Aegion 10-Q 31 Jul 14 2014 Q2 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 25, 2014
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'Aegion Corp	'
Document Type	'10-Q	'
Current Fiscal Year End Date	'--12-31	'
Entity Common Stock, Shares Outstanding	'	37,363,372
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	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues	$322,868	$242,100	$629,102	$468,076
Cost of revenues	250,950	183,532	496,121	361,371
Gross profit	71,918	58,568	132,981	106,705
Operating expenses	50,760	40,837	102,689	82,156
Acquisition-related expenses	539	1,908	539	1,908
Operating income	20,619	15,823	29,753	22,641
Other income (expense):	'	'	'	'
Interest expense	-3,320	-2,243	-6,435	-4,579
Interest income	125	46	377	118
Other	-687	7,169	-1,463	7,083
Total other income (expense)	-3,882	4,972	-7,521	2,622
Income before taxes on income	16,737	20,795	22,232	25,263
Taxes on income	3,961	3,709	5,573	4,821
Income before equity in earnings of affiliated companies	12,776	17,086	16,659	20,442
Equity in earnings of affiliated companies	0	1,310	677	2,212
Income from continuing operations	12,776	18,396	17,336	22,654
Loss from discontinued operations	-364	-4,977	-496	-5,898
Net income	12,412	13,419	16,840	16,756
Non-controlling interests	-26	-206	-57	-832
Net income attributable to Aegion Corporation	$12,386	$13,213	$16,783	$15,924
Basic:	'	'	'	'
Income from continuing operations (in Dollars per share)	$0.34	$0.47	$0.46	$0.56
Loss from discontinued operations (in Dollars per share)	($0.01)	($0.13)	($0.01)	($0.15)
Net income (in Dollars per share)	$0.33	$0.34	$0.45	$0.41
Diluted:	'	'	'	'
Income from continuing operations (in Dollars per share)	$0.33	$0.47	$0.45	$0.56
Loss from discontinued operations (in Dollars per share)	($0.01)	($0.13)	($0.01)	($0.15)
Net income (in Dollars per share)	$0.32	$0.34	$0.44	$0.41

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income	$12,412	$13,419	$16,840	$16,756
Other comprehensive income:	'	'	'	'
Currency translation adjustments	1,864	-686	-780	-10,354
Pension activity, net of tax	5	8	5	8
Deferred gain on hedging activity, net of tax	78	73	188	151
Total comprehensive income (loss)	14,359	12,814	16,253	6,561
Less: comprehensive income (loss) attributable to noncontrolling interests	-221	-35	-23	-550
Comprehensive income (loss) attributable to Aegion Corporation	$14,138	$12,779	$16,230	$6,011

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Deferred gain on hedging activity, tax	$51	$48	$124	$100

Consolidated_Balance_Sheets_Un

Consolidated Balance Sheets (Unaudited) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$146,146	$158,045
Restricted cash	575	483
Receivables, net of allowances of $3,501 and $3,441, respectively	229,158	231,775
Retainage	35,481	30,831
Costs and estimated earnings in excess of billings	105,131	79,999
Inventories	60,591	58,768
Prepaid expenses and other current assets	40,054	38,522
Current assets of discontinued operations	4,899	5,435
Total current assets	622,035	603,858
Property, plant & equipment, less accumulated depreciation	180,379	182,303
Other assets	'	'
Goodwill	349,912	348,680
Identified intangible assets, less accumulated amortization	203,758	209,283
Investments	0	9,101
Deferred income tax assets	6,981	6,957
Other assets	13,216	14,315
Total other assets	573,867	588,336
Non-current assets of discontinued operations	2,551	2,921
Total Assets	1,378,832	1,377,418
Current liabilities	'	'
Accounts payable	83,550	80,417
Accrued expenses	104,863	105,466
Billings in excess of costs and estimated earnings	27,789	24,978
Current maturities of long-term debt and line of credit	26,399	22,024
Current liabilities of discontinued operations	1,782	2,070
Total current liabilities	244,383	234,955
Long-term debt, less current maturities	353,300	366,616
Deferred income tax liabilities	38,539	38,217
Other non-current liabilities	12,324	10,512
Non-current liabilities of discontinued operations	238	197
Total liabilities	648,784	650,497
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 37,631,630 and 37,983,114 respectively	376	380
Additional paid-in capital	222,714	236,128
Retained earnings	487,591	470,808
Accumulated other comprehensive (loss) income	1,499	2,052
Total stockholders’ equity	712,180	709,368
Non-controlling interests	17,868	17,553
Total equity	730,048	726,921
Total Liabilities and Equity	$1,378,832	$1,377,418

Consolidated_Balance_Sheets_Un1

Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Allowance for doubtful accounts receivable	$2,829	$3,441
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)	37,631,630	37,983,114
Common stock, shares outstanding (in Shares)	37,631,630	37,983,114

Consolidated_Statements_of_Equ

Consolidated Statements of Equity (Unaudited) (USD $)

Total

Common Stock [Member]

Additional Paid-in Capital [Member]

Retained Earnings [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Noncontrolling Interest [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [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]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

In Thousands, except Share data, unless otherwise specified

Common Stock [Member]

Additional Paid-in Capital [Member]

Retained Earnings [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Noncontrolling Interest [Member]

Common Stock [Member]

Additional Paid-in Capital [Member]

Retained Earnings [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Noncontrolling Interest [Member]

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

16,756

0

0

15,924

0

832

'

'

'

'

'

'

'

'

'

'

'

'

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

'

29,511

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Issued During Period, Value, Stock Options Exercised

897

0

897

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Restricted shares issued

'

'

'

'

'

'

4

4

0

0

0

0

0

0

0

0

0

0

Restricted shares issued (in Shares)

'

'

'

'

'

'

'

398,497

'

'

'

'

'

11,112

'

'

'

'

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

'

3,171

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeitures of restricted shares

0

0

0

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Forfeitures of restricted shares (in Shares)

'

-13,992

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares repurchased and retired

15,822

-7

-15,815

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Shares repurchased and retired (in Shares)

'

-696,310

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity-based compensation expense

3,973

0

3,973

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Currency translation adjustment and derivative transactions, net

-10,195

0

0

0

-9,913

-282

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Jun. 30, 2013

711,733

387

246,264

442,381

5,347

17,354

'

'

'

'

'

'

'

'

'

'

'

'

Balance (in Shares) at Jun. 30, 2013

'

38,684,550

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

37,983,114

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income

16,840

0

0

16,783

0

57

'

'

'

'

'

'

'

'

'

'

'

'

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

322,173

322,173

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Issued During Period, Value, Stock Options Exercised

5,031

3

5,028

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Restricted shares issued

'

'

'

'

'

'

2

2

0

0

0

0

0

0

0

0

0

0

Restricted shares issued (in Shares)

'

'

'

'

'

'

'

222,944

'

'

'

'

'

15,277

'

'

'

'

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

'

30,594

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeitures of restricted shares

-1

-1

0

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Forfeitures of restricted shares (in Shares)

'

-59,632

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares repurchased and retired

20,661

-8

-20,653

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Shares repurchased and retired (in Shares)

'

-882,840

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity-based compensation expense

3,120

0

3,120

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests

-617

0

-909

0

0

292

'

'

'

'

'

'

'

'

'

'

'

'

Currency translation adjustment and derivative transactions, net

-587

0

0

0

-553

-34

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Jun. 30, 2014

$730,048

$376

$222,714

$487,591

$1,499

$17,868

'

'

'

'

'

'

'

'

'

'

'

'

Balance (in Shares) at Jun. 30, 2014

37,631,630

37,631,630

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consolidated_Statements_of_Cas

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

Note_1_General

Note 1 - General	6 Months Ended
	Jun. 30, 2014
Description of Business [Abstract]	'
General	'
	GENERAL
	The accompanying unaudited consolidated financial statements of Aegion Corporation and its subsidiaries (collectively, “Aegion” or the “Company”) reflect all adjustments (consisting only of normal recurring adjustments) that are, in the opinion of management, necessary for a fair presentation of the Company’s financial position as of June 30, 2014 and the results of operations and statements of comprehensive income for the quarters and six-month periods ended June 30, 2014 and 2013 and the statements of equity and cash flows for the six-month periods ended June 30, 2014 and 2013. The unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), the requirements of Form 10-Q and Article 10 of Regulation S-X and, consequently, do not include all information or footnotes required by GAAP for complete financial statements or all the disclosures normally made in an Annual Report on Form 10-K. Accordingly, the unaudited consolidated financial statements included herein should be read in conjunction with the audited consolidated financial statements and footnotes included in the Company’s 2013 Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 28, 2014.
	The results of operations for the quarter and six-month period ended June 30, 2014 are not necessarily indicative of the results to be expected for the full year.
	Acquisitions/Strategic Initiatives/Divestitures
	Energy and Mining Segment
	On March 31, 2014, the Company, through its subsidiary, The Bayou Companies, LLC (“Bayou”), sold its forty-nine percent (49%) interest in Bayou Coating, L.L.C. (“Bayou Coating”) to Stupp Brothers Inc. (“Stupp”), the holder of the remaining fifty-one percent (51%) interest in Bayou Coating. Stupp purchased the interest by exercising an existing option to acquire the Company’s interest in Bayou Coating at a purchase price equal to $9.1 million, which represented forty-nine percent (49%) of the book value of Bayou Coating as of December 31, 2013. Such book value was determined on the basis of Bayou Coating’s federal information tax return for 2013 and approximated the Company’s book value of its investment in Bayou Coating as of December 31, 2013. The Company had previously received an indication from Stupp of its intent to exercise such option and, in the second quarter of 2013 in connection with such indication, the Company recognized a non-cash charge of $2.7 million ($1.8 million post-tax) related to the goodwill allocated to the joint venture as part of the purchase price accounting associated with the 2009 acquisition of Bayou. The non-cash charge represented the Company’s then current estimate of the difference between the carrying value of the investment on the balance sheet and the amount the Company would receive in connection with the exercise. During the first quarter of 2014, the difference between the Company’s recorded gross equity in earnings of affiliated companies of approximately $1.2 million and the final equity distribution settlement of $0.7 million resulted in a loss of approximately $0.5 million that is recorded in other income (expense) on the consolidated statement of operations.
	Prior to March 2014, the Company held a fifty-nine (59%) equity interest in Delta Double Jointing, LLC (“Bayou Delta”) through which the Company offers pipe jointing and other services for the steel-coated pipe industry. The remaining forty-one percent (41%) was held by Bayou Coating. On March 31, 2014, the Company acquired this forty-one percent (41%) interest from Bayou Coating by exercising its existing option at a purchase price equal to $0.6 million. As a result, Bayou Delta is now a wholly owned subsidiary of the Company.
	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”). Brinderson is a leading integrated service provider of maintenance, construction, engineering and turnaround activities for the upstream and downstream oil and gas markets. The transaction purchase price was $150.0 million, which resulted in a cash purchase price at closing of $147.6 million after 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 $650.0 million senior secured credit facility as discussed in Note 5 of this report.
	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 the end of 2014.
	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 €14.0 million, approximately $18.3 million. The sale resulted in a gain on sale of approximately $11.3 million (net of $0.5 million of transaction expenses). 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.
	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, purchase price, growth opportunities and market potential. The goodwill associated with the Brinderson acquisition is deductible for tax purposes. At June 30, 2014, the Company had substantially completed its accounting for Brinderson with the exception of final working capital adjustments. During the second quarter of 2014, certain pre-acquisition matters were identified by the Company where a loss is both probable and reasonably estimable. Accordingly, the Company increased recorded goodwill by $14.5 million and adjusted its purchase price accounting retroactively to the measurement period, July 1, 2013. The Company has provided claim notices related to these uncertainties; however, no escrow receivable was recorded as of June 30, 2014. To the extent the Company receives notification or cash in future periods, these adjustments would be recorded through purchase accounting consistent with FASB ASC 805, Business Combinations. As the Company completes its final accounting for this acquisition, future adjustments related to working capital, escrow and related contingencies could occur.
	The Brinderson acquisition made the following contributions to the Company’s revenues and profits (in thousands):
		Quarter Ended			Six Months Ended
		30-Jun-14			30-Jun-14
	Revenues	$	72,685		$	148,587
	Net income	1,915			4,927
	The following unaudited pro forma summary presents combined information of the Company as if the Brinderson acquisition had occurred at the beginning of the year preceding its acquisition (in thousands):
		Quarter Ended			Six Months Ended
		30-Jun-13			30-Jun-13
	Revenues	$	291,981		$	578,177
	Net income (1)	13,705			21,987
	_____________________
	(1)	Includes pro-forma adjustments for purchase price depreciation and amortization as if those intangibles were recorded at the beginning of the year preceding the acquisition date.
	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 acquisition at its acquisition date (in thousands):
	Cash	$	3,842
	Receivables and cost and estimated earnings in excess of billings	28,353
	Prepaid expenses and other current assets	655
	Property, plant and equipment	6,848
	Identified intangible assets	60,210
	Other assets	1,071
	Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	(30,622		)
	Total identifiable net assets	$	70,357
	Total consideration recorded	$	147,605
	Less: total identifiable net assets	70,357
	Goodwill at June 30, 2014	$	77,248
	During the second quarter of 2014, and in connection with the 2012 acquisition of Fyfe Group LLC’s Asian operations (“Fyfe Asia”), the Company agreed to a working capital settlement with the previous owners, which increased the purchase price and related goodwill by $1.1 million.

Note_2_Accounting_Policies

Note 2 - Accounting Policies	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Accounting Policies	'
	ACCOUNTING POLICIES
	Revenues
	Revenues include construction, engineering and installation revenues that are recognized using the percentage-of-completion method of accounting in the ratio of costs incurred to estimated final costs. Revenues from change orders, extra work and variations in the scope of work are recognized when it is probable that they will result in additional contract revenue and when the amount can be reliably estimated. During the first six months of 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. 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 maintenance contracts under multi-year long-term Master Service Agreements and alliance contracts, as well as engineering and construction-type 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.
	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 June 30, 2014 and 2013, the Company had $2.5 million and $6.0 million, respectively, related to currency translation adjustments, $(0.8) million and $(0.5) million, respectively, related to derivative transactions and $(0.2) million and $(0.2) million, respectively, related to pension activity in accumulated other comprehensive income.
	Investments in Affiliated Companies
	On March 31, 2014, the Company, through Bayou, sold its forty-nine percent (49%) interest in Bayou Coating to Stupp, the holder of the remaining fifty-one percent (51%) interest in Bayou Coating. Stupp purchased the interest by exercising an existing option to acquire the Company’s interest in Bayou Coating at a purchase price equal to $9.1 million. The Company had previously received an indication from Stupp of its intent to exercise such option and, in the second quarter of 2013 in connection with such indication, the Company recognized a non-cash charge of $2.7 million ($1.8 million post-tax) related to the goodwill allocated to the joint venture as part of the purchase price accounting associated with the 2009 acquisition of Bayou. The non-cash charge represented the Company’s then current estimate of the difference between the carrying value of the investment on the balance sheet and the amount the Company would receive in connection with the exercise. During the first quarter of 2014, the difference between the Company’s recorded gross equity in earnings of affiliated companies of approximately $1.2 million and the final equity distribution settlement of $0.7 million resulted in a loss of approximately $0.5 million that is recorded in other income (expense) on the consolidated statement of operations.
	Prior to March 2014, the Company held a fifty-nine (59%) equity interest in Bayou Delta through which the Company offers pipe jointing and other services for the steel-coated pipe industry. The remaining forty-one percent (41%) was held by Bayou Coating. On March 31, 2014, the Company acquired this forty-one percent (41%) interest from Bayou Coating by exercising its existing option at a purchase price equal to $0.6 million. As a result, Bayou Delta is now a wholly owned subsidiary of the Company.
	In June 2013, the Company sold its fifty percent (50%) interest in Insituform-Germany to Aarsleff. Insituform-Germany, a company that was jointly owned by Aegion and Aarsleff, is active in the business of no-dig pipe rehabilitation in Germany, Slovakia and Hungary. The sale price was €14.0 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). In connection with the sale, Insituform-Germany also entered into a tube supply agreement with the Company whereby Insituform-Germany will purchase on an annual basis at least GBP 2.3 million, approximately $3.6 million, of felt cured-in-place pipe (“CIPP”) liners during the two-year period from June 26, 2013 to June 30, 2015.
	The Company, through its subsidiary, Insituform Technologies Netherlands BV, owns a forty-nine percent (49%) equity interest in WCU Corrosion Technologies Pte. Ltd. (“WCU”). WCU offers the Company’s Tite Liner® process in the oil and gas sector and onshore corrosion services in Asia and Australia.
	Investments in entities in which the Company does not have control or is not the primary beneficiary of a variable interest entity, and for which the Company has 20% to 50% ownership or has the ability to exert significant influence, are accounted for by the equity method. At December 31, 2013, the investment in affiliated companies on the Company’s consolidated balance sheets was $9.1 million. Due to the sale of Bayou Coating, the balance was zero at June 30, 2014.
	Net income presented below for the quarters ended June 30, 2014 and 2013 includes Bayou Coating’s previously held forty-one percent (41%) interest in Bayou Delta, which is eliminated for purposes of determining the Company’s equity in earnings of affiliated companies because Bayou Delta is consolidated in the Company’s financial statements as a result of its additional ownership through another Company subsidiary.
	The Company’s equity in earnings of affiliated companies for all periods presented below includes acquisition-related depreciation and amortization expense and is net of income taxes associated with these earnings. Financial data for these investments in affiliated companies for each of the six month periods ended June 30, 2014 and 2013 is summarized in the following table (in thousands):
		Six Months Ended June 30,
	Income statement data	2014			2013 (1)
	Revenue	$	9,088		$	60,845
	Gross profit	3,489			14,699
	Net income	2,413			7,784
	Equity in earnings of affiliated companies	677			2,212
	_____________________
	(1)    Includes the financial data of Insituform-Germany.
	Investments in Variable Interest Entities
	The Company evaluates all transactions and relationships with variable interest entities (“VIE”) to determine whether the Company is the primary beneficiary of the entities in accordance with FASB ASC 810, Consolidation.
	The Company’s overall methodology for evaluating transactions and relationships under the VIE requirements includes the following two steps:
	•	determine whether the entity meets the criteria to qualify as a VIE; and
	•	determine whether the Company is the primary beneficiary of the VIE.
	In performing the first step, the significant factors and judgments that the Company considers in making the determination as to whether an entity is a VIE include:
	•	the design of the entity, including the nature of its risks and the purpose for which the entity was created, to determine the variability that the entity was designed to create and distribute to its interest holders;
	•	the nature of the Company’s involvement with the entity;
	•	whether control of the entity may be achieved through arrangements that do not involve voting equity;
	•	whether there is sufficient equity investment at risk to finance the activities of the entity; and
	•	whether parties other than the equity holders have the obligation to absorb expected losses or the right to receive residual returns.
	If the Company identifies a VIE based on the above considerations, it then performs the second step and evaluates whether it is the primary beneficiary of the VIE by considering the following significant factors and judgments:
	•	whether the entity has the power to direct the activities of a variable interest entity that most significantly impact the entity’s economic performance; and
	•	whether the entity has the obligation to absorb losses of the entity that could potentially be significant to the variable interest entity or the right to receive benefits from the entity that could potentially be significant to the variable interest entity.
	Based on its evaluation of the above factors and judgments, as of June 30, 2014, the Company consolidated any VIEs in which it was the primary beneficiary.
	Financial data for consolidated variable interest entities are summarized in the following table (in thousands):
	Balance sheet data	June 30,			December 31,
		2014			2013
	Current assets	$	52,563		$	55,960
	Non-current assets	46,203			47,606
	Current liabilities	23,964			27,335
	Non-current liabilities	34,761			36,761
		Six Months Ended June 30,
	Income statement data	2014			2013
	Revenue	$	35,482		$	38,429
	Gross profit	4,475			6,645
	Net income	(341		)	467
	Newly Issued Accounting Pronouncements
	In April 2014, the FASB issued guidance that changes the criteria for determining which disposals can be presented as discontinued operations and modifies the related disclosure requirements. Under the new guidance, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results and is disposed of or classified as held for sale. The standard also introduces several new disclosures. The guidance applies prospectively to new disposals and new classifications of disposal groups as held for sale after the effective date and is effective for annual and interim periods beginning after December 15, 2014, with earlier adoption permitted. The Company does not expect that the adoption of this standard will have a material effect on its financial statements.
	In May 2014, the FASB issued guidance that supersedes revenue recognition requirements regarding contracts with customers to transfer goods or services or for the transfer of nonfinancial assets. Under the new guidance, entities are required to recognize revenue in order to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides a five-step analysis to be performed on transactions to determine when and how revenue is recognized. This new guidance is effective retroactively in fiscal years beginning after December 15, 2016. The Company is currently evaluating the effect the guidance will have on its financial condition and results of operations.

Note_3_Share_Information

Note 3 - Share Information	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Share Information	'
	SHARE INFORMATION
	Earnings per share have been calculated using the following share information:
		Quarters Ended June 30,		Six Months Ended June 30,
		2014	2013	2014	2013
	Weighted average number of common shares used for basic EPS	37,893,170	38,960,439	37,928,548	38,919,551
	Effect of dilutive stock options and restricted and deferred stock unit awards	357,028	358,390	378,099	391,838
	Weighted average number of common shares and dilutive potential common stock used in dilutive EPS	38,250,198	39,318,829	38,306,647	39,311,389
	The Company excluded 200,725 and 324,605 stock options for the quarters ended June 30, 2014 and 2013, respectively, and 200,725 and 159,639 stock options for the six-month periods ended June 30, 2014 and 2013, 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.

Note_4_Goodwill_and_Intangible

Note 4 - Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Identified Intangible Assets	'
	GOODWILL AND IDENTIFIED INTANGIBLE ASSETS
	Goodwill and identified intangible assets consist of the following:
	Goodwill
	(In millions)
		Energy and				Water and				Commercial				Total
		Mining				Wastewater				and Structural
	Beginning balance at January 1, 2014	$	153.1			$	130.1			$	65.5			$	348.7
	Additions to goodwill through acquisitions (1)	—				—				1.1				1.1
	Foreign currency translation	(0.1		)		0.2				0.1				0.1
	Balance at June 30, 2014 (2)	$	153			$	130.3			$	66.7			$	349.9
	__________________________
	(1)	During the second quarter of 2014, the Company recorded goodwill of $1.1 million related to the 2012 acquisition of Fyfe Asia (see Note 1).
	(2)	The Company does not have any accumulated impairment charges.
	Identified Intangible Assets
	(In thousands)			30-Jun-14												31-Dec-13
		Weighted Average Useful Lives (Years)		Gross Carrying Amount				Accumulated Amortization				Net Carrying Amount				Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	License agreements	6		$	3,917			$	(3,058	)		$	859			$	3,917	$	(2,977	)	$	940
	Backlog	0		4,744				(4,744		)		—				4,745		(4,745		)	—
	Leases	13		2,067				(551		)		1,516				2,067		(477		)	1,590
	Trademarks	16		21,521				(4,682		)		16,839				21,394		(4,167		)	17,227
	Non-competes	4		1,140				(796		)		344				1,140		(753		)	387
	Customer relationships	14		182,832				(33,729		)		149,103				182,703		(28,287		)	154,416
	Patents and acquired technology	17		59,022				(23,925		)		35,097				57,419		(22,696		)	34,723
				$	275,243			$	(71,485	)		$	203,758			$	273,385	$	(64,102	)	$	209,283
	Amortization expense was $3.6 million and $2.6 million for the quarters ended June 30, 2014 and 2013, respectively, and $7.0 million and $5.1 million for the six-month periods ended June 30, 2014 and 2013, respectively. Estimated amortization expense by year is as follows (in thousands):
	2014		$	14,364
	2015		14,652
	2016		14,651
	2017		14,612
	2018		14,534

Note_5_LongTerm_Debt_and_Credi

Note 5 - Long-Term Debt and Credit Facility	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Long-Term Debt and Credit Facility	'
	LONG-TERM DEBT AND CREDIT FACILITY
	Financing Arrangements
	In July 2013, in connection with the Brinderson acquisition, the Company entered into a $650.0 million senior secured credit facility (the “Credit Facility”) with a syndicate of banks. Bank of America, N.A. served as the administrative agent. Merrill Lynch Pierce Fenner & Smith Incorporated, JPMorgan Securities LLC and U.S. Bank National Association acted as joint lead arrangers and joint book managers in the syndication of the Credit Facility. The Credit Facility consists of a $300.0 million five-year revolving line of credit and a $350.0 million five-year term loan facility, each with a maturity date of July 1, 2018. The Company borrowed the entire term loan and drew $35.5 million against the revolving line of credit from the Credit Facility on July 1, 2013 for the following purposes: (1) to pay the $147.6 million cash purchase price for the Company’s acquisition of Brinderson, L.P. and related entities, which closed on July 1, 2013; (2) to retire $232.3 million in indebtedness outstanding under the Company’s prior credit facility; and (3) to fund expenses associated with the Credit Facility and the Brinderson acquisition. Additionally, the Company used $7.0 million of its cash on hand to fund these transactions.
	Generally, interest will be charged on the principal amounts outstanding under the Credit Facility at the British Bankers Association LIBOR rate plus an applicable rate ranging from 1.25% to 2.25% depending on the Company’s consolidated leverage ratio. The Company can also opt for an interest rate equal to a base rate (as defined in the credit documents) plus an applicable rate, which also is based on the Company’s consolidated leverage ratio. The applicable one month LIBOR borrowing rate (LIBOR plus Company’s applicable rate) as of June 30, 2014 was approximately 2.00%.
	The Company’s indebtedness at June 30, 2014 consisted of $332.5 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”) 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 are classified as long-term debt as of June 30, 2014. 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, $4.7 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 June 30, 2014.
	As of June 30, 2014, the Company had $21.5 million in letters of credit issued and outstanding under the Credit Facility. Of such amount, $12.1 million was collateral for the benefit of certain of our insurance carriers and $9.4 million was for letters of credit or bank guarantees of performance or payment obligations of foreign subsidiaries.
	The Company’s indebtedness at December 31, 2013 consisted of $341.3 million outstanding from the $350.0 million term loan under the Credit Facility and $35.5 million on the line of credit under the Credit Facility. Additionally, the Company and Wasco Energy loaned Bayou Wasco an aggregate of $14.0 million for the purchase of capital assets in 2012 and 2013, of which $6.9 million (representing funds loaned by Wasco Energy) was designated as third-party debt in the consolidated financial statements. In February 2014, the Company and Wasco Energy agreed to a five-year term on the funds loaned; therefore, the amounts were reclassified to long-term debt as of December 31, 2013. In connection with the formation of BPPC, the Company and Perma-Pipe Canada, Inc. loaned BPPC an aggregate of $8.0 million for the purchase of capital assets and for operating purposes. Additionally, during January 2012, the Company and Perma-Pipe Canada, Inc. agreed to loan BPPC an additional $6.2 million for the purchase of capital assets increasing the total to $14.2 million. Of such amount, $4.9 million was designated as third-party debt in the Company’s consolidated financial statements. The Company also held $0.1 million of third party notes and bank debt at December 31, 2013.
	At June 30, 2014 and December 31, 2013, the estimated fair value of the Company’s long-term debt was approximately $380.6 million and $380.1 million, respectively. Fair value was estimated using market rates for debt of similar risk and maturity and a discounted cash flow model, which are based on Level 3 inputs as defined in Note 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 June 30, 2014 was approximately 2.19%. 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 exceed 3.75 to 1.00, but decreased, as scheduled, to not more that 3.50 to 1.00 for the quarter ended June 30, 2014. At June 30, 2014, the Company’s consolidated financial leverage ratio was 2.97 to 1.00 and, using the Credit Facility defined income, the Company had the capacity to borrow up to approximately $68.3 million of additional debt.
	•	Consolidated fixed charge coverage ratio compares Credit Facility defined income to Credit Facility defined fixed charges with a minimum permitted ratio of not less than 1.25 to 1.00. At June 30, 2014, the Company’s fixed charge ratio was 1.34 to 1.00.
	At June 30, 2014, the Company was in compliance with all of its debt and financial covenants as required under the Credit Facility.

Note_6_Stockholders_Equity_and

Note 6 - Stockholders' Equity and Equity Compensation	6 Months Ended
	Jun. 30, 2014
Shareholders' Equity and Share-based Payments [Abstract]	'
Stockholders' Equity and Equity Compensation	'
	STOCKHOLDERS’ EQUITY AND EQUITY COMPENSATION
	Share Repurchase Plan
	In February 2014, the Company’s Board of Directors authorized the open market repurchase of up to $20.0 million of the Company’s common stock to be made during 2014. Once a repurchase is complete, the Company promptly retires the shares. The Company also is authorized to 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 the six months ended June 30, 2014, the Company acquired 591,923 shares of the Company’s common stock for $13.8 million ($23.36 average price per share) through the open market repurchase program discussed above and 290,917 shares of the Company’s common stock for $6.8 million ($23.49 average price per share) in connection with the satisfaction of tax obligations in connection with the vesting of restricted stock, exercise of stock options and distribution of deferred stock units. Once repurchased, the Company immediately retired all such shares.
	Equity-Based Compensation Plans
	At June 30, 2014, the Company had two active equity-based compensation plans under which awards may be made, including stock appreciation rights, restricted shares of common stock, performance awards, stock options and stock units. The Company’s 2013 Employee Equity Incentive Plan (the “2013 Employee Plan”) has 2,895,000 shares of the Company’s common stock reserved for issuance and, at June 30, 2014, 1,968,999 shares of common stock were available for issuance. The Company’s 2011 Non-Employee Director Equity Incentive Plan (“2011 Director Plan”) has 250,000 shares of the Company’s common stock registered for issuance and, at June 30, 2014, 135,396 shares of common stock were available for issuance.
	Stock Awards
	Stock awards, which include shares of restricted stock, restricted stock units and restricted performance units, are awarded from time to time to executive officers and certain key employees of the Company. Stock award compensation is recorded based on the award date fair value and charged to expense ratably through the requisite service period. The forfeiture of unvested restricted stock, restricted stock units and restricted performance units causes the reversal of all previous expense recorded as a reduction of current period expense.
	The following table summarizes all stock award activity during the six months ended June 30, 2014:
		Stock Awards			Weighted
					Average
					Award Date
					Fair Value
	Outstanding at January 1, 2014	555,025			$	22.79
	Restricted shares awarded	222,944			24.19
	Restricted stock units awarded	230,324			24.21
	Restricted shares distributed	(115,676	)		23.66
	Restricted stock units distributed	(15,277	)		21.25
	Restricted shares forfeited	(59,632	)		23.44
	Restricted stock units forfeited	(96,976	)		24.66
	Outstanding at June 30, 2014	720,732			$	23.26
	Expense associated with stock awards was $1.9 million and $2.1 million in the six months ended June 30, 2014 and 2013, respectively. Unrecognized pre-tax expense of $12.8 million related to stock awards is expected to be recognized over the weighted average remaining service period of 2.28 years for awards outstanding at June 30, 2014.
	Expense associated with stock awards was $1.0 million and $0.9 million for the quarters ended June 30, 2014 and 2013, respectively.
	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 summaries all deferred stock unit activity during the six months ended June 30, 2014:
		Deferred			Weighted
		Stock			Average
		Units			Award Date
					Fair Value
	Outstanding at January 1, 2014	214,455			$	19.56
	Awarded	32,904			23.96
	Distributed	(30,594	)		19.62
	Outstanding at June 30, 2014	216,765			$	20.19
	Expense associated with awards of deferred stock units for the quarters and six months ended June 30, 2014 or 2013 was $0.8 million and $0.9 million, respectively.
	Stock Options
	Stock options on the Company’s common stock are awarded from time to time to executive officers and certain key employees of the Company. Stock options granted generally have a term of seven to ten years and an exercise price equal to the market value of the underlying common stock on the date of grant.
	The following table summarizes all stock option activity during the six months ended June 30, 2014:
		Shares			Weighted
					Average
					Exercise
					Price
	Outstanding at January 1, 2014	1,208,824			$	18.54
	Granted	38,820			24.21
	Exercised	(322,173	)		14.15
	Canceled/Expired	(110,798	)		23.03
	Outstanding at June 30, 2014	814,673			$	19.93
	Exercisable at June 30, 2014	743,540			$	20.06
	Expense associated with stock option grants was $0.1 million and $0.4 million in the quarters ended June 30, 2014 and 2013, respectively. In the six months ended June 30, 2014 and 2013, the Company recorded expense of $0.5 million and $1.0 million, respectively, related to stock option grants. Unrecognized pre-tax expense of $0.4 million related to stock option grants is expected to be recognized over the weighted average remaining contractual term of 1.02 years for awards outstanding at June 30, 2014.
	Financial data for stock option exercises are summarized in the following table (in thousands):
		Six Months Ended June 30,
		2014				2013
	Amount collected from stock option exercises	$	7,645			$	738
	Total intrinsic value of stock option exercises	3,088				131
	Tax benefit (expense) of stock option exercises recorded in additional paid-in-capital	(459		)		55
	Aggregate intrinsic value of outstanding stock options	3,452				5,877
	Aggregate intrinsic value of exercisable stock options	3,113				5,062
	The intrinsic value calculations are based on the Company’s closing stock price of $23.27 and $22.51 on June 30, 2014 and 2013, 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 the six-month periods ended June 30, 2014 and 2013 were 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.
		Six Months Ended June 30,
		2014		2013
	Grant-date fair value	$11.27		$12.92
	Volatility	41.60%		49.80%
Expected term (years)	7		7
Dividend yield	—%		—%
Risk-free rate	2.30%		1.10%

Note_7_Commitments_and_Conting

Note 7 - Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	Litigation
	The Company is involved in certain litigation incidental to the conduct of its business and affairs. Management, after consultation with legal counsel, does not believe that the outcome of any such litigation, individually or in the aggregate, will have a material adverse effect on the Company’s consolidated financial condition, results of operations or cash flows.
	Contingencies
	In connection with the Brinderson acquisition, certain pre-acquisition matters were identified during the quarter ended June 30, 2014 where a loss is both probable and reasonably estimable. The Company has identified the range of possible loss from zero to $24 million. The Company establishes liabilities in accordance with FASB ASC Subtopic No. 450-20, Contingencies – Loss Contingencies, and, accordingly, recorded a $14.5 million accrual for such matters as part of its purchase price accounting for Brinderson (see Note 1). The Company believes it has meritorious defenses against certain of these matters.
	Purchase Commitments
	The Company had no material purchase commitments at June 30, 2014.
	Guarantees
	The Company has many contracts that require the Company to indemnify the other party against loss from claims, including claims of patent or trademark infringement or other third party claims for injuries, damages or losses. The Company has agreed to indemnify its surety against losses from third-party claims of subcontractors. The Company has not previously experienced material losses under these provisions and, while there can be no assurances, currently does not anticipate any future material adverse impact on its consolidated financial position, results of operations or cash flows.
	The Company regularly reviews its exposure under all its engagements, including performance guarantees by contractual joint ventures and indemnification of its surety. As a result of the most recent review, the Company has determined that the risk of material loss is remote under these arrangements and has not recorded a liability for these risks at June 30, 2014 on its consolidated balance sheet.

Note_8_Segment_Reporting

Note 8 - Segment Reporting	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Segment Reporting	'
	SEGMENT REPORTING
	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 such, the Company is organized into three reportable segments: Energy and Mining; Water and Wastewater; and Commercial and Structural. Each reportable segment has a senior operating vice president who reports to the chief operating decision maker (“CODM”). The operating results and financial information reported by each segment are evaluated separately, regularly reviewed and used by the CODM to evaluate segment performance, allocate overall resources and determine management incentive compensation.
	During the first quarter of 2014, the Company reorganized its North American Water and Wastewater and International Water and Wastewater reportable segments into a single, reportable segment titled Water and Wastewater. As a result of this reorganization, the entire Water and Wastewater segment reports to the Senior Vice President - Water and Wastewater, who, in turn, reports to the CODM. All future filings will combine these two previously reported segments into a single Waste and Wastewater segment.
	The following disaggregated financial results have been prepared using a management approach that is consistent with the basis and manner with which management internally disaggregates financial information for the purpose of making internal operating decisions. Financial results for discontinued operations have been removed for all periods presented. The Company evaluates performance based on stand-alone operating income (loss).
	Financial information by segment was as follows (in thousands):
		Quarters Ended June 30,				Six Months Ended June 30,
		2014		2013		2014			2013
	Revenues:
	Energy and Mining	$	175,608	$	108,592	$	359,518		$	217,283
	Water and Wastewater	129,710		115,736		235,843			219,531
	Commercial and Structural	17,550		17,772		33,741			31,262
	Total revenues	$	322,868	$	242,100	$	629,102		$	468,076
	Gross profit:
	Energy and Mining	$	35,967	$	26,294	$	71,476		$	50,560
	Water and Wastewater	29,257		25,576		49,359			44,737
	Commercial and Structural	6,694		6,698		12,146			11,408
	Total gross profit	$	71,918	$	58,568	$	132,981		$	106,705
	Operating income (loss):
	Energy and Mining	$	7,743	$	6,156	$	15,418		$	11,607
	Water and Wastewater	12,654		9,040		15,674			11,602
	Commercial and Structural	222		627		(1,339		)	(568		)
	Total operating income	$	20,619	$	15,823	$	29,753		$	22,641
	The following table summarizes revenues, gross profit and operating income by geographic region (in thousands):
		Quarters Ended June 30,				Six Months Ended June 30,
		2014		2013		2014			2013
	Revenues(1):
	United States	$	227,618	$	155,444	$	438,248		$	294,191
	Canada	42,212		35,752		84,075			75,146
	Europe	21,175		22,337		43,791			44,987
	Other foreign	31,863		28,567		62,988			53,752
	Total revenues	$	322,868	$	242,100	$	629,102		$	468,076
	Gross profit:
	United States	$	50,891	$	38,055	$	92,284		$	67,168
	Canada	9,934		8,100		18,996			17,402
	Europe	4,543		5,680		9,301			10,684
	Other foreign	6,550		6,733		12,400			11,451
	Total gross profit	$	71,918	$	58,568	$	132,981		$	106,705
	Operating income:
	United States	$	11,693	$	7,231	$	14,089		$	7,126
	Canada	6,129		4,477		11,552			10,225
	Europe	851		1,955		1,378			2,823
	Other foreign	1,946		2,160		2,734			2,467
	Total operating income	$	20,619	$	15,823	$	29,753		$	22,641
	__________________________
	(1)	Revenues are attributed to the country of origin for the Company’s legal entities. For a significant majority of its legal entities, the country of origin relates to the country or geographic area that it services.

Note_9_Discontinued_Operations

Note 9 - Discontinued Operations	6 Months Ended
	Jun. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Discontinued Operations	'
	DISCONTINUED OPERATIONS
	During the second quarter of 2013, the Company’s Board of Directors approved a plan of liquidation for its 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 of this report. 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 the end of 2014.
	Operating results for discontinued operations are summarized as follows (in thousands):
		Quarters Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
	Revenues	$	—		$	2,444		$	—		$	8,120
	Gross loss	(46		)	(2,161		)	(67		)	(3,240		)
	Operating expenses	200			1,159			402			1,618
	Closure charges of welding business	—			5,019			—			5,019
	Operating loss	(246		)	(8,339		)	(469		)	(9,877		)
	Other income (expense)	(73		)	211			(73		)	182
	Loss before income tax	(319		)	(8,128		)	(542		)	(9,695		)
	Tax (expense) benefit	(45		)	3,151			46			3,797
	Net loss	(364		)	(4,977		)	(496		)	(5,898		)
	Balance sheet data for discontinued operations was as follows (in thousands):
		June 30,			December 31,
		2014			2013
	Restricted cash	$	1,193		$	1,193
	Receivables, net	3,484			4,038
	Prepaid expenses and other current assets	222			204
	Property, plant and equipment, less accumulated depreciation	955			1,118
	Deferred tax assets	1,596			1,803
	Total assets	$	7,450		$	8,356
	Accounts payable	$	1,566		$	2,050
	Accrued expenses	216			20
	Deferred tax liabilities	238			197
	Total liabilities	$	2,020		$	2,267

Note_10_Derivative_Financial_I

Note 10 - Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Financial Instruments	'
	DERIVATIVE FINANCIAL INSTRUMENTS
	As a matter of policy, the Company uses derivatives for risk management purposes, and does not use derivatives for speculative purposes. From time to time, the Company may enter into foreign currency forward contracts to hedge foreign currency cash flow transactions. For cash flow hedges, gain or loss is recorded in the consolidated statements of operations upon settlement of the hedge. All of the Company’s hedges that are designated as hedges for accounting purposes were highly effective; therefore, no notable amounts of hedge ineffectiveness were recorded in the Company’s consolidated statements of operations for the outstanding hedged balance. During each of the quarters ended June 30, 2014 and 2013, the Company recorded less than $0.1 million as a gain on the consolidated statements of operations in the other income (expense) line item upon settlement of the cash flow hedges. At June 30, 2014, the Company recorded a net deferred gain of $0.4 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 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		June 30,				December 31,
					2014				2013
	Derivatives Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	385			$	24
			Total Assets		$	385			$	24
	Interest Rate Swaps		Other non-current liabilities		$	1,229			$	1,220
			Total Liabilities		$	1,229			$	1,220
	Derivatives Not Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	265			$	878
			Total Assets		$	265			$	878
			Total Derivative Assets		$	650			$	902
			Total Derivative Liabilities		1,229				1,220
			Total Net Derivative Liability		$	579			$	318
	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
		30-Jun-14				(Level 1)				(Level 2)		(Level 3)
	Assets:
	Forward Currency Contracts	$	650			$	—			$	650	$	—
	Total	$	650			$	—			$	650	$	—
	Liabilities:
	Interest Rate Swap	$	1,229			$	—			$	1,229	$	—
	Total	$	1,229			$	—			$	1,229	$	—
		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	$	902			$	—			$	902	$	—
	Total	$	902			$	—			$	902	$	—
	Liabilities:
	Interest Rate Swap	$	1,220			$	—			$	1,220	$	—
	Total	$	1,220			$	—			$	1,220	$	—
	The following table summarizes the Company’s derivative positions at June 30, 2014:
		Position		Notional				Weighted		Average
				Amount				Average		Exchange
								Remaining		Rate
								Maturity
								In Years
	Canadian Dollar/USD	Sell		$	37,151,612			0.4		1.07
	Singapore Dollar/USD	Sell		$	1,973,834			0.5		1.25
	Hong Kong Dollar/USD	Sell		$	1,558,146			0.5		7.75
	Australian Dollar/USD	Sell		$	3,030,088			0.5		0.93
	USD/British Pound	Sell		£	1,900,000			0.2		1.71
	EURO/British Pound	Sell		£	8,000,000			0.5		0.8
	Interest Rate Swap			$	166,250,000			2.1
	The Company had no transfers between Level 1, 2 or 3 inputs during the six months ended June 30, 2014. Certain financial instruments are required to be recorded at fair value. Changes in assumptions or estimation methods could affect the fair value estimates; however, 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_2_Accounting_Policies_Pol

Note 2 - Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Revenues	'
	Revenues
	Revenues include construction, engineering and installation revenues that are recognized using the percentage-of-completion method of accounting in the ratio of costs incurred to estimated final costs. Revenues from change orders, extra work and variations in the scope of work are recognized when it is probable that they will result in additional contract revenue and when the amount can be reliably estimated. During the first six months of 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. 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 maintenance contracts under multi-year long-term Master Service Agreements and alliance contracts, as well as engineering and construction-type 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.
Foreign Currency Transaction	'
	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 June 30, 2014 and 2013, the Company had $2.5 million and $6.0 million, respectively, related to currency translation adjustments, $(0.8) million and $(0.5) million, respectively, related to derivative transactions and $(0.2) million and $(0.2) million, respectively, related to pension activity in accumulated other comprehensive income.
Investments in Affiliated Companies	'
	Investments in Affiliated Companies
	On March 31, 2014, the Company, through Bayou, sold its forty-nine percent (49%) interest in Bayou Coating to Stupp, the holder of the remaining fifty-one percent (51%) interest in Bayou Coating. Stupp purchased the interest by exercising an existing option to acquire the Company’s interest in Bayou Coating at a purchase price equal to $9.1 million. The Company had previously received an indication from Stupp of its intent to exercise such option and, in the second quarter of 2013 in connection with such indication, the Company recognized a non-cash charge of $2.7 million ($1.8 million post-tax) related to the goodwill allocated to the joint venture as part of the purchase price accounting associated with the 2009 acquisition of Bayou. The non-cash charge represented the Company’s then current estimate of the difference between the carrying value of the investment on the balance sheet and the amount the Company would receive in connection with the exercise. During the first quarter of 2014, the difference between the Company’s recorded gross equity in earnings of affiliated companies of approximately $1.2 million and the final equity distribution settlement of $0.7 million resulted in a loss of approximately $0.5 million that is recorded in other income (expense) on the consolidated statement of operations.
	Prior to March 2014, the Company held a fifty-nine (59%) equity interest in Bayou Delta through which the Company offers pipe jointing and other services for the steel-coated pipe industry. The remaining forty-one percent (41%) was held by Bayou Coating. On March 31, 2014, the Company acquired this forty-one percent (41%) interest from Bayou Coating by exercising its existing option at a purchase price equal to $0.6 million. As a result, Bayou Delta is now a wholly owned subsidiary of the Company.
	In June 2013, the Company sold its fifty percent (50%) interest in Insituform-Germany to Aarsleff. Insituform-Germany, a company that was jointly owned by Aegion and Aarsleff, is active in the business of no-dig pipe rehabilitation in Germany, Slovakia and Hungary. The sale price was €14.0 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). In connection with the sale, Insituform-Germany also entered into a tube supply agreement with the Company whereby Insituform-Germany will purchase on an annual basis at least GBP 2.3 million, approximately $3.6 million, of felt cured-in-place pipe (“CIPP”) liners during the two-year period from June 26, 2013 to June 30, 2015.
	The Company, through its subsidiary, Insituform Technologies Netherlands BV, owns a forty-nine percent (49%) equity interest in WCU Corrosion Technologies Pte. Ltd. (“WCU”). WCU offers the Company’s Tite Liner® process in the oil and gas sector and onshore corrosion services in Asia and Australia.
	Investments in entities in which the Company does not have control or is not the primary beneficiary of a variable interest entity, and for which the Company has 20% to 50% ownership or has the ability to exert significant influence, are accounted for by the equity method. At December 31, 2013, the investment in affiliated companies on the Company’s consolidated balance sheets was $9.1 million. Due to the sale of Bayou Coating, the balance was zero at June 30, 2014.
	Net income presented below for the quarters ended June 30, 2014 and 2013 includes Bayou Coating’s previously held forty-one percent (41%) interest in Bayou Delta, which is eliminated for purposes of determining the Company’s equity in earnings of affiliated companies because Bayou Delta is consolidated in the Company’s financial statements as a result of its additional ownership through another Company subsidiary.
	The Company’s equity in earnings of affiliated companies for all periods presented below includes acquisition-related depreciation and amortization expense and is net of income taxes associated with these earnings. Financial data for these investments in affiliated companies for each of the six month periods ended June 30, 2014 and 2013 is summarized in the following table (in thousands):
		Six Months Ended June 30,
	Income statement data	2014		2013 (1)
	Revenue	$	9,088	$	60,845
	Gross profit	3,489		14,699
	Net income	2,413		7,784
	Equity in earnings of affiliated companies	677		2,212
	_____________________
	(1)    Includes the financial data of Insituform-Germany.
Investments in Variable Interest Entities	'
	Investments in Variable Interest Entities
	The Company evaluates all transactions and relationships with variable interest entities (“VIE”) to determine whether the Company is the primary beneficiary of the entities in accordance with FASB ASC 810, Consolidation.
	The Company’s overall methodology for evaluating transactions and relationships under the VIE requirements includes the following two steps:
	•	determine whether the entity meets the criteria to qualify as a VIE; and
	•	determine whether the Company is the primary beneficiary of the VIE.
	In performing the first step, the significant factors and judgments that the Company considers in making the determination as to whether an entity is a VIE include:
	•	the design of the entity, including the nature of its risks and the purpose for which the entity was created, to determine the variability that the entity was designed to create and distribute to its interest holders;
	•	the nature of the Company’s involvement with the entity;
	•	whether control of the entity may be achieved through arrangements that do not involve voting equity;
	•	whether there is sufficient equity investment at risk to finance the activities of the entity; and
	•	whether parties other than the equity holders have the obligation to absorb expected losses or the right to receive residual returns.
	If the Company identifies a VIE based on the above considerations, it then performs the second step and evaluates whether it is the primary beneficiary of the VIE by considering the following significant factors and judgments:
	•	whether the entity has the power to direct the activities of a variable interest entity that most significantly impact the entity’s economic performance; and
	•	whether the entity has the obligation to absorb losses of the entity that could potentially be significant to the variable interest entity or the right to receive benefits from the entity that could potentially be significant to the variable interest entity.
Newly Issued Accounting Pronouncements	'
	Newly Issued Accounting Pronouncements
	In April 2014, the FASB issued guidance that changes the criteria for determining which disposals can be presented as discontinued operations and modifies the related disclosure requirements. Under the new guidance, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results and is disposed of or classified as held for sale. The standard also introduces several new disclosures. The guidance applies prospectively to new disposals and new classifications of disposal groups as held for sale after the effective date and is effective for annual and interim periods beginning after December 15, 2014, with earlier adoption permitted. The Company does not expect that the adoption of this standard will have a material effect on its financial statements.
	In May 2014, the FASB issued guidance that supersedes revenue recognition requirements regarding contracts with customers to transfer goods or services or for the transfer of nonfinancial assets. Under the new guidance, entities are required to recognize revenue in order to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides a five-step analysis to be performed on transactions to determine when and how revenue is recognized. This new guidance is effective retroactively in fiscal years beginning after December 15, 2016. The Company is currently evaluating the effect the guidance will have on its financial condition and results of operations.

Note_1_General_Tables

Note 1 - General (Tables)	6 Months Ended
	Jun. 30, 2014
General [Line Items]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following table summarizes the fair value of identified assets and liabilities of the Brinderson acquisition at its acquisition date (in thousands):
	Cash	$	3,842
	Receivables and cost and estimated earnings in excess of billings	28,353
	Prepaid expenses and other current assets	655
	Property, plant and equipment	6,848
	Identified intangible assets	60,210
	Other assets	1,071
	Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	(30,622		)
	Total identifiable net assets	$	70,357
	Total consideration recorded	$	147,605
	Less: total identifiable net assets	70,357
	Goodwill at June 30, 2014	$	77,248
Pro Forma [Member]	'
General [Line Items]	'
Business Acquisition, Pro Forma Information	'
	The following unaudited pro forma summary presents combined information of the Company as if the Brinderson acquisition had occurred at the beginning of the year preceding its acquisition (in thousands):
		Quarter Ended			Six Months Ended
		30-Jun-13			30-Jun-13
	Revenues	$	291,981		$	578,177
	Net income (1)	13,705			21,987
	_____________________
	(1)	Includes pro-forma adjustments for purchase price depreciation and amortization as if those intangibles were recorded at the beginning of the year preceding the acquisition date.
Since Acquisition [Member]	'
General [Line Items]	'
Business Acquisition, Pro Forma Information	'
	The Brinderson acquisition made the following contributions to the Company’s revenues and profits (in thousands):
		Quarter Ended			Six Months Ended
		30-Jun-14			30-Jun-14
	Revenues	$	72,685		$	148,587
	Net income	1,915			4,927

Note_2_Accounting_Policies_Tab

Note 2 - Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2014
Balance Sheet [Member]	'
Note 2 - Accounting Policies [Line Items]	'
Schedule of Variable Interest Entities [Table Text Block]	'
	Financial data for consolidated variable interest entities are summarized in the following table (in thousands):
	Balance sheet data	June 30,			December 31,
		2014			2013
	Current assets	$	52,563		$	55,960
	Non-current assets	46,203			47,606
	Current liabilities	23,964			27,335
	Non-current liabilities	34,761			36,761
Income Statement [Member]	'
Note 2 - Accounting Policies [Line Items]	'
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]	'
	Financial data for these investments in affiliated companies for each of the six month periods ended June 30, 2014 and 2013 is summarized in the following table (in thousands):
		Six Months Ended June 30,
	Income statement data	2014			2013 (1)
	Revenue	$	9,088		$	60,845
	Gross profit	3,489			14,699
	Net income	2,413			7,784
	Equity in earnings of affiliated companies	677			2,212
	_____________________
	(1)    Includes the financial data of Insituform-Germany.
Schedule of Variable Interest Entities [Table Text Block]	'
		Six Months Ended June 30,
	Income statement data	2014			2013
	Revenue	$	35,482		$	38,429
	Gross profit	4,475			6,645
	Net income	(341		)	467

Note_3_Share_Information_Table

Note 3 - Share Information (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Schedule of Weighted Average Number of Shares	'
	Earnings per share have been calculated using the following share information:
		Quarters Ended June 30,		Six Months Ended June 30,
		2014	2013	2014	2013
	Weighted average number of common shares used for basic EPS	37,893,170	38,960,439	37,928,548	38,919,551
	Effect of dilutive stock options and restricted and deferred stock unit awards	357,028	358,390	378,099	391,838
	Weighted average number of common shares and dilutive potential common stock used in dilutive EPS	38,250,198	39,318,829	38,306,647	39,311,389

Note_4_Goodwill_and_Intangible1

Note 4 - Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill	'
	Goodwill
	(In millions)
		Energy and				Water and				Commercial				Total
		Mining				Wastewater				and Structural
	Beginning balance at January 1, 2014	$	153.1			$	130.1			$	65.5			$	348.7
	Additions to goodwill through acquisitions (1)	—				—				1.1				1.1
	Foreign currency translation	(0.1		)		0.2				0.1				0.1
	Balance at June 30, 2014 (2)	$	153			$	130.3			$	66.7			$	349.9
	__________________________
	(1)	During the second quarter of 2014, the Company recorded goodwill of $1.1 million related to the 2012 acquisition of Fyfe Asia (see Note 1).
	(2)	The Company does not have any accumulated impairment charges.
Schedule of Finite-Lived Intangible Assets	'
	Identified Intangible Assets
	(In thousands)			30-Jun-14												31-Dec-13
		Weighted Average Useful Lives (Years)		Gross Carrying Amount				Accumulated Amortization				Net Carrying Amount				Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	License agreements	6		$	3,917			$	(3,058	)		$	859			$	3,917	$	(2,977	)	$	940
	Backlog	0		4,744				(4,744		)		—				4,745		(4,745		)	—
	Leases	13		2,067				(551		)		1,516				2,067		(477		)	1,590
	Trademarks	16		21,521				(4,682		)		16,839				21,394		(4,167		)	17,227
	Non-competes	4		1,140				(796		)		344				1,140		(753		)	387
	Customer relationships	14		182,832				(33,729		)		149,103				182,703		(28,287		)	154,416
	Patents and acquired technology	17		59,022				(23,925		)		35,097				57,419		(22,696		)	34,723
				$	275,243			$	(71,485	)		$	203,758			$	273,385	$	(64,102	)	$	209,283
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	'
	Estimated amortization expense by year is as follows (in thousands):
	2014		$	14,364
	2015		14,652
	2016		14,651
	2017		14,612
	2018		14,534

Note_6_Stockholders_Equity_and1

Note 6 - Stockholders' Equity and Equity Compensation (Tables)	6 Months Ended
	Jun. 30, 2014
Shareholders' Equity and Share-based Payments [Abstract]	'
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	'
	The following table summarizes all stock award activity during the six months ended June 30, 2014:
		Stock Awards			Weighted
					Average
					Award Date
					Fair Value
	Outstanding at January 1, 2014	555,025			$	22.79
	Restricted shares awarded	222,944			24.19
	Restricted stock units awarded	230,324			24.21
	Restricted shares distributed	(115,676	)		23.66
	Restricted stock units distributed	(15,277	)		21.25
	Restricted shares forfeited	(59,632	)		23.44
	Restricted stock units forfeited	(96,976	)		24.66
	Outstanding at June 30, 2014	720,732			$	23.26
Schedule of Other Share-based Compensation, Activity	'
	The following table summaries all deferred stock unit activity during the six months ended June 30, 2014:
		Deferred			Weighted
		Stock			Average
		Units			Award Date
					Fair Value
	Outstanding at January 1, 2014	214,455			$	19.56
	Awarded	32,904			23.96
	Distributed	(30,594	)		19.62
	Outstanding at June 30, 2014	216,765			$	20.19
Schedule of Share-based Compensation, Stock Options, Activity	'
	The following table summarizes all stock option activity during the six months ended June 30, 2014:
		Shares			Weighted
					Average
					Exercise
					Price
	Outstanding at January 1, 2014	1,208,824			$	18.54
	Granted	38,820			24.21
	Exercised	(322,173	)		14.15
	Canceled/Expired	(110,798	)		23.03
	Outstanding at June 30, 2014	814,673			$	19.93
	Exercisable at June 30, 2014	743,540			$	20.06
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity	'
	Financial data for stock option exercises are summarized in the following table (in thousands):
		Six Months Ended June 30,
		2014				2013
	Amount collected from stock option exercises	$	7,645			$	738
	Total intrinsic value of stock option exercises	3,088				131
	Tax benefit (expense) of stock option exercises recorded in additional paid-in-capital	(459		)		55
	Aggregate intrinsic value of outstanding stock options	3,452				5,877
	Aggregate intrinsic value of exercisable stock options	3,113				5,062
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	'
		Six Months Ended June 30,
		2014		2013
	Grant-date fair value	$11.27		$12.92
	Volatility	41.60%		49.80%
	Expected term (years)	7		7
	Dividend yield	—%		—%
	Risk-free rate	2.30%		1.10%

Note_8_Segment_Reporting_Table

Note 8 - Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Schedule of Segment Reporting Information, by Segment	'
	Financial information by segment was as follows (in thousands):
		Quarters Ended June 30,				Six Months Ended June 30,
		2014		2013		2014			2013
	Revenues:
	Energy and Mining	$	175,608	$	108,592	$	359,518		$	217,283
	Water and Wastewater	129,710		115,736		235,843			219,531
	Commercial and Structural	17,550		17,772		33,741			31,262
	Total revenues	$	322,868	$	242,100	$	629,102		$	468,076
	Gross profit:
	Energy and Mining	$	35,967	$	26,294	$	71,476		$	50,560
	Water and Wastewater	29,257		25,576		49,359			44,737
	Commercial and Structural	6,694		6,698		12,146			11,408
	Total gross profit	$	71,918	$	58,568	$	132,981		$	106,705
	Operating income (loss):
	Energy and Mining	$	7,743	$	6,156	$	15,418		$	11,607
	Water and Wastewater	12,654		9,040		15,674			11,602
	Commercial and Structural	222		627		(1,339		)	(568		)
	Total operating income	$	20,619	$	15,823	$	29,753		$	22,641
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area	'
	The following table summarizes revenues, gross profit and operating income by geographic region (in thousands):
		Quarters Ended June 30,				Six Months Ended June 30,
		2014		2013		2014			2013
	Revenues(1):
	United States	$	227,618	$	155,444	$	438,248		$	294,191
	Canada	42,212		35,752		84,075			75,146
	Europe	21,175		22,337		43,791			44,987
	Other foreign	31,863		28,567		62,988			53,752
	Total revenues	$	322,868	$	242,100	$	629,102		$	468,076
	Gross profit:
	United States	$	50,891	$	38,055	$	92,284		$	67,168
	Canada	9,934		8,100		18,996			17,402
	Europe	4,543		5,680		9,301			10,684
	Other foreign	6,550		6,733		12,400			11,451
	Total gross profit	$	71,918	$	58,568	$	132,981		$	106,705
	Operating income:
	United States	$	11,693	$	7,231	$	14,089		$	7,126
	Canada	6,129		4,477		11,552			10,225
	Europe	851		1,955		1,378			2,823
	Other foreign	1,946		2,160		2,734			2,467
	Total operating income	$	20,619	$	15,823	$	29,753		$	22,641
	__________________________
	(1)	Revenues are attributed to the country of origin for the Company’s legal entities. For a significant majority of its legal entities, the country of origin relates to the country or geographic area that it services.

Note_9_Discontinued_Operations1

Note 9 - Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2014
Income Statement [Member]	'
Note 9 - Discontinued Operations (Tables) [Line Items]	'
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	'
	Operating results for discontinued operations are summarized as follows (in thousands):
		Quarters Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
	Revenues	$	—		$	2,444		$	—		$	8,120
	Gross loss	(46		)	(2,161		)	(67		)	(3,240		)
	Operating expenses	200			1,159			402			1,618
	Closure charges of welding business	—			5,019			—			5,019
	Operating loss	(246		)	(8,339		)	(469		)	(9,877		)
	Other income (expense)	(73		)	211			(73		)	182
	Loss before income tax	(319		)	(8,128		)	(542		)	(9,695		)
	Tax (expense) benefit	(45		)	3,151			46			3,797
	Net loss	(364		)	(4,977		)	(496		)	(5,898		)
Balance Sheet [Member]	'
Note 9 - Discontinued Operations (Tables) [Line Items]	'
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	'
	Balance sheet data for discontinued operations was as follows (in thousands):
		June 30,			December 31,
		2014			2013
	Restricted cash	$	1,193		$	1,193
	Receivables, net	3,484			4,038
	Prepaid expenses and other current assets	222			204
	Property, plant and equipment, less accumulated depreciation	955			1,118
	Deferred tax assets	1,596			1,803
	Total assets	$	7,450		$	8,356
	Accounts payable	$	1,566		$	2,050
	Accrued expenses	216			20
	Deferred tax liabilities	238			197
	Total liabilities	$	2,020		$	2,267

Note_10_Derivative_Financial_I1

Note 10 - Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	'
	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		June 30,				December 31,
					2014				2013
	Derivatives Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	385			$	24
			Total Assets		$	385			$	24
	Interest Rate Swaps		Other non-current liabilities		$	1,229			$	1,220
			Total Liabilities		$	1,229			$	1,220
	Derivatives Not Designated as Hedging Instruments:
	Forward Currency Contracts		Prepaid expenses and other current assets		$	265			$	878
			Total Assets		$	265			$	878
			Total Derivative Assets		$	650			$	902
			Total Derivative Liabilities		1,229				1,220
			Total Net Derivative Liability		$	579			$	318
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	'
	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
		30-Jun-14				(Level 1)				(Level 2)		(Level 3)
	Assets:
	Forward Currency Contracts	$	650			$	—			$	650	$	—
	Total	$	650			$	—			$	650	$	—
	Liabilities:
	Interest Rate Swap	$	1,229			$	—			$	1,229	$	—
	Total	$	1,229			$	—			$	1,229	$	—
		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	$	902			$	—			$	902	$	—
	Total	$	902			$	—			$	902	$	—
	Liabilities:
	Interest Rate Swap	$	1,220			$	—			$	1,220	$	—
	Total	$	1,220			$	—			$	1,220	$	—
Schedule of Notional Amounts of Outstanding Derivative Positions	'
	The following table summarizes the Company’s derivative positions at June 30, 2014:
		Position		Notional				Weighted		Average
				Amount				Average		Exchange
								Remaining		Rate
								Maturity
								In Years
	Canadian Dollar/USD	Sell		$	37,151,612			0.4		1.07
	Singapore Dollar/USD	Sell		$	1,973,834			0.5		1.25
	Hong Kong Dollar/USD	Sell		$	1,558,146			0.5		7.75
	Australian Dollar/USD	Sell		$	3,030,088			0.5		0.93
	USD/British Pound	Sell		£	1,900,000			0.2		1.71
	EURO/British Pound	Sell		£	8,000,000			0.5		0.8
	Interest Rate Swap			$	166,250,000			2.1

Note_1_General_Details

Note 1 - General (Details)

3 Months Ended

6 Months Ended

12 Months Ended

24 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2015

Jun. 30, 2015

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jul. 02, 2013

Jun. 30, 2014

Jun. 30, 2013

Mar. 31, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jul. 02, 2013

Jun. 30, 2013

USD ($)

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

USD ($)

GBP (£)

Goodwill and Intagible Assets [Member]

Tangible Assets [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Delta Double Jointing [Member]

Brinderson LP [Member]

2013 Credit Facility [Member]

Insituform Germany [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

General [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill, Acquired During Period

'

'

'

$1,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

150,000,000

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling Interest, Ownership Percentage by Parent

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

59.00%

'

'

50.00%

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

'

'

'

'

'

'

'

'

'

'

'

'

'

51.00%

'

'

'

41.00%

'

'

'

Sale of interests in German joint venture

'

'

'

9,065,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Noncontrolling Interests

'

'

'

617,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

PercentOfBookValue

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

49.00%

49.00%

'

'

'

'

Gain (Loss) on Sale of Equity Investments

'

'

'

-472,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity Method Investment, Other than Temporary Impairment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,700,000

'

'

'

'

'

'

Equity Method Investment Other Than Temporary Impairment Net Of Tax

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,800,000

'

'

'

'

'

'

Total consideration recorded

'

18,300,000

14,000,000

0

-18,300,000

'

'

'

'

'

147,600,000

147,605,000

'

'

'

'

'

'

'

'

'

Gain (Loss) on Disposition of Business

'

11,300,000

'

0

11,771,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Transaction Costs

'

500,000

'

'

500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Purchase Commitment, Amount (in Pounds)

'

'

'

'

'

'

3,600,000

2,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity in earnings of affiliated companies

0

1,310,000

'

677,000

2,212,000

'

'

'

'

'

'

'

'

1,200,000

'

'

'

'

'

'

'

Proceeds from Equity Method Investment, Dividends or Distributions

'

'

'

684,000

2,269,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss Contingency Accrual

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$14,500,000

'

'

Note_1_General_Details_Busines

Note 1 - General (Details) - Business Acquisitions - Contributions to Revenues and Profits Since Acquisitions (Brinderson LP [Member], USD $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2014
Brinderson LP [Member]	'	'
Note 1 - General - Business Acquisitions - Contributions to Revenues and Profits Since Acquisitions [Line Items]	'	'
Revenues	$72,685	$148,587
Net income	$1,915	$4,927

Note_1_General_Details_Busines1

Note 1 - General (Details) - Business Acquisitions - Pro Forma Information (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Jun. 30, 2013
Business Acquisitions - Proforma Information [Abstract]	'	'	'
Revenues	'	$291,981	$578,177
Net income (loss)	'	$13,705	$21,987

Note_1_General_Details_Busines2

Note 1 - General (Details) - Business Acquisitions - Initial Purchase Price Allocation	3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2014
	USD ($)	EUR (€)	USD ($)	USD ($)	USD ($)	Brinderson LP [Member]	Brinderson LP [Member]
						USD ($)	USD ($)
Note 1 - General - Business Acquisitions - Initial Purchase Price Allocation [Line Items]	'	'	'	'	'	'	'
Cash	'	'	'	'	'	'	$3,842
Receivables and cost and estimated earnings in excess of billings	'	'	'	'	'	'	28,353
Prepaid expenses and other current assets	'	'	'	'	'	'	655
Property, plant and equipment	'	'	'	'	'	'	6,848
Identified intangible assets	'	'	'	'	'	'	60,210
Other assets	'	'	'	'	'	'	1,071
Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	'	'	'	'	'	'	-30,622
Total consideration recorded	18,300	14,000	0	-18,300	'	147,600	147,605
Total identifiable net assets	'	'	'	'	'	'	70,357
Goodwill at March 31, 2014	'	'	$349,912	'	$348,680	'	$77,248

Note_2_Accounting_Policies_Det

Note 2 - Accounting Policies (Details)

3 Months Ended

6 Months Ended

24 Months Ended

3 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2015

Jun. 30, 2015

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Mar. 31, 2014

Dec. 31, 2013

USD ($)

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

GBP (£)

USD ($)

Minimum [Member]

Maximum [Member]

Insituform Germany [Member]

WCU [Member]

Delta Double Jointing [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Bayou Coating [Member]

Bayou Coating [Member]

USD ($)

USD ($)

Note 2 - Accounting Policies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

PercentOfBookValue

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

49.00%

49.00%

Sale of interests in German joint venture

'

'

'

$9,065,000

$0

'

'

'

'

'

'

'

'

'

'

'

'

Equity Method Investment, Other than Temporary Impairment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,700,000

'

'

Equity Method Investment Other Than Temporary Impairment Net Of Tax

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,800,000

'

'

Equity Method Investment, Summarized Financial Information, Net Income (Loss)

0

1,310,000

'

677,000

2,212,000

'

'

'

'

'

'

'

'

1,200,000

'

'

'

Proceeds from Equity Method Investment, Dividends or Distributions

'

'

'

684,000

2,269,000

'

'

'

'

'

'

'

'

'

'

'

'

Gain (Loss) on Sale of Equity Investments

'

'

'

-472,000

0

'

'

'

'

'

'

'

'

'

'

'

'

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

2,500,000

6,000,000

'

2,500,000

6,000,000

'

'

'

'

'

'

'

'

'

'

'

'

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

-800,000

-500,000

'

-800,000

-500,000

'

'

'

'

'

'

'

'

'

'

'

'

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

-200,000

-200,000

'

-200,000

-200,000

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling Interest, Ownership Percentage by Parent

'

'

'

'

'

'

'

'

'

'

50.00%

'

59.00%

'

'

'

'

Total consideration recorded

'

18,300,000

14,000,000

0

-18,300,000

'

'

'

'

'

'

'

'

'

'

'

'

Gain (Loss) on Disposition of Business

'

11,300,000

'

0

11,771,000

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Transaction Costs

'

500,000

'

'

500,000

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Purchase Commitment, Amount (in Pounds)

'

'

'

'

'

3,600,000

2,300,000

'

'

'

'

'

'

'

'

'

'

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

'

'

'

'

'

'

'

'

'

'

'

49.00%

41.00%

51.00%

'

'

'

Payments to Noncontrolling Interests

'

'

'

617,000

0

'

'

'

'

'

'

'

'

'

'

'

'

Equity Method Investment, Ownership Percentage

'

'

'

'

'

'

'

'

20.00%

50.00%

'

'

'

'

'

'

'

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

$0

'

'

$0

'

'

'

$9,101,000

'

'

'

'

'

'

'

'

'

Note_2_Accounting_Policies_Det1

Note 2 - Accounting Policies (Details) - Financial Data for Investments in Affiliated Companies (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financial Data for Investments in Affiliated Companies [Abstract]	'	'	'	'
Revenue	'	'	$9,088	$60,845
Gross profit	'	'	3,489	14,699
Net income	'	'	2,413	7,784
Equity in earnings of affiliated companies	$0	$1,310	$677	$2,212

Note_2_Accounting_Policies_Det2

Note 2 - Accounting Policies (Details) - Financial Data for Variable Interest Entities - Balance Sheet (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial Data for Variable Interest Entities - Balance Sheet [Abstract]	'	'
Current assets	$52,563	$55,960
Non-current assets	46,203	47,606
Current liabilities	23,964	27,335
Non-current liabilities	$34,761	$36,761

Note_2_Accounting_Policies_Det3

Note 2 - Accounting Policies (Details) - Financial Data for Variable Interest Entities - Income Statement (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Financial Data for Variable Interest Entities - Income Statement [Abstract]	'	'
Revenue	$35,482	$38,429
Gross profit	4,475	6,645
Net income	($341)	$467

Note_3_Share_Information_Detai

Note 3 - Share Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	200,725	324,605	200,725	159,639

Note_3_Share_Information_Detai1

Note 3 - Share Information (Details) - Earnings Per Share Calculation, Share Information	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share Calculation, Share Information [Abstract]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	200,725	324,605	200,725	159,639
Weighted average number of common shares used for basic EPS	37,893,170	38,960,439	37,928,548	38,919,551
Effect of dilutive stock options and restricted and deferred stock unit awards	357,028	358,390	378,099	391,838
Weighted average number of common shares and dilutive potential common stock used in dilutive EPS	38,250,198	39,318,829	38,306,647	39,311,389

Note_4_Goodwill_and_Intangible2

Note 4 - Goodwill and Intangible Assets Note 4 - Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'	'
Amortization of Intangible Assets	$3.60	$2.60	$7	$5.10

Note_4_Goodwill_and_Intangible3

Note 4 - Goodwill and Intangible Assets (Details) - Reconciliation Goodwill (USD $)	6 Months Ended
	Jun. 30, 2014
Goodwill [Line Items]	'
Goodwill, Acquired During Period	$1,100,000
Goodwill [Roll Forward]	'
Goodwill	348,680,000
Foreign currency translation	98,000
Goodwill	349,912,000
Energy And Mining [Member]	'
Goodwill [Line Items]	'
Goodwill, Acquired During Period	0
Goodwill [Roll Forward]	'
Goodwill	153,110,000
Foreign currency translation	-149,000
Goodwill	152,961,000
Water and Wastewater [Member]	'
Goodwill [Line Items]	'
Goodwill, Acquired During Period	0
Goodwill [Roll Forward]	'
Goodwill	130,078,000
Foreign currency translation	182,000
Goodwill	130,260,000
Commercial And Structural [Member]	'
Goodwill [Line Items]	'
Goodwill, Acquired During Period	1,100,000
Goodwill [Roll Forward]	'
Goodwill	65,492,000
Foreign currency translation	65,000
Goodwill	$66,691,000

Note_4_Goodwill_and_Intangible4

Note 4 - Goodwill and Intangible Assets (Details) - Intangible Assets (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$275,243	$273,385
Accumulated Amortization	-71,485	-64,102
Net Carrying Amount	203,758	209,283
Licensing Agreements [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Useful Lives	'6 years	'
Gross Carrying Amount	3,917	3,917
Accumulated Amortization	-3,058	-2,977
Net Carrying Amount	859	940
Backlog [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Useful Lives	'0 years	'
Gross Carrying Amount	4,744	4,745
Accumulated Amortization	-4,744	-4,745
Net Carrying Amount	0	0
Leases [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Useful Lives	'13 years	'
Gross Carrying Amount	2,067	2,067
Accumulated Amortization	-551	-477
Net Carrying Amount	1,516	1,590
Trademarks [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Useful Lives	'16 years	'
Gross Carrying Amount	21,521	21,394
Accumulated Amortization	-4,682	-4,167
Net Carrying Amount	16,839	17,227
Non-competes [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Useful Lives	'4 years	'
Gross Carrying Amount	1,140	1,140
Accumulated Amortization	-796	-753
Net Carrying Amount	344	387
Customer Relationships [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Useful Lives	'14 years	'
Gross Carrying Amount	182,832	182,703
Accumulated Amortization	-33,729	-28,287
Net Carrying Amount	149,103	154,416
Patents and acquired technology [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Useful Lives	'17 years	'
Gross Carrying Amount	59,022	57,419
Accumulated Amortization	-23,925	-22,696
Net Carrying Amount	$35,097	$34,723

Note_4_Goodwill_and_Intangible5

Note 4 - Goodwill and Intangible Assets (Details) - Estimated Future Amortization Expense by Year (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Estimated Future Amortization Expense by Year [Abstract]	'
2014	$14,364
2016	14,652
2017	14,651
2017	14,612
2018	$14,534

Note_5_LongTerm_Debt_and_Credi1

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

3 Months Ended

6 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jul. 02, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jul. 31, 2013

Jul. 02, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jul. 02, 2013

Jul. 31, 2013

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

USD ($)

Wasco Energy [Member]

Wasco Energy [Member]

Bayou Wasco [Member]

Initial [Member]

Initial [Member]

Additional [Member]

Additional [Member]

Insurance Carriers Collateral [Member]

Work Performance Obligations [Member]

Bayou Wasco [Member]

BPPC [Member]

BPPC [Member]

2013 Credit Facility [Member]

2013 Credit Facility [Member]

2013 Credit Facility [Member]

2013 Credit Facility [Member]

2013 Credit Facility [Member]

2013 Credit Facility [Member]

Brinderson LP [Member]

Brinderson LP [Member]

Brinderson LP [Member]

2013 Interest Rate Swap [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Minimum [Member]

Maximum [Member]

USD ($)

USD ($)

USD ($)

USD ($)

Note 5 - Long-Term Debt and Credit Facility [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$650,000,000

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300,000,000

'

'

'

'

'

'

Secured Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

332,500,000

341,300,000

'

350,000,000

'

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.25%

2.25%

'

'

'

'

Debt Instrument, Interest Rate at Period End

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.00%

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Amount Outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

35,500,000

35,500,000

'

'

'

'

'

'

'

'

Total consideration recorded

18,300,000

14,000,000

0

-18,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

147,600,000

147,605,000

'

'

Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

150,000,000

'

Credit Facility, Retired Amount

'

'

'

'

'

232,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Consideration Paid

'

'

'

'

'

7,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other Loans Payable

'

'

100,000

'

100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Due from Joint Ventures

'

'

'

'

'

'

6,900,000

6,900,000

14,000,000

8,000,000

8,000,000

6,200,000

6,200,000

'

'

14,000,000

14,200,000

14,200,000

'

'

'

'

'

'

'

'

'

'

Other Long-term Debt

'

'

4,700,000

'

4,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of Credit Outstanding, Amount

'

'

21,500,000

'

'

'

'

'

'

'

'

'

'

12,100,000

9,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Fair Value

'

'

380,600,000

'

380,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Asset, Notional Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

175,000,000

Derivative, Variable Interest Rate

'

'

2.19%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Amount of Hedged Item

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

175,000,000

'

'

'

'

'

'

'

Derivative, Fixed Interest Rate Percentage

'

'

0.87%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility Maximum Consolidated Leverage Ratio

'

'

3.75

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CreditFacilityMinimumConsolidatedLeverageRatio

'

'

3.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility Actual Consolidated Leverage Ratio

'

'

2.97

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Remaining Borrowing Capacity

'

'

$68,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility Minimum Consolidated Fixed Charge Ratio

'

'

1.25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility Actual Consolidated Fixed Charge Ratio

'

'

1.34

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note_6_Stockholders_Equity_and2

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

1 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Feb. 28, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Through the Open Market Repurchase Program [Member]

In Connection with Equity Compensation Programs [Member]

In Connection with Equity Compensation Programs [Member]

Stock Awards [Member]

Stock Awards [Member]

Deferred Stock Units [Member]

Deferred Stock Units [Member]

Deferred Stock Units [Member]

Deferred Stock Units [Member]

Deferred Stock Units [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

2013 Employee Plan [Member]

2013 Employee Plan [Member]

2011 Director Plan [Member]

Deferred Compensation, Share-based Payments [Member]

Stock Awards [Member]

2011 Director Plan [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Repurchase Program, Authorized Amount

$20,000,000

'

'

'

'

'

'

$10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Repurchased During Period, Shares (in Shares)

'

'

'

'

'

591,923

290,917

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Repurchased During Period, Value

'

'

'

'

'

13,800,000

6,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

$23.36

$23.49

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,895,000

'

250,000

'

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

'

'

'

'

'

'

'

'

720,732

555,025

216,765

'

216,765

'

214,455

'

'

'

'

'

1,968,999

'

135,396

Allocated Share-based Compensation Expense

'

1,000,000

900,000

1,900,000

2,100,000

'

'

'

'

'

0

0

788,000

890,000

'

100,000

400,000

500,000

1,000,000

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized

'

$12,800,000

'

$12,800,000

'

'

'

'

'

'

'

'

'

'

'

$400,000

'

$400,000

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition

'

'

'

'2 years 3 months 11 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year 0 months 7 days

'

'

'

'

'

Price Per Share For Intrinsic Value Calculation Stock Options (in Dollars per share)

'

$23.27

$22.51

$23.27

$22.51

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note_6_Stockholders_Equity_and3

Note 6 - Stockholders' Equity and Equity Compensation (Details) - Summary of Stock Award Activity (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
	Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member]	Stock Awards [Member]	Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'	'	'	'
Stock Awards - Outstanding	'	'	720,732	555,025
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	'	'	$23.26	$22.79
Stock Awards - Awarded	222,944	230,324	'	'
Weighted Average Award Date Fair Value - Awarded (in Dollars per share)	$24.19	$24.21	'	'
Stock Awards - Distributed	-115,676	-15,277	'	'
Weighted Average Award Date Fair Value - Distributed (in Dollars per share)	$23.66	$21.25	'	'
Stock Awards - Forfeited	-59,632	-96,976	'	'
Weighted Average Award Date Fair Value - Forfeited (in Dollars per share)	$23.44	$24.66	'	'
Stock Awards - Outstanding	'	'	720,732	555,025
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	'	'	$23.26	$22.79

Note_6_Stockholders_Equity_and4

Note 6 - Stockholders' Equity and Equity Compensation (Details) - Summary of Deferred Stock Unit Activity (Deferred Stock Units [Member], USD $)	6 Months Ended
	Jun. 30, 2014
Deferred Stock Units [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'
Stock Awards - Outstanding	214,455
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	$19.56
Awarded	32,904
Awarded (in Dollars per share)	$23.96
Shares distributed	-30,594
Shares distributed (in Dollars per share)	$19.62
Stock Awards - Outstanding	216,765
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	$20.19

Note_6_Stockholders_Equity_and5

Note 6 - Stockholders' Equity and Equity Compensation (Details) - Summary of Stock Option Activity (USD $)	6 Months Ended
	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'
Outstanding at January 1, 2013	1,208,824
Outstanding at January 1, 2013 (in Dollars per share)	$18.54
Granted	38,820
Granted (in Dollars per share)	$24.21
Exercised	-322,173
Exercised (in Dollars per share)	$14.15
Canceled/Expired	-110,798
Canceled/Expired (in Dollars per share)	$23.03
Outstanding at September 30, 2013	814,673
Outstanding at September 30, 2013 (in Dollars per share)	$19.93
Exercisable at September 30, 2013	743,540
Exercisable at September 30, 2013 (in Dollars per share)	$20.06

Note_6_Stockholders_Equity_and6

Note 6 - Stockholders' Equity and Equity Compensation (Details) - Additional Stock Option Information (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Additional Stock Option Information [Abstract]	'	'
Amount collected from stock option exercises	$7,645	$738
Total intrinsic value of stock option exercises	3,088	131
Tax benefit of stock option exercises recorded in additional paid-in-capital	-459	55
Aggregate intrinsic value of outstanding stock options	3,452	5,877
Aggregate intrinsic value of exercisable stock options	$3,113	$5,062

Note_6_Stockholders_Equity_and7

Note 6 - Stockholders' Equity and Equity Compensation (Details) - Binomial Option-Pricing Model Assumptions (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Binomial Option-Pricing Model Assumptions [Abstract]	'	'
Grant-date fair value (in Dollars per share)	$11.27	$12.92
Volatility	41.60%	49.80%
Expected term (years)	'7 years	'7 years
Dividend yield	0.00%	0.00%
Risk-free rate	2.30%	1.10%

Note_7_Commitments_and_Conting1

Note 7 - Commitments and Contingencies Footnote Details (Details) (USD $)	Jun. 30, 2014
Loss Contingencies [Line Items]	'
Loss Contingency, Range of Possible Loss, Minimum	$0
Loss Contingency, Range of Possible Loss, Maximum	24,000,000
Brinderson LP [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency Accrual	$14,500,000

Note_8_Segment_Reporting_Detai

Note 8 - Segment Reporting (Details)	6 Months Ended
	Jun. 30, 2014
	segment
	market
Note 8 - Segment Reporting (Details) [Line Items]	'
Number of Markets	3
Number of Reportable Segments	3
Water and Wastewater [Member]	'
Note 8 - Segment Reporting (Details) [Line Items]	'
Number of Reportable Segments	2

Note_8_Segment_Reporting_Detai1

Note 8 - Segment Reporting (Details) - Financial Information by Segment (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:	'	'	'	'
Revenues	$322,868	$242,100	$629,102	$468,076
Gross profit:	'	'	'	'
Gross profit	71,918	58,568	132,981	106,705
Operating income (loss):	'	'	'	'
Operating income (loss)	20,619	15,823	29,753	22,641
Energy And Mining [Member]	'	'	'	'
Revenues:	'	'	'	'
Revenues	175,608	108,592	359,518	217,283
Gross profit:	'	'	'	'
Gross profit	35,967	26,294	71,476	50,560
Operating income (loss):	'	'	'	'
Operating income (loss)	7,743	6,156	15,418	11,607
Water and Wastewater [Member]	'	'	'	'
Revenues:	'	'	'	'
Revenues	129,710	115,736	235,843	219,531
Gross profit:	'	'	'	'
Gross profit	29,257	25,576	49,359	44,737
Operating income (loss):	'	'	'	'
Operating income (loss)	12,654	9,040	15,674	11,602
Commercial And Structural [Member]	'	'	'	'
Revenues:	'	'	'	'
Revenues	17,550	17,772	33,741	31,262
Gross profit:	'	'	'	'
Gross profit	6,694	6,698	12,146	11,408
Operating income (loss):	'	'	'	'
Operating income (loss)	$222	$627	($1,339)	($568)

Note_8_Segment_Reporting_Detai2

Note 8 - Segment Reporting (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:	'	'	'	'
Revenues	$322,868	$242,100	$629,102	$468,076
Gross Profit:	'	'	'	'
Gross profit	71,918	58,568	132,981	106,705
Operating income (loss)	'	'	'	'
Operating income (loss)	20,619	15,823	29,753	22,641
United States [Member]	'	'	'	'
Revenues:	'	'	'	'
Revenues	227,618	155,444	438,248	294,191
Gross Profit:	'	'	'	'
Gross profit	50,891	38,055	92,284	67,168
Operating income (loss)	'	'	'	'
Operating income (loss)	11,693	7,231	14,089	7,126
Canada [Member]	'	'	'	'
Revenues:	'	'	'	'
Revenues	42,212	35,752	84,075	75,146
Gross Profit:	'	'	'	'
Gross profit	9,934	8,100	18,996	17,402
Operating income (loss)	'	'	'	'
Operating income (loss)	6,129	4,477	11,552	10,225
Europe [Member]	'	'	'	'
Revenues:	'	'	'	'
Revenues	21,175	22,337	43,791	44,987
Gross Profit:	'	'	'	'
Gross profit	4,543	5,680	9,301	10,684
Operating income (loss)	'	'	'	'
Operating income (loss)	851	1,955	1,378	2,823
Other foreign [Member]	'	'	'	'
Revenues:	'	'	'	'
Revenues	31,863	28,567	62,988	53,752
Gross Profit:	'	'	'	'
Gross profit	6,550	6,733	12,400	11,451
Operating income (loss)	'	'	'	'
Operating income (loss)	$1,946	$2,160	$2,734	$2,467

Note_9_Discontinued_Operations2

Note 9 - Discontinued Operations (Details) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013
Note 9 - 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 9 - Discontinued Operations [Line Items]	'	'
Impairment Effect on Earnings Per Share, after Tax (in Dollars per share)	$0.06	'
Tangible Assets [Member]	'	'
Note 9 - Discontinued Operations [Line Items]	'	'
Impairment Effect on Earnings Per Share, after Tax (in Dollars per share)	$0.02	'

Note_9_Discontinued_Operations3

Note 9 - Discontinued Operations (Details) - Operating Results for Discontinued Operations (USD $)	6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
				Bayou Welding Works [Member]	Bayou Welding Works [Member]	Bayou Welding Works [Member]	Bayou Welding Works [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'	'	'
Revenues	'	'	'	$0	$2,444	$0	$8,120
Gross profit	'	'	'	-46	-2,161	-67	-3,240
Operating expenses	'	'	'	200	1,159	402	1,618
Closure charges of welding business	'	'	100	0	5,019	0	5,019
Operating loss	'	'	'	-246	-8,339	-469	-9,877
Other expenses	-73	182	'	-73	211	'	'
Loss before tax benefits	'	'	'	-319	-8,128	-542	-9,695
Tax benefits	'	'	'	-45	3,151	-46	-3,797
Net loss	'	'	'	($364)	($4,977)	($496)	($5,898)

Note_9_Discontinued_Operations4

Note 9 - Discontinued Operations (Details) - Balance Sheet Data for Discontinued Operations (Bayou Welding Works [Member], Discontinued Operations [Member], USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Bayou Welding Works [Member] | Discontinued Operations [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Restricted cash	$1,193	$1,193
Receivables, net	3,484	4,038
Prepaid expenses and other current assets	222	204
Property, plant and equipment, less accumulated depreciation	955	1,118
Deferred tax assets	1,596	1,803
Total assets	7,450	8,356
Accounts payable	1,566	2,050
Accrued expenses	216	20
Deferred tax liabilities	238	197
Total liabilities	$2,020	$2,267

Note_10_Derivative_Financial_I2

Note 10 - Derivative Financial Instruments (Details) (USD $)

3 Months Ended

6 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jul. 31, 2013

Jul. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jul. 31, 2013

Jul. 02, 2013

2011 Interest Rate Swap [Member]

2013 Interest Rate Swap [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

2013 Credit Facility [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

'

'

'

'

'

'

'

'

Cash Flow Hedge Derivative Instrument Assets at Fair Value

'

'

'

'

'

'

385,000

24,000

'

'

'

'

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

2,500,000

6,000,000

2,500,000

6,000,000

'

'

'

'

'

'

'

'

Derivative Asset, Notional Amount

'

'

'

'

83,000,000

175,000,000

'

'

'

'

'

'

Derivative, Amount of Hedged Item

'

'

'

'

'

'

'

'

'

'

175,000,000

'

Secured Debt

'

'

'

'

'

'

'

'

$332,500,000

$341,300,000

'

$350,000,000

Derivative, Fixed Interest Rate Percentage

0.87%

'

0.87%

'

'

'

'

'

'

'

'

'

Note_10_Derivative_Financial_I3

Note 10 - Derivative Financial Instruments (Details) - Summary of the Fair Value Amounts of Derivative Instruments (Fair Value, Inputs, Level 2 [Member], USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Inputs, Level 2 [Member]	'	'
Derivatives Designated as Hedging Instruments	'	'
Forward Currency Contracts	$385	$24
Cash Flow Hedge Derivative Instrument Assets at Fair Value	385	24
Interest Rate Swaps	1,229	1,220
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	1,229	1,220
Derivatives Not Designated as Hedging Instruments	'	'
Forward Currency Contracts	265	878
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	265	878
Derivative Assets (Liabilities), at Fair Value, Net	$579	$318

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 $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Inputs, Level 3 [Member]	'	'
Liabilities	'	'
Interest Rate Swap	$0	'
Total Derivative Liabilities	0	'
Fair Value, Measurements, Recurring [Member]	'	'
Assets	'	'
Forward Currency Contracts	650	902
Total Derivative Assets	650	902
Liabilities	'	'
Interest Rate Swap	1,229	1,220
Total Derivative Liabilities	1,229	1,220
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Assets	'	'
Forward Currency Contracts	0	0
Total Derivative Assets	0	0
Liabilities	'	'
Interest Rate Swap	0	0
Total Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Assets	'	'
Forward Currency Contracts	650	902
Total Derivative Assets	650	902
Liabilities	'	'
Interest Rate Swap	1,229	1,220
Total Derivative Liabilities	1,229	1,220
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'	'
Assets	'	'
Forward Currency Contracts	0	0
Total Derivative Assets	0	0
Liabilities	'	'
Interest Rate Swap	'	0
Total Derivative Liabilities	'	$0

Note_10_Derivative_Financial_I5

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

6 Months Ended

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Canadian Dollar/USD [Member]

Singapore Dollar/USD [Member]

Hong Kong Dollar/USD [Member]

Australian Dollar/USD [Member]

USD/British Pound [Member]

EURO/British Pound [Member]

Interest Rate Swap [Member]

Short [Member]

Short [Member]

Short [Member]

Short [Member]

Short [Member]

Short [Member]

Short [Member]

Canadian Dollar/USD [Member]

Singapore Dollar/USD [Member]

Hong Kong Dollar/USD [Member]

Australian Dollar/USD [Member]

USD/British Pound [Member]

EURO/British Pound [Member]

Interest Rate Swap [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

'

'

'

'

'

'

'

$37,151,612

$1,973,834

$1,558,146

$3,030,088

£ 1,900,000

£ 8,000,000

$166,250,000

Weighted Average Remaining Maturity In Years

'4 months 13 days

'5 months 20 days

'5 months 20 days

'5 months 20 days

'2 months 5 days

'5 months 15 days

'2 years 1 month 2 days

'

'

'

'

'

'

'

Average Exchange Rate

1.07

1.25

7.75

0.93

1.7103

0.8022

'

'

'

'

'

'

'

'