
	Receivables, net	—			4,038
	Prepaid expenses and other current assets	—			204
	Property, plant and equipment, less accumulated depreciation	—			1,118
	Deferred tax assets	—			1,803
	Total assets	$	—		$	8,356
	Accounts payable	$	—		$	2,050
	Accrued expenses	—			20
	Deferred tax liabilities	—			197
	Total liabilities	$	—		$	2,267

Note_12_Segment_and_Geographic1

Note 12 - Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Financial information by segment was as follows (in thousands):
		2014			2013		2012
	Revenues:
	Infrastructure Solutions	$	567,205		$	529,301	$	502,856
	Corrosion Protection	458,409			453,886		513,975
	Energy Services	305,807			108,233		—
	Total revenues	$	1,331,421		$	1,091,420	$	1,016,831
	Operating income (loss):
	Infrastructure Solutions	$	(6,194	)	$	28,487	$	21,809
	Corrosion Protection	(31,010		)	37,253		59,994
	Energy Services	17,392			1,142		—
	Total operating income (loss)	$	(19,812	)	$	66,882	$	81,803
	Total assets:
	Infrastructure Solutions	$	485,785		$	514,778	$	531,124
	Corrosion Protection	506,659			547,280		569,109
	Energy Services	197,858			190,688		—
	Corporate	105,371			116,316		101,851
	Discontinued Operations	—			8,356		15,810
	Total assets	$	1,295,673		$	1,377,418	$	1,217,894
	Capital expenditures:
	Infrastructure Solutions	$	13,096		$	8,828	$	7,848
	Corrosion Protection	12,107			14,399		34,796
	Energy Services	3,720			968		—
	Corporate	3,976			1,890		2,094
	Total capital expenditures	$	32,899		$	26,085	$	44,738
	Depreciation and amortization:
	Infrastructure Solutions	$	15,726		$	16,552	$	17,800
	Corrosion Protection	19,259			18,736		18,175
	Energy Services	7,004			3,218		—
	Corporate	2,323			1,823		1,683
	Total depreciation and amortization	$	44,312		$	40,329	$	37,658
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	The following table summarizes revenues, gross profit and operating income (loss) by geographic region (in thousands):
		2014			2013		2012
	Revenues: (1)
	United States	$	926,834		$	672,192	$	589,027
	Canada	202,806			179,236		180,283
	Europe	85,614			90,646		86,883
	Other foreign	116,167			149,346		160,638
	Total revenues	$	1,331,421		$	1,091,420	$	1,016,831
	Operating income (loss):
	United States	$	(45,945	)	$	24,977	$	40,676
	Canada	36,883			28,955		31,376
	Europe	1,862			6,276		6,196
	Other foreign	(12,612		)	6,674		3,555
	Total operating income	$	(19,812	)	$	66,882	$	81,803
	Long-lived assets: (1)(2)
	United States	$	135,898		$	154,367	$	151,337
	Canada	25,610			28,539		28,724
	Europe	8,984			10,007		16,396
	Other foreign	8,429			12,806		14,040
	Total long-lived assets	$	178,921		$	205,719	$	210,497
	__________________________
	(1)	Revenues and long-lived assets 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.
	(2)	Long-lived assets as of December 31, 2014, 2013 and 2012 do not include intangible assets, goodwill or deferred tax assets.

Note_13_Selected_Quarterly_Dat1

Note 13 - Selected Quarterly Data (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	Unaudited quarterly financial data was as follows for the years ended December 31, 2014 and 2013 (in thousands, except per share data):
		First				Second				Third				Fourth
		Quarter				Quarter				Quarter(1)				Quarter(2)
	Year ended December 31, 2014:
	Revenues	$	306,234			$	322,868			$	350,138			$	352,181
	Gross profit	61,063				71,918				63,939				83,063
	Operating income (loss)	9,134				20,619				(13,934		)		(35,631		)
	Income (loss) from continuing operations	4,560				12,776				(16,101		)		(32,800		)
	Loss from discontinued operations	(132		)		(364		)		(130		)		(3,221		)
	Net income (loss)	4,428				12,412				(16,231		)		(36,021		)
	Basic earnings per share:
	Income (loss) from continuing operations	$	0.12			$	0.34			$	(0.45	)		$	(0.90	)
	Loss from discontinued operations	—				(0.01		)		—				(0.09		)
	Net income (loss)	$	0.12			$	0.33			$	(0.45	)		$	(0.99	)
	Diluted earnings per share
	Income (loss) from continuing operations	$	0.12			$	0.33			$	(0.45	)		$	(0.90	)
	Loss from discontinued operations	—				(0.01		)		—				(0.09		)
	Net income (loss)	$	0.12			$	0.32			$	(0.45	)		$	(0.99	)
	____________________
	(1)	Includes expenses of $40.0 million related to our 2014 Restructuring Plan (see Note 3).
	(2)	Includes expenses of $9.5 million related to our 2014 Restructuring Plan and $52.7 million related to certain goodwill and definite-lived intangible asset impairments (see Notes 2, 3 and 5).
			First				Second				Third				Fourth
			Quarter				Quarter				Quarter(3)				Quarter(3)
	Year ended December 31, 2013:
	Revenues		$	225,976			$	242,100			$	307,665			$	315,679
	Gross profit		48,137				58,568				69,411				70,905
	Operating income		6,818				15,823				22,032				22,209
	Income from continuing operations		4,258				18,396				14,623				14,730
	Loss from discontinued operations		(921		)		(4,977		)		(558		)		(5		)
	Net income		3,337				13,419				14,065				14,725
	Basic earnings per share:
	Income from continuing operations		$	0.09			$	0.47			$	0.37			$	0.38
	Loss from discontinued operations		(0.02		)		(0.13		)		(0.01		)		—
	Net income		$	0.07			$	0.34			$	0.36			$	0.38
	Diluted earnings per share
	Income from continuing operations		$	0.09			$	0.47			$	0.37			$	0.37
	Loss from discontinued operations		(0.02		)		(0.13		)		(0.01		)		—
	Net income		$	0.07			$	0.34			$	0.36			$	0.37
	____________________
	(3)    Includes the financial results of Brinderson, which was acquired in July 2013 (see Note 1).

Note_1_Description_of_Business2

Note 1 - Description of Business (Details)

0 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

24 Months Ended

Jul. 01, 2013

Jun. 30, 2013

Jun. 30, 2013

Apr. 30, 2012

Sep. 30, 2014

Mar. 31, 2014

Sep. 30, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2012

Sep. 30, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2013

Jun. 30, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Jul. 02, 2013

Jul. 01, 2013

Jun. 30, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2012

Mar. 31, 2012

Sep. 30, 2014

Mar. 31, 2014

Sep. 30, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Jul. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Jun. 30, 2015

Jun. 30, 2015

USD ($)

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Goodwill and Intagible Assets [Member]

Tangible Assets [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Fyfe Asia [Member]

Fyfe Asia [Member]

Fyfe Asia [Member]

Fyfe LA [Member]

Ka-te [Member]

CRTS [Member]

CRTS [Member]

USTS [Member]

USTS [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Delta Double Jointing [Member]

Brinderson LP [Member]

2013 Credit Facility [Member]

2013 Credit Facility [Member]

Bayou Welding Works [Member]

Bayou Welding Works [Member]

Bayou Welding Works [Member]

Bayou Welding Works [Member]

Operating Expense [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

jointVenture

geographies

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Brinderson LP [Member]

USD ($)

GBP (£)

USD ($)

General [Line Items]

Number of Countries in which Entity Operates

80

Number of Continents on Which the Company Operates

6

Number of Years in Which the Company has Operated

40

Proceeds from Divestiture of Businesses

$1,123,000

$0

$0

$1,100,000

Goodwill

293,023,000

348,680,000

76,248,000

76,248,000

77,248,000

21,106,000

20,008,000

14,400,000

20,100,000

Goodwill, Acquired During Period

100,000

[1],[2]

Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net

146,600,000

146,600,000

147,600,000

147,600,000

Goodwill, Purchase Accounting Adjustments

1,000,000

-1,000,000

-1,098,000

-4,500,000

Debt Instrument, Face Amount

650,000,000

Payments for (Proceeds from) Previous Acquisition

5,500,000

Goodwill and Intangible Asset Impairment

3,900,000

Goodwill and Intangible Asset Impairment, Net of Tax

2,400,000

Impairment Effect on Earnings Per Share, after Tax (in Dollars per share)

$0.06

$0.02

Tangible Asset Impairment Charges

11,870,000

1,100,000

Tangible Asset Impairment Charges, Net of Tax

700,000

Business Exit Costs

100,000

0

5,019,000

0

Business Combination, Contingent Consideration, Amounts Paid

0

2,112,000

0

Earnout reversal

0

-4,175,000

-10,019,000

Business Combination, Contingent Consideration, Liability

0

Noncontrolling Interest, Ownership Percentage by Parent

50.00%

50.00%

50.00%

51.00%

59.00%

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

49.00%

51.00%

41.00%

Payments to Noncontrolling Interests

617,000

617,000

287,000

5,000

Proceeds from Divestiture of Interest in Joint Venture

9,065,000

9,065,000

0

0

PercentOfBookValue

49.00%

Equity Method Investment, Other than Temporary Impairment

2,700,000

EquityMethodInvestmentOtherThanTemporaryImpairmentNetOfTax

1,800,000

Total consideration recorded

18,300,000

14,000,000

18,300,000

14,000,000

146,605,000

Gain (Loss) on Disposition of Business

11,300,000

11,300,000

-516,000

0

0

Business Acquisition, Transaction Costs

500,000

500,000

500,000

Long-term Purchase Commitment, Amount (in Pounds)

3,600,000

2,300,000

NumberOfJointVentures

2

Payments to Acquire Businesses, Gross

150,000,000

40,700,000

2,300,000

150,000,000

Proceeds from line of credit

18,000,000

18,000,000

0

26,000,000

10,000,000

Payments for Previous Acquisition

1,100,000

Loss Contingency Accrual

14,500,000

Income (Loss) from Equity Method Investments

570,000

[3]

5,159,000

[4]

6,359,000

[4]

1,200,000

1,200,000

Proceeds from Equity Method Investment, Dividends or Distributions

684,000

684,000

590,000

10,691,000

11,034,000

Gain (Loss) on Sale of Equity Investments

-472,000

0

0

Disposal Group, Including Discontinued Operation, General and Administrative Expense

1,400,000

Disposal Group, Including Discontinued Operation, Operating Income (Loss)

($6,008,000)

($11,247,000)

$2,683,000

[1]

During the second quarter of 2014, the Company recorded goodwill of $1.1 million related to the 2012 acquisition of Fyfe Asia (see Note 1).

[2]

During the fourth quarter of 2014, the Company decreased goodwill by $1.0 million related to the 2013 acquisition of Brinderson (see Note 1)

[3]

Bayou Coating was sold in March 2014. Income statement data in 2014 includes only those results up to the date of its sale.

[4]

Includes the financial data of Insituform-Germany through the date of its sale in June 2013.

Note_1_Description_of_Business3

Note 1 - Description of Business (Details) - Business Acquisitions - Contributions to Revenues and Profits Since Acquisitions (Brinderson LP [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Brinderson LP [Member]
Note 1 - General - Business Acquisitions - Contributions to Revenues and Profits Since Acquisitions [Line Items]
Revenues	$305,807		$108,233
Net income	$13,310	[1]	$4,838	[1]
[1]	Net income includes an allocation of corporate expenses that is not necessarily an indication of the entity’s operations on a stand alone basis.

Note_1_Description_of_Business4

Note 1 - Description of Business (Details) - Business Acquisitions - Proforma Information (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2013
Business Acquisitions - Proforma Information [Abstract]
Revenues		[1]	$1,199,653
Net income		[1]	$50,384	[1]
[1]	Includes pro-forma adjustments for purchase price depreciation and amortization as if those intangibles were recorded as of January 1 of the year preceding the respective acquisition date.

Note_1_Description_of_Business5

Note 1 - Description of Business (Details) - Business Acquisitions - Initial Purchase Price Allocation	1 Months Ended		3 Months Ended				12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
	USD ($)	EUR (€)	USD ($)	EUR (€)	USD ($)	USD ($)	Brinderson LP [Member]	Brinderson LP [Member]	Fyfe Asia [Member]	Fyfe Asia [Member]
							USD ($)	USD ($)	USD ($)	USD ($)
Note 1 - General - Business Acquisitions - Initial Purchase Price Allocation [Line Items]
Cash							$3,842
Receivables and cost and estimated earnings in excess of billings							28,353
Prepaid expenses and other current assets							655
Property, plant and equipment							6,848
Identified intangible assets							60,210
Other assets							1,071
Accounts payable, accrued expenses and billings in excess of cost and estimated earnings							-30,622
Total consideration recorded	18,300	14,000	18,300	14,000			146,605
Total identifiable net assets							70,357
Goodwill at September 30, 2013					$293,023	$348,680	$76,248	$77,248	$21,106	$20,008

Note_1_Description_of_Business6

Note 1 - Description of Business (Details) - Business Acquisitions - Continued Purchase Price Allocation (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
FYFE Asia Adjustment - Goodwill
Goodwill				$348,680
Goodwill		293,023	293,023	348,680
Fyfe Asia [Member]
Identifiable Net Assets [Roll Forward]
Change in goodwill related to acquisitions	1,098
FYFE Asia Adjustment - Goodwill
Goodwill				20,008
Change in goodwill related to acquisitions	1,098
Goodwill		21,106	21,106	20,008
Brinderson LP [Member]
Identifiable Net Assets [Roll Forward]
Change in goodwill related to acquisitions		-1,000	1,000
Total identifiable net assets		70,357	70,357
FYFE Asia Adjustment - Goodwill
Goodwill			77,248
Change in goodwill related to acquisitions		-1,000	1,000
Goodwill		$76,248	$76,248

Note_2_Accounting_Policies_Det

Note 2 - Accounting Policies (Details)	1 Months Ended		3 Months Ended					9 Months Ended	12 Months Ended							9 Months Ended	12 Months Ended		9 Months Ended	12 Months Ended				3 Months Ended		9 Months Ended	3 Months Ended		3 Months Ended				9 Months Ended	3 Months Ended	9 Months Ended		3 Months Ended			12 Months Ended			9 Months Ended			24 Months Ended				3 Months Ended		3 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2014	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2014	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014
	USD ($)	EUR (€)	USD ($)	USD ($)	USD ($)	EUR (€)	USD ($)	USD ($)	USD ($)		USD ($)		USD ($)		USD ($)	Minimum [Member]	Minimum [Member]	Minimum [Member]	Maximum [Member]	Maximum [Member]	Maximum [Member]	Insituform Germany [Member]	WCU [Member]	Bayou [Member]	Bayou [Member]	Bayou [Member]	Fyfe LA [Member]	Delta Double Jointing [Member]	Bayou Delta [Member]	FRANCE	MALAYSIA	INDIA	Europe [Member]	CRTS [Member]	CRTS [Member]	CRTS [Member]	Bayou Coating [Member]	Bayou Coating [Member]	Bayou Coating [Member]	Bayou Coating [Member]	Bayou Coating [Member]	Bayou Coating [Member]	Asia Pacific [Member]	Fyfe [Member]	Fyfe [Member]	Scenario, Forecast [Member]	Scenario, Forecast [Member]	Fyfe Asia [Member]	Fyfe Asia [Member]	Infrastructure Solutions [Member]	Infrastructure Solutions [Member]	Infrastructure Solutions [Member]	Infrastructure Solutions [Member]
									segment															USD ($)	USD ($)	USD ($)	USD ($)		USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)		USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	GBP (£)	USD ($)	USD ($)	USD ($)	USD ($)	Fyfe Asia [Member]	Fyfe Asia [Member]
																																																				USD ($)	USD ($)
Note 2 - Accounting Policies [Line Items]
PercentOfBookValue																																						49.00%
Tangible Asset Impairment Charges			$11,870,000				$1,100,000																		$10,900,000				$400,000	$200,000	$300,000	$100,000
Weighted Average Number of Dilutive Shares Excluded									318,059
Number of Reportable Segments									3
Retainage, Percent of Contract Value Withheld																		5.00%			15.00%
Research and Development Expense											2,600,000		2,600,000		1,800,000
Fair Value Inputs, Discount Rate																13.00%	12.50%		16.50%	16.00%				13.50%		13.50%							14.00%	13.50%	13.50%	13.00%							14.00%	16.00%
Compound Annual Growth Rate Assumption																2.00%	1.00%		7.00%	20.00%				4.00%		5.00%							5.00%	3.80%	6.50%								5.00%	10.00%
Goodwill, Impairment Loss									51,512,000		0		0																					5,700,000																29,700,000		-29,700,000	16,069,000
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax			-23,400,000		600,000			-23,400,000
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax			-700,000		1,200,000			-700,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax			-500,000		200,000			-500,000
Noncontrolling Interest, Ownership Percentage by Parent	50.00%	50.00%					50.00%															50.00%						59.00%
Business Combination, Consideration Transferred	18,300,000	14,000,000			18,300,000	14,000,000
Gain (Loss) on Disposition of Business	11,300,000				11,300,000				-516,000		0		0
Business Acquisition, Transaction Costs	500,000				500,000		500,000
Long-term Purchase Commitment, Amount (in Pounds)																																														3,600,000	2,300,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners																							49.00%					41.00%										51.00%
Payments to Noncontrolling Interests				617,000					617,000		287,000		5,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures									0		9,101,000
Fair Value Inputs, Long-term Revenue Growth Rate																2.50%	1.00%		3.00%	3.50%				3.00%		3.00%							2.50%	3.00%	3.00%								3.00%	4.00%
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount																								9.50%	10.20%	10.20%							9.30%	13.80%	2.50%								12.10%	6.20%
Reporting Unit, Change in Fair Value, Value																								0		-48,000,000							-8,200,000	5,400,000	3,800,000								-18,000,000	40,100,000
Reporting Unit, Change in Fair Value, Percent																										-30.90%							-9.50%	10.50%	6.80%								-36.40%	20.70%
Goodwill									293,023,000		348,680,000													0	29,700,000	29,700,000							20,400,000	14,400,000	20,100,000								5,300,000	66,500,000	50,200,000			21,106,000	20,008,000	177,300,000	195,570,000
Contract Receivable Retainage, Due after Next Twelve Months											10.00%
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									164,014		318,026		223,536
Impairment of Intangible Assets, Finite-lived									12,116,000		0		0												10,896,000		1,200,000
Proceeds from Divestiture of Interest in Joint Venture				9,065,000																																				9,065,000	0	0
Equity Method Investment, Other than Temporary Impairment																																							2,700,000
EquityMethodInvestmentOtherThanTemporaryImpairmentNetOfTax																																							1,800,000
Income (Loss) from Equity Method Investments									570,000	[1]	5,159,000	[2]	6,359,000	[2]																							1,200,000	1,200,000
Proceeds from Equity Method Investment, Dividends or Distributions				684,000				684,000	590,000		10,691,000		11,034,000
Gain (Loss) on Sale of Equity Investments																																								($472,000)	$0	$0
[1]	Bayou Coating was sold in March 2014. Income statement data in 2014 includes only those results up to the date of its sale.
[2]	Includes the financial data of Insituform-Germany through the date of its sale in June 2013.

Note_2_Accounting_Policies_Det1

Note 2 - Accounting Policies (Details) - Financial Data for Earnings Per Share	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Weighted average number of common shares used for basic EPS	37,651,492	38,692,658	39,222,737
Effect of dilutive stock options and restricted and deferred stock unit awards	0	389,684	313,654
Weighted average number of common shares and dilutive potential common stock used in dilutive EPS	37,651,492	39,082,342	39,536,391
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	164,014	318,026	223,536

Note_2_Accounting_Policies_Det2

Note 2 - Accounting Policies (Details) - Financial Data for Investments in Affiliated Companies (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Financial Data for Investments in Affiliated Companies [Abstract]
Current assets	$0	[1]	$10,220	[2]
Non-current assets	0	[1]	10,022	[2]
Current liabilities	0	[1]	1,743	[2]
Non-current liabilities	0	[1]	0	[2]
income statement data
Revenue	9,088	[1]	89,157	[2]	141,233	[2]
Gross profit	3,489	[1]	27,336	[2]	40,342	[2]
Net income	2,413	[1]	17,946	[2]	22,009	[2]
Equity in earnings of affiliated companies	$570	[1]	$5,159	[2]	$6,359	[2]
[1]	Bayou Coating was sold in March 2014. Income statement data in 2014 includes only those results up to the date of its sale.
[2]	Includes the financial data of Insituform-Germany through the date of its sale in June 2013.

Note_2_Accounting_Policies_Det3

Note 2 - Accounting Policies (Details) - Financial Data for Variable Interest Entities - Balance Sheet (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial Data for Variable Interest Entities - Balance Sheet [Abstract]
Current assets	$57,046	$55,651
Non-current assets	43,165	47,606
Current liabilities	22,525	33,886
Non-current liabilities	$36,155	$25,020

Note_2_Accounting_Policies_Det4

Note 2 - Accounting Policies (Details) - Financial Data for Variable Interest Entities - Income Statement (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financial Data for Variable Interest Entities - Income Statement [Abstract]
Revenue	$84,968	$85,908	$107,821
Gross profit	14,306	12,998	19,625
Net income	$2,413	$1,892	$3,622

Note_3_Supplemental_Balance_Sh2

Note 3 - Supplemental Balance Sheet Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 3 - Supplemental Balance Sheet Information [Abstract]
Depreciation	$30.20	$28	$27.10

Note_3_Supplemental_Balance_Sh3

Note 3 - Supplemental Balance Sheet Information Allowance for Doubtful Accounts (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, at beginning of year	$3,441	$2,953	$3,077
Charged to expense	21,911	1,043	428
Write-offs and adjustments	-6,045	-555	-552
Balance, at beginning of year	19,307	3,441	2,953
Bad debt expense as part of restructuring plan	$11,900

Note_3_Supplemental_Balance_Sh4

Note 3 - Supplemental Balance Sheet Information Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Costs and Estimated Earnings on Uncompleted Contracts [Abstract]
Costs incurred on uncompleted contracts	$795,139	$740,403
Estimated earnings to date	158,982	141,413
Subtotal	954,121	881,816
Less – billings to date	-903,098	-826,795
Costs and estimated earnings in excess of billings	94,045	79,999
Billings in excess of costs and estimated earnings	-43,022	-24,978
Total	$51,023	$55,021

Note_3_Supplemental_Balance_Sh5

Note 3 - Supplemental Balance Sheet Information Schedule of Inventories (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Inventories [Abstract]
Raw materials and supplies	$22,807	$19,680
Work-in-process	13,179	8,217
Finished products	9,692	12,518
Construction materials	13,514	18,353
Total	$59,192	$58,768

Note_3_Supplemental_Balance_Sh6

Note 3 - Supplemental Balance Sheet Information Schedule of Property Plant and Equipment (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2014		Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$353,722	[1]	$370,146
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		-185,509	[1]	-187,843
Property, Plant and Equipment, Net		168,213	[1]	182,303
Non-cash restructuring charges	11,900	49,500
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		12,021	[1]	11,964
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		62,548	[1]	63,870
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Esimated Useful Life		5 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Esimated Useful Life		40 years
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		185,003	[1]	185,307
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Esimated Useful Life		4 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Esimated Useful Life		10 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		27,115	[1]	25,848
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Esimated Useful Life		3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Esimated Useful Life		10 years
Autos and Trucks [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		51,635	[1]	52,145
Autos and Trucks [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Esimated Useful Life		3 years
Autos and Trucks [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Esimated Useful Life		10 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$15,400	[1]	$31,012
[1]	During the third quarter of 2014, the Company recorded asset impairments of $11.9 million related to the 2014 Restructuring Plan (see Notes 2 and 3).

Note_3_Supplemental_Balance_Sh7

Note 3 - Supplemental Balance Sheet Information Schedule of Accrued Expenses (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Accrued Expenses [Abstract]
Vendor and other accrued expenses	$49,499	$51,278
Estimated casualty and healthcare liabilities	17,780	13,775
Job costs	13,718	13,843
Accured compensation	21,033	15,942
Income tax payable and deferred income taxes	9,587	10,628
Total	$111,617	$105,466

Restructuring_Details

Restructuring (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated			31
Restructuring and Related Cost, Expected Number of Positions Eliminated			80
Proceeds from Divestiture of Businesses			$1,123,000	$0	$0
Non-cash restructuring charges		11,900,000	49,500,000
Restructuring charges	9,500,000	40,000,000	687,000	0	0
Restructuring Costs, After Tax Results			36,200,000
Restructuring and Related Cost, Incurred Cost, Noncash			43,900,000
Restructuring and Related Cost, Incurred Cost			49,518,000
Payments for Restructuring			5,600,000
Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0
Restructuring and Related Cost, Incurred Cost			22,234,000
Payments for Restructuring			0
Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			687,000
Restructuring and Related Cost, Incurred Cost			27,284,000
Payments for Restructuring			5,600,000
Ka-te [Member]
Restructuring Cost and Reserve [Line Items]
Proceeds from Divestiture of Businesses	1,100,000
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			1,000,000
Restructuring and Related Cost, Expected Cost	4,000,000		4,000,000
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			2,000,000
Restructuring and Related Cost, Expected Cost	6,000,000		6,000,000
Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			2,746,000
Inventories [Member] | Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Inventories [Member] | Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			2,746,000
Inventories [Member] | Bayou [Member] | Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			$21,700,000

Restructuring_Restructuring_Co

Restructuring Restructuring Costs by Segment (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Severance and benefit related costs	$9,500	$40,000	$687	$0	$0
Restructuring and Related Cost, Incurred Cost			49,518
Allowance for Doubtful Accounts [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,947
Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			2,746
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,871
Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			10,896
Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			5,013
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			6,358
Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Severance and benefit related costs			0
Restructuring and Related Cost, Incurred Cost			22,234
Corrosion Protection [Member] | Allowance for Doubtful Accounts [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Corrosion Protection [Member] | Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Corrosion Protection [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,338
Corrosion Protection [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			10,896
Corrosion Protection [Member] | Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Corrosion Protection [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Severance and benefit related costs			687
Restructuring and Related Cost, Incurred Cost			27,284
Infrastructure Solutions [Member] | Allowance for Doubtful Accounts [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,947
Infrastructure Solutions [Member] | Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			2,746
Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			533
Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Infrastructure Solutions [Member] | Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			5,013
Infrastructure Solutions [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			$6,358

Restructuring_Restructuring_Re

Restructuring Restructuring Reserve by Type of Cost (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$49,518,000
Restructuring and Related Costs, Non-Cash Charges	21,108,000
Payments for Restructuring	5,600,000
Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	10,896,000
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	11,871,000
Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	27,284,000
Restructuring and Related Costs, Non-Cash Charges	21,108,000
Payments for Restructuring	5,600,000
Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	533,000
Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	22,234,000
Restructuring and Related Costs, Non-Cash Charges	0
Payments for Restructuring	0
Corrosion Protection [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	10,896,000
Corrosion Protection [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	11,338,000
Cost of Sales [Member] | Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	4,348,000
Restructuring and Related Costs, Non-Cash Charges	2,774,000
Payments for Restructuring	1,100,000
Cost of Sales [Member] | Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Cost of Sales [Member] | Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	498,000
Cost of Sales [Member] | Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	11,338,000
Restructuring and Related Costs, Non-Cash Charges	0
Payments for Restructuring	0
Cost of Sales [Member] | Corrosion Protection [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Cost of Sales [Member] | Corrosion Protection [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	11,338,000
Operating Expense [Member] | Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	20,555,000
Restructuring and Related Costs, Non-Cash Charges	17,544,000
Payments for Restructuring	3,000,000
Operating Expense [Member] | Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Operating Expense [Member] | Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	35,000
Restructuring Charges [Member] | Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	687,000
Restructuring and Related Costs, Non-Cash Charges	0
Payments for Restructuring	700,000
Restructuring Charges [Member] | Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Restructuring Charges [Member] | Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Other Expense [Member] | Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	1,694,000
Restructuring and Related Costs, Non-Cash Charges	790,000
Payments for Restructuring	900,000
Other Expense [Member] | Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Other Expense [Member] | Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Definite-lived Intangible Asset Impairment [Member] | Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	10,896,000
Restructuring and Related Costs, Non-Cash Charges	0
Payments for Restructuring	0
Definite-lived Intangible Asset Impairment [Member] | Corrosion Protection [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	10,896,000
Definite-lived Intangible Asset Impairment [Member] | Corrosion Protection [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$0

Restructuring_Restructuring_Co1

Restructuring Restructuring Costs - Cash versus Non-Cash (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$9,500	$40,000	$687	$0	$0
Restructuring and Related Cost, Incurred Cost			49,518
Allowance for Doubtful Accounts [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,947
Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			2,746
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,871
Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			10,896
Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			5,013
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			6,358
Cash Payments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			221
Restructuring and Related Cost, Incurred Cost			4,083
Cash Payments [Member] | Allowance for Doubtful Accounts [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Cash Payments [Member] | Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Cash Payments [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Cash Payments [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Cash Payments [Member] | Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Cash Payments [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			3,862
Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0
Restructuring and Related Cost, Incurred Cost			31,009
Restructuring Charges [Member] | Allowance for Doubtful Accounts [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			483
Restructuring Charges [Member] | Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			2,746
Restructuring Charges [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,871
Restructuring Charges [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			10,896
Restructuring Charges [Member] | Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			5,013
Restructuring Charges [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Business Restructuring Reserves [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			466
Restructuring and Related Cost, Incurred Cost			14,426
Business Restructuring Reserves [Member] | Allowance for Doubtful Accounts [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,464
Business Restructuring Reserves [Member] | Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Business Restructuring Reserves [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Business Restructuring Reserves [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Business Restructuring Reserves [Member] | Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Business Restructuring Reserves [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			$2,496

Note_4_Goodwill_and_Intangible2

Note 4 - Goodwill and Intangible Assets (Details) (USD $)	12 Months Ended				3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Jun. 30, 2014	Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	$100,000	[1],[2]
Amortization of Intangible Assets	14,100,000		12,200,000	10,500,000
Goodwill, Impairment Loss	51,512,000		0	0
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	13 years	[3],[4]
Non-competes [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Fyfe Asia [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Purchase Accounting Adjustments						1,098,000
Impairment of Intangible Assets (Excluding Goodwill)					1,400,000
Brinderson LP [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Purchase Accounting Adjustments	1,000,000				-1,000,000
Bayou [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)							10,900,000
Europe [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)					2,700,000
CRTS [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss					5,700,000
Infrastructure Solutions [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	1,100,000	[1],[2]
Goodwill, Impairment Loss					29,700,000
Infrastructure Solutions [Member] | Fyfe Asia [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$16,069,000				($29,700,000)
[1]	During the second quarter of 2014, the Company recorded goodwill of $1.1 million related to the 2012 acquisition of Fyfe Asia (see Note 1).
[2]	During the fourth quarter of 2014, the Company decreased goodwill by $1.0 million related to the 2013 acquisition of Brinderson (see Note 1)
[3]	During the third quarter of 2014, the Company recorded an intangible asset impairment of $10.9 million related to realignment efforts at Bayou (see Note 2).
[4]	During the fourth quarter of 2014, the Company recorded an intangible asset impairment of $1.4 million related to Fyfe (see Note 2).

Note_4_Goodwill_and_Intangible3

Note 4 - Goodwill and Intangible Assets (Details) - Reconciliation Goodwill (USD $)	12 Months Ended				3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill	$348,680,000
Additions to goodwill through acquisitions	100,000	[1],[2]
Goodwill, Impairment Loss	-51,512,000		0	0
Foreign currency translation	-4,243,000
Goodwill	293,023,000		348,680,000		293,023,000
Infrastructure Solutions [Member]
Goodwill [Roll Forward]
Goodwill	195,570,000
Additions to goodwill through acquisitions	1,100,000	[1],[2]
Goodwill, Impairment Loss					-29,700,000
Foreign currency translation	-3,324,000
Goodwill	177,300,000				177,300,000
Corrosion Protection [Member]
Goodwill [Roll Forward]
Goodwill	75,862,000
Additions to goodwill through acquisitions	0	[1],[2]
Goodwill, Impairment Loss	-35,443,000
Foreign currency translation	-919,000
Goodwill	39,500,000				39,500,000
Energy Services [Member]
Goodwill [Roll Forward]
Goodwill	77,248,000
Additions to goodwill through acquisitions	-1,000,000	[1],[2]
Goodwill, Impairment Loss	0
Foreign currency translation	0
Goodwill	$76,248,000				$76,248,000
[1]	During the second quarter of 2014, the Company recorded goodwill of $1.1 million related to the 2012 acquisition of Fyfe Asia (see Note 1).
[2]	During the fourth quarter of 2014, the Company decreased goodwill by $1.0 million related to the 2013 acquisition of Brinderson (see Note 1)

Note_4_Goodwill_and_Intangible4

Note 4 - Goodwill and Intangible Assets (Details) - Intangible Assets (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$251,044		$273,385
Accumulated Amortization	-68,771		-64,102
Net Carrying Amount	182,273		209,283
Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	5 years
Gross Carrying Amount	3,908		3,917
Accumulated Amortization	-3,131		-2,977
Net Carrying Amount	777		940
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	0 years
Gross Carrying Amount	4,731		4,745
Accumulated Amortization	-4,731		-4,745
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	-623		-477
Net Carrying Amount	1,444		1,590
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	16 years
Gross Carrying Amount	21,722		21,394
Accumulated Amortization	-5,199		-4,167
Net Carrying Amount	16,523		17,227
Non-competes [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	4 years
Gross Carrying Amount	1,140		1,140
Accumulated Amortization	-839		-753
Net Carrying Amount	301		387
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	13 years	[1],[2]
Gross Carrying Amount	163,386	[1],[2]	182,703	[1],[2]
Accumulated Amortization	-32,196	[1],[2]	-28,287	[1],[2]
Net Carrying Amount	131,190	[1],[2]	154,416	[1],[2]
Patents and acquired technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	16 years	[3]
Gross Carrying Amount	54,090	[3]	57,419	[3]
Accumulated Amortization	-22,052	[3]	-22,696	[3]
Net Carrying Amount	$32,038	[3]	$34,723	[3]
[1]	During the third quarter of 2014, the Company recorded an intangible asset impairment of $10.9 million related to realignment efforts at Bayou (see Note 2).
[2]	During the fourth quarter of 2014, the Company recorded an intangible asset impairment of $1.4 million related to Fyfe (see Note 2).
[3]	During the fourth quarter of 2014, the Company wrote off approximately $2.7 million in patents primarily related to Europe and in connection with the 2014 Restructuring Plan (see Note 3).

Note_4_Goodwill_and_Intangible5

Note 4 - Goodwill and Intangible Assets (Details) - Estimated Future Amortization Expense by Year (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Estimated Future Amortization Expense by Year [Abstract]
2013	$13,443
2014	13,454
2015	13,399
2016	13,320
2017	$13,149

Note_5_LongTerm_Debt_and_Credi2

Note 5 - Long-Term Debt and Credit Facility (Details) (USD $)	0 Months Ended	1 Months Ended		12 Months Ended
	Jul. 01, 2013	Jul. 31, 2013	Apr. 30, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Jul. 02, 2013
Debt Instrument [Line Items]
LineOfCreditFacilityTerm	5 years
Derivative, Fixed Interest Rate		0.87%		0.87%
TermLoanTerm		5 years
Debt Instrument, Maturity Date		1-Jul-18
Proceeds from line of credit			$18,000,000	$18,000,000	$0	$26,000,000
Credit Facility, Retired Amount	232,300,000
Business Combination, Consideration Paid	7,000,000
Other Long-term Debt				4,300,000	4,900,000
Other Loans Payable				100,000	100,000
Letters of Credit Outstanding, Amount				27,300,000
Long-term Debt, Fair Value				377,000,000	380,100,000
Derivative, Variable Interest Rate				2.21%
Credit Facility Maximum Consolidated Leverage Ratio				3.75
CreditFacilityMinimumConsolidatedLeverageRatio				3.5
Credit Facility Actual Consolidated Leverage Ratio				2.9
Line of Credit Facility, Remaining Borrowing Capacity				77,100,000
Credit Facility Minimum Consolidated Fixed Charge Ratio				1.25
Credit Facility Actual Consolidated Fixed Charge Ratio				1.54
2013 Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		650,000,000
Line of Credit Facility, Maximum Borrowing Capacity		300,000,000
Secured Debt		350,000,000		319,375,000	341,250,000
Line of Credit Facility, Amount Outstanding	35,500,000			45,500,000
Proceeds from line of credit				10,000,000
Debt Instrument, Description of Variable Rate Basis				one month LIBOR borrowing rate
Debt Instrument, Interest Rate at Period End				2.13%
Derivative, Amount of Hedged Item		175,000,000
2011 Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding					35,500,000
Minimum [Member] | 2013 Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.25%
Maximum [Member] | 2013 Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				2.25%
Bayou Wasco [Member]
Debt Instrument [Line Items]
Due from Joint Ventures							16,600,000
Wasco Energy [Member]
Debt Instrument [Line Items]
Due from Joint Ventures				8,100,000	6,900,000
Initial [Member]
Debt Instrument [Line Items]
Due from Joint Ventures				8,000,000	8,000,000
Additional [Member]
Debt Instrument [Line Items]
Due from Joint Ventures				6,200,000	6,200,000		2,600,000
BPPC [Member]
Debt Instrument [Line Items]
Due from Joint Ventures				14,200,000	14,200,000
Bayou Wasco [Member]
Debt Instrument [Line Items]
Due from Joint Ventures					14,000,000
Bayou Wasco [Member] | Initial [Member]
Debt Instrument [Line Items]
Due from Joint Ventures				14,000,000
Insurance Carriers Collateral [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				10,200,000
Work Performance Obligations [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				17,100,000
2013 Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative Asset, Notional Amount		175,000,000
Brinderson LP [Member]
Debt Instrument [Line Items]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$147,600,000			$146,600,000				$147,600,000

Note_5_LongTerm_Debt_and_Credi3

Note 5 - Long-Term Debt and Credit Facility (Details) - Debt Instruments Table (USD $)	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2013	Jul. 01, 2013
Long-term debt, term note and notes payable:
Other notes with interest rates from 3.3% to 6.5%	$12,600,000	$11,890,000
Subtotal	377,475,000	388,640,000
Less – Current maturities and notes payable	26,399,000	22,024,000
Long-term debt, less current maturities	351,076,000	366,616,000
Principal payments in next five years:
2014	26,399,000
2015	34,932,000
2016	41,784,000
2017	274,360,000
2018	0
Long-term debt, less current maturities	351,076,000	366,616,000
2013 Credit Facility [Member]
Long-term debt, term note and notes payable:
Term note, current annualized rate 2.21% due July 1, 2018	319,375,000	341,250,000	350,000,000
Line of credit, 2.17% in 2013 and 2.49% in 2012	45,500,000			35,500,000
2011 Credit Facility [Member]
Long-term debt, term note and notes payable:
Line of credit, 2.17% in 2013 and 2.49% in 2012		$35,500,000

Note_6_Stockholders_Equity_Det

Note 6 - Stockholders' Equity (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Stock Repurchase Program, Authorized Amount	$20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	503,134	1,208,824	1,216,809	1,107,712
Through the Open Market Repurchase Program [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Stock Repurchased During Period, Shares (in Shares)	860,761	1,102,454
Stock Repurchased During Period, Value	20	25
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)	$23.24	$22.68
In Connection with Equity Compensation Programs [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Stock Repurchase Program, Authorized Amount	10
Stock Repurchased During Period, Shares (in Shares)	54,334	115,931
Stock Repurchased During Period, Value	1.2	2.6
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)	$22.62	$22.84
Employee Stock Option [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Stock Repurchased During Period, Shares (in Shares)	419,643
Stock Repurchased During Period, Value	9.8
Stock Repurchased During Period, Net Cash Value	$1.40
Stock Awards [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	767,540	555,025	698,869	643,117
Restricted Stock [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	242,722	435,025	239,523
2013 Employee Plan [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	2,895,000
2013 Employee Plan [Member] | Employee Stock Option [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	5,546
2013 Employee Plan [Member] | Stock Awards [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	512,630
2009 Employee Plan [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	293,159
2009 Employee Plan [Member] | Stock Awards [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	254,910
2006 Employee Plan [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	204,429
2006 Employee Plan [Member] | Stock Awards [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	0
2011 Director Plan [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	200,000
2011 Director Plan [Member] | Deferred Stock Units [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	116,798
2006 Director Plan [Member] | Deferred Stock Units [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	50,098
2001 Director Plan [Member] | Deferred Stock Units [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	54,575

Note_7_Equitybased_Compensatio2

Note 7 - Equity-based Compensation (Details) - Summary of Stock Award Activity (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock award activity [Rollforward]
Expense associated with stock awards	$3,600,000	$3,000,000	$4,100,000
Unrecognized pre-tax expense	$11,200,000
Remaining period for recognition	2 years 0 months 18 days
Stock Awards [Member]
Stock award activity [Rollforward]
Stock Awards - Outstanding				643,117
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)				$17.48
Stock Awards - Outstanding	767,540	555,025	698,869	643,117
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	$21.93	$22.79	$19.39	$17.48
Restricted Stock [Member]
Stock award activity [Rollforward]
Stock Awards - Awarded	242,722	435,025	239,523
Weighted Average Award Date Fair Value - Awarded (in Dollars per share)	$23.76	$24.09	$18.07
Stock Awards - Distributed	-118,828	-274,784	-289,001
Weighted Average Award Date Fair Value - Distributed (in Dollars per share)	$23.55	$19.04	$13.42
Stock Awards - Forfeited	-104,013	-236,388	-36,325
Weighted Average Award Date Fair Value - Forfeited (in Dollars per share)	$23.77	$23.10	$20.13
Restricted Stock Units (RSUs) [Member]
Stock award activity [Rollforward]
Stock Awards - Awarded	395,352	112,401	222,379
Weighted Average Award Date Fair Value - Awarded (in Dollars per share)	$21.75	$25.11	$18.11
Stock Awards - Distributed	-15,277	-13,761	-15,177
Weighted Average Award Date Fair Value - Distributed (in Dollars per share)	$21.25	$18.87	$14.32
Stock Awards - Forfeited	-187,441	-166,337	-65,647
Weighted Average Award Date Fair Value - Forfeited (in Dollars per share)	$24.48	$19.55	$18.18

Note_7_Equitybased_Compensatio3

Note 7 - Equity-based Compensation (Details) - Summary of Deferred Stock Unit Activity (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 6 - Stockholders' Equity and Equity Compensation (Details) - Summary of Deferred Stock Unit Activity [Line Items]
Deferred Stock Unit, Share Transfer Obligation (in Shares)		1
Expense recorded	$3,600	$3,000	$4,100
Deferred Stock Units [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) - Summary of Deferred Stock Unit Activity [Line Items]
Stock Awards - Outstanding	214,455	181,518	173,916
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	$19.56	$19.06	$20.12
Stock Awards - Awarded	38,810	39,966	41,734
Awarded (in Dollars per share)	$22.89	$22.33	$17.78
Shares distributed	-31,794	-7,029	-34,132
Shares distributed (in Dollars per share)	$19.70	$22.67	$22.90
Stock Awards - Outstanding	221,471	214,455	181,518
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	$20.10	$19.56	$19.06
Expense recorded	$890	$890	$700

Note_7_Equitybased_Compensatio4

Note 7 - Equity-based Compensation (Details) - Summary of Stock Option Activity (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, 2013	1,208,824	1,216,809	1,107,712
Outstanding at January 1, 2013 (in Dollars per share)	$18.54	$18.46	$18.98
Granted	38,820	29,025	281,696
Granted (in Dollars per share)	$24.21	$25.11	$18.11
Exercised	-526,359	-29,511	-52,676
Exercised (in Dollars per share)	$16.36	$20.14	$16.66
Canceled/Expired	-218,151	-7,499	-119,923
Canceled/Expired (in Dollars per share)	$25.61	$24.58	$23.21
Outstanding at December 31, 2013	503,134	1,208,824	1,216,809
Outstanding at December 31, 2013 (in Dollars per share)	$18.18	$18.54	$18.46
Exercisable at December 31, 2013	452,236	933,738	758,270
Exercisable at December 31, 2013 (in Dollars per share)	$18.12	$17.84	$16.80
Expense recorded	$3,600,000	$3,000,000	$4,100,000
Unrecognized pre-tax expense	11,200,000
Remaining period for recognition	2 years 0 months 18 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options, General Term	7 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options, General Term	10 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recorded	600,000	1,700,000	2,100,000
Unrecognized pre-tax expense	$100,000
Remaining period for recognition	1 year 0 months 15 days

Note_7_Equitybased_Compensatio5

Note 7 - Equity-based Compensation (Details) - Additional Stock Option Information (USD $)	12 Months Ended
In Thousands, except Share data in Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount collected from stock option exercises	$8,614	$738	$1,054
Total intrinsic value of stock option exercises	3,771	131	177
Tax benefit of stock option exercises recorded in additional paid-in-capital	6	55	66
Aggregate intrinsic value of outstanding stock options	1,231	5,383	5,708
Aggregate intrinsic value of exercisable stock options	$1,209	$4,695	$4,601
Price Per Share For Intrinsic Value Calculation Stock Options (in Dollars per share)	$18.61	$21.89	$22.19
Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)		2
Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)		0.1

Note_7_Equitybased_Compensatio6

Note 7 - Equity-based Compensation (Details) - Binomial Option-Pricing Model Assumptions (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant-date fair value (in Dollars per share)	$11.27	$12.92	$8.19
Volatility	41.60%	49.80%	45.10%
Volatility, Minimum			43.00%
Volatility, Maximum			45.20%
Expected term (years)	7 years	7 years	7 years
Dividend yield	0.00%	0.00%	0.00%
Risk-free rate	2.30%	1.10%	1.50%
Risk-free rate, Minimum			1.00%
Risk-free rate, Maximum			1.50%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant-date fair value (in Dollars per share)			$8.14
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant-date fair value (in Dollars per share)			$8.19

Note_8_Taxes_on_Income_Tax_Ben2

Note 8 - Taxes on Income (Tax Benefits) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$500,000
Undistributed Earnings of Foreign Subsidiaries	277,000,000
Deferred Tax Assets, Operating Loss Carryforwards	19,355,000	17,146,000
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		10,500,000
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration		8,900,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Deferred Tax Assets, Operating Loss Carryforwards, Foreign		1,500,000
Deferred Tax Assets, Tax Credit Carryforwards	500,000
Deferred Tax Assets, Valuation Allowance	19,353,000	7,797,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	300,000	300,000	600,000
Expiration of Statute of Limitations [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$200,000

Note_8_Taxes_on_Income_Tax_Ben3

Note 8 - Taxes on Income (Tax Benefits) Schedule of Income Before Tax, Domestic and Foreign (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Before Tax, Domestic and Foreign [Abstract]
Domestic	($75,112)	$23,695	$45,290
Foreign	39,137	35,307	25,576
Income before taxes on income	($35,975)	$59,002	$70,866

Note_8_Taxes_on_Income_Tax_Ben4

Note 8 - Taxes on Income (Tax Benefits) Components of Income Tax Expense (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	($2,112)	$8,603	$9,237
Foreign	10,586	6,078	9,704
State	2,635	527	995
Subtotal	11,109	15,208	19,936
Deferred:
Federal	-18,629	-2,075	-1,817
Foreign	3,034	-727	69
State	646	-252	475
Subtotal	-14,949	-3,054	-1,273
Total tax provision	($3,840)	$12,154	$18,663

Note_8_Taxes_on_Income_Tax_Ben5

Note 8 - Taxes on Income (Tax Benefits) Effective Rate Reconciliation (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Income taxes at U.S. federal statutory tax rate	($12,591)	$20,651	$24,803
State income taxes, net of federal income tax benefit	-3,073	64	966
Domestic Production Activities Deduction	-81	-1,548	-1,440
Meals and entertainment	863	1,034	962
Changes in taxes previously accrued	-1,932	-3,098	-2,422
Foreign tax rate differences	-9,215	-4,892	-4,236
Goodwill impairment	9,690	0	0
Recognition of uncertain tax positions	-96	-89	-800
Total tax provision	-3,840	12,154	18,663
Effective tax rate	10.70%	20.60%	26.30%
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Change in the balance of the valuation allowance for deferred tax assets allocated to income tax expense	7,785	1,447	3,714
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Change in the balance of the valuation allowance for deferred tax assets allocated to income tax expense	5,206	115	-10
Acquisition-related Costs [Member]
Operating Loss Carryforwards [Line Items]
Transaction costs	0	0	509
Contingent Consideration Reversal [Member]
Operating Loss Carryforwards [Line Items]
Transaction costs	0	-1,461	-2,869
Other Matters [Member]
Operating Loss Carryforwards [Line Items]
Transaction costs	($396)	($69)	($514)

Note_8_Taxes_on_Income_Tax_Ben6

Note 8 - Taxes on Income (Tax Benefits) Net Deferred Taxes (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred income tax assets:
Foreign tax credit carryforwards	$1,477	$535
Net operating loss carryforwards	19,355	17,146
Accrued expenses	21,378	13,517
Other	7,207	8,158
Total gross deferred income tax assets	49,417	39,356
Less valuation allowance	-19,353	-7,797
Net deferred income tax assets	30,064	31,559
Deferred income tax liabilities:
Property, plant and equipment	-7,499	-12,901
Intangible assets	-22,653	-34,983
Undistributed foreign earnings	-7,051	-7,051
Other	-6,859	-7,548
Total deferred income tax liabilities	44,062	62,483
Net deferred income tax liabilities	13,998	30,924
Current deferred income tax assets, net	9,516	4,640
Current deferred income tax liabilities, net	-3,935	-4,304
Noncurrent deferred income tax assets, net	3,334	6,957
Noncurrent deferred income tax liabilities, net	($22,913)	($38,217)

Note_8_Taxes_on_Income_Tax_Ben7

Note 8 - Taxes on Income (Tax Benefits) Valuation Allowance Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation Allowance Activity [Abstract]
Balance, at beginning of year	$7,797,000	$6,574,000	$4,691,000
Additions	14,442,000	1,754,000	2,062,000
Reversals	-2,090,000	-131,000	-191,000
Other adjustments	-796,000	-400,000	12,000
Balance, at end of year	19,353,000	7,797,000	6,574,000
Undistributed Earnings of Foreign Subsidiaries	$277,000,000

Note_8_Taxes_on_Income_Tax_Ben8

Note 8 - Taxes on Income (Tax Benefits) Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$500,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	300,000	300,000	600,000
Balance at January 1,	2,936,000	3,170,000	1,050,000
Additions for tax positions of prior years related to acquisitions	36,000	30,000	111,000
Lapse in statute of limitations	-252,000	-236,000	-1,162,000
Foreign currency translation	-48,000	-28,000	26,000
Balance at December 31,	2,672,000	2,936,000	3,170,000
Post Acquisition [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Additions for tax positions of prior years related to acquisitions	0	0	3,145,000
Expiration of Statute of Limitations [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$200,000

Note_9_Commitments_and_Conting2

Note 9 - Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Operating Leases, Rent Expense	$24,100,000	$19,500,000	$18,700,000
Loss Contingency, Range of Possible Loss, Minimum	0
Loss Contingency, Range of Possible Loss, Maximum	24,000,000
Defined Benefit Plan, Contributions by Employer	200,000	300,000
Defined Benefit Plan, Benefit Obligation	8,600,000	7,900,000
Defined Benefit Plan, Fair Value of Plan Assets	10,100,000	9,600,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.40%
Defined Benefit Plan, Amounts Recognized in Balance Sheet	1,500,000
United States [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Cost Recognized	5,300,000	4,500,000	3,700,000
Foreign [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Cost Recognized	$1,200,000	$1,200,000	$1,400,000

Note_9_Commitments_and_Conting3

Note 9 - Commitments and Contingencies (Details) - Lease Payments (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Future Lease Payments Table [Abstract]
2014	$17,140
2015	13,476
2016	8,715
2017	5,523
2018	3,237
Thereafter	2,815
Total	$50,906

Note_10_Derivative_Financial_I2

Note 10 - Derivative Financial Instruments (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Jul. 31, 2013
Debt Instrument [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$100,000	$100,000	$100,000
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax				-23,400,000	600,000
Derivative, Variable Interest Rate	2.21%
Derivative, Fixed Interest Rate Percentage	0.87%					0.87%
2011 Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative Asset, Notional Amount						83,000,000
2013 Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative Asset, Notional Amount						175,000,000
Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	100,000
2013 Credit Facility [Member]
Debt Instrument [Line Items]
Derivative, Amount of Hedged Item						175,000,000
Secured Debt	$319,375,000	$341,250,000				350,000,000

Note_10_Derivative_Financial_I3

Note 10 - Derivative Financial Instruments (Details) - Summary of the Fair Value Amounts of Derivative Instruments (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Significant Observable Inputs (Level 2) [Member]
Derivatives Designated as Hedging Instruments
Forward Currency Contracts	$26	$24
Cash Flow Hedge Derivative Instrument Assets at Fair Value	26	24
Forward Currency Contracts		0
Interest Rate Swaps	729	1,220
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	729	1,220
Derivatives Not Designated as Hedging Instruments
Forward Currency Contracts	62	752
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	62	752
Forward Currency Contracts	0	0
Derivative Assets (Liabilities), at Fair Value, Net	641	444
Fair Value, Measurements, Recurring [Member]
Derivatives Not Designated as Hedging Instruments
Total Derivative Assets	88
Foreign Currency Contract, Asset, Fair Value Disclosure	88
Total Derivative Liabilities	729	1,220
Interest Rate Derivative Liabilities, at Fair Value	729	1,220
Fair Value, Measurements, Recurring [Member] | Significant Observable Inputs (Level 2) [Member]
Derivatives Not Designated as Hedging Instruments
Total Derivative Assets	88
Foreign Currency Contract, Asset, Fair Value Disclosure	88	776
Total Derivative Liabilities	729	1,220
Interest Rate Derivative Liabilities, at Fair Value	$729	$1,220

Note_10_Derivative_Financial_I4

Note 10 - Derivative Financial Instruments (Details) - Liabilities Measured at Fair Value on a Recurring Basis and the Basis for that Measurement (Fair Value, Measurements, Recurring [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Forward Currency Contracts	$88
Total Derivative Assets	88
Liabilities
Forward Currency Contracts		0
Interest Rate Swap	729	1,220
Total Derivative Liabilities	729	1,220
Quoted Prices (Level 1) [Member]
Assets
Forward Currency Contracts	0
Total Derivative Assets	0
Liabilities
Forward Currency Contracts		0
Interest Rate Swap	0	0
Total Derivative Liabilities	0	0
Significant Observable Inputs (Level 2) [Member]
Assets
Forward Currency Contracts	88	776
Total Derivative Assets	88
Liabilities
Forward Currency Contracts		0
Interest Rate Swap	729	1,220
Total Derivative Liabilities	729	1,220
Significant Unobservable Inputs (Level 3) [Member]
Assets
Forward Currency Contracts	0
Total Derivative Assets	0
Liabilities
Forward Currency Contracts		0
Interest Rate Swap	0	0
Total Derivative Liabilities	$0	$0

Note_10_Derivative_Financial_I5

Note 10 - Derivative Financial Instruments (Details) - Summary of the Company’s Derivative Positions	12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
	Australian Dollar/USD [Member]	Australian Dollar/USD [Member]	USD/British Pound [Member]	USD/British Pound [Member]	EURO/British Pound [Member]	EURO/British Pound [Member]	Interest Rate Swap [Member]	Interest Rate Swap [Member]
		Sell [Member]		Sell [Member]		Sell [Member]		Sell [Member]
		USD ($)		GBP (£)		GBP (£)		USD ($)
Note 10 - Derivative Financial Instruments (Details) - Summary of the Company’s Derivative Positions [Line Items]
Notional Amount		$3,221,784		£ 3,050,450		£ 10,245,902		$159,687,500
Weighted Average Remaining Maturity In Years	6 months 0 days		6 months 0 days		6 months 0 days		1 year 7 months 10 days
Average Exchange Rate	0.82		1.56		0.78

Note_11_Discontinued_Operation2

Note 11 - Discontinued Operations (Details) (USD $)	3 Months Ended			12 Months Ended
	Sep. 30, 2014	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 11 - Discontinued Operations [Line Items]
Goodwill and Intangible Asset Impairment		$3,900,000
Goodwill and Intangible Asset Impairment, Net of Tax		2,400,000
Tangible Asset Impairment Charges	11,870,000	1,100,000
Tangible Asset Impairment Charges, Net of Tax		700,000
Business Exit Costs		100,000
Goodwill and Intagible Assets [Member]
Note 11 - Discontinued Operations [Line Items]
Impairment Effect on Earnings Per Share, after Tax (in Dollars per share)		$0.06
Tangible Assets [Member]
Note 11 - Discontinued Operations [Line Items]
Impairment Effect on Earnings Per Share, after Tax (in Dollars per share)		$0.02
Bayou Welding Works [Member]
Note 11 - Discontinued Operations [Line Items]
Business Exit Costs				0	5,019,000	0
Disposal Group, Including Discontinued Operation, General and Administrative Expense			1,400,000
Disposal Group, Including Discontinued Operation, Operating Income (Loss)				($6,008,000)	($11,247,000)	$2,683,000

Note_11_Discontinued_Operation3

Note 11 - Discontinued Operations (Details) - Operating Results for Discontinued Operations (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Closure charges of welding business	$100
Disposal Group, Including Discontinued Operation, Other Expense		-74	0	0
Bayou Welding Works [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		0	9,763	11,132
Gross profit (loss)		-67	-4,255	-645
Operating expenses		-5,941	1,973	2,038
Closure charges of welding business		0	5,019	0
Operating loss		-6,008	-11,247	2,683
Loss before tax benefits		-6,082	-10,731	-2,904
Tax benefits		2,235	4,270	1,191
Net loss		($3,847)	($6,461)	($1,713)

Note_11_Discontinued_Operation4

Note 11 - Discontinued Operations (Details) - Balance Sheet Data for Discontinued Operations (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Costs and estimated earnings in excess of billings	$51,023	$55,021
Bayou Welding Works [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets	0	8,356
Total liabilities	0	2,267
Discontinued Operations [Member] | Bayou Welding Works [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restricted cash	0	1,193
Receivables, net	0	4,038
Prepaid expenses and other current assets	0	204
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	0	1,118
Other assets	0	1,803
Accounts payable	0	2,050
Accrued expenses	0	20
Deferred tax liability	$0	$197

Note_12_Segment_and_Geographic2

Note 12 - Segment and Geographic Information (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
			market
			segment
Segment Reporting [Abstract]
Number of Markets			3
Number of Reportable Segments			3
Business Combination, Acquisition Related Costs (in Dollars)			$1,375	$5,831	$3,124
Restructuring charges	9,500	40,000	687	0	0
Goodwill, Impairment Loss			51,512	0	0
Impairment of Intangible Assets, Finite-lived			$12,116	$0	$0

Note_12_Segment_and_Geographic3

Note 12 - Segment and Geographic Information (Details) - Financial Information by Segment (USD $)	3 Months Ended												12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues:
Revenues	$352,181	[1]	$350,138	[2]	$322,868	$306,234	$315,679	[3]	$307,665	[3]	$242,100	$225,976	$1,331,421	[4]	$1,091,420	[4]	$1,016,831	[4]
Operating income (loss):													44,312		40,329		37,658
Operating income (loss)	-35,631	[1]	-13,934	[2]	20,619	9,134	22,209	[3]	22,032	[3]	15,823	6,818	-19,812		66,882		81,803
Assets
Assets	1,295,673						1,377,418						1,295,673		1,377,418		1,217,894
Capital expenditures:
Payments to Acquire Property, Plant, and Equipment													32,899		26,085		44,738
Infrastructure Solutions [Member]
Revenues:
Revenues													567,205		529,301		502,856
Operating income (loss):													15,726		16,552		17,800
Operating income (loss)													-6,194		28,487		21,809
Assets
Assets	485,785						514,778						485,785		514,778		531,124
Capital expenditures:
Payments to Acquire Property, Plant, and Equipment													13,096		8,828		7,848
Corrosion Protection [Member]
Revenues:
Revenues													458,409		453,886		513,975
Operating income (loss):													19,259		18,736		18,175
Operating income (loss)													-31,010		37,253		59,994
Assets
Assets	506,659						547,280						506,659		547,280		569,109
Capital expenditures:
Payments to Acquire Property, Plant, and Equipment													12,107		14,399		34,796
Corporate and Other [Member]
Revenues:
Operating income (loss):													2,323		1,823		1,683
Assets
Assets	105,371						116,316						105,371		116,316		101,851
Capital expenditures:
Payments to Acquire Property, Plant, and Equipment													3,976		1,890		2,094
Discontinued Operations [Member]
Assets
Assets	0						8,356						0		8,356		15,810
Energy Services [Member]
Revenues:
Revenues													305,807		108,233		0
Operating income (loss):													7,004		3,218		0
Operating income (loss)													17,392		1,142		0
Assets
Assets	197,858						190,688						197,858		190,688		0
Capital expenditures:
Payments to Acquire Property, Plant, and Equipment													$3,720		$968		$0
[1]	Includes expenses of $9.5 million related to our 2014 Restructuring Plan and $52.7 million related to certain goodwill and definite-lived intangible asset impairments (see Notes 2, 3 and 5).
[2]	Includes expenses of $40.0 million related to our 2014 Restructuring Plan (see Note 3).
[3]	Includes the financial results of Brinderson, which was acquired in July 2013 (see Note 1).
[4]	Revenues and long-lived assets 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.

Note_12_Segment_and_Geographic4

Note 12 - Segment and Geographic Information (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Revenues:

Revenues

$352,181

[1]

$350,138

[2]

$322,868

$306,234

$315,679

[3]

$307,665

[3]

$242,100

$225,976

$1,331,421

[4]

$1,091,420

[4]

$1,016,831

[4]

Operating income (loss):

Operating income (loss)

-35,631

[1]

-13,934

[2]

20,619

9,134

22,209

[3]

22,032

[3]

15,823

6,818

-19,812

66,882

81,803

Long-lived assets: (1)

Long-lived assets

178,921

[4],[5]

205,719

[4],[5]

178,921

[4],[5]

205,719

[4],[5]

210,497

[4],[5]

United States [Member]

Revenues:

Revenues

926,834

[4]

672,192

[4]

589,027

[4]

Operating income (loss):

Operating income (loss)

-45,945

24,977

40,676

Long-lived assets: (1)

Long-lived assets

135,898

[4],[5]

154,367

[4],[5]

135,898

[4],[5]

154,367

[4],[5]

151,337

[4],[5]

Canada [Member]

Revenues:

Revenues

202,806

[4]

179,236

[4]

180,283

[4]

Operating income (loss):

Operating income (loss)

36,883

28,955

31,376

Long-lived assets: (1)

Long-lived assets

25,610

[4],[5]

28,539

[4],[5]

25,610

[4],[5]

28,539

[4],[5]

28,724

[4],[5]

Europe [Member]

Revenues:

Revenues

85,614

[4]

90,646

[4]

86,883

[4]

Operating income (loss):

Operating income (loss)

1,862

6,276

6,196

Long-lived assets: (1)

Long-lived assets

8,984

[4],[5]

10,007

[4],[5]

8,984

[4],[5]

10,007

[4],[5]

16,396

[4],[5]

Other foreign [Member]

Revenues:

Revenues

116,167

[4]

149,346

[4]

160,638

[4]

Operating income (loss):

Operating income (loss)

-12,612

6,674

3,555

Long-lived assets: (1)

Long-lived assets

$8,429

[4],[5]

$12,806

[4],[5]

$8,429

[4],[5]

$12,806

[4],[5]

$14,040

[4],[5]

[1]

Includes expenses of $9.5 million related to our 2014 Restructuring Plan and $52.7 million related to certain goodwill and definite-lived intangible asset impairments (see Notes 2, 3 and 5).

[2]

Includes expenses of $40.0 million related to our 2014 Restructuring Plan (see Note 3).

[3]

Includes the financial results of Brinderson, which was acquired in July 2013 (see Note 1).

[4]

Revenues and long-lived assets 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.

[5]

Long-lived assets as of December 31, 2014, 2013 and 2012 do not include intangible assets, goodwill or deferred tax assets.

Note_13_Selected_Quarterly_Dat2

Note 13 - Selected Quarterly Data (Details) - Income Statement (USD $)	3 Months Ended												12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Quarterly Financial Data - Income Statement [Abstract]
Revenues	$352,181	[1]	$350,138	[2]	$322,868	$306,234	$315,679	[3]	$307,665	[3]	$242,100	$225,976	$1,331,421	[4]	$1,091,420	[4]	$1,016,831	[4]
Gross profit	83,063	[1]	63,939	[2]	71,918	61,063	70,905	[3]	69,411	[3]	58,568	48,137	279,983		247,021		243,754
Operating income	-35,631	[1]	-13,934	[2]	20,619	9,134	22,209	[3]	22,032	[3]	15,823	6,818	-19,812		66,882		81,803
Income from continuing operations	-32,800	[1]	-16,101	[2]	12,776	4,560	14,730	[3]	14,623	[3]	18,396	4,258
Loss from discontinued operations	-3,221	[1]	-130	[2]	-364	-132	-5	[3]	-558	[3]	-4,977	-921
Net income attributable to Aegion Corporation	-36,021	[1]	-16,231	[2]	12,412	4,428	14,725	[3]	14,065	[3]	13,419	3,337	-37,167		44,351		52,661
Basic earnings per share:
Income from continuing operations (in Dollars per share)	($0.90)	[1]	($0.45)	[2]	$0.34	$0.12	$0.38	[3]	$0.37	[3]	$0.47	$0.09	($0.88)		$1.31		$1.38
Loss from discontinued operations (in Dollars per share)	($0.09)	[1]	$0	[2]	($0.01)	$0	$0	[3]	($0.01)	[3]	($0.13)	($0.02)	($0.10)		($0.17)		($0.04)
Net income (in Dollars per share)	($0.99)	[1]	($0.45)	[2]	$0.33	$0.12	$0.38	[3]	$0.36	[3]	$0.34	$0.07	($0.98)		$1.14		$1.34
Diluted earnings per share
Income from continuing operations (in Dollars per share)	($0.90)	[1]	($0.45)	[2]	$0.33	$0.12	$0.37	[3]	$0.37	[3]	$0.47	$0.09	($0.88)		$1.30		$1.37
Loss from discontinued operations (in Dollars per share)	($0.09)	[1]	$0	[2]	($0.01)	$0	$0	[3]	($0.01)	[3]	($0.13)	($0.02)	($0.10)		($0.17)		($0.04)
Net income (in Dollars per share)	($0.99)	[1]	($0.45)	[2]	$0.32	$0.12	$0.37	[3]	$0.36	[3]	$0.34	$0.07	($0.98)		$1.13		$1.33
Restructuring charges	9,500		40,000										687		0		0
Asset Impairment Charges	$52,700												$11,870		$0		$0
[1]	Includes expenses of $9.5 million related to our 2014 Restructuring Plan and $52.7 million related to certain goodwill and definite-lived intangible asset impairments (see Notes 2, 3 and 5).
[2]	Includes expenses of $40.0 million related to our 2014 Restructuring Plan (see Note 3).
[3]	Includes the financial results of Brinderson, which was acquired in July 2013 (see Note 1).
[4]	Revenues and long-lived assets 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.