Aegion 10-K 28 Feb 14 2013 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 20, 2014	Jun. 28, 2013
Document and Entity Information [Abstract]	'	'	'
Entity Registrant Name	'Aegion Corp	'	'
Document Type	'10-K	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Public Float	'	'	$870,789,221
Entity Common Stock, Shares Outstanding	'	37,971,866	'
Amendment Flag	'false	'	'
Entity Central Index Key	'0000353020	'	'
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-13	'	'
Document Fiscal Year Focus	'2013	'	'
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, 2013		Dec. 31, 2012	Dec. 31, 2011
Revenues	$1,091,420		$1,016,831	$925,766
Cost of revenues	844,399		773,077	723,087
Gross profit	247,021		243,754	202,679
Operating expenses	178,483		168,846	150,149
Earnout reversal	-4,175		-10,019	-1,700
Acquisition-related expenses	5,831		3,124	6,372
Restructuring charges	0		0	2,151
Operating income	66,882		81,803	45,707
Other income (expense):	'		'	'
Interest expense	-13,169		-10,071	-14,973
Interest income	325		505	334
Other	4,964		-1,371	1,902
Total other expense	-7,880		-10,937	-12,737
Income before taxes on income	59,002		70,866	32,970
Taxes on income	12,154		18,663	8,184
Income before equity in earnings of affiliated companies	46,848		52,203	24,786
Equity in earnings of affiliated companies	5,159	[1]	6,359	3,471
Income from continuing operations	52,007		58,562	28,257
Loss from discontinued operations	-6,461		-1,713	-587
Net income	45,546		56,849	27,670
Non-controlling interests	-1,195		-4,188	-1,123
Net income attributable to Aegion Corporation	$44,351		$52,661	$26,547
Basic:	'		'	'
Income from continuing operations (in Dollars per share)	$1.31		$1.38	$0.68
Loss from discontinued operations (in Dollars per share)	($0.17)		($0.04)	($0.01)
Net income (in Dollars per share)	$1.14		$1.34	$0.67
Diluted:	'		'	'
Income from continuing operations (in Dollars per share)	$1.30		$1.37	$0.68
Loss from discontinued operations (in Dollars per share)	($0.17)		($0.04)	($0.01)
Net income (in Dollars per share)	$1.13		$1.33	$0.67
[1]	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, 2013		Dec. 31, 2012		Dec. 31, 2011
Net income	$45,546		$56,849		$27,670
Other comprehensive income:	'		'		'
Currency translation adjustments	-13,428		9,691		-12,691
Pension activity, net of tax	38	[1]	154	[1]	-551	[1]
Deferred loss on hedging activity, net of tax	-255	[2]	-134	[2]	-135	[2]
Total comprehensive income	31,901		66,560		14,293
Less: comprehensive income attributable to noncontrolling interests	-749		-4,501		3
Comprehensive income attributable to Aegion Corporation	$31,152		$62,059		$14,296
[1]	Amounts presented net of tax of $11, $46, and $(184) for the years ended December 31, 2013, 2012, and 2011, respectively.
[2]	Amounts presented net of tax of $(168), $(89) and $(88) for the years ended December 31, 2013, 2012 and 2011, respectively.

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parentheticals) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	$11	$46	($184)
Deferred loss on hedging activity, tax	($168)	($89)	($88)

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$158,045	$133,676
Restricted cash	483	382
Receivables, net	231,775	232,854
Retainage	30,831	30,172
Costs and estimated earnings in excess of billings	79,999	67,740
Inventories	58,768	59,123
Prepaid expenses and other current assets	38,522	27,728
Current assets of discontinued operations	5,435	8,986
Total current assets	603,858	560,661
Property, plant & equipment, less accumulated depreciation	182,303	183,163
Other assets	'	'
Goodwill	334,180	272,294
Identified intangible assets, less accumulated amortization	209,283	159,629
Investments	9,101	19,181
Deferred income tax assets	6,957	7,989
Other assets	14,315	8,153
Total other assets	573,836	467,246
Non-current assets of discontinued operations	2,921	6,824
Total Assets	1,362,918	1,217,894
Current liabilities	'	'
Accounts payable	80,417	74,724
Accrued expenses	90,966	79,580
Billings in excess of costs and estimated earnings	24,978	31,552
Current maturities of long-term debt and line of credit	22,024	33,775
Current liabilities of discontinued operations	2,070	4,885
Total current liabilities	220,455	224,516
Long-term debt, less current maturities	366,616	221,848
Deferred income tax liabilities	38,217	39,790
Other non-current liabilities	10,512	15,620
Non-current liabilities of discontinued operations	197	0
Total liabilities	635,997	501,774
(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	380	390
Additional paid-in capital	236,128	257,209
Retained earnings	470,808	426,457
Accumulated other comprehensive income	2,052	15,260
Total stockholders’ equity	709,368	699,316
Non-controlling interests	17,553	16,804
Total equity	726,921	716,120
Total Liabilities and Equity	$1,362,918	$1,217,894

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2013	Dec. 31, 2012
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)	37,983,114	38,952,561
Common stock, shares outstanding (in Shares)	37,983,114	38,952,561

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, 2010

$626,707

'

'

$392

'

'

$251,578

'

'

$347,249

'

'

$18,113

'

'

$9,375

'

'

Balance (in Shares) at Dec. 31, 2010

39,246,015

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income

27,670

'

'

0

'

'

0

'

'

26,547

'

'

0

'

'

1,123

'

'

Issuance of common stock upon stock option exercises, including tax benefit

3,611

'

'

1

'

'

3,610

'

'

0

'

'

0

'

'

0

'

'

Issuance of common stock upon stock option exercises, including tax benefit (in shares)

128,052

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

New shares issued

4,000

'

'

2

'

'

3,998

'

'

0

'

'

0

'

'

0

'

'

New shares issued (in shares)

246,760

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted shares issued

'

2

0

'

2

0

'

0

0

'

0

0

'

0

0

'

0

0

Restricted shares issued (in Shares)

'

168,018

9,934

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of shares pursuant to deferred stock unit awards (in Shares)

20,640

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeitures of restricted shares

0

'

'

0

'

'

0

'

'

0

'

'

0

'

'

0

'

'

Forfeitures of restricted shares (in Shares)

-140,448

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repurchase of common stock

-5,000

'

'

-3

'

'

-4,997

'

'

0

'

'

0

'

'

0

'

'

Repurchase of common stock (in Shares)

-326,596

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity-based compensation expense

6,491

'

'

0

'

'

6,491

'

'

0

'

'

0

'

'

0

'

'

Investment by non-controlling interests

546

'

'

0

'

'

0

'

'

0

'

'

0

'

'

546

'

'

Distribution to non-controlling interests

1,661

'

'

0

'

'

0

'

'

0

'

'

0

'

'

1,661

'

'

Currency translation adjustment and derivative transactions, net

-13,377

'

'

0

'

'

0

'

'

0

'

'

-12,251

'

'

-1,126

'

'

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

'

'

Purchase of 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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:	'		'	'
Net income	$45,546		$56,849	$27,670
Loss from discontinued operations	6,461		1,713	587
Income from continuing operations	52,007		58,562	28,257
Adjustments to reconcile to net cash provided by operating activities:	'		'	'
Depreciation and amortization	40,329		37,658	35,532
Gain on sale of fixed assets	-816		-397	-373
Equity-based compensation expense	5,647		6,767	6,491
Deferred income taxes	-2,675		-3,004	-2,648
Equity in earnings of affiliated companies	-5,159	[1]	-6,359	-3,471
Debt Issuance Cost	1,964		0	0
Earnout reversal	-4,175		-10,019	-1,700
Gain on sale of interests in German joint venture	-11,771		0	0
Loss on foreign currency transactions	2,425		1,049	-1,155
Other	1,588		-4,793	-2,915
Changes in operating assets and liabilities (net of acquisitions):	'		'	'
Restricted cash	-102		-299	663
Return on equity of affiliated companies	10,691		11,034	7,018
Receivables net, retainage and costs and estimated earnings in excess of billings	8,222		7,875	-37,236
Inventories	-736		-3,376	-5,974
Prepaid expenses and other assets	-9,685		2,754	2,495
Accounts payable and accrued expenses	2,604		12,634	-789
Other operating	-2,293		865	-2,046
Net cash provided by operating activities of continuing operations	88,065		110,951	22,149
Net cash provided by (used in) operating activities of discontinued operations	-3,761		-230	735
Net cash provided by operating activities	84,304		110,721	22,884
Cash flows from investing activities:	'		'	'
Capital expenditures	-26,085		-44,738	-21,271
Proceeds from sale of fixed assets	3,435		4,401	755
Patent expenditures	-2,032		-552	-1,130
Sale of interests in German joint venture	18,300		0	0
Net cash used in investing activities of continuing operations	-150,145		-82,262	-165,780
Net cash provided by (used in) investing activities of discontinued operations	845		-1,156	-283
Net cash used in investing activities	-149,300		-83,418	-166,063
Cash flows from financing activities:	'		'	'
Proceeds from issuance of common stock upon stock option exercises, including tax effects	594		1,178	3,610
Issuance of common stock in connection with acquisition of Fyfe North America	0		0	4,000
Repurchase of common stock	-27,648		-12,308	-5,000
Investments from noncontrolling interests	0		4,939	546
Purchase of or distributions to noncontrolling interests	-287		-5	-1,661
Payment of earnout related to acquistion of CRTS, Inc.	-2,112		0	0
Credit facility financing fees	-5,013		0	-4,320
Proceeds on notes payable	1,541		7,160	354
Principal payments on notes payable	-183		-2,768	-1,499
Proceeds from line of credit	0		26,000	0
Proceeds from long-term debt	385,500		983	250,000
Principal payments on long-term debt	-253,500		-25,000	-103,750
Net cash provided by financing activities	98,892		179	142,280
Effect of exchange rate changes on cash	-9,527		65	-7,801
Net increaes (decrease) in cash and cash equivalents for the period	24,369		27,547	-8,700
Cash and cash equivalents, beginning of period	133,676		106,129	114,829
Cash and cash equivalents, end of period	158,045		133,676	106,129
Cash paid for:	'		'	'
Interest	8,700		7,945	17,231
Net income taxes paid	11,630		18,456	10,077
Brinderson LP [Member]	'		'	'
Cash flows from investing activities:	'		'	'
Purchase of business, net of cash acquired	-143,763		0	'
Fyfe LA [Member]	'		'	'
Cash flows from investing activities:	'		'	'
Purchase of business, net of cash acquired	0		-3,048	'
Fyfe Asia [Member]	'		'	'
Cash flows from investing activities:	'		'	'
Purchase of business, net of cash acquired	0		-38,841	'
Fyfe NA [Member]	'		'	'
Cash flows from investing activities:	'		'	'
Purchase of business, net of cash acquired	$0		$516	($144,134)
[1]	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: (i) to protect against the corrosion of industrial pipelines; (ii) to rehabilitate and strengthen water, wastewater, energy and mining piping systems and buildings, bridges, tunnels and waterfront structures; and (iii) to 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 opens 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 us 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 a 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 of commercial structures. 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 complementary acquisitions, the Company now possesses one of the broadest portfolios of cost-effective solutions for rehabilitating aging or deteriorating infrastructure and protecting new infrastructure from corrosion worldwide. Management believes the depth and breadth of its products and services within the Energy and Mining, Commercial and Structural and Water and Wastewater platforms make it a leading “one-stop” provider for the world’s infrastructure rehabilitation and protection needs.
	On October 25, 2011, Insituform Technologies, LLC (formerly known as Insituform Technologies, Inc. (“Insituform”)) reorganized by creating a new holding company structure (the “Corporate Reorganization”). The new parent company, Aegion Corporation (“Aegion” or the “Company”), includes Insituform as a direct, wholly-owned subsidiary. As part of the Corporate Reorganization, Insituform’s outstanding shares of common stock (and associated attached preferred stock rights) were automatically converted, on a share for share basis, into identical shares of Aegion common stock (and associated attached preferred stock rights).
	Upon effectiveness of the Corporate Reorganization, Aegion’s certificate of incorporation, bylaws, executive officers and board of directors were identical to Insituform’s in effect immediately prior to the Corporate Reorganization, and the rights, privileges and interests of Insituform’s former stockholders remained the same with respect to the new holding company. Additionally, as a result of the Corporate Reorganization, Aegion is deemed the successor registrant to Insituform under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and shares of Aegion common stock are deemed registered under Section 12(g) of the Exchange Act.
	Acquisitions/Strategic Initiatives/Divestitures
	Energy and Mining 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 was $147.6 million after preliminary working capital adjustments and an adjustment to account for cash held in the business at closing. The cash purchase price was funded by borrowings under the Company’s new $650.0 million senior secured credit facility as discussed in Note 5. 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.
	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 expects the cash liquidation value to approximate net asset value. Net asset value is determined using recorded amounts for assets and liabilities, which are based on Level 3 inputs as defined in Note 10. 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. Final liquidation of BWW’s assets is expected to occur by year-end 2014.
	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.
	In June 2011, the Company acquired all of the outstanding stock of CRTS, Inc. (“CRTS”). The purchase price at closing included a provision whereby CRTS shareholders would be able to earn up to an additional $15.0 million upon the achievement of certain performance targets over the three-year period ended December 31, 2013 (the “CRTS earnout”). During 2013, the Company paid $2.1 million to the sellers relating to a portion of the performance target being met for 2012. During 2013 and 2012, the Company also reversed $3.9 million and $8.2 million, respectively, related to the CRTS earnout, due to operating results being below the target amounts in the purchase agreement. As of December 31, 2013, the Company calculated the fair value of the contingent consideration arrangement to be $0.7 million, which is based on Level 3 inputs as defined in Note 10.
	On February 20, 2014, the Company received formal notice from its equity partner in Bayou Coating, L.L.C. (“Bayou Coating”), Stupp Brothers Inc. (“Stupp”), that Stupp is exercising its option to acquire the Company’s equity interests in Bayou Coating at forty-nine percent (49%) of the book value of Bayou Coating, as of December 31, 2013, with such book value to be determined on the basis of Bayou Coating’s federal information tax return for 2013. The Company currently expects this transaction to close on March 31, 2014. 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 The Bayou Companies, LLC (“Bayou”). The non-cash charge represents the Company’s current estimate of the difference between the carrying value of the investment on the balance sheet and the amount the Company will receive in connection with the exercise. The Company does not expect any additional material impacts to its consolidated balance sheet related to the consummation of Stupp’s exercise of this option.
	Through Bayou, the Company holds 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%) is currently held by Bayou Coating. As stated above, the Company currently holds through Bayou a forty-nine percent (49%) equity interest in Bayou Coating, but Stupp has exercised its option to acquire such forty-nine percent (49%) equity interest. The Company currently holds an option to acquire the forty-one percent (41%) interest in Bayou Delta and, on February 20, 2014, provided notice to Stupp regarding the Company's intent to exercise such option. The Company currently anticipates closing on the acquisition of such forty-one percent (41%) interest in Bayou Delta on March 31, 2014.
	International Water and Wastewater Segment
	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.
	Commercial and Structural Segment
	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 has been earned to date as the performance targets have not been 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 10.
	In August 2011, the Company purchased the North American business of Fyfe Group, LLC (“Fyfe NA”) for a purchase price at closing of $115.8 million (subject to working capital adjustments calculated from an agreed upon target), which was funded by borrowings under the Company’s credit facility. Fyfe NA, based in San Diego, California, is a pioneer and industry leader in the development, manufacture and installation of fiber reinforced polymer (FRP) systems for the structural repair, strengthening and restoration of pipelines (water, wastewater, oil and gas), buildings (commercial, federal, municipal, residential and parking structures), bridges and tunnels and waterfront structures. Fyfe NA has a comprehensive portfolio of patented and other proprietary technologies and products, including its Tyfo® Fibrwrap® System, the first fiber solution on the market that complies with 2009 International Building Code requirements. Fyfe NA’s product and service offering also includes pipeline rehabilitation, concrete repair, epoxy injection, corrosion mitigation and specialty coatings services. This purchase resulted in a new reportable segment for the Company, the Commercial and Structural segment.
	Purchase Price Accounting
	The Company accounts for its acquisitions in accordance with FASB ASC 805, Business Combinations. The Company records finite-lived intangible assets at their determined fair value related to customer relationships, backlog, trade names and trademarks and patents and other acquired technologies. The acquisitions generally result in goodwill related to, among other things, growth opportunities and synergies. The goodwill associated with the Brinderson acquisition is deductible for tax purposes. The Company completed its accounting for Fyfe LA and Fyfe Asia during the quarters ended December 31, 2012 and March 31, 2013, respectively, subject to final working capital adjustments and settlement of escrow accounts. At December 31, 2013, the Company substantially completed its accounting for Brinderson with the exception of final working capital adjustments. As the Company completes its final accounting for this acquisition, there might be changes, none of which are expected to be material to the financial statements.
	The Fyfe LA, Fyfe Asia and Brinderson acquisitions made the following contributions to the Company’s revenues and profits during the years ended December 31, 2013 and 2012 (in thousands):
		2013						2012
		Brinderson			Fyfe Asia/			Brinderson		Fyfe Asia/
					Fyfe LA					Fyfe LA
	Revenues	$	108,233		$	16,986		$	—	$	12,894
	Net income (1)	4,838			1,091			—		781
	_____________________
	(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 Fyfe LA, Fyfe Asia and Brinderson acquisitions had occurred at the beginning of the year preceding their acquisition (in thousands):
		Years Ended December 31,
		2013			2012
	Revenues	$	1,201,521		$	1,239,825
	Net income (1)	49,410			65,995
	_____________________
	(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.
	Total cash consideration recorded to acquire Fyfe Asia was $40.1 million. This amount included purchase price at closing of $40.7 million less a working capital adjustment of $0.6 million. The transaction purchase price to acquire Brinderson 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 following table summarizes the fair value of identified assets and liabilities of the Brinderson and Fyfe Asia acquisitions at their respective acquisition dates (in thousands):
		Brinderson			Fyfe Asia
	Cash	$	3,842		$	1,303
	Receivables and cost and estimated earnings in excess of billings	28,353			9,022
	Prepaid expenses and other current assets	655			1,262
	Property, plant and equipment	6,848			938
	Identified intangible assets	60,210			14,130
	Other assets	1,071			—
	Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	(16,122		)	(4,109		)
	Deferred tax liabilities	—			(2,410		)
	Total identifiable net assets	$	84,857		$	20,136
	Total consideration	$	147,605		$	40,144
	Less: total identifiable net assets	84,857			20,136
	Goodwill at December 31, 2013	$	62,748		$	20,008
	The following adjustments were made during the first quarter of 2013 relative to the acquisition of Fyfe Asia as the Company finalized its purchase price accounting, subject to final working capital adjustments and settlement of escrow accounts (in thousands):
	Total identifiable net assets at December 31, 2012	$	20,342
	Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	206
	Total identifiable net assets at December 31, 2013	$	20,136
	Goodwill at December 31, 2012	$	19,802
	Increase in goodwill related to acquisition	206
	Goodwill at December 31, 2013	$	20,008
	The following adjustments were made during the fourth quarter of 2013 relative to the acquisition of Brinderson as the Company substantially completed its purchase price accounting (in thousands):
	Total identifiable net assets at July 1, 2013	$	84,907
	Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	50
Total identifiable net assets at December 31, 2013	$	84,857
Goodwill at July 1, 2013	$	62,698
Increase in goodwill related to acquisition	50
Goodwill at December 31, 2013	$	62,748

Note_2_Accounting_Policies

Note 2 - Accounting Policies	12 Months Ended
	Dec. 31, 2013
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.
	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, 2013 and 2012, the Company had $0.6 million and $14.3 million, respectively, related to currency translation adjustments, $1.2 million and $0.8 million, respectively, related to derivative transactions and $0.2 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, $1.8 million and $2.2 million for the years ended December 31, 2013, 2012 and 2011, 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 8 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 7.
	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. During 2013, the Company recorded revenue related to claims in its discontinued operations, which has been determined to be probable and reasonably estimated. The amount of this revenue is immaterial to the Company’s consolidated financial statements. 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. 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. 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:
			2013	2012		2011
	Weighted average number of common shares used for basic EPS		38,692,658	39,222,737		39,362,138
	Effect of dilutive stock options and restricted and deferred stock unit awards		389,684	313,654		336,317
	Weighted average number of common shares and dilutive potential common stock used in dilutive EPS		39,082,342	39,536,391		39,698,455
	The Company excluded 318,026, 223,536 and 189,202 stock options in 2013, 2012 and 2011, 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 consists of 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 is similar to retainage and is therefore classified as a current asset, consistent with the Company’s policy on retainage.
	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 Energy and Mining 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, 2013, retainage receivables aged greater than 365 days approximated 12% 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.
	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 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. The Company did not identify any long-lived assets of its continuing operations as being impaired during 2013, 2012 or 2011.
	Goodwill
	Under FASB ASC 350, Intangibles – Goodwill and Other (“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. The annual assessment was last completed as of October 1, 2013. See Note 4 for additional information regarding goodwill by operating segment. Factors that could potentially trigger an interim impairment review include (but are not limited to):
	•	significant underperformance of a reporting unit relative to expected, historical or forecasted future operating results;
	•	significant negative industry or economic trends;
	•	significant changes in the strategy for a reporting unit including extended slowdowns in a segment’s market;
	•	a decrease in the Company’s market capitalization below its book value; and
	•	a significant change in regulations.
	In accordance with the provisions of FASB ASC 350, the Company determined the fair value of its reporting units at the annual impairment assessment date and compared such fair value to the carrying value of those reporting units to determine if there were any indications of goodwill impairment. For 2013, the Company’s reporting units for purposes of assessing goodwill were North American Water and Wastewater, European Water and Wastewater, Asia-Pacific Water and Wastewater, United Pipeline Systems, Bayou, Corrpro, CRTS, Brinderson and the Commercial and Structural group. For purposes of its goodwill testing in 2013, the Company had nine reporting units; however, it aggregated Fyfe North America, Fyfe Asia and Fyfe Latin America, which are all part of the Commercial and Structural reporting segment, to form a single reporting unit. During the Company’s annual impairment testing in 2013, it tested goodwill for impairment for all three Fyfe reporting units individually and in the aggregate, in addition to testing the goodwill associated with the other eight reporting units. There were no indications of impairment of goodwill noted during this testing. Going forward, the Company’s annual impairment test will be performed at the Commercial and Structural reporting unit level.
	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. Management believes this approach is appropriate because it provides a fair value estimate using multiples from entities with operations and economic characteristics comparable to the Company’s 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. Management 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. Management determines the appropriate discount rate for each of the Company’s 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 were adjusted, as appropriate, to account for company specific risk premiums. The discount rates used for calculating the fair values in our October 2013 goodwill review were commensurate with the risks associated with each reporting unit and ranged from 13.0% to 16.5%.
	Other significant assumptions used in the Company’s October 2013 goodwill review included: (i) annual revenue growth rates generally ranging from 2% to 17%; (ii) sustained or slightly increased gross margins; (iii) peer group EBITDA multiples; and (iv) terminal values for each reporting unit using a long-term growth rate of 1% to 3.5%. If actual results differ from estimates used in these calculations, we could incur future impairment charges.
	During the assessment of its reporting units’ fair values in relation to their respective carrying values, at the high end, five had a fair value in excess of 30% of their carrying value and, at the low end, two were within 10% percent of their carrying value. These two reporting units were Bayou and Fyfe North America, whose fair value exceeded their carrying value by 2.8% and 5.4%, respectively. Due to a lack of project activity available in the Gulf of Mexico market, customer-driven project delays and discontinued operations, the fair value of the Bayou reporting unit decreased $32.3 million, or 17.2%, from the prior year analysis. The impairment analysis includes an annual revenue growth rate of 10%; however, only a modest increase in revenue is contemplated in year one, but at a level that is still below our five-year average, and higher growth rates thereafter due to visibility of larger bidding opportunities in the Gulf of Mexico. The analysis also assumes a weighted average cost of capital of 13.5% and a long-term growth rate of 3%. For Fyfe North America, the values derived from both the income approach and market approach decreased from the prior year analysis; however, the overall fair value of the reporting unit increased 2.7% from the prior year due to a difference in working capital levels as of the valuation dates. The assumptions used in the impairment analysis include an annual revenue growth rate of 17%, due to the low revenue levels achieved in 2013, a weighted average cost of capital of 16.0% and a long-term growth rate of 3.5%. The total value of goodwill recorded at the impairment testing date for these two reporting units was $72.9 million.
	As with all of its reporting units, the Company continuously monitors potential triggering events that may cause an interim impairment valuation.
	Investments in Affiliated Companies
	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.
	The Company, through its subsidiary, Bayou, owns a forty-nine percent (49%) equity interest in Bayou Coating. Bayou Coating provides pipe coating services from its facility in Baton Rouge, Louisiana, and is adjacent to and services the Stupp pipe mill in Baton Rouge. See discussion of Bayou Coating in Note 1.
	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, 2013 and 2012, the investments in affiliated companies on the Company’s consolidated balance sheets were $9.1 million and $19.2 million, respectively.
	Net income presented below for the years ended December 31, 2013 and 2012 includes Bayou Coating’s forty-one percent (41%) interest in Delta Double Jointing, LLC (“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, 2013 and 2012 and for each of the years in the three-year period ended December 31, 2013 are summarized in the following tables (in thousands):
		December 31,
	Balance sheet data	2013		2012(1)
	Current assets	$	10,220	$	32,752
Non-current assets	10,022		22,495
Current liabilities	1,743		16,006
Non-current liabilities	—		484
Income statement data	2013 (1)		2012			2011
Revenue	$	89,157	$	141,233		$	134,716
Gross profit	27,336		40,342			29,651
Net income	17,946		22,009			12,512
Equity in earnings of affiliated companies	5,159		6,359			3,471
_____________________
(1)    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, 2013, the Company consolidated any VIEs in which it was the primary beneficiary. Also, as of December 31, 2013, the Company had significant interests in certain VIEs primarily through its joint venture arrangements for which the Company was not the primary beneficiary. Other than the sale of Insituform-Germany discussed in Note 1, there have been no changes in the status of the Company’s VIE or primary beneficiary designations during 2013.
Financial data for consolidated variable interest entities at December 31, 2013 and 2012 and for each of the years in the three-year period ended December 31, 2013 are summarized in the following tables (in thousands):
	December 31,
Balance sheet data	2013		2012
Current assets	$	55,651	$	65,251
Non-current assets	47,606		47,086
Current liabilities	33,886		45,604
Non-current liabilities	25,020		23,169
Income statement data	2013		2012			2011
Revenue	$	85,908	$	107,821		$	55,792
Gross profit	12,998		19,625			12,005
Net income	1,892		3,622			1,959
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 Adopted Accounting Pronouncements
ASU No. 2013-1 updates standard ASU No. 2011-11 and provides guidance to implement the balance sheet offsetting disclosures that require the presentation of gross and net information about transactions that are (1) offset in the financial statements or (2) subject to an enforceable master netting arrangement or similar agreement, regardless of whether the transactions are actually offset in the statement of financial position. The disclosure requirements are effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. Refer to Note 10 for discussion of the new accounting pronouncement.
ASU No. 2013-2 generally provides guidance to improve the reporting of reclassifications out of accumulated other comprehensive income to various components in the income statement. This standard requires an entity to present either parenthetically on the face of the financial statements or in the notes, significant amounts reclassified from each component of accumulated other comprehensive income and the income statement line items affected by the reclassification. ASU 2013-2 was effective for fiscal years, and interim periods within those years, beginning after December 15, 2012. The Company evaluated this pronouncement effective January 1, 2013 and determined reclassifications out of accumulated other comprehensive income to various components in the income statement is immaterial to the financial statements to the Company. Refer to Note 10 for discussion of the new accounting pronouncement.

Note_3_Supplemental_Balance_Sh

Note 3 - Supplemental Balance Sheet Information	12 Months Ended
	Dec. 31, 2013
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):
		2013			2012			2011
	Balance, at beginning of year	$	2,953		$	3,077		$	2,536
	Charged to expense	1,043			428			397
	Write-offs and adjustments	(555		)	(552		)	144
	Balance, at end of year	$	3,441		$	2,953		$	3,077
	Costs and Estimated Earnings on Uncompleted Contracts
	Costs and estimated earnings on uncompleted contracts consisted of the following at December 31 (in thousands):
		2013			2012
	Costs incurred on uncompleted contracts	$	740,403		$	664,662
	Estimated earnings to date	141,413			183,850
	Subtotal	881,816			848,512
	Less – billings to date	(826,795		)	(812,324		)
	Total	$	55,021		$	36,188
	Included in the accompanying balance sheets:
	Costs and estimated earnings in excess of billings	79,999			67,740
	Billings in excess of costs and estimated earnings	(24,978		)	(31,552		)
	Total	$	55,021		$	36,188
	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):
		2013			2012
	Raw materials and supplies	$	19,680		$	16,250
	Work-in-process	8,217			8,876
	Finished products	12,518			18,056
	Construction materials	18,353			15,941
	Total	$	58,768		$	59,123
	Property, Plant and Equipment
	Property, plant and equipment consisted of the following at December 31 (in thousands):
		Estimated Useful Lives (Years)			2013			2012
	Land and land improvements				$	11,964		$	11,437
	Buildings and improvements	5	—	40	63,870			64,604
	Machinery and equipment	4	—	10	185,307			177,383
	Furniture and fixtures	3	—	10	25,848			16,933
	Autos and trucks	3	—	10	52,145			50,119
	Construction in progress				31,012			35,507
	Subtotal				370,146			355,983
	Less – Accumulated depreciation				(187,843		)	(172,820		)
	Total				$	182,303		$	183,163
	Depreciation expense was $28.0 million, $27.1 million and $28.6 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	Accrued Expenses
	Accrued expenses consisted of the following at December 31 (in thousands):
		2013			2012
	Vendor and other accrued expenses	$	36,778		$	32,394
	Estimated casualty and healthcare liabilities	13,775			12,899
	Job costs	13,843			14,077
	Accrued compensation	15,942			12,943
	Income tax payable and deferred income taxes	10,628			7,267
	Total	$	90,966		$	79,580

Note_4_Goodwill_and_Intangible

Note 4 - Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2013
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, 2013 and December 31, 2013 (in millions):
		Energy				North American				International				Commercial				Total
		and				Water and				Water and				and Structural (3)
		Mining (1)(2)				Wastewater				Wastewater
	Beginning balance at January 1, 2013	$	76.7			$	101.9			$	28.1			$	65.6			$	272.3
	Additions to goodwill through acquisitions	62.7				—				—				0.2				62.9
	Foreign currency translation	(0.8		)		(0.3		)		0.4				(0.3		)		(1.0		)
	Goodwill at December 31, 2013	$	138.6			$	101.6			$	28.5			$	65.5			$	334.2
	__________________________
	(1)	During the second quarter of 2013, the Company approved a plan of liquidation with respect to BWW and, in connection therewith, recorded a write-down of the $1.4 million of goodwill associated with BWW, which operation now is reported as discontinued. Consequently, the goodwill associated with BWW is no longer included in this table. Additionally, all prior year balances have been retrospectively adjusted. For further information, see Note 11.
	(2)	During 2013, the Company recorded an increase of goodwill of $62.7 million related to the Brinderson acquisition.
	(3)	During 2013, the Company recorded an increase of goodwill of $0.2 million related to the Fyfe Asia acquisition.
	Intangible Assets
	Intangible assets at December 31, 2013 and 2012 were as follows (in thousands):
		As of December 31, 2013 (1)(2)														As of December 31, 2012
		Weighted Average Useful Lives (Years)		Gross Carrying Amount				Accumulated Amortization				Net Carrying Amount				Gross Carrying Amount				Accumulated Amortization			Net Carrying Amount
	License agreements	6		$	3,917			$	(2,977	)		$	940			$	3,925			$	(2,821	)	$	1,104
	Backlog	0		4,745				(4,745		)		—				4,756				(4,756		)	—
	Leases	13		2,067				(477		)		1,590				2,067				(331		)	1,736
	Trademarks	16		21,394				(4,167		)		17,227				21,290				(3,317		)	17,972
	Non-competes	5		1,140				(753		)		387				710				(710		)	—
	Customer relationships	14		182,703				(28,287		)		154,416				123,301				(18,912		)	104,389
	Patents and acquired technology	17		57,419				(22,696		)		34,723				55,672				(21,244		)	34,428
				$	273,385			$	(64,102	)		$	209,283			$	211,721			$	(52,091	)	$	159,629
	__________________________
	(1)	During the second quarter of 2013, the Company approved a plan of liquidation with respect to BWW and, in connection therewith, recorded a write-down of the $2.5 million of intangible assets associated with BWW, which operation now is reported as discontinued. Consequently, the intangible assets and accumulated amortization associated with BWW are no longer included in this table. Additionally, all prior year balances have been retrospectively adjusted. For further information, see Note 11.
	(2)	During the third quarter of 2013, the Company recorded $59.8 million in customer relationships to be amortized over a weighted average life of 15 years and $0.4 million in non-compete agreements to be amortized over a weighted average life of 5 years related to the acquisition of Brinderson, as discussion in Note 1.
	Amortization expense was $12.2 million, $10.5 million and $6.9 million for the years ended December 31, 2013, 2012 and 2011, respectively. Estimated amortization expense by year is as follows (in thousands):
	2014		$	14,606
	2015		14,606
	2016		14,602
	2017		14,565
	2018		14,488

Note_5_LongTerm_Debt_and_Credi

Note 5 - Long-Term Debt and Credit Facility	12 Months Ended
	Dec. 31, 2013
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):
			2013		2012
	Term note, current annualized rate 2.21% due July 1, 2018		$	341,250	$	—
	Original term note, due August 31, 2016		—		218,750
	Line of credit, 2.17% in 2013 and 2.49% in 2012		35,500		26,000
	Other notes with interest rates from 3.3% to 6.5%		11,890		10,873
	Subtotal		388,640		255,623
	Less – Current maturities and notes payable		22,024		33,775
	Total		$	366,616	$	221,848
	Principal payments required to be made for each of the next five years are summarized as follows (in thousands):
	Year		Amount
	2014		$	22,024
	2015		31,131
	2016		30,625
	2017		40,500
	2018		264,360
	Total		$	388,640
	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. This Credit Facility replaced the Company’s $500.0 million credit facility entered into on August 31, 2011 (the “Old Credit Facility”).
	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, 2013 was approximately 2.68%.
	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 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, 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 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, $4.9 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.
	As of December 31, 2013, the Company had $18.2 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 $8.0 million was for letters of credit or bank guarantees of performance or payment obligations of foreign subsidiaries.
	The Company’s indebtedness at December 31, 2012 consisted of $218.8 million outstanding from an original $250.0 million term loan under the Old Credit Facility and $26.0 million on the line of credit under the Old Credit Facility. Additionally, the Company and Wasco Energy loaned Bayou Wasco $11.0 million for the purchase of capital assets in 2012, of which $5.5 million (representing funds loaned by Wasco Energy) was designated as third-party debt in the consolidated financial statements. 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. As of December 31, 2012, $4.1 million of the additional $6.2 million had been funded. As of December 31, 2012, $5.2 million of such total amount (representing funds loaned by Perma-Pipe Canada Inc.) was designated as third-party debt in the consolidated financial statements. The Company also held $0.1 million of third party notes and bank debt at December 31, 2012.
	At December 31, 2013 and 2012, the estimated fair value of the Company’s long-term debt was approximately $380.1 million and $253.6 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 10.
	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, 2013 was approximately 2.17%. 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. Subject to the specifically defined terms and methods of calculation as set forth in the Credit Facility’s credit agreement, 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 and will decrease periodically at scheduled reporting periods to not more that 3.50 to 1.00 beginning with the quarter ending June 30, 2014. At December 31, 2013, the Company’s consolidated financial leverage ratio was 2.73 to 1.00 and, using the Credit Facility defined income, the Company had the capacity to borrow up to approximately $145.2 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, 2013, the Company’s fixed charge ratio was 1.66 to 1.00.
	At December 31, 2013, 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, 2013
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity [Text Block]	'
	Share Repurchase Plan
	In December 2012, the Company’s Board of Directors authorized the repurchase of up to $5.0 million of the Company’s common stock to be made during 2013. This amount represented the then maximum open market repurchases authorized in any calendar year under the terms of the Old Credit Facility. In May 2013, the Company’s Board of Directors authorized the repurchase of up to an additional $10.0 million of the Company’s common stock to be made during the balance of the 2013 calendar year. The Company simultaneously executed an amendment to the Old Credit Facility to allow for this additional repurchase. In September 2013, in accordance with the new terms of the Credit Facility, the Company’s Board of Directors authorized the repurchase of up to an additional $10.0 million of the Company’s common stock to be made during the balance of the 2013 calendar year. This amount represented half of the potential maximum open market repurchases authorized in any calendar year under the terms of the Credit Facility given the covenants currently applicable to the Company. Once repurchased, the Company immediately retires the shares. Additionally, in February 2014, the Company’s Board of Directors authorized a repurchase of up to $20.0 million of the Company’s common stock to be made during 2014.
	In addition to the open market authorized repurchases, the Company can purchase up to $10.0 million 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.
	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 the three open market repurchase programs discussed above 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, 2013, there were 36,528 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, 2013, there were 653,065 options and 515,844 unvested shares of restricted stock and restricted stock units outstanding under the 2009 Employee Plan.
	At December 31, 2013, there were 437,362 options and 2,653 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, 2013, there were 87,337 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, 2013, there were 59,818 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, 2013, there were 67,300 deferred stock units outstanding under the 2001 Non-Employee Director Equity Plan.
	On April 14, 2008, the Company granted J. Joseph Burgess a non-qualified stock option to purchase 118,397 shares of the Company’s common stock, a performance-based award of 52,784 shares of restricted stock and a one-time award of 103,092 shares of restricted stock in connection with his appointment as the Company’s President and Chief Executive Officer. These awards were issued as “inducement grants” under the rules of the Nasdaq Global Select Market and, as such, were not issued pursuant to our 2006 Employee Plan. At December 31, 2013, there were 118,397 options outstanding with respect to such inducement grants.
	Activity and related expense associated with these plans are described in Note 7.

Note_7_Equitybased_Compensatio

Note 7 - Equity-based Compensation	12 Months Ended
	Dec. 31, 2013
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, 2013, 2012 and 2011 is as follows:
		For the Years Ended December 31,
		2013							2012					2011
		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	698,869			$	19.39			643,117			$	17.48	888,855		$	15.25
	Restricted shares awarded	435,025			24.09				239,523			18.07		168,018		26.41
	Restricted stock units awarded	112,401			25.11				222,379			18.11		6,768		26.6
	Restricted shares distributed	(274,784	)		19.04				(289,001	)		13.42		(270,142	)	13.38
	Restricted stock units distributed	(13,761	)		18.87				(15,177	)		14.32		(9,934	)	11.19
	Restricted shares forfeited	(236,388	)		23.1				(36,325	)		20.13		(140,448	)	22.97
	Restricted stock units forfeited	(166,337	)		19.55				(65,647	)		18.18		—		—
	Outstanding, end of period	555,025			$	22.79			698,869			$	19.39	643,117		$	17.48
	Expense associated with stock awards was $3.0 million, $4.0 million, and $3.7 million in 2013, 2012 and 2011, respectively. Unrecognized pre-tax expense of $7.5 million related to stock awards is expected to be recognized over the weighted average remaining service period of 1.9 years for awards outstanding at December 31, 2013.
	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, 2013, 2012 and 2011:
		For the Years Ended December 31,
		2013							2012					2011
		Deferred			Weighted				Deferred			Weighted		Deferred		Weighted
		Stock			Average				Stock			Average		Stock		Average
		Units			Award Date				Units			Award Date		Units		Award Date
					Fair Value							Fair Value				Fair Value
	Outstanding, beginning of period	181,518			$	19.06			173,916			$	20.12	163,318		$	19.43
	Awarded	39,966			22.33				41,734			17.78		31,238		23.75
	Shares distributed	(7,029	)		22.67				(34,132	)		22.9		(20,640	)	20.13
	Outstanding, end of period	214,455			$	19.56			181,518			$	19.06	173,916		$	20.12
	Expense associated with awards of deferred stock units was $0.9 million, $0.7 million and $0.7 million in 2013, 2012 and 2011, 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, 2013, 2012 and 2011 is as follows:
		Shares			Weighted				Shares			Weighted		Shares		Weighted
					Average							Average				Average
					Exercise							Exercise				Exercise
					Price							Price				Price
	Outstanding at January 1	1,216,809			$	18.46			1,107,712			$	18.98	1,198,516		$	18.42
	Granted	29,025			25.11				281,696			18.11		225,505		26.92
	Exercised	(29,511	)		20.14				(52,676	)		16.66		(128,052	)	16.48
	Canceled/Expired	(7,499	)		24.58				(119,923	)		23.21		(188,257	)	26.62
	Outstanding at December 31	1,208,824			$	18.54			1,216,809			$	18.46	1,107,712		$	18.98
	Exercisable at December 31	933,738			$	17.84			758,270			$	16.8	690,449		$	16.82
	In 2013, 2012 and 2011, the Company recorded expense of $1.7 million, $2.1 million and $2.0 million, respectively, related to stock option grants. Unrecognized pre-tax expense of $1.1 million related to stock option grants is expected to be recognized over the weighted average remaining contractual term of 1.4 years for awards outstanding at December 31, 2013.
	Financial data for stock option exercises are summarized in the following table (in thousands):
		Years Ended December 31,
		2013				2012				2011
	Amount collected from stock option exercises	$	738			$	1,054			$	3,205
	Total intrinsic value of stock option exercises	131				177				1,090
	Tax benefit (expense) of stock option exercises recorded in additional paid-in-capital	(55		)		66				115
	Aggregate intrinsic value of outstanding stock options	5,383				5,708				997
	Aggregate intrinsic value of exercisable stock options	4,695				4,601				763
	The intrinsic value calculations are based on the Company’s closing stock price of $21.89, $22.19 and $15.34 on December 31, 2013, 2012 and 2011, respectively. At December 31, 2013, 2.8 million and 0.2 million 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 2013, 2012 and 2011was 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.
		2013				2012				2011
		Range		Weighted Average		Range		Weighted Average		Range		Weighted Average
	Grant-date fair value	$12.92		$12.92		$8.14 - $8.19		$8.19		$11.61		$11.61
	Volatility	49.80%		49.80%		43.0% - 45.2%		45.10%		47.0% - 50.6%		50.40%
	Expected term (years)	7		7		7		7		7		7
	Dividend yield	—%		—%		—%		—%		—%		—%
Risk-free rate	1.10%		1.10%		1.0% - 1.5%		1.50%		2.3% - 3.0%		2.80%

Note_8_Taxes_on_Income_Tax_Ben

Note 8 - Taxes on Income (Tax Benefits)	12 Months Ended
	Dec. 31, 2013
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):
		2013			2012			2011
	Domestic	$	23,695		$	45,290		$	825
	Foreign	35,307			25,576			32,145
	Total	$	59,002		$	70,866		$	32,970
	Provisions (benefits) for taxes on income (tax benefit) from continuing operations consisted of the following components for the years ended December 31 (in thousands):
		2013			2012			2011
	Current:
	Federal	$	8,603		$	9,237		$	1,789
	Foreign	6,078			9,704			8,878
	State	527			995			423
	Subtotal	15,208			19,936			11,090
	Deferred:
	Federal	(2,075		)	(1,817		)	(2,064		)
	Foreign	(727		)	69			492
	State	(252		)	475			(1,334		)
	Subtotal	(3,054		)	(1,273		)	(2,906		)
	Total tax provision	$	12,154		$	18,663		$	8,184
	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):
		2013			2012			2011
	Income taxes at U.S. federal statutory tax rate	$	20,651		$	24,803		$	11,539
	Increase (decrease) in taxes resulting from:
	Change in the balance of the valuation allowance for deferred tax assets allocated to income tax expense	1,447			3,714			477
	State income taxes, net of federal income tax benefit	179			956			(547		)
	Transaction costs	—			509			574
	Meals and entertainment	1,034			962			570
	Changes in taxes previously accrued	(3,098		)	(2,422		)	263
	Foreign tax rate differences	(4,892		)	(4,236		)	(3,412		)
	Recognition of uncertain tax positions	(89		)	(800		)	(214		)
	Contingent consideration reversal	(1,461		)	(2,869		)	—
	Domestic Production Activities Deduction	(1,548		)	(1,440		)	(52		)
	Other matters	(69		)	(514		)	(1,014		)
	Total tax provision	$	12,154		$	18,663		$	8,184
	Effective tax rate	20.6		%	26.3		%	24.8		%
	Net deferred taxes consisted of the following at December 31 (in thousands):
		2013			2012
	Deferred income tax assets:
	Foreign tax credit carryforwards	$	535		$	88
	Net operating loss carryforwards	17,146			17,225
	Accrued expenses	13,517			10,443
	Other	8,158			8,394
	Total gross deferred income tax assets	39,356			36,150
	Less valuation allowance	(7,797		)	(6,574		)
	Net deferred income tax assets	31,559			29,576
	Deferred income tax liabilities:
	Property, plant and equipment	(12,901		)	(14,051		)
	Intangible assets	(34,983		)	(33,715		)
	Undistributed foreign earnings	(7,051		)	(7,051		)
	Other	(7,548		)	(8,579		)
	Total deferred income tax liabilities	(62,483		)	(63,396		)
	Net deferred income tax liabilities	$	(30,924	)	$	(33,820	)
	The Company’s tax assets and liabilities, netted by taxing location, are in the following captions in the balance sheets (in thousands):
		2013			2012
	Current deferred income tax assets, net	$	4,640		$	3,975
	Current deferred income tax liabilities, net	(4,304		)	(5,994		)
	Noncurrent deferred income tax assets, net	6,957			7,989
	Noncurrent deferred income tax liabilities, net	(38,217		)	(39,790		)
	Net deferred income tax liabilities	$	(30,924	)	$	(33,820	)
	The Company’s deferred tax assets at December 31, 2013 included $17.1 million in federal, state and foreign net operating loss (“NOL”) carryforwards. These NOLs include $7.2 million, which if not used will expire between the years 2014 and 2032, and $9.9 million that have no expiration dates. The Company also has foreign tax credit carryforwards of $0.5 million, which has no expiration date.
	For financial reporting purposes, a valuation allowance of $7.8 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, 2012 was $6.6 million relating to the same items described above. Activity in the valuation allowance is summarized as follows for the years ended December 31 (in thousands):
		2013			2012			2011
	Balance, at beginning of year	$	6,574		$	4,691		$	5,083
Additions	1,754			2,062			1,058
Reversals	(131		)	(191		)	(1,352		)
Other adjustments	(400		)	12			(98		)
Balance, at end of year	$	7,797		$	6,574		$	4,691
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 $291.4 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):
	2013			2012			2011
Balance at January 1,	$	3,170		$	1,050		$	1,672
Additions for tax positions of prior years related to acquisitions	—			3,145			—
Additions for tax positions of prior years	30			111			41
Reductions for tax positions of prior years	—			—			(238		)
Lapse in statute of limitations	(236		)	(1,162		)	(406		)
Foreign currency translation	(28		)	26			(19		)
Balance at December 31, total tax provision	$	2,936		$	3,170		$	1,050
The total amount of unrecognized tax benefits, if recognized, that would affect the effective tax rate was $0.8 million at December 31, 2013.
The Company recognizes interest and penalties, if any, related to unrecognized tax benefits in income tax expense. During the years ended December 31, 2013, 2012 and 2011, approximately $0.3 million, $0.6 million and $0.1 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 2014. 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 $0.3 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 2009.

Note_9_Commitments_and_Conting

Note 9 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
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, 2013, 2012 and 2011 was $19.5 million, $18.7 million and $21.3 million, respectively.
	At December 31, 2013, the future minimum lease payments required under the non-cancellable operating leases were as follows (in thousands):
	Year	Minimum Lease Payments
	2014	$	17,559
	2015	13,509
	2016	8,940
	2017	5,457
	2018	3,082
	Thereafter	2,721
	Total	$	51,268
	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.
	Purchase Commitments
	The Company had no material purchase commitments at December 31, 2013.
	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, 2013 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 $4.5 million, $3.7 million and $3.2 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	Certain foreign subsidiaries maintain various other defined contribution retirement plans. Company contributions to such plans for the years ended December 31, 2013, 2012 and 2011 were $1.2 million, $1.4 million and $1.2 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 $0.3 million and $0.6 million in 2013 and 2012, respectively. Both the pension expense and funding requirements for the years ended December 31, 2013 and 2012 were immaterial to the Company’s consolidated financial position and results of operations. The benefit obligation and plan assets at December 31, 2013 approximated $7.9 million and $9.6 million, respectively. The Company used a discount rate of 4.4% for the evaluation of the pension liability. The Company has recorded an asset associated with the overfunded status of this plan of approximately $1.7 million, which is included in other long-term assets on the consolidated balance sheet. The benefit obligation and plan assets at December 31, 2012 approximated $7.8 million and $9.1 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, 2013
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, 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, 2013, 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, 2013 was approximately 2.17%. 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-13				31-Dec-12
	Derivatives Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	24			$	—
			Total Assets		$	24			$	—
	Forward Currency Contracts		Accrued expenses		$	—			$	9
	Interest Rate Swaps		Other non-current liabilities		1,220				764
			Total Liabilities		$	1,220			$	773
	Derivatives Not Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	752			$	—
			Total Assets		$	752			$	—
	Forward Currency Contracts		Accrued Expenses		$	—			$	585
			Total Derivative Assets		$	776			$	—
			Total Derivative Liabilities		1,220				1,358
			Total Net Derivative Liability		$	444			$	1,358
	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-13				(Level 1)				(Level 2)		(Level 3)
	Assets:
	Forward Currency Contracts	$	776			$	—			$	776	$	—
	Total	$	776			$	—			$	776	$	—
	Liabilities:
	Interest Rate Swap	$	1,220			$	—			$	1,220	$	—
	Total	$	1,220			$	—			$	1,220	$	—
		Total Fair Value at				Quoted Prices in Active Markets for Identical Assets				Significant Observable Inputs		Significant Unobservable Inputs
		31-Dec-12				(Level 1)				(Level 2)		(Level 3)
	Liabilities:
	Forward Currency Contracts	$	594			$	—			$	594	$	—
	Interest Rate Swap	764				—				764		—
	Total	$	1,358			$	—			$	1,358	$	—
	The following table summarizes the Company’s derivative positions at December 31, 2013:
		Position		Notional				Weighted		Average
				Amount				Average		Exchange
								Remaining		Rate
								Maturity
								In Years
	Canadian Dollar/USD	Sell		$	10,208,460			0.2		1.06
	Singapore Dollar/USD	Sell		$	1,973,834			1		1.26
	Hong Kong Dollar/USD	Sell		$	1,558,146			1		7.75
	Australian Dollar/USD	Sell		$	3,030,088			1		0.87
	USD/British Pound	Sell		£	1,900,000			0.7		1.6533
	EURO/British Pound	Sell		£	8,000,000			0.5		0.8317
	Interest Rate Swap			$	170,625,000			2.6
	The Company had no transfers between Level 1, 2 or 3 inputs during 2013. Certain financial instruments are required to be recorded at fair value. Changes in assumptions or estimation methods could affect the fair value estimates; however, we do not believe any such changes would have a material impact on our financial condition, results of operations or cash flows. Other financial instruments including cash and cash equivalents and short-term borrowings, including notes payable, are recorded at cost, which approximates fair value, which are based on Level 2 inputs as previously defined.

Note_11_Discontinued_Operation

Note 11 - Discontinued Operations	12 Months Ended
	Dec. 31, 2013
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. 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 expects the cash liquidation value to approximate net asset value as shown in the table below. Net asset value is determined using recorded amounts for assets and liabilities, which are based on Level 3 inputs as defined in Note 10. 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. Final liquidation of BWW’s assets is expected to occur by year-end 2014.
	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):
		2013			2012			2011
	Revenues	$	9,763		$	11,132		$	12,819
	Gross profit (loss)	(4,255		)	(645		)	445
	Operating expenses	1,973			2,038			1,615
	Closure charges of welding business	5,019			—			—
	Operating loss	(11,247		)	2,683			(1,170		)
	Loss before tax benefits	(10,731		)	(2,904		)	(1,206		)
	Tax benefits	4,270			1,191			619
	Net loss	(6,461		)	(1,713		)	(587		)
	Balance sheet data for discontinued operations was as follows at December 31 (in thousands):
		2013			2012
	Restricted cash	$	1,193		$	1,192
	Receivables, net	4,038			4,380
	Costs and estimated earnings in excess of billings	4			2,775
	Inventories	—			386
	Prepaid expenses and other current assets	200			253
	Property, plant and equipment, less accumulated depreciation	1,118			2,803
	Other assets	1,803			4,021
	Total assets	$	8,356		$	15,810
	Accounts payable	$	2,050		$	3,225
	Accrued expenses	20			1,660
	Deferred tax liability	197			—
	Total liabilities	$	2,267		$	4,885

Note_12_Segment_and_Geographic

Note 12 - Segment and Geographic Information	12 Months Ended
	Dec. 31, 2013
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. Management organizes the Company around differences in products and services, as well as by geographic areas. Within the water and wastewater market, the Company operates in two distinct geographies: North America and internationally outside of North America. As such, the Company is organized into four reportable segments: Energy and Mining; North American Water and Wastewater; International Water and Wastewater; and Commercial and Structural. Each segment is regularly reviewed and evaluated separately.
	During the first quarter of 2013, the Company re-organized its Water and Wastewater businesses to bring all of its operations under one central leadership team. The Company hired a Senior Vice President - Global Water and Wastewater and a Vice President of International Water and Wastewater. The Vice President of International Water and Wastewater is responsible for the European Water and Wastewater operations as well as the Asia-Pacific Water and Wastewater operations and reports directly to the Senior Vice President - Global Water and Wastewater. In connection with this management re-organization, the Company combined its European Water and Wastewater and Asia-Pacific Water and Wastewater reportable segments into one reportable segment titled International Water and Wastewater.
	During the third quarter of 2013, the Company acquired Brinderson. Brinderson is a leading integrated service provider of maintenance, construction, engineering and turnaround activities for the upstream and downstream oil and gas markets. For reportable segment purposes, management reports Brinderson in the Company’s Energy and Mining segment.
	The year ended December 31, 2013 results include $5.8 million for costs incurred related to the Company’s 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 year ended December 31, 2011 results include $6.4 million for costs incurred related to the acquisitions of CRTS, Hockway and Fyfe NA. The Company recorded these costs under “Acquisition-related expenses” on its consolidated statements of operations. Additionally, the year ended December 31, 2011 results include $2.2 million for restructuring charges. The Company recorded these charges under “Restructuring charges” 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):
		2013			2012			2011
	Revenues:
	Energy and Mining	$	562,119		$	513,975		$	420,411
	North American Water and Wastewater	359,536			317,338			357,507
	International Water and Wastewater	109,602			111,035			130,734
	Commercial and Structural	60,163			74,483			17,114
	Total revenues	$	1,091,420		$	1,016,831		$	925,766
	Operating income (loss):
	Energy and Mining	$	38,395		$	59,994		$	36,181
	North American Water and Wastewater	33,029			22,057			6,749
	International Water and Wastewater	208			(9,384		)	3,488
	Commercial and Structural	(4,750		)	9,136			(711		)
	Total operating income	$	66,882		$	81,803		$	45,707
	Total assets:
	Energy and Mining	$	723,468		$	569,109		$	465,792
	North American Water and Wastewater	263,173			268,097			281,353
	International Water and Wastewater	112,546			120,466			139,723
	Commercial and Structural	139,058			142,561			128,358
	Corporate	116,317			101,851			96,336
	Discontinued Operations	8,356			15,810			13,402
	Total assets	$	1,362,918		$	1,217,894		$	1,124,964
	Capital expenditures:
	Energy and Mining	$	15,367		$	34,796		$	11,092
	North American Water and Wastewater	4,858			3,023			3,378
	International Water and Wastewater	3,500			4,382			3,706
	Commercial and Structural	470			443			43
	Corporate	1,890			2,094			3,052
	Total capital expenditures	$	26,085		$	44,738		$	21,271
	Depreciation and amortization:
	Energy and Mining	$	21,954		$	18,175		$	16,106
	North American Water and Wastewater	8,398			8,886			9,405
	International Water and Wastewater	4,304			4,405			4,735
	Commercial and Structural	3,850			4,509			1,183
	Corporate	1,823			1,683			4,103
	Total depreciation and amortization	$	40,329		$	37,658		$	35,532
	The following table summarizes revenues, gross profit and operating income (loss) by geographic region (in thousands):
		2013			2012			2011
	Revenues:
	United States	$	672,192		$	589,027		$	539,378
	Canada	179,236			180,283			178,739
	Europe	90,646			86,883			102,471
	Other foreign	149,346			160,638			105,178
	Total revenues	$	1,091,420		$	1,016,831		$	925,766
	Operating income (loss):
	United States	$	24,977		$	40,676		$	(1,042	)
	Canada	28,955			31,376			31,892
	Europe	6,276			6,196			9,391
	Other foreign	6,674			3,555			5,466
	Total operating income	$	66,882		$	81,803		$	45,707
	Long-lived assets: (1)
	United States	$	154,367		$	151,337		$	144,151
	Canada	28,539			28,724			22,998
	Europe	10,007			16,396			12,474
	Other foreign	12,806			14,040			12,693
	Total long-lived assets	$	205,719		$	210,497		$	192,316
	__________________________
(1) Long-lived assets as of December 31, 2013, 2012 and 2011 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, 2013
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, 2013 and 2012 (in thousands, except per share data):
		First			Second			Third			Fourth
		Quarter			Quarter			Quarter(1)			Quarter(1)
	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	$	0.1		$	0.47		$	0.37		$	0.38
	Loss from discontinued operations	(0.03		)	(0.13		)	(0.01		)	0
	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	(0.03		)	(0.13		)	(0.01		)	0
	Net income	$	0.06		$	0.34		$	0.36		$	0.37
	____________________
	(1)    Includes the financial results of Brinderson, which was acquired in July 2013.
		First			Second			Third			Fourth
		Quarter			Quarter(2)			Quarter(2)			Quarter(2)
	Year ended December 31, 2012:
	Revenues	$	227,879		$	254,490		$	262,867		$	271,595
	Gross profit	52,572			62,219			62,931			66,032
	Operating income	11,187			18,654			26,865			25,097
	Income from continuing operations	7,342			12,191			21,170			17,859
	Loss from discontinued operations	(192		)	(253		)	(435		)	(833		)
	Net income	7,150			11,938			20,735			17,026
	Basic earnings per share:
	Income from continuing operations	$	0.17		$	0.3		$	0.51		$	0.4
	Loss from discontinued operations	0			(0.01		)	(0.01		)	(0.02		)
	Net income	$	0.17		$	0.29		$	0.5		$	0.38
	Diluted earnings per share
	Income from continuing operations	$	0.17		$	0.3		$	0.5		$	0.4
	Loss from discontinued operations	0			(0.01		)	(0.01		)	(0.02		)
	Net income	$	0.17		$	0.29		$	0.49		$	0.38
	____________________
	(2)    Includes the financial results of Fyfe Asia, which was acquired in April 2012.

Note_2_Accounting_Policies_Pol

Note 2 - Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
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.
	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, 2013 and 2012, the Company had $0.6 million and $14.3 million, respectively, related to currency translation adjustments, $1.2 million and $0.8 million, respectively, related to derivative transactions and $0.2 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, $1.8 million and $2.2 million for the years ended December 31, 2013, 2012 and 2011, 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 8 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 7.
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. During 2013, the Company recorded revenue related to claims in its discontinued operations, which has been determined to be probable and reasonably estimated. The amount of this revenue is immaterial to the Company’s consolidated financial statements. 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. 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. 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:
			2013	2012		2011
	Weighted average number of common shares used for basic EPS		38,692,658	39,222,737		39,362,138
	Effect of dilutive stock options and restricted and deferred stock unit awards		389,684	313,654		336,317
	Weighted average number of common shares and dilutive potential common stock used in dilutive EPS		39,082,342	39,536,391		39,698,455
	The Company excluded 318,026, 223,536 and 189,202 stock options in 2013, 2012 and 2011, 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 consists of 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 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 Energy and Mining 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, 2013, retainage receivables aged greater than 365 days approximated 12% 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 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. The Company did not identify any long-lived assets of its continuing operations as being impaired during 2013, 2012 or 2011.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	'
	Goodwill
	Under FASB ASC 350, Intangibles – Goodwill and Other (“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. The annual assessment was last completed as of October 1, 2013. See Note 4 for additional information regarding goodwill by operating segment. Factors that could potentially trigger an interim impairment review include (but are not limited to):
	•	significant underperformance of a reporting unit relative to expected, historical or forecasted future operating results;
	•	significant negative industry or economic trends;
	•	significant changes in the strategy for a reporting unit including extended slowdowns in a segment’s market;
	•	a decrease in the Company’s market capitalization below its book value; and
	•	a significant change in regulations.
	In accordance with the provisions of FASB ASC 350, the Company determined the fair value of its reporting units at the annual impairment assessment date and compared such fair value to the carrying value of those reporting units to determine if there were any indications of goodwill impairment. For 2013, the Company’s reporting units for purposes of assessing goodwill were North American Water and Wastewater, European Water and Wastewater, Asia-Pacific Water and Wastewater, United Pipeline Systems, Bayou, Corrpro, CRTS, Brinderson and the Commercial and Structural group. For purposes of its goodwill testing in 2013, the Company had nine reporting units; however, it aggregated Fyfe North America, Fyfe Asia and Fyfe Latin America, which are all part of the Commercial and Structural reporting segment, to form a single reporting unit. During the Company’s annual impairment testing in 2013, it tested goodwill for impairment for all three Fyfe reporting units individually and in the aggregate, in addition to testing the goodwill associated with the other eight reporting units. There were no indications of impairment of goodwill noted during this testing. Going forward, the Company’s annual impairment test will be performed at the Commercial and Structural reporting unit level.
	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. Management believes this approach is appropriate because it provides a fair value estimate using multiples from entities with operations and economic characteristics comparable to the Company’s 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. Management 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. Management determines the appropriate discount rate for each of the Company’s 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 were adjusted, as appropriate, to account for company specific risk premiums. The discount rates used for calculating the fair values in our October 2013 goodwill review were commensurate with the risks associated with each reporting unit and ranged from 13.0% to 16.5%.
	Other significant assumptions used in the Company’s October 2013 goodwill review included: (i) annual revenue growth rates generally ranging from 2% to 17%; (ii) sustained or slightly increased gross margins; (iii) peer group EBITDA multiples; and (iv) terminal values for each reporting unit using a long-term growth rate of 1% to 3.5%. If actual results differ from estimates used in these calculations, we could incur future impairment charges.
	During the assessment of its reporting units’ fair values in relation to their respective carrying values, at the high end, five had a fair value in excess of 30% of their carrying value and, at the low end, two were within 10% percent of their carrying value. These two reporting units were Bayou and Fyfe North America, whose fair value exceeded their carrying value by 2.8% and 5.4%, respectively. Due to a lack of project activity available in the Gulf of Mexico market, customer-driven project delays and discontinued operations, the fair value of the Bayou reporting unit decreased $32.3 million, or 17.2%, from the prior year analysis. The impairment analysis includes an annual revenue growth rate of 10%; however, only a modest increase in revenue is contemplated in year one, but at a level that is still below our five-year average, and higher growth rates thereafter due to visibility of larger bidding opportunities in the Gulf of Mexico. The analysis also assumes a weighted average cost of capital of 13.5% and a long-term growth rate of 3%. For Fyfe North America, the values derived from both the income approach and market approach decreased from the prior year analysis; however, the overall fair value of the reporting unit increased 2.7% from the prior year due to a difference in working capital levels as of the valuation dates. The assumptions used in the impairment analysis include an annual revenue growth rate of 17%, due to the low revenue levels achieved in 2013, a weighted average cost of capital of 16.0% and a long-term growth rate of 3.5%. The total value of goodwill recorded at the impairment testing date for these two reporting units was $72.9 million.
	As with all of its reporting units, the Company continuously monitors potential triggering events that may cause an interim impairment valuation.
Equity Method Investments, Policy [Policy Text Block]	'
	Investments in Affiliated Companies
	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.
	The Company, through its subsidiary, Bayou, owns a forty-nine percent (49%) equity interest in Bayou Coating. Bayou Coating provides pipe coating services from its facility in Baton Rouge, Louisiana, and is adjacent to and services the Stupp pipe mill in Baton Rouge. See discussion of Bayou Coating in Note 1.
	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, 2013 and 2012, the investments in affiliated companies on the Company’s consolidated balance sheets were $9.1 million and $19.2 million, respectively.
	Net income presented below for the years ended December 31, 2013 and 2012 includes Bayou Coating’s forty-one percent (41%) interest in Delta Double Jointing, LLC (“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, 2013 and 2012 and for each of the years in the three-year period ended December 31, 2013 are summarized in the following tables (in thousands):
		December 31,
	Balance sheet data	2013		2012(1)
	Current assets	$	10,220	$	32,752
	Non-current assets	10,022		22,495
	Current liabilities	1,743		16,006
	Non-current liabilities	—		484
	Income statement data	2013 (1)		2012			2011
	Revenue	$	89,157	$	141,233		$	134,716
	Gross profit	27,336		40,342			29,651
	Net income	17,946		22,009			12,512
	Equity in earnings of affiliated companies	5,159		6,359			3,471
	_____________________
	(1)    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, 2013, the Company consolidated any VIEs in which it was the primary beneficiary. Also, as of December 31, 2013, the Company had significant interests in certain VIEs primarily through its joint venture arrangements for which the Company was not the primary beneficiary. Other than the sale of Insituform-Germany discussed in Note 1, there have been no changes in the status of the Company’s VIE or primary beneficiary designations during 2013.
	Financial data for consolidated variable interest entities at December 31, 2013 and 2012 and for each of the years in the three-year period ended December 31, 2013 are summarized in the following tables (in thousands):
		December 31,
	Balance sheet data	2013		2012
	Current assets	$	55,651	$	65,251
	Non-current assets	47,606		47,086
	Current liabilities	33,886		45,604
	Non-current liabilities	25,020		23,169
	Income statement data	2013		2012			2011
	Revenue	$	85,908	$	107,821		$	55,792
	Gross profit	12,998		19,625			12,005
	Net income	1,892		3,622			1,959
	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 Adopted Accounting Pronouncements
	ASU No. 2013-1 updates standard ASU No. 2011-11 and provides guidance to implement the balance sheet offsetting disclosures that require the presentation of gross and net information about transactions that are (1) offset in the financial statements or (2) subject to an enforceable master netting arrangement or similar agreement, regardless of whether the transactions are actually offset in the statement of financial position. The disclosure requirements are effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. Refer to Note 10 for discussion of the new accounting pronouncement.
	ASU No. 2013-2 generally provides guidance to improve the reporting of reclassifications out of accumulated other comprehensive income to various components in the income statement. This standard requires an entity to present either parenthetically on the face of the financial statements or in the notes, significant amounts reclassified from each component of accumulated other comprehensive income and the income statement line items affected by the reclassification. ASU 2013-2 was effective for fiscal years, and interim periods within those years, beginning after December 15, 2012. The Company evaluated this pronouncement effective January 1, 2013 and determined reclassifications out of accumulated other comprehensive income to various components in the income statement is immaterial to the financial statements to the Company. Refer to Note 10 for discussion of the new accounting pronouncement.

Note_1_Description_of_Business1

Note 1 - Description of Business (Tables)	12 Months Ended
	Dec. 31, 2013
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 and Fyfe Asia acquisitions at their respective acquisition dates (in thousands):
		Brinderson			Fyfe Asia
	Cash	$	3,842		$	1,303
	Receivables and cost and estimated earnings in excess of billings	28,353			9,022
	Prepaid expenses and other current assets	655			1,262
	Property, plant and equipment	6,848			938
	Identified intangible assets	60,210			14,130
	Other assets	1,071			—
	Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	(16,122		)	(4,109		)
	Deferred tax liabilities	—			(2,410		)
	Total identifiable net assets	$	84,857		$	20,136
	Total consideration	$	147,605		$	40,144
	Less: total identifiable net assets	84,857			20,136
	Goodwill at December 31, 2013	$	62,748		$	20,008
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 Fyfe LA, Fyfe Asia and Brinderson acquisitions had occurred at the beginning of the year preceding their acquisition (in thousands):
		Years Ended December 31,
		2013			2012
	Revenues	$	1,201,521		$	1,239,825
	Net income (1)	49,410			65,995
	_____________________
	(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 Fyfe LA, Fyfe Asia and Brinderson acquisitions made the following contributions to the Company’s revenues and profits during the years ended December 31, 2013 and 2012 (in thousands):
		2013						2012
		Brinderson			Fyfe Asia/			Brinderson		Fyfe Asia/
					Fyfe LA					Fyfe LA
	Revenues	$	108,233		$	16,986		$	—	$	12,894
	Net income (1)	4,838			1,091			—		781
	_____________________
	(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 adjustments were made during the fourth quarter of 2013 relative to the acquisition of Brinderson as the Company substantially completed its purchase price accounting (in thousands):
	Total identifiable net assets at July 1, 2013	$	84,907
	Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	50
	Total identifiable net assets at December 31, 2013	$	84,857
	Goodwill at July 1, 2013	$	62,698
	Increase in goodwill related to acquisition	50
	Goodwill at December 31, 2013	$	62,748
Fyfe Asia [Member]	'
General [Line Items]	'
Schedule of Purchase Accounting Adjustments [Table Text Block]	'
	The following adjustments were made during the first quarter of 2013 relative to the acquisition of Fyfe Asia as the Company finalized its purchase price accounting, subject to final working capital adjustments and settlement of escrow accounts (in thousands):
	Total identifiable net assets at December 31, 2012	$	20,342
	Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	206
	Total identifiable net assets at December 31, 2013	$	20,136
	Goodwill at December 31, 2012	$	19,802
	Increase in goodwill related to acquisition	206
	Goodwill at December 31, 2013	$	20,008

Note_2_Accounting_Policies_Tab

Note 2 - Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
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:
			2013	2012		2011
	Weighted average number of common shares used for basic EPS		38,692,658	39,222,737		39,362,138
	Effect of dilutive stock options and restricted and deferred stock unit awards		389,684	313,654		336,317
	Weighted average number of common shares and dilutive potential common stock used in dilutive EPS		39,082,342	39,536,391		39,698,455
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, 2013 and 2012 and for each of the years in the three-year period ended December 31, 2013 are summarized in the following tables (in thousands):
		December 31,
	Balance sheet data	2013		2012(1)
	Current assets	$	10,220	$	32,752
	Non-current assets	10,022		22,495
	Current liabilities	1,743		16,006
	Non-current liabilities	—		484
Schedule of Variable Interest Entities [Table Text Block]	'
	Financial data for consolidated variable interest entities at December 31, 2013 and 2012 and for each of the years in the three-year period ended December 31, 2013 are summarized in the following tables (in thousands):
		December 31,
	Balance sheet data	2013		2012
	Current assets	$	55,651	$	65,251
	Non-current assets	47,606		47,086
	Current liabilities	33,886		45,604
	Non-current liabilities	25,020		23,169
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	2013 (1)		2012			2011
	Revenue	$	89,157	$	141,233		$	134,716
	Gross profit	27,336		40,342			29,651
	Net income	17,946		22,009			12,512
	Equity in earnings of affiliated companies	5,159		6,359			3,471
	_____________________
	(1)    Includes the financial data of Insituform-Germany through the date of its sale in June 2013.
Schedule of Variable Interest Entities [Table Text Block]	'
	Income statement data	2013		2012			2011
	Revenue	$	85,908	$	107,821		$	55,792
	Gross profit	12,998		19,625			12,005
	Net income	1,892		3,622			1,959

Note_3_Supplemental_Balance_Sh1

Note 3 - Supplemental Balance Sheet Information (Tables)	12 Months Ended
	Dec. 31, 2013
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):
		2013			2012			2011
	Balance, at beginning of year	$	2,953		$	3,077		$	2,536
	Charged to expense	1,043			428			397
	Write-offs and adjustments	(555		)	(552		)	144
	Balance, at end of year	$	3,441		$	2,953		$	3,077
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):
		2013			2012
	Costs incurred on uncompleted contracts	$	740,403		$	664,662
	Estimated earnings to date	141,413			183,850
	Subtotal	881,816			848,512
	Less – billings to date	(826,795		)	(812,324		)
	Total	$	55,021		$	36,188
	Included in the accompanying balance sheets:
	Costs and estimated earnings in excess of billings	79,999			67,740
	Billings in excess of costs and estimated earnings	(24,978		)	(31,552		)
	Total	$	55,021		$	36,188
Schedule of Inventory, Current [Table Text Block]	'
	Inventories are summarized as follows at December 31 (in thousands):
		2013			2012
	Raw materials and supplies	$	19,680		$	16,250
	Work-in-process	8,217			8,876
	Finished products	12,518			18,056
	Construction materials	18,353			15,941
	Total	$	58,768		$	59,123
Property, Plant and Equipment [Table Text Block]	'
	Property, plant and equipment consisted of the following at December 31 (in thousands):
		Estimated Useful Lives (Years)			2013			2012
	Land and land improvements				$	11,964		$	11,437
	Buildings and improvements	5	—	40	63,870			64,604
	Machinery and equipment	4	—	10	185,307			177,383
	Furniture and fixtures	3	—	10	25,848			16,933
	Autos and trucks	3	—	10	52,145			50,119
	Construction in progress				31,012			35,507
	Subtotal				370,146			355,983
	Less – Accumulated depreciation				(187,843		)	(172,820		)
	Total				$	182,303		$	183,163
Schedule of Accrued Liabilities [Table Text Block]	'
	Accrued expenses consisted of the following at December 31 (in thousands):
		2013			2012
	Vendor and other accrued expenses	$	36,778		$	32,394
	Estimated casualty and healthcare liabilities	13,775			12,899
	Job costs	13,843			14,077
	Accrued compensation	15,942			12,943
	Income tax payable and deferred income taxes	10,628			7,267
	Total	$	90,966		$	79,580

Note_4_Goodwill_and_Intangible1

Note 4 - Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill [Table Text Block]	'
		Energy				North American				International				Commercial				Total
		and				Water and				Water and				and Structural (3)
		Mining (1)(2)				Wastewater				Wastewater
	Beginning balance at January 1, 2013	$	76.7			$	101.9			$	28.1			$	65.6			$	272.3
	Additions to goodwill through acquisitions	62.7				—				—				0.2				62.9
	Foreign currency translation	(0.8		)		(0.3		)		0.4				(0.3		)		(1.0		)
	Goodwill at December 31, 2013	$	138.6			$	101.6			$	28.5			$	65.5			$	334.2
	__________________________
	(1)	During the second quarter of 2013, the Company approved a plan of liquidation with respect to BWW and, in connection therewith, recorded a write-down of the $1.4 million of goodwill associated with BWW, which operation now is reported as discontinued. Consequently, the goodwill associated with BWW is no longer included in this table. Additionally, all prior year balances have been retrospectively adjusted. For further information, see Note 11.
	(2)	During 2013, the Company recorded an increase of goodwill of $62.7 million related to the Brinderson acquisition.
	(3)	During 2013, the Company recorded an increase of goodwill of $0.2 million related to the Fyfe Asia acquisition.
Schedule of Finite-Lived Intangible Assets [Table Text Block]	'
	Intangible assets at December 31, 2013 and 2012 were as follows (in thousands):
		As of December 31, 2013 (1)(2)														As of December 31, 2012
		Weighted Average Useful Lives (Years)		Gross Carrying Amount				Accumulated Amortization				Net Carrying Amount				Gross Carrying Amount				Accumulated Amortization			Net Carrying Amount
	License agreements	6		$	3,917			$	(2,977	)		$	940			$	3,925			$	(2,821	)	$	1,104
	Backlog	0		4,745				(4,745		)		—				4,756				(4,756		)	—
	Leases	13		2,067				(477		)		1,590				2,067				(331		)	1,736
	Trademarks	16		21,394				(4,167		)		17,227				21,290				(3,317		)	17,972
	Non-competes	5		1,140				(753		)		387				710				(710		)	—
	Customer relationships	14		182,703				(28,287		)		154,416				123,301				(18,912		)	104,389
	Patents and acquired technology	17		57,419				(22,696		)		34,723				55,672				(21,244		)	34,428
				$	273,385			$	(64,102	)		$	209,283			$	211,721			$	(52,091	)	$	159,629
	__________________________
	(1)	During the second quarter of 2013, the Company approved a plan of liquidation with respect to BWW and, in connection therewith, recorded a write-down of the $2.5 million of intangible assets associated with BWW, which operation now is reported as discontinued. Consequently, the intangible assets and accumulated amortization associated with BWW are no longer included in this table. Additionally, all prior year balances have been retrospectively adjusted. For further information, see Note 11.
	(2)	During the third quarter of 2013, the Company recorded $59.8 million in customer relationships to be amortized over a weighted average life of 15 years and $0.4 million in non-compete agreements to be amortized over a weighted average life of 5 years related to the acquisition of Brinderson, as discussion in Note 1.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	'
	Estimated amortization expense by year is as follows (in thousands):
	2014		$	14,606
	2015		14,606
	2016		14,602
	2017		14,565
	2018		14,488

Note_5_LongTerm_Debt_and_Credi1

Note 5 - Long-Term Debt and Credit Facility (Tables)	12 Months Ended
	Dec. 31, 2013
Schedule of Long-Term Debt [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):
		2013		2012
	Term note, current annualized rate 2.21% due July 1, 2018	$	341,250	$	—
	Original term note, due August 31, 2016	—		218,750
	Line of credit, 2.17% in 2013 and 2.49% in 2012	35,500		26,000
	Other notes with interest rates from 3.3% to 6.5%	11,890		10,873
	Subtotal	388,640		255,623
	Less – Current maturities and notes payable	22,024		33,775
	Total	$	366,616	$	221,848
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
	2014	$	22,024
	2015	31,131
	2016	30,625
	2017	40,500
	2018	264,360
	Total	$	388,640

Note_7_Equitybased_Compensatio1

Note 7 - Equity-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013, 2012 and 2011 is as follows:
		For the Years Ended December 31,
		2013							2012					2011
		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	698,869			$	19.39			643,117			$	17.48	888,855		$	15.25
	Restricted shares awarded	435,025			24.09				239,523			18.07		168,018		26.41
	Restricted stock units awarded	112,401			25.11				222,379			18.11		6,768		26.6
	Restricted shares distributed	(274,784	)		19.04				(289,001	)		13.42		(270,142	)	13.38
	Restricted stock units distributed	(13,761	)		18.87				(15,177	)		14.32		(9,934	)	11.19
	Restricted shares forfeited	(236,388	)		23.1				(36,325	)		20.13		(140,448	)	22.97
	Restricted stock units forfeited	(166,337	)		19.55				(65,647	)		18.18		—		—
	Outstanding, end of period	555,025			$	22.79			698,869			$	19.39	643,117		$	17.48
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, 2013, 2012 and 2011:
		For the Years Ended December 31,
		2013							2012					2011
		Deferred			Weighted				Deferred			Weighted		Deferred		Weighted
		Stock			Average				Stock			Average		Stock		Average
		Units			Award Date				Units			Award Date		Units		Award Date
					Fair Value							Fair Value				Fair Value
	Outstanding, beginning of period	181,518			$	19.06			173,916			$	20.12	163,318		$	19.43
	Awarded	39,966			22.33				41,734			17.78		31,238		23.75
	Shares distributed	(7,029	)		22.67				(34,132	)		22.9		(20,640	)	20.13
	Outstanding, end of period	214,455			$	19.56			181,518			$	19.06	173,916		$	20.12
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	'
	A summary of stock option activity during the years ended December 31, 2013, 2012 and 2011 is as follows:
		Shares			Weighted				Shares			Weighted		Shares		Weighted
					Average							Average				Average
					Exercise							Exercise				Exercise
					Price							Price				Price
	Outstanding at January 1	1,216,809			$	18.46			1,107,712			$	18.98	1,198,516		$	18.42
	Granted	29,025			25.11				281,696			18.11		225,505		26.92
	Exercised	(29,511	)		20.14				(52,676	)		16.66		(128,052	)	16.48
	Canceled/Expired	(7,499	)		24.58				(119,923	)		23.21		(188,257	)	26.62
	Outstanding at December 31	1,208,824			$	18.54			1,216,809			$	18.46	1,107,712		$	18.98
	Exercisable at December 31	933,738			$	17.84			758,270			$	16.8	690,449		$	16.82
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,
		2013				2012				2011
	Amount collected from stock option exercises	$	738			$	1,054			$	3,205
	Total intrinsic value of stock option exercises	131				177				1,090
	Tax benefit (expense) of stock option exercises recorded in additional paid-in-capital	(55		)		66				115
	Aggregate intrinsic value of outstanding stock options	5,383				5,708				997
	Aggregate intrinsic value of exercisable stock options	4,695				4,601				763
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	'
		2013				2012				2011
		Range		Weighted Average		Range		Weighted Average		Range		Weighted Average
	Grant-date fair value	$12.92		$12.92		$8.14 - $8.19		$8.19		$11.61		$11.61
	Volatility	49.80%		49.80%		43.0% - 45.2%		45.10%		47.0% - 50.6%		50.40%
	Expected term (years)	7		7		7		7		7		7
	Dividend yield	—%		—%		—%		—%		—%		—%
	Risk-free rate	1.10%		1.10%		1.0% - 1.5%		1.50%		2.3% - 3.0%		2.80%

Note_8_Taxes_on_Income_Tax_Ben1

Note 8 - Taxes on Income (Tax Benefits) (Tables)	12 Months Ended
	Dec. 31, 2013
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):
		2013			2012			2011
	Domestic	$	23,695		$	45,290		$	825
	Foreign	35,307			25,576			32,145
	Total	$	59,002		$	70,866		$	32,970
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):
		2013			2012			2011
	Current:
	Federal	$	8,603		$	9,237		$	1,789
	Foreign	6,078			9,704			8,878
	State	527			995			423
	Subtotal	15,208			19,936			11,090
	Deferred:
	Federal	(2,075		)	(1,817		)	(2,064		)
	Foreign	(727		)	69			492
	State	(252		)	475			(1,334		)
	Subtotal	(3,054		)	(1,273		)	(2,906		)
	Total tax provision	$	12,154		$	18,663		$	8,184
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):
		2013			2012			2011
	Income taxes at U.S. federal statutory tax rate	$	20,651		$	24,803		$	11,539
	Increase (decrease) in taxes resulting from:
	Change in the balance of the valuation allowance for deferred tax assets allocated to income tax expense	1,447			3,714			477
	State income taxes, net of federal income tax benefit	179			956			(547		)
	Transaction costs	—			509			574
	Meals and entertainment	1,034			962			570
	Changes in taxes previously accrued	(3,098		)	(2,422		)	263
	Foreign tax rate differences	(4,892		)	(4,236		)	(3,412		)
	Recognition of uncertain tax positions	(89		)	(800		)	(214		)
	Contingent consideration reversal	(1,461		)	(2,869		)	—
	Domestic Production Activities Deduction	(1,548		)	(1,440		)	(52		)
	Other matters	(69		)	(514		)	(1,014		)
	Total tax provision	$	12,154		$	18,663		$	8,184
	Effective tax rate	20.6		%	26.3		%	24.8		%
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):
		2013			2012
	Current deferred income tax assets, net	$	4,640		$	3,975
	Current deferred income tax liabilities, net	(4,304		)	(5,994		)
	Noncurrent deferred income tax assets, net	6,957			7,989
	Noncurrent deferred income tax liabilities, net	(38,217		)	(39,790		)
	Net deferred income tax liabilities	$	(30,924	)	$	(33,820	)
	Net deferred taxes consisted of the following at December 31 (in thousands):
		2013			2012
	Deferred income tax assets:
	Foreign tax credit carryforwards	$	535		$	88
	Net operating loss carryforwards	17,146			17,225
	Accrued expenses	13,517			10,443
	Other	8,158			8,394
	Total gross deferred income tax assets	39,356			36,150
	Less valuation allowance	(7,797		)	(6,574		)
	Net deferred income tax assets	31,559			29,576
	Deferred income tax liabilities:
	Property, plant and equipment	(12,901		)	(14,051		)
	Intangible assets	(34,983		)	(33,715		)
	Undistributed foreign earnings	(7,051		)	(7,051		)
	Other	(7,548		)	(8,579		)
	Total deferred income tax liabilities	(62,483		)	(63,396		)
	Net deferred income tax liabilities	$	(30,924	)	$	(33,820	)
Summary of Valuation Allowance [Table Text Block]	'
	Activity in the valuation allowance is summarized as follows for the years ended December 31 (in thousands):
		2013			2012			2011
	Balance, at beginning of year	$	6,574		$	4,691		$	5,083
	Additions	1,754			2,062			1,058
	Reversals	(131		)	(191		)	(1,352		)
	Other adjustments	(400		)	12			(98		)
	Balance, at end of year	$	7,797		$	6,574		$	4,691
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):
		2013			2012			2011
	Balance at January 1,	$	3,170		$	1,050		$	1,672
	Additions for tax positions of prior years related to acquisitions	—			3,145			—
	Additions for tax positions of prior years	30			111			41
	Reductions for tax positions of prior years	—			—			(238		)
	Lapse in statute of limitations	(236		)	(1,162		)	(406		)
	Foreign currency translation	(28		)	26			(19		)
	Balance at December 31, total tax provision	$	2,936		$	3,170		$	1,050

Note_9_Commitments_and_Conting1

Note 9 - Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Lease Payments Table [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	'
	At December 31, 2013, the future minimum lease payments required under the non-cancellable operating leases were as follows (in thousands):
	Year	Minimum Lease Payments
	2014	$	17,559
	2015	13,509
	2016	8,940
	2017	5,457
	2018	3,082
	Thereafter	2,721
	Total	$	51,268

Note_10_Derivative_Financial_I1

Note 10 - Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
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-13				31-Dec-12
	Derivatives Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	24			$	—
			Total Assets		$	24			$	—
	Forward Currency Contracts		Accrued expenses		$	—			$	9
	Interest Rate Swaps		Other non-current liabilities		1,220				764
			Total Liabilities		$	1,220			$	773
	Derivatives Not Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	752			$	—
			Total Assets		$	752			$	—
	Forward Currency Contracts		Accrued Expenses		$	—			$	585
			Total Derivative Assets		$	776			$	—
			Total Derivative Liabilities		1,220				1,358
			Total Net Derivative Liability		$	444			$	1,358
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-13				(Level 1)				(Level 2)		(Level 3)
	Assets:
	Forward Currency Contracts	$	776			$	—			$	776	$	—
	Total	$	776			$	—			$	776	$	—
	Liabilities:
	Interest Rate Swap	$	1,220			$	—			$	1,220	$	—
	Total	$	1,220			$	—			$	1,220	$	—
		Total Fair Value at				Quoted Prices in Active Markets for Identical Assets				Significant Observable Inputs		Significant Unobservable Inputs
		31-Dec-12				(Level 1)				(Level 2)		(Level 3)
	Liabilities:
	Forward Currency Contracts	$	594			$	—			$	594	$	—
	Interest Rate Swap	764				—				764		—
	Total	$	1,358			$	—			$	1,358	$	—
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	'
	The following table summarizes the Company’s derivative positions at December 31, 2013:
		Position		Notional				Weighted		Average
				Amount				Average		Exchange
								Remaining		Rate
								Maturity
								In Years
	Canadian Dollar/USD	Sell		$	10,208,460			0.2		1.06
	Singapore Dollar/USD	Sell		$	1,973,834			1		1.26
	Hong Kong Dollar/USD	Sell		$	1,558,146			1		7.75
	Australian Dollar/USD	Sell		$	3,030,088			1		0.87
	USD/British Pound	Sell		£	1,900,000			0.7		1.6533
	EURO/British Pound	Sell		£	8,000,000			0.5		0.8317
	Interest Rate Swap			$	170,625,000			2.6

Note_11_Discontinued_Operation1

Note 11 - Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2013
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):
		2013			2012			2011
	Revenues	$	9,763		$	11,132		$	12,819
	Gross profit (loss)	(4,255		)	(645		)	445
	Operating expenses	1,973			2,038			1,615
	Closure charges of welding business	5,019			—			—
	Operating loss	(11,247		)	2,683			(1,170		)
	Loss before tax benefits	(10,731		)	(2,904		)	(1,206		)
	Tax benefits	4,270			1,191			619
	Net loss	(6,461		)	(1,713		)	(587		)
	Balance sheet data for discontinued operations was as follows at December 31 (in thousands):
		2013			2012
	Restricted cash	$	1,193		$	1,192
	Receivables, net	4,038			4,380
	Costs and estimated earnings in excess of billings	4			2,775
	Inventories	—			386
	Prepaid expenses and other current assets	200			253
	Property, plant and equipment, less accumulated depreciation	1,118			2,803
	Other assets	1,803			4,021
	Total assets	$	8,356		$	15,810
	Accounts payable	$	2,050		$	3,225
	Accrued expenses	20			1,660
	Deferred tax liability	197			—
	Total liabilities	$	2,267		$	4,885

Note_12_Segment_and_Geographic1

Note 12 - Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Schedule of Segment Reporting Information, by Segment [Table Text Block]	'
	Financial information by segment was as follows (in thousands):
		2013			2012			2011
	Revenues:
	Energy and Mining	$	562,119		$	513,975		$	420,411
	North American Water and Wastewater	359,536			317,338			357,507
	International Water and Wastewater	109,602			111,035			130,734
	Commercial and Structural	60,163			74,483			17,114
	Total revenues	$	1,091,420		$	1,016,831		$	925,766
	Operating income (loss):
	Energy and Mining	$	38,395		$	59,994		$	36,181
	North American Water and Wastewater	33,029			22,057			6,749
	International Water and Wastewater	208			(9,384		)	3,488
	Commercial and Structural	(4,750		)	9,136			(711		)
	Total operating income	$	66,882		$	81,803		$	45,707
	Total assets:
	Energy and Mining	$	723,468		$	569,109		$	465,792
	North American Water and Wastewater	263,173			268,097			281,353
	International Water and Wastewater	112,546			120,466			139,723
	Commercial and Structural	139,058			142,561			128,358
	Corporate	116,317			101,851			96,336
	Discontinued Operations	8,356			15,810			13,402
	Total assets	$	1,362,918		$	1,217,894		$	1,124,964
	Capital expenditures:
	Energy and Mining	$	15,367		$	34,796		$	11,092
	North American Water and Wastewater	4,858			3,023			3,378
	International Water and Wastewater	3,500			4,382			3,706
	Commercial and Structural	470			443			43
	Corporate	1,890			2,094			3,052
	Total capital expenditures	$	26,085		$	44,738		$	21,271
	Depreciation and amortization:
	Energy and Mining	$	21,954		$	18,175		$	16,106
	North American Water and Wastewater	8,398			8,886			9,405
	International Water and Wastewater	4,304			4,405			4,735
	Commercial and Structural	3,850			4,509			1,183
	Corporate	1,823			1,683			4,103
	Total depreciation and amortization	$	40,329		$	37,658		$	35,532
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):
		2013			2012			2011
	Revenues:
	United States	$	672,192		$	589,027		$	539,378
	Canada	179,236			180,283			178,739
	Europe	90,646			86,883			102,471
	Other foreign	149,346			160,638			105,178
	Total revenues	$	1,091,420		$	1,016,831		$	925,766
	Operating income (loss):
	United States	$	24,977		$	40,676		$	(1,042	)
	Canada	28,955			31,376			31,892
	Europe	6,276			6,196			9,391
	Other foreign	6,674			3,555			5,466
	Total operating income	$	66,882		$	81,803		$	45,707
	Long-lived assets: (1)
	United States	$	154,367		$	151,337		$	144,151
	Canada	28,539			28,724			22,998
	Europe	10,007			16,396			12,474
	Other foreign	12,806			14,040			12,693
	Total long-lived assets	$	205,719		$	210,497		$	192,316
	__________________________
	(1) Long-lived assets as of December 31, 2013, 2012 and 2011 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, 2013
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, 2013 and 2012 (in thousands, except per share data):
		First			Second			Third			Fourth
		Quarter			Quarter			Quarter(1)			Quarter(1)
	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	$	0.1		$	0.47		$	0.37		$	0.38
	Loss from discontinued operations	(0.03		)	(0.13		)	(0.01		)	0
	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	(0.03		)	(0.13		)	(0.01		)	0
	Net income	$	0.06		$	0.34		$	0.36		$	0.37
	____________________
	(1)    Includes the financial results of Brinderson, which was acquired in July 2013.
		First			Second			Third			Fourth
		Quarter			Quarter(2)			Quarter(2)			Quarter(2)
	Year ended December 31, 2012:
	Revenues	$	227,879		$	254,490		$	262,867		$	271,595
	Gross profit	52,572			62,219			62,931			66,032
	Operating income	11,187			18,654			26,865			25,097
	Income from continuing operations	7,342			12,191			21,170			17,859
	Loss from discontinued operations	(192		)	(253		)	(435		)	(833		)
	Net income	7,150			11,938			20,735			17,026
	Basic earnings per share:
	Income from continuing operations	$	0.17		$	0.3		$	0.51		$	0.4
	Loss from discontinued operations	0			(0.01		)	(0.01		)	(0.02		)
	Net income	$	0.17		$	0.29		$	0.5		$	0.38
	Diluted earnings per share
	Income from continuing operations	$	0.17		$	0.3		$	0.5		$	0.4
	Loss from discontinued operations	0			(0.01		)	(0.01		)	(0.02		)
	Net income	$	0.17		$	0.29		$	0.49		$	0.38
	____________________
	(2)    Includes the financial results of Fyfe Asia, which was acquired in April 2012.

Note_1_Description_of_Business2

Note 1 - Description of Business (Details)

3 Months Ended

12 Months Ended

24 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

Sep. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2012

Mar. 31, 2012

Sep. 30, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jun. 30, 2015

Jun. 30, 2015

Jul. 02, 2013

Apr. 30, 2012

Jun. 30, 2013

Jun. 30, 2013

Dec. 31, 2013

Jul. 02, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2011

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2012

Dec. 31, 2013

Jul. 02, 2013

USD ($)

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

GBP (£)

USD ($)

jointVenture

Goodwill and Intagible Assets [Member]

Tangible Assets [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Fyfe Asia [Member]

Fyfe LA [Member]

CRTS [Member]

CRTS [Member]

CRTS [Member]

USTS [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Delta Double Jointing [Member]

2013 Credit Facility [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

General [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

$147,600,000

'

'

'

'

$147,600,000

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

650,000,000

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

'

1,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tangible Asset Impairment Charges, Net of Tax

'

700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Exit Costs

'

'

'

'

'

'

100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15,000,000

'

'

'

'

'

Business Combination, Contingent Consideration, Amounts Paid

'

'

'

'

'

'

2,112,000

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Earnout reversal

'

'

'

'

'

'

-4,175,000

-10,019,000

-1,700,000

'

'

'

'

'

'

'

'

'

'

3,900,000

8,200,000

'

'

'

'

'

'

Business Combination, Contingent Consideration, Liability

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

700,000

'

'

'

'

'

'

'

Noncontrolling Interest, Ownership Percentage by Parent

'

50.00%

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

51.00%

'

'

59.00%

'

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

49.00%

'

'

41.00%

'

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

'

'

'

'

'

'

'

'

'

'

'

'

147,605,000

'

40,144,000

'

'

'

'

'

'

'

'

'

Gain (Loss) on Disposition of Business

'

11,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Transaction Costs

'

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

115,800,000

'

40,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from line of credit

'

'

'

18,000,000

'

'

0

26,000,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments for Previous Acquisition

'

'

'

'

$1,100,000

'

'

$600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note_1_Description_of_Business3

Note 1 - Description of Business (Details) - Business Acquisitions - Contributions to Revenues and Profits Since Acquisitions (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Brinderson LP [Member]	'		'
Note 1 - General - Business Acquisitions - Contributions to Revenues and Profits Since Acquisitions [Line Items]	'		'
Revenues	$108,233		$0
Net income	4,838	[1]	0	[1]
Fyfe LA And Fyfe Asia [Member]	'		'
Note 1 - General - Business Acquisitions - Contributions to Revenues and Profits Since Acquisitions [Line Items]	'		'
Revenues	16,986		12,894
Net income	$1,091	[1]	$781	[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		Dec. 31, 2012
Business Acquisitions - Proforma Information [Abstract]	'		'		'
Revenues	'	[1]	$1,201,521		$1,239,825
Net income	'	[1]	$49,410	[1]	$65,995	[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	3 Months Ended				12 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Jul. 02, 2013	Dec. 31, 2013	Dec. 31, 2012
	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	'	$1,303	'
Receivables and cost and estimated earnings in excess of billings	'	'	'	'	28,353	'	9,022	'
Prepaid expenses and other current assets	'	'	'	'	655	'	1,262	'
Property, plant and equipment	'	'	'	'	6,848	'	938	'
Identified intangible assets	'	'	'	'	60,210	'	14,130	'
Other assets	'	'	'	'	1,071	'	0	'
Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	'	'	'	'	-16,122	'	-4,109	'
Deferred tax liabilities	'	'	'	'	0	'	-2,410	'
Total consideration recorded	18,300	14,000	'	'	147,605	'	40,144	'
Total identifiable net assets	'	'	'	'	84,857	84,907	20,136	20,342
Goodwill at September 30, 2013	'	'	$334,180	$272,294	$62,748	$62,698	$20,008	$19,802

Note_1_Description_of_Business6

Note 1 - Description of Business (Details) - Business Acquisitions - Continued Purchase Price Allocation (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Jul. 02, 2013	Dec. 31, 2013	Dec. 31, 2013
In Thousands, unless otherwise specified			Fyfe Asia [Member]	Brinderson LP [Member]	Brinderson LP [Member]	Payables [Member]	Payables [Member]
						Fyfe Asia [Member]	Brinderson LP [Member]
Identifiable Net Assets [Roll Forward]	'	'	'	'	'	'	'
Total identifiable net assets	'	'	$20,342	'	$84,907	'	'
Change in goodwill related to acquisitions	'	'	206	50	'	206	50
Total identifiable net assets	'	'	20,136	84,857	84,907	'	'
FYFE Asia Adjustment - Goodwill	'	'	'	'	'	'	'
Goodwill	334,180	272,294	19,802	'	62,698	'	'
Change in goodwill related to acquisitions	'	'	206	50	'	206	50
Goodwill	$334,180	$272,294	$20,008	$62,748	$62,698	'	'

Note_2_Accounting_Policies_Det

Note 2 - Accounting Policies (Details)

3 Months Ended

12 Months Ended

24 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Jun. 30, 2013

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jun. 30, 2015

Jun. 30, 2015

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Oct. 02, 2013

Dec. 31, 2013

Oct. 02, 2013

Oct. 02, 2013

Dec. 31, 2013

Dec. 31, 2013

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

USD ($)

GBP (£)

Minimum [Member]

Maximum [Member]

Insituform-Germany [Member]

WCU [Member]

Bayou Coating [Member]

Bayou [Member]

Bayou [Member]

Fyfe NA [Member]

Fyfe NA [Member]

Bayou and Fyfe NA [Member]

Delta Double Jointing [Member]

Goodwill [Member]

segment

USD ($)

USD ($)

reportingUnit

Note 2 - Accounting Policies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Reportable Segments

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9

Retainage, Percent of Contract Value Withheld

'

'

'

'

'

'

'

5.00%

15.00%

'

'

'

'

'

'

'

'

'

'

Research and Development Expense

'

'

$2,600,000

$1,800,000

$2,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value Inputs, Discount Rate

'

'

'

'

'

'

'

13.00%

16.50%

'

'

'

13.50%

'

16.00%

'

'

'

'

Compound Annual Growth Rate Assumption

'

'

'

'

'

'

'

2.00%

17.00%

'

'

'

10.00%

'

17.00%

'

'

'

'

Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax

'

'

600,000

14,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax

'

'

1,200,000

800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax

'

'

200,000

200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling Interest, Ownership Percentage by Parent

50.00%

50.00%

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

59.00%

'

Business Combination, Consideration Transferred

18,300,000

14,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain (Loss) on Disposition of Business

11,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Transaction Costs

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%

'

Equity Method Investment, Ownership Percentage

'

'

'

'

'

'

'

'

'

'

'

49.00%

'

'

'

'

'

'

'

Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures

'

'

9,101,000

19,181,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value Inputs, Long-term Revenue Growth Rate

'

'

'

'

'

'

'

1.00%

3.50%

'

'

'

3.00%

'

3.50%

'

'

'

'

Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

2.80%

'

5.40%

'

'

'

Reporting Unit, Change in Fair Value, Value

'

'

'

'

'

'

'

'

'

'

'

'

32,300,000

'

'

'

'

'

'

Reporting Unit, Change in Fair Value, Percent

'

'

'

'

'

'

'

'

'

'

'

'

17.20%

'

2.70%

'

'

'

'

Goodwill

'

'

$334,180,000

$272,294,000

'

'

'

'

'

'

'

'

'

'

'

'

$72,900,000

'

'

Contract Receivable Retainage, Due after Next Twelve Months

'

'

12.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note_2_Accounting_Policies_Det1

Note 2 - Accounting Policies (Details) - Financial Data for Earnings Per Share	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]	'	'	'
Weighted average number of common shares used for basic EPS	38,692,658	39,222,737	39,362,138
Effect of dilutive stock options and restricted and deferred stock unit awards	389,684	313,654	336,317
Weighted average number of common shares and dilutive potential common stock used in dilutive EPS	39,082,342	39,536,391	39,698,455
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	318,026	223,536	189,202

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, 2013		Dec. 31, 2012	Dec. 31, 2011
Financial Data for Investments in Affiliated Companies [Abstract]	'		'	'
Current assets	$10,220		$32,752	'
Non-current assets	10,022		22,495	'
Current liabilities	1,743		16,006	'
Non-current liabilities	0		484	'
income statement data	'		'	'
Revenue	89,157	[1]	141,233	134,716
Gross profit	27,336	[1]	40,342	29,651
Net income	17,946	[1]	22,009	12,512
Equity in earnings of affiliated companies	$5,159	[1]	$6,359	$3,471
[1]	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, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financial Data for Variable Interest Entities - Balance Sheet [Abstract]	'	'
Current assets	$55,651	$65,251
Non-current assets	47,606	47,086
Current liabilities	33,886	45,604
Non-current liabilities	$25,020	$23,169

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, 2013	Dec. 31, 2012	Dec. 31, 2011
Financial Data for Variable Interest Entities - Income Statement [Abstract]	'	'	'
Revenue	$85,908	$107,821	$55,792
Gross profit	12,998	19,625	12,005
Net income	$1,892	$3,622	$1,959

Note_3_Supplemental_Balance_Sh2

Note 3 - Supplemental Balance Sheet Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 3 - Supplemental Balance Sheet Information [Abstract]	'	'	'
Depreciation	$28	$27.10	$28.60

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, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]	'	'	'
Balance, at beginning of year	$2,953	$3,077	$2,536
Charged to expense	1,043	428	397
Write-offs and adjustments	-555	-552	144
Balance, at beginning of year	$3,441	$2,953	$3,077

Note_3_Supplemental_Balance_Sh4

Note 3 - Supplemental Balance Sheet Information Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Costs and Estimated Earnings on Uncompleted Contracts [Abstract]	'	'
Costs incurred on uncompleted contracts	$740,403	$664,662
Estimated earnings to date	141,413	183,850
Subtotal	881,816	848,512
Less – billings to date	-826,795	-812,324
Costs and estimated earnings in excess of billings	79,999	67,740
Billings in excess of costs and estimated earnings	-24,978	-31,552
Total	$55,021	$36,188

Note_3_Supplemental_Balance_Sh5

Note 3 - Supplemental Balance Sheet Information Schedule of Inventories (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Inventories [Abstract]	'	'
Raw materials and supplies	$19,680	$16,250
Work-in-process	8,217	8,876
Finished products	12,518	18,056
Construction materials	18,353	15,941
Total	$58,768	$59,123

Note_3_Supplemental_Balance_Sh6

Note 3 - Supplemental Balance Sheet Information Schedule of Property Plant and Equipment (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

In Thousands, unless otherwise specified

Land and Land Improvements [Member]

Land and Land Improvements [Member]

Building and Building Improvements [Member]

Building and Building Improvements [Member]

Building and Building Improvements [Member]

Building and Building Improvements [Member]

Machinery and Equipment [Member]

Machinery and Equipment [Member]

Machinery and Equipment [Member]

Machinery and Equipment [Member]

Furniture and Fixtures [Member]

Furniture and Fixtures [Member]

Furniture and Fixtures [Member]

Furniture and Fixtures [Member]

Autos and Trucks [Member]

Autos and Trucks [Member]

Autos and Trucks [Member]

Autos and Trucks [Member]

Construction in Progress [Member]

Construction in Progress [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Property, Plant and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, Plant and Equipment, Gross

$370,146

$355,983

$11,964

$11,437

$63,870

$64,604

'

'

$185,307

$177,383

'

'

$25,848

$16,933

'

'

$52,145

$50,119

'

'

$31,012

$35,507

Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment

-187,843

-172,820

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, Plant and Equipment, Net

$182,303

$183,163

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, Plant and Equipment, Esimated Useful Life

'

'

'

'

'

'

'5 years

'40 years

'

'

'4 years

'10 years

'

'

'3 years

'10 years

'

'

'3 years

'10 years

'

'

Note_3_Supplemental_Balance_Sh7

Note 3 - Supplemental Balance Sheet Information Schedule of Accrued Expenses (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Accrued Expenses [Abstract]	'	'
Vendor and other accrued expenses	$36,778	$32,394
Estimated casualty and healthcare liabilities	13,775	12,899
Job costs	13,843	14,077
Accured compensation	15,942	12,943
Income tax payable and deferred income taxes	10,628	7,267
Total	$90,966	$79,580

Note_4_Goodwill_and_Intangible2

Note 4 - Goodwill and Intangible Assets (Details) (USD $)

3 Months Ended

12 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Jul. 31, 2013

Sep. 30, 2013

Sep. 30, 2013

Customer relationships [Member]

Non-competes [Member]

Fyfe Asia [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Customer relationships [Member]

Non-competes [Member]

Finite-Lived Intangible Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Goodwill, Written off Related to Sale of Business Unit

$1.40

'

'

'

'

'

'

'

'

'

'

Goodwill, Acquired During Period

'

62.9

'

'

'

'

0.2

62.7

'

'

'

Impairment of Intangible Assets (Excluding Goodwill)

2.5

'

'

'

'

'

'

'

'

'

'

Finite-Lived Customer Relationships, Gross

'

'

'

'

'

'

'

'

59.8

'

'

Finite-Lived Intangible Asset, Useful Life

'

'

'

'

'14 years

[1],[2]

'5 years

[1],[2]

'

'

'

'15 years

'5 years

Finite-Lived Noncompete Agreements, Gross

'

'

'

'

'

'

'

'

0.4

'

'

Amortization of Intangible Assets

'

$12.20

$10.50

$6.90

'

'

'

'

'

'

'

[1]

During the third quarter of 2013, the Company recorded $59.8 million in customer relationships to be amortized over a weighted average life of 15 years and $0.4 million in non-compete agreements to be amortized over a weighted average life of 5 years related to the acquisition of Brinderson, as discussion in Note 1.

[2]

During the second quarter of 2013, the Company approved a plan of liquidation with respect to BWW and, in connection therewith, recorded a write-down of the $2.5 million of intangible assets associated with BWW, which operation now is reported as discontinued. Consequently, the intangible assets and accumulated amortization associated with BWW are no longer included in this table. Additionally, all prior year balances have been retrospectively adjusted. For further information, see Note 11.

Note_4_Goodwill_and_Intangible3

Note 4 - Goodwill and Intangible Assets (Details) - Reconciliation Goodwill (USD $)	12 Months Ended
	Dec. 31, 2013
Goodwill [Roll Forward]	'
Goodwill	$272,294,000
Additions to goodwill through acquisitions	62,900,000
Foreign currency translation	-1,000,000
Goodwill	334,180,000
Energy And Mining [Member]	'
Goodwill [Roll Forward]	'
Goodwill	76,700,000	[1],[2]
Additions to goodwill through acquisitions	62,700,000	[1],[2]
Foreign currency translation	-800,000	[1],[2]
Goodwill	138,600,000	[1],[2]
North American Water And Wastewater [Member]	'
Goodwill [Roll Forward]	'
Goodwill	101,900,000
Additions to goodwill through acquisitions	0
Foreign currency translation	-300,000
Goodwill	101,600,000
International Water And Wastewater [Member]	'
Goodwill [Roll Forward]	'
Goodwill	28,100,000
Additions to goodwill through acquisitions	0
Foreign currency translation	400,000
Goodwill	28,500,000
Commercial And Structural [Member]	'
Goodwill [Roll Forward]	'
Goodwill	65,600,000	[3]
Additions to goodwill through acquisitions	200,000	[3]
Foreign currency translation	-300,000	[3]
Goodwill	$65,500,000	[3]
[1]	During the second quarter of 2013, the Company approved a plan of liquidation with respect to BWW and, in connection therewith, recorded a write-down of the $1.4 million of goodwill associated with BWW, which operation now is reported as discontinued. Consequently, the goodwill associated with BWW is no longer included in this table. Additionally, all prior year balances have been retrospectively adjusted. For further information, see Note 11.
[2]	During 2013, the Company recorded an increase of goodwill of $62.7 million related to the Brinderson acquisition.
[3]	During 2013, the Company recorded an increase of goodwill of $0.2 million related to the Fyfe Asia acquisition.

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, 2013		Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]	'		'
Gross Carrying Amount	$273,385	[1],[2]	$211,721
Accumulated Amortization	-64,102	[1],[2]	-52,091
Net Carrying Amount	209,283		159,629
Licensing Agreements [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Weighted Average Useful Lives	'6 years	[1],[2]	'
Gross Carrying Amount	3,917	[1],[2]	3,925
Accumulated Amortization	-2,977	[1],[2]	-2,821
Net Carrying Amount	940	[1],[2]	1,104
Backlog [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Weighted Average Useful Lives	'0 years	[1],[2]	'
Gross Carrying Amount	4,745	[1],[2]	4,756
Accumulated Amortization	-4,745	[1],[2]	-4,756
Net Carrying Amount	0	[1],[2]	0
Leases [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Weighted Average Useful Lives	'13 years	[1],[2]	'
Gross Carrying Amount	2,067	[1],[2]	2,067
Accumulated Amortization	-477	[1],[2]	-331
Net Carrying Amount	1,590	[1],[2]	1,736
Trademarks [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Weighted Average Useful Lives	'16 years	[1],[2]	'
Gross Carrying Amount	21,394	[1],[2]	21,290
Accumulated Amortization	-4,167	[1],[2]	-3,317
Net Carrying Amount	17,227	[1],[2]	17,972
Non-competes [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Weighted Average Useful Lives	'5 years	[1],[2]	'
Gross Carrying Amount	1,140	[1],[2]	710
Accumulated Amortization	-753	[1],[2]	-710
Net Carrying Amount	387	[1],[2]	0
Customer relationships [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Weighted Average Useful Lives	'14 years	[1],[2]	'
Gross Carrying Amount	182,703	[1],[2]	123,301
Accumulated Amortization	-28,287	[1],[2]	-18,912
Net Carrying Amount	154,416	[1],[2]	104,389
Patents and acquired technology [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Weighted Average Useful Lives	'17 years	[1],[2]	'
Gross Carrying Amount	57,419	[1],[2]	55,672
Accumulated Amortization	-22,696	[1],[2]	-21,244
Net Carrying Amount	$34,723	[1],[2]	$34,428
[1]	During the third quarter of 2013, the Company recorded $59.8 million in customer relationships to be amortized over a weighted average life of 15 years and $0.4 million in non-compete agreements to be amortized over a weighted average life of 5 years related to the acquisition of Brinderson, as discussion in Note 1.
[2]	During the second quarter of 2013, the Company approved a plan of liquidation with respect to BWW and, in connection therewith, recorded a write-down of the $2.5 million of intangible assets associated with BWW, which operation now is reported as discontinued. Consequently, the intangible assets and accumulated amortization associated with BWW are no longer included in this table. Additionally, all prior year balances have been retrospectively adjusted. For further information, see Note 11.

Note_4_Goodwill_and_Intangible5

Note 4 - Goodwill and Intangible Assets (Details) - Estimated Future Amortization Expense by Year (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Estimated Future Amortization Expense by Year [Abstract]	'
2013	$14,606
2014	14,606
2015	14,602
2016	14,565
2017	$14,488

Note_5_LongTerm_Debt_and_Credi2

Note 5 - Long-Term Debt and Credit Facility (Details) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Jul. 31, 2013

Jul. 02, 2013

Dec. 31, 2012

Dec. 31, 2013

Jul. 31, 2013

Jul. 02, 2013

Dec. 31, 2012

Aug. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Jul. 31, 2013

2013 Credit Facility [Member]

2013 Credit Facility [Member]

2013 Credit Facility [Member]

2011 Credit Facility [Member]

2011 Credit Facility [Member]

Minimum [Member]

Maximum [Member]

Bayou Wasco [Member]

Wasco Energy [Member]

Wasco Energy [Member]

Initial [Member]

Initial [Member]

Additional [Member]

Additional [Member]

BPPC [Member]

BPPC [Member]

Bayou Wasco [Member]

Insurance Carriers Collateral [Member]

Work Performance Obligations [Member]

2013 Interest Rate Swap [Member]

2013 Credit Facility [Member]

2013 Credit Facility [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

$650,000,000

$250,000,000

$500,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

300,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LineOfCreditFacilityTerm

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured Debt

'

'

'

'

341,250,000

'

350,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Fixed Interest Rate

0.87%

0.87%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

TermLoanTerm

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Maturity Date

1-Jul-18

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Amount Outstanding

'

'

35,500,000

'

35,500,000

'

'

26,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

147,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility, Retired Amount

'

'

232,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Consideration Paid

'

'

7,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

1.25%

2.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Description of Variable Rate Basis

'

'

'

'

'one month LIBOR borrowing rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate at Period End

'

'

'

'

2.68%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Due from Joint Ventures

'

'

'

4,100,000

'

'

'

'

'

'

'

14,000,000

6,900,000

5,500,000

8,000,000

8,000,000

6,200,000

6,200,000

14,200,000

14,200,000

11,000,000

'

'

'

Other Long-term Debt

4,900,000

'

'

5,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other Loans Payable

100,000

'

'

100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of Credit Outstanding, Amount

18,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,200,000

8,000,000

'

Unsecured Debt

'

'

'

218,750,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Fair Value

380,100,000

'

'

253,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Asset, Notional Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

175,000,000

Derivative, Variable Interest Rate

2.17%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Amount of Hedged Item

'

'

'

'

'

175,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility Maximum Consolidated Leverage Ratio

3.75

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CreditFacilityMinimumConsolidatedLeverageRatio

3.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility Actual Consolidated Leverage Ratio

2.73

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Remaining Borrowing Capacity

$145,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility Minimum Consolidated Fixed Charge Ratio

1.25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility Actual Consolidated Fixed Charge Ratio

1.66

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note_5_LongTerm_Debt_and_Credi3

Note 5 - Long-Term Debt and Credit Facility (Details) - Debt Instruments Table (USD $)	Dec. 31, 2013	Jul. 02, 2013	Dec. 31, 2012
Long-term debt, term note and notes payable:	'	'	'
Original term note, due August 31, 2016	'	'	$218,750,000
Line of credit, 2.17% in 2013 and 2.49% in 2012	'	35,500,000	'
Other notes with interest rates from 3.3% to 6.5%	11,890,000	'	10,873,000
Subtotal	388,640,000	'	255,623,000
Less – Current maturities and notes payable	22,024,000	'	33,775,000
Total	366,616,000	'	221,848,000
Principal payments in next five years:	'	'	'
2014	22,024,000	'	'
2015	31,131,000	'	'
2016	30,625,000	'	'
2017	40,500,000	'	'
2018	264,360,000	'	'
Total	366,616,000	'	221,848,000
2013 Credit Facility [Member]	'	'	'
Long-term debt, term note and notes payable:	'	'	'
Term note, current annualized rate 2.21% due July 1, 2018	341,250,000	350,000,000	'
Line of credit, 2.17% in 2013 and 2.49% in 2012	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	'	'	$26,000,000

Note_6_Stockholders_Equity_Det

Note 6 - Stockholders' Equity (Details) (USD $)

1 Months Ended

1 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 30, 2013

31-May-13

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2010

Feb. 28, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2008

Jun. 30, 2008

Jun. 30, 2008

program

Subsequent Event [Member]

Through the Open Market Repurchase Program [Member]

In Connection with Equity Compensation Programs [Member]

Stock Awards [Member]

Stock Awards [Member]

Stock Awards [Member]

Stock Awards [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

2013 Employee Plan [Member]

2013 Employee Plan [Member]

2009 Employee Plan [Member]

2009 Employee Plan [Member]

2006 Employee Plan [Member]

2006 Employee Plan [Member]

2011 Director Plan [Member]

2011 Director Plan [Member]

2006 Director Plan [Member]

2001 Director Plan [Member]

Inducement Grants [Member]

Inducement Grants [Member]

Inducement Grants [Member]

Inducement Grants [Member]

Stock Awards [Member]

Stock Awards [Member]

Stock Awards [Member]

Deferred Stock Units [Member]

Deferred Stock Units [Member]

Deferred Stock Units [Member]

Chief Executive Officer [Member]

Performance Shares [Member]

Restricted Stock [Member]

Chief Executive Officer [Member]

Chief Executive Officer [Member]

Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Repurchase Program, Authorized Amount

$10

$10

$5

'

'

'

$20

'

$10

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Repurchased During Period, Shares (in Shares)

'

'

'

'

'

'

'

1,102,454

115,931

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Repurchased During Period, Value

'

'

'

'

'

'

'

$25

$2.60

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)

'

'

'

'

'

'

'

$22.68

$22.84

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Equity-Based Compensation Plans

'

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,895,000

'

'

'

'

'

200,000

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number

'

'

'

'

'

'

'

'

'

555,025

698,869

643,117

888,855

'

'

'

'

36,528

'

515,844

'

2,653

'

87,337

59,818

67,300

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

118,397

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period

'

'

'

'

'

'

'

'

'

'

'

'

'

435,025

239,523

168,018

'

'

'

'

'

'

'

'

'

'

'

'

52,784

103,092

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number

'

'

1,216,809

1,208,824

1,107,712

1,198,516

'

'

'

'

'

'

'

'

'

'

'

'

653,065

'

437,362

'

'

'

'

'

118,397

'

'

'

Note_7_Equitybased_Compensatio2

Note 7 - Equity-based Compensation (Details) - Summary of Stock Award Activity (USD $)

12 Months Ended

12 Months Ended

In Millions, except Share data, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Stock Awards [Member]

Stock Awards [Member]

Stock Awards [Member]

Stock Awards [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Stock award activity [Rollforward]

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Awards - Outstanding

'

'

'

555,025

698,869

643,117

888,855

'

'

'

'

'

'

Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)

'

'

'

$22.79

$19.39

$17.48

$15.25

'

'

'

'

'

'

Stock Awards - Awarded

'

'

'

'

'

'

'

435,025

239,523

168,018

112,401

222,379

6,768

Weighted Average Award Date Fair Value - Awarded (in Dollars per share)

'

'

'

'

'

'

'

$24.09

$18.07

$26.41

$25.11

$18.11

$26.60

Stock Awards - Distributed

'

'

'

'

'

'

'

-274,784

-289,001

-270,142

-13,761

-15,177

-9,934

Weighted Average Award Date Fair Value - Distributed (in Dollars per share)

'

'

'

'

'

'

'

$19.04

$13.42

$13.38

$18.87

$14.32

$11.19

Stock Awards - Forfeited

'

'

'

'

'

'

'

-236,388

-36,325

-140,448

-166,337

-65,647

0

Weighted Average Award Date Fair Value - Forfeited (in Dollars per share)

'

'

'

'

'

'

'

$23.10

$20.13

$22.97

$19.55

$18.18

$0

Stock Awards - Outstanding

'

'

'

555,025

698,869

643,117

888,855

'

'

'

'

'

'

Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)

'

'

'

$22.79

$19.39

$17.48

$15.25

'

'

'

'

'

'

Expense associated with stock awards

$3

$4

$3.70

'

'

'

'

'

'

'

'

'

'

Unrecognized pre-tax expense

$7.50

'

'

'

'

'

'

'

'

'

'

'

'

Remaining period for recognition

'1 year 10 months 24 days

'

'

'

'

'

'

'

'

'

'

'

'

Note_7_Equitybased_Compensatio3

Note 7 - Equity-based Compensation (Details) - Summary of Deferred Stock Unit Activity (USD $)	3 Months Ended		12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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	'	1	'	'
Expense recorded	'	'	$3	$4	$3.70
Deferred Stock Units [Member]	'	'	'	'	'
Note 6 - Stockholders' Equity and Equity Compensation (Details) - Summary of Deferred Stock Unit Activity [Line Items]	'	'	'	'	'
Stock Awards - Outstanding	'	'	181,518	173,916	163,318
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	'	'	$19.06	$20.12	$19.43
Stock Awards - Awarded	'	'	39,966	41,734	31,238
Awarded (in Dollars per share)	'	'	$22.33	$17.78	$23.75
Shares distributed	'	'	-7,029	-34,132	-20,640
Shares distributed (in Dollars per share)	'	'	$22.67	$22.90	$20.13
Stock Awards - Outstanding	214,455	181,518	214,455	181,518	173,916
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	$19.56	$19.06	$19.56	$19.06	$20.12
Expense recorded	$0	$0	$0.90	$0.70	$0.70

Note_7_Equitybased_Compensatio4

Note 7 - Equity-based Compensation (Details) - Summary of Stock Option Activity (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Outstanding at January 1, 2013	1,216,809	1,107,712	1,198,516
Outstanding at January 1, 2013 (in Dollars per share)	$18.46	$18.98	$18.42
Granted	29,025	281,696	225,505
Granted (in Dollars per share)	$25.11	$18.11	$26.92
Exercised	-29,511	-52,676	-128,052
Exercised (in Dollars per share)	$20.14	$16.66	$16.48
Canceled/Expired	-7,499	-119,923	-188,257
Canceled/Expired (in Dollars per share)	$24.58	$23.21	$26.62
Outstanding at December 31, 2013	1,208,824	1,216,809	1,107,712
Outstanding at December 31, 2013 (in Dollars per share)	$18.54	$18.46	$18.98
Exercisable at December 31, 2013	933,738	758,270	690,449
Exercisable at December 31, 2013 (in Dollars per share)	$17.84	$16.80	$16.82
Expense recorded	$3	$4	$3.70
Unrecognized pre-tax expense	7.5	'	'
Remaining period for recognition	'1 year 10 months 24 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	1.7	2.1	2
Unrecognized pre-tax expense	$1.10	'	'
Remaining period for recognition	'1 year 4 months 24 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, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Amount collected from stock option exercises	$738	$1,054	$3,205
Total intrinsic value of stock option exercises	131	177	1,090
Tax benefit of stock option exercises recorded in additional paid-in-capital	-55	66	115
Aggregate intrinsic value of outstanding stock options	5,383	5,708	997
Aggregate intrinsic value of exercisable stock options	$4,695	$4,601	$763
Price Per Share For Intrinsic Value Calculation Stock Options (in Dollars per share)	$21.89	$22.19	$15.34
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)	2.8	'	'
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)	0.2	'	'

Note_7_Equitybased_Compensatio6

Note 7 - Equity-based Compensation (Details) - Binomial Option-Pricing Model Assumptions (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Grant-date fair value (in Dollars per share)	$12.92	$8.19	$11.61
Volatility	49.80%	45.10%	50.40%
Volatility, Minimum	'	43.00%	47.00%
Volatility, Maximum	'	45.20%	50.60%
Expected term (years)	'7 years	'7 years	'7 years
Dividend yield	0.00%	0.00%	0.00%
Risk-free rate	1.10%	1.50%	2.80%
Risk-free rate, Minimum	'	1.00%	2.30%
Risk-free rate, Maximum	'	1.50%	3.00%
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, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]	'	'	'
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$800,000	'	'
Undistributed Earnings of Foreign Subsidiaries	291,400,000	'	'
Deferred Tax Assets, Operating Loss Carryforwards	17,146,000	17,225,000	'
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	7,200,000	'	'
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	9,900,000	'	'
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	'	'
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	500,000	'	'
Deferred Tax Assets, Valuation Allowance	7,797,000	6,574,000	'
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	300,000	600,000	100,000
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	$300,000	'	'

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, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Before Tax, Domestic and Foreign [Abstract]	'	'	'
Domestic	$23,695	$45,290	$825
Foreign	35,307	25,576	32,145
Income before taxes on income	$59,002	$70,866	$32,970

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, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:	'	'	'
Federal	$8,603	$9,237	$1,789
Foreign	6,078	9,704	8,878
State	527	995	423
Subtotal	15,208	19,936	11,090
Deferred:	'	'	'
Federal	-2,075	-1,817	-2,064
Foreign	-727	69	492
State	-252	475	-1,334
Subtotal	-3,054	-1,273	-2,906
Total tax provision	$12,154	$18,663	$8,184

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, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]	'	'	'
Income taxes at U.S. federal statutory tax rate	$20,651	$24,803	$11,539
Change in the balance of the valuation allowance for deferred tax assets allocated to income tax expense	1,447	3,714	477
State income taxes, net of federal income tax benefit	179	956	-547
Domestic Production Activities Deduction	-1,548	-1,440	-52
Meals and entertainment	1,034	962	570
Changes in taxes previously accrued	-3,098	-2,422	263
Foreign tax rate differences	-4,892	-4,236	-3,412
Recognition of uncertain tax positions	-89	-800	-214
Total tax provision	12,154	18,663	8,184
Effective tax rate	20.60%	26.30%	24.80%
Acquisition-related Costs [Member]	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Transaction costs	0	509	574
Contingent Consideration Reversal [Member]	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Transaction costs	-1,461	-2,869	0
Other Matters [Member]	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Transaction costs	($69)	($514)	($1,014)

Note_8_Taxes_on_Income_Tax_Ben6

Note 8 - Taxes on Income (Tax Benefits) Net Deferred Taxes (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred income tax assets:	'	'
Foreign tax credit carryforwards	$535	$88
Net operating loss carryforwards	17,146	17,225
Accrued expenses	13,517	10,443
Other	8,158	8,394
Total gross deferred income tax assets	39,356	36,150
Less valuation allowance	-7,797	-6,574
Net deferred income tax assets	31,559	29,576
Deferred income tax liabilities:	'	'
Property, plant and equipment	-12,901	-14,051
Intangible assets	-34,983	-33,715
Undistributed foreign earnings	-7,051	-7,051
Other	-7,548	-8,579
Total deferred income tax liabilities	-62,483	-63,396
Net deferred income tax liabilities	-30,924	-33,820
Current deferred income tax assets, net	4,640	3,975
Current deferred income tax liabilities, net	-4,304	-5,994
Noncurrent deferred income tax assets, net	6,957	7,989
Noncurrent deferred income tax liabilities, net	($38,217)	($39,790)

Note_8_Taxes_on_Income_Tax_Ben7

Note 8 - Taxes on Income (Tax Benefits) Valuation Allowance Activity (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Allowance Activity [Abstract]	'	'	'
Balance, at beginning of year	$6,574	$4,691	$5,083
Additions	1,754	2,062	1,058
Reversals	-131	-191	-1,352
Other adjustments	-400	12	-98
Balance, at end of year	$7,797	$6,574	$4,691

Note_8_Taxes_on_Income_Tax_Ben8

Note 8 - Taxes on Income (Tax Benefits) Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]	'	'	'
Balance at January 1,	$3,170	$1,050	$1,672
Additions for tax positions of prior years related to acquisitions	30	111	41
Reductions for tax positions of prior years	0	0	-238
Lapse in statute of limitations	-236	-1,162	-406
Foreign currency translation	-28	26	-19
Balance at December 31,	2,936	3,170	1,050
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	$3,145	$0

Note_9_Commitments_and_Conting2

Note 9 - Commitments and Contingencies (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Operating Leases, Rent Expense	$19.50	$18.70	$21.30
Defined Benefit Plan, Contributions by Employer	0.3	0.6	'
Defined Benefit Plan, Benefit Obligation	7.9	7.8	'
Defined Benefit Plan, Fair Value of Plan Assets	9.6	9.1	'
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.40%	'	'
Defined Benefit Plan, Amounts Recognized in Balance Sheet	1.7	'	'
United States [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Defined Contribution Plan, Cost Recognized	4.5	3.7	3.2
Foreign [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Defined Contribution Plan, Cost Recognized	$1.20	$1.40	$1.20

Note_9_Commitments_and_Conting3

Note 9 - Commitments and Contingencies (Details) - Lease Payments (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Future Lease Payments Table [Abstract]	'
2014	$17,559
2015	13,509
2016	8,940
2017	5,457
2018	3,082
Thereafter	2,721
Total	$51,268

Note_10_Derivative_Financial_I2

Note 10 - Derivative Financial Instruments (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2013	Jul. 31, 2013	Jul. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Jul. 31, 2013	Jul. 02, 2013
						2011 Interest Rate Swap [Member]	2013 Interest Rate Swap [Member]	Cash Flow Hedging [Member]	2013 Credit Facility [Member]	2013 Credit Facility [Member]	2013 Credit Facility [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$100,000	$100,000	$100,000	$100,000	'	'	'	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	600,000	14,300,000	600,000	14,300,000	'	'	'	100,000	'	'	'
Derivative Asset, Notional Amount	'	'	'	'	'	83,000,000	175,000,000	'	'	'	'
Derivative, Variable Interest Rate	2.17%	'	2.17%	'	'	'	'	'	'	'	'
Derivative, Amount of Hedged Item	'	'	'	'	'	'	'	'	'	175,000,000	'
Secured Debt	'	'	'	'	'	'	'	'	$341,250,000	'	$350,000,000
Derivative, Fixed Interest Rate Percentage	0.87%	'	0.87%	'	0.87%	'	'	'	'	'	'

Note_10_Derivative_Financial_I3

Note 10 - Derivative Financial Instruments (Details) - Summary of the Fair Value Amounts of Derivative Instruments (Significant Observable Inputs (Level 2) [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Significant Observable Inputs (Level 2) [Member]	'	'
Derivatives Designated as Hedging Instruments	'	'
Forward Currency Contracts	$24	$0
Cash Flow Hedge Derivative Instrument Assets at Fair Value	24	0
Forward Currency Contracts	0	9
Interest Rate Swaps	1,220	764
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	1,220	773
Derivatives Not Designated as Hedging Instruments	'	'
Forward Currency Contracts	752	0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	752	0
Forward Currency Contracts	0	585
Total Derivative Assets	776	0
Total Derivative Liabilities	1,220	1,358
Derivative Assets (Liabilities), at Fair Value, Net	$444	$1,358

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 (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Significant Observable Inputs (Level 2) [Member]	'	'
Assets	'	'
Total Derivative Assets	$776	$0
Liabilities	'	'
Total Derivative Liabilities	1,220	1,358
Fair Value, Measurements, Recurring [Member]	'	'
Assets	'	'
Forward Currency Contracts	776	'
Total Derivative Assets	776	'
Liabilities	'	'
Forward Currency Contracts	'	594
Interest Rate Swap	1,220	764
Total Derivative Liabilities	1,220	1,358
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | Significant Observable Inputs (Level 2) [Member]	'	'
Assets	'	'
Forward Currency Contracts	776	'
Total Derivative Assets	776	'
Liabilities	'	'
Forward Currency Contracts	'	594
Interest Rate Swap	1,220	764
Total Derivative Liabilities	1,220	1,358
Fair Value, Measurements, Recurring [Member] | 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

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Canadian Dollar/USD [Member]

Canadian Dollar/USD [Member]

Singapore Dollar/USD [Member]

Singapore Dollar/USD [Member]

Hong Kong Dollar/USD [Member]

Hong Kong Dollar/USD [Member]

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]

Sell [Member]

Sell [Member]

Sell [Member]

USD ($)

USD ($)

USD ($)

USD ($)

GBP (£)

GBP (£)

USD ($)

Note 10 - Derivative Financial Instruments (Details) - Summary of the Company’s Derivative Positions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notional Amount

'

$10,208,460

'

$1,973,834

'

$1,558,146

'

$3,030,088

'

£ 1,900,000

'

£ 8,000,000

'

$170,625,000

Weighted Average Remaining Maturity In Years

'2 months 24 days

'

'11 months 20 days

'

'11 months 20 days

'

'11 months 20 days

'

'8 months 3 days

'

'5 months 28 days

'

'2 years 6 months 25 days

'

Average Exchange Rate

1.06

'

1.26

'

7.75

'

0.87

'

1.6533

'

0.8317

'

'

'

Note_11_Discontinued_Operation2

Note 11 - Discontinued Operations (Details) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013
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	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	'

Note_11_Discontinued_Operation3

Note 11 - Discontinued Operations (Details) - Operating Results for Discontinued Operations (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Closure charges of welding business	$100	'	'
Bayou Welding Works [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Revenues	9,763	11,132	12,819
Gross profit (loss)	-4,255	-645	445
Operating expenses	1,973	2,038	1,615
Closure charges of welding business	5,019	0	0
Operating loss	-11,247	2,683	-1,170
Loss before tax benefits	-10,731	-2,904	-1,206
Tax benefits	4,270	1,191	619
Net loss	($6,461)	($1,713)	($587)

Note_11_Discontinued_Operation4

Note 11 - Discontinued Operations (Details) - Balance Sheet Data for Discontinued Operations (USD $)	Dec. 31, 2013	Dec. 31, 2012
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	$55,021	$36,188
Bayou Welding Works [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Restricted cash	1,193	1,192
Receivables, net	4,038	4,380
Costs and estimated earnings in excess of billings	4	2,775
Inventories	0	386
Prepaid expenses and other current assets	200	253
Property, plant and equipment, less accumulated depreciation	1,118	2,803
Other assets	1,803	4,021
Total assets	8,356	15,810
Accounts payable	2,050	3,225
Accrued expenses	20	1,660
Deferred tax liability	197	0
Total liabilities	$2,267	$4,885

Note_12_Segment_and_Geographic2

Note 12 - Segment and Geographic Information (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	segment
	market
Note 12 - Segment Reporting (Details) [Line Items]	'	'	'
Number of Markets	3	'	'
Number of Reportable Segments	4	'	'
Business Combination, Acquisition Related Costs (in Dollars)	$5,831	$3,124	$6,372
Restructuring charges	$0	$0	$2,151
Water and Wastewater [Member]	'	'	'
Note 12 - Segment Reporting (Details) [Line Items]	'	'	'
Number of Geographic Segments	2	'	'

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, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Revenues

$315,679

[1]

$307,665

[1]

$242,100

$225,976

$271,595

[2]

$262,867

[2]

$254,490

[2]

$227,879

$1,091,420

$1,016,831

$925,766

Operating income (loss):

'

'

'

'

'

'

'

'

40,329

37,658

35,532

Operating income (loss)

22,209

[1]

22,032

[1]

15,823

6,818

25,097

[2]

26,865

[2]

18,654

[2]

11,187

66,882

81,803

45,707

Assets

'

'

'

'

'

'

'

'

'

'

'

Assets

1,362,918

'

'

'

1,217,894

'

'

'

1,362,918

1,217,894

1,124,964

Capital expenditures:

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Property, Plant, and Equipment

'

'

'

'

'

'

'

'

26,085

44,738

21,271

Energy And Mining [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

562,119

513,975

420,411

Operating income (loss):

'

'

'

'

'

'

'

'

21,954

18,175

16,106

Operating income (loss)

'

'

'

'

'

'

'

'

38,395

59,994

36,181

Assets

'

'

'

'

'

'

'

'

'

'

'

Assets

723,468

'

'

'

569,109

'

'

'

723,468

569,109

465,792

Capital expenditures:

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Property, Plant, and Equipment

'

'

'

'

'

'

'

'

15,367

34,796

11,092

North American Water And Wastewater [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

359,536

317,338

357,507

Operating income (loss):

'

'

'

'

'

'

'

'

8,398

8,886

9,405

Operating income (loss)

'

'

'

'

'

'

'

'

33,029

22,057

6,749

Assets

'

'

'

'

'

'

'

'

'

'

'

Assets

263,173

'

'

'

268,097

'

'

'

263,173

268,097

281,353

Capital expenditures:

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Property, Plant, and Equipment

'

'

'

'

'

'

'

'

4,858

3,023

3,378

International Water And Wastewater [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

109,602

111,035

130,734

Operating income (loss):

'

'

'

'

'

'

'

'

4,304

4,405

4,735

Operating income (loss)

'

'

'

'

'

'

'

'

208

-9,384

3,488

Assets

'

'

'

'

'

'

'

'

'

'

'

Assets

112,546

'

'

'

120,466

'

'

'

112,546

120,466

139,723

Capital expenditures:

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Property, Plant, and Equipment

'

'

'

'

'

'

'

'

3,500

4,382

3,706

Commercial And Structural [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

60,163

74,483

17,114

Operating income (loss):

'

'

'

'

'

'

'

'

3,850

4,509

1,183

Operating income (loss)

'

'

'

'

'

'

'

'

-4,750

9,136

-711

Assets

'

'

'

'

'

'

'

'

'

'

'

Assets

139,058

'

'

'

142,561

'

'

'

139,058

142,561

128,358

Capital expenditures:

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Property, Plant, and Equipment

'

'

'

'

'

'

'

'

470

443

43

Corporate and Other [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Operating income (loss):

'

'

'

'

'

'

'

'

1,823

1,683

4,103

Assets

'

'

'

'

'

'

'

'

'

'

'

Assets

116,317

'

'

'

101,851

'

'

'

116,317

101,851

96,336

Capital expenditures:

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Property, Plant, and Equipment

'

'

'

'

'

'

'

'

1,890

2,094

3,052

Discontinued Operations [Member]

'

'

'

'

'

'

'

'

'

'

'

Assets

'

'

'

'

'

'

'

'

'

'

'

Assets

$8,356

'

'

'

$15,810

'

'

'

$8,356

$15,810

$13,402

[1]

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

[2]

(2) Includes the financial results of Fyfe Asia, which was acquired in April 2012.

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, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Revenues

$315,679

[1]

$307,665

[1]

$242,100

$225,976

$271,595

[2]

$262,867

[2]

$254,490

[2]

$227,879

$1,091,420

$1,016,831

$925,766

Operating income (loss):

'

'

'

'

'

'

'

'

'

'

'

Operating income (loss)

22,209

[1]

22,032

[1]

15,823

6,818

25,097

[2]

26,865

[2]

18,654

[2]

11,187

66,882

81,803

45,707

Long-lived assets: (1)

'

'

'

'

'

'

'

'

'

'

'

Long-lived assets

205,719

[3]

'

'

'

210,497

[3]

'

'

'

205,719

[3]

210,497

[3]

192,316

[3]

United States [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

672,192

589,027

539,378

Operating income (loss):

'

'

'

'

'

'

'

'

'

'

'

Operating income (loss)

'

'

'

'

'

'

'

'

24,977

40,676

-1,042

Long-lived assets: (1)

'

'

'

'

'

'

'

'

'

'

'

Long-lived assets

154,367

[3]

'

'

'

151,337

[3]

'

'

'

154,367

[3]

151,337

[3]

144,151

[3]

Canada [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

179,236

180,283

178,739

Operating income (loss):

'

'

'

'

'

'

'

'

'

'

'

Operating income (loss)

'

'

'

'

'

'

'

'

28,955

31,376

31,892

Long-lived assets: (1)

'

'

'

'

'

'

'

'

'

'

'

Long-lived assets

28,539

[3]

'

'

'

28,724

[3]

'

'

'

28,539

[3]

28,724

[3]

22,998

[3]

Europe [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

90,646

86,883

102,471

Operating income (loss):

'

'

'

'

'

'

'

'

'

'

'

Operating income (loss)

'

'

'

'

'

'

'

'

6,276

6,196

9,391

Long-lived assets: (1)

'

'

'

'

'

'

'

'

'

'

'

Long-lived assets

10,007

[3]

'

'

'

16,396

[3]

'

'

'

10,007

[3]

16,396

[3]

12,474

[3]

Other foreign [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenues:

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

149,346

160,638

105,178

Operating income (loss):

'

'

'

'

'

'

'

'

'

'

'

Operating income (loss)

'

'

'

'

'

'

'

'

6,674

3,555

5,466

Long-lived assets: (1)

'

'

'

'

'

'

'

'

'

'

'

Long-lived assets

$12,806

[3]

'

'

'

$14,040

[3]

'

'

'

$12,806

[3]

$14,040

[3]

$12,693

[3]

[1]

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

[2]

(2) Includes the financial results of Fyfe Asia, which was acquired in April 2012.

[3]

Long-lived assets as of December 31, 2013, 2012 and 2011 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, 2013		Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Data - Income Statement [Abstract]	'		'		'	'	'		'		'		'	'	'	'
Revenues	$315,679	[1]	$307,665	[1]	$242,100	$225,976	$271,595	[2]	$262,867	[2]	$254,490	[2]	$227,879	$1,091,420	$1,016,831	$925,766
Gross profit	70,905	[1]	69,411	[1]	58,568	48,137	66,032	[2]	62,931	[2]	62,219	[2]	52,572	247,021	243,754	202,679
Operating income	22,209	[1]	22,032	[1]	15,823	6,818	25,097	[2]	26,865	[2]	18,654	[2]	11,187	66,882	81,803	45,707
Income from continuing operations	14,730	[1]	14,623	[1]	18,396	4,258	17,859	[2]	21,170	[2]	12,191	[2]	7,342	'	'	'
Loss from discontinued operations	-5	[1]	-558	[1]	-4,977	-921	-833	[2]	-435	[2]	-253	[2]	-192	'	'	'
Net income attributable to Aegion Corporation	$14,725	[1]	$14,065	[1]	$13,419	$3,337	$17,026	[2]	$20,735	[2]	$11,938	[2]	$7,150	$44,351	$52,661	$26,547
Basic earnings per share:	'		'		'	'	'		'		'		'	'	'	'
Income from continuing operations (in Dollars per share)	$0.38	[1]	$0.37	[1]	$0.47	$0.10	$0.40	[2]	$0.51	[2]	$0.30	[2]	$0.17	$1.31	$1.38	$0.68
Loss from discontinued operations (in Dollars per share)	$0	[1]	($0.01)	[1]	($0.13)	($0.03)	($0.02)	[2]	($0.01)	[2]	($0.01)	[2]	$0	($0.17)	($0.04)	($0.01)
Net income (in Dollars per share)	$0.38	[1]	$0.36	[1]	$0.34	$0.07	$0.38	[2]	$0.50	[2]	$0.29	[2]	$0.17	$1.14	$1.34	$0.67
Diluted earnings per share	'		'		'	'	'		'		'		'	'	'	'
Income from continuing operations (in Dollars per share)	$0.37	[1]	$0.37	[1]	$0.47	$0.09	$0.40	[2]	$0.50	[2]	$0.30	[2]	$0.17	$1.30	$1.37	$0.68
Loss from discontinued operations (in Dollars per share)	$0	[1]	($0.01)	[1]	($0.13)	($0.03)	($0.02)	[2]	($0.01)	[2]	($0.01)	[2]	$0	($0.17)	($0.04)	($0.01)
Net income (in Dollars per share)	$0.37	[1]	$0.36	[1]	$0.34	$0.06	$0.38	[2]	$0.49	[2]	$0.29	[2]	$0.17	$1.13	$1.33	$0.67
[1]	(1) Includes the financial results of Brinderson, which was acquired in July 2013.
[2]	(2) Includes the financial results of Fyfe Asia, which was acquired in April 2012.