Aegion 10-Q 30 Oct 20 2020 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 23, 2020
Document Information [Line Items]
Entity Central Index Key	0000353020
Entity Registrant Name	Aegion Corp
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-35328
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-3117900
Entity Address, Address Line One	17988 Edison Avenue
Entity Address, City or Town	Chesterfield
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63005-1195
City Area Code	636
Local Phone Number	530-8000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Class A Common Shares, $0.01 par value
Trading Symbol	AEGN
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		30,772,852

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Revenues	[1]	$ 275,884	$ 308,789	$ 808,276		$ 904,433
Cost of revenues		215,624	241,997	644,557		721,909
Gross profit	[1]	60,260	66,792	163,719		182,524
Operating expenses		45,055	48,866	133,373		147,990
Goodwill impairment		39,430	0	40,688	[2],[3]	0
Definite-lived intangible asset impairment		0	0	957		0
Impairment (gain) of assets held for sale		0	0	(658)		11,946
Acquisition and divestiture expenses		680	1,842	2,189		2,759
Restructuring and related charges		2,335	1,435	4,287		5,495
Operating income (loss)		(27,240)	14,649	(17,117)		14,334
Other income (expense):
Interest expense		(4,288)	(3,446)	(12,174)		(10,602)
Interest income		258	268	701		814
Other	[4]	245	(5,236)	1,634		(6,925)
Total other expense		(3,785)	(8,414)	(9,839)		(16,713)
Income (loss) before taxes (benefit)		(31,025)	6,235	(26,956)		(2,379)
Taxes (benefit) on income (loss)		(3,131)	(114)	(1,755)		3,410
Net income (loss)		(27,894)	6,349	(25,201)		(5,789)
Non-controlling interests income		(580)	(313)	(1,049)		(542)
Net income (loss) attributable to Aegion Corporation		$ (28,474)	$ 6,036	$ (26,250)		$ (6,331)
Income (loss) per share attributable to Aegion Corporation:
Basic (in dollars per share)		$ (0.93)	$ 0.20	$ (0.85)		$ (0.20)
Diluted (in dollars per share)		$ (0.93)	$ 0.19	$ (0.85)		$ (0.20)
[1]	Revenues and gross profit are attributed to the country of origin
[2]	During the second quarter of 2020, the Company recorded a $1.3 million goodwill impairment related to restructuring activities within Energy Services (see Note 4).
[3]	During the third quarter of 2020, the Company recorded a $39.4 million goodwill impairment within Energy Services (see Note 2).
[4]	Other income in the third quarter of 2020 includes gains of $1.5 million related to restructuring (see Note 4) and a $0.6 million loss on the sale of Insituform Australia (see Note 1). Other expense in the third quarter of 2019 includes $5.3 million of restructuring charges (see Note 4). Other income (expense) in the first nine months of 2020 and 2019 includes gains of $1.8 million and charges of $6.5 million, respectively, related to restructuring (see Note 4). Other income in the first nine months of 2020 also includes gains of $0.1 million related to divestitures of Insituform Australia and Insituform Spain (see Note 1).

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income (loss)		$ (27,894)	$ 6,349	$ (25,201)	$ (5,789)
Other comprehensive income (loss):
Currency translation adjustments		1,905	439	660	3,505
Deferred gain (loss) on hedging activity, net of tax (1)	[1]	618	(1,180)	(5,556)	(6,879)
Pension activity, net of tax (2)	[2]	(39)	28	22	31
Total comprehensive income (loss)		(25,410)	5,636	(30,075)	(9,132)
Comprehensive income attributable to non-controlling interests		(528)	(286)	(907)	(535)
Comprehensive income (loss) attributable to Aegion Corporation		$ (25,938)	$ 5,350	$ (30,982)	$ (9,667)
[1]	Amounts presented net of tax of $0 and $30 for the quarters ended September 30, 2020 and 2019, respectively, and $0 and $180 for the nine months ended September 30, 2020 and 2019, respectively.
[2]	Amounts presented net of tax of $(9) and $6 for the quarters ended September 30, 2020 and 2019, respectively, and $5 and $7 for the nine months ended September 30, 2020 and 2019, respectively.

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020		Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 75,758		$ 64,874
Restricted cash	986		1,348
Receivables, net of allowances of $4,629 and $7,224, respectively	178,249		192,604
Retainage	30,970		33,103
Contract assets	51,150	[1]	51,092	[2]
Inventories	47,637		57,193
Prepaid expenses and other current assets	39,147		33,909
Assets held for sale	11,083		16,092
Total current assets	434,980		450,215
Property, plant & equipment, less accumulated depreciation	98,361		101,091
Other assets
Goodwill	216,340		256,835
Intangible assets, less accumulated amortization	93,945		104,828
Operating lease assets	67,504	[3]	71,466	[4]
Deferred income tax assets	445		1,216
Other non-current assets	8,955		9,862
Total other assets	387,189		444,207
Total Assets	920,530		995,513
Current liabilities
Accounts payable	66,226		60,614
Accrued expenses	93,141		96,577
Contract liabilities	37,034	[1]	37,562	[2]
Current maturities of long-term debt	23,825		32,803
Liabilities held for sale	1,864		6,485
Total current liabilities	222,090		234,041
Long-term debt, less current maturities	201,600		243,629
Other liabilities
Operating lease liabilities	52,418		56,253
Deferred income tax liabilities	9,453		11,254
Other non-current liabilities	27,274		15,243
Total other liabilities	89,145		82,750
Total liabilities	512,835		560,420
(See Commitments and Contingencies: Note 11)
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 30,770,323 and 30,715,959, respectively	308		307
Additional paid-in capital	103,977		101,148
Retained earnings	332,748		358,998
Accumulated other comprehensive loss	(37,426)		(32,694)
Total stockholders’ equity	399,607		427,759
Non-controlling interests	8,088		7,334
Total equity	407,695		435,093
Total Liabilities and Equity	$ 920,530		$ 995,513
[1]	Amounts exclude contract assets of $0.9 million and contract liabilities of less than $0.1 million that were classified as held for sale at September 30, 2020 (see Note 5).
[2]	Amounts exclude contract assets of $5.4 million and contract liabilities of $0.1 million that were classified as held for sale at December 31, 2019 (see Note 5).
[3]	Amounts exclude operating lease assets of $0.2 million, accrued expenses of less than $0.1 and other liabilities of less than $0.1 million that were classified as held for sale at September 30, 2020 (see Note 5).
[4]	Amounts exclude operating lease assets of $0.3 million, accrued expenses of $0.2 million and other liabilities of $0.2 million that were classified as held for sale at December 31, 2019 (see Note 5).

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts receivable	$ 4,629	$ 7,224
Preferred stock, undesignated, par value (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 value (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)	30,770,323	30,715,959
Common stock, shares outstanding (in shares)	30,770,323	30,715,959

Consolidated Statements of Equi

Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	Restricted Stock Units (RSUs) [Member]	Performance Shares [Member]	Common Stock [Member]	Common Stock [Member]Restricted Stock Units (RSUs) [Member]	Common Stock [Member]Performance Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Balance, beginning of period (in shares) at Dec. 31, 2018				31,922,409
Issuance of common stock upon stock option exercises (in shares)				52,783
Issuance of shares pursuant to restricted stock units (in shares)					222,745	111,158
Issuance of shares pursuant to deferred stock units (in shares)				84,184
Shares repurchased and retired (in shares)				(1,585,731)
Balance, end of period (in shares) at Sep. 30, 2019				30,807,548
Balance, beginning of period at Dec. 31, 2018	$ 470,187			$ 319			$ 122,818	$ 379,890	$ (40,290)	$ 7,450
Issuance of common stock upon stock option exercises	956			1			955
Issuance of shares pursuant to restricted stock units		$ 2	$ 1		$ 2	$ 1
Issuance of shares pursuant to deferred stock units	1			1
Shares repurchased and retired	(28,143)			(16)			(28,127)
Balance, end of period at Sep. 30, 2019	438,444			$ 308			101,627	373,559	(43,626)	6,576
Equity-based compensation expense	5,981						5,981
Net income (loss)	(5,789)							(6,331)		542
Currency translation adjustment, net	(3,343)								(3,336)	(7)
Distributions to non-controlling interests	(1,409)									(1,409)
Balance, beginning of period (in shares) at Jun. 30, 2019				30,941,394
Issuance of common stock upon stock option exercises (in shares)				0
Issuance of shares pursuant to restricted stock units (in shares)					17,471	0
Issuance of shares pursuant to deferred stock units (in shares)				6,698
Shares repurchased and retired (in shares)				(158,015)
Balance, end of period (in shares) at Sep. 30, 2019				30,807,548
Balance, beginning of period at Jun. 30, 2019	434,023			$ 309			102,841	367,523	(42,940)	6,290
Issuance of common stock upon stock option exercises	0			0			0
Issuance of shares pursuant to restricted stock units		0	0		$ 0	$ 0
Issuance of shares pursuant to deferred stock units	0			0
Shares repurchased and retired	(2,972)			(1)			(2,971)
Balance, end of period at Sep. 30, 2019	438,444			$ 308			101,627	373,559	(43,626)	6,576
Equity-based compensation expense	1,757						1,757
Net income (loss)	6,349							6,036		313
Currency translation adjustment, net	(713)								(686)	(27)
Distributions to non-controlling interests	$ 0									0
Balance, beginning of period (in shares) at Dec. 31, 2019	30,715,959			30,715,959
Issuance of common stock upon stock option exercises (in shares)				0
Issuance of shares pursuant to restricted stock units (in shares)					198,433	71,541
Issuance of shares pursuant to deferred stock units (in shares)				58,267
Shares repurchased and retired (in shares)				(273,877)
Balance, end of period (in shares) at Sep. 30, 2020	30,770,323			30,770,323
Balance, beginning of period at Dec. 31, 2019	$ 435,093			$ 307			101,148	358,998	(32,694)	7,334
Issuance of common stock upon stock option exercises	0			0			0
Issuance of shares pursuant to restricted stock units		2	1		$ 2	$ 1
Issuance of shares pursuant to deferred stock units	1			1
Shares repurchased and retired	(5,255)			(3)			(5,252)
Balance, end of period at Sep. 30, 2020	407,695			$ 308			103,977	332,748	(37,426)	8,088
Equity-based compensation expense	8,081						8,081
Net income (loss)	(25,201)							(26,250)		1,049
Currency translation adjustment, net	(4,874)								(4,732)	(142)
Distributions to non-controlling interests	$ (153)									(153)
Balance, beginning of period (in shares) at Jun. 30, 2020				30,768,399
Issuance of common stock upon stock option exercises (in shares)				0
Issuance of shares pursuant to restricted stock units (in shares)					9,888	0
Issuance of shares pursuant to deferred stock units (in shares)				1,685
Shares repurchased and retired (in shares)				(9,649)
Balance, end of period (in shares) at Sep. 30, 2020	30,770,323			30,770,323
Balance, beginning of period at Jun. 30, 2020	$ 429,618			$ 308			100,490	361,222	(39,962)	7,560
Issuance of common stock upon stock option exercises	0			0			0
Issuance of shares pursuant to restricted stock units		$ 0	$ 0		$ 0	$ 0
Issuance of shares pursuant to deferred stock units	0			0
Shares repurchased and retired	(151)			0			(151)
Balance, end of period at Sep. 30, 2020	407,695			$ 308			103,977	332,748	(37,426)	8,088
Equity-based compensation expense	3,638						$ 3,638
Net income (loss)	(27,894)							$ (28,474)		580
Currency translation adjustment, net	2,484								$ 2,536	(52)
Distributions to non-controlling interests	$ 0									$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (27,894)	$ 6,349	$ (25,201)		$ (5,789)
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization			26,853		26,530
Gain on sale of fixed assets			(568)		(527)
Equity-based compensation expense			8,081		5,981
Deferred income taxes			(1,670)		883
Non-cash restructuring charges			1,067		6,419
Goodwill impairment	39,430	0	40,688	[1],[2]	0
Definite-lived intangible asset impairment	0	0	957		0
Impairment of assets held for sale			0		11,946
Gain on sale of businesses			(109)		0
Loss on foreign currency transactions			420		370
Other			767		(39)
Changes in operating assets and liabilities (net of acquisitions):
Receivables net, retainage and contract assets			16,135		(1,488)
Inventories			6,283		(3,170)
Prepaid expenses and other assets			(4,953)		2,225
Accounts payable and accrued expenses			3,198		(8,476)
Contract liabilities			(381)		(1,435)
Other operating			7,812		(1,779)
Net cash provided by operating activities			79,379		31,651
Cash flows from investing activities:
Capital expenditures			(15,238)		(21,392)
Proceeds from sale of fixed assets			1,143		1,270
Patent expenditures			(264)		(292)
Sale of businesses, net of cash disposed			3,602		0
Net cash used in investing activities			(10,757)		(20,414)
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises			0		956
Repurchase of common stock			(5,251)		(28,143)
Distributions to non-controlling interests			(153)		(1,409)
Credit facility amendment fees			(1,995)		0
Payments on notes payable, net			0		(273)
Proceeds from (payments on) line of credit, net			(24,000)		8,000
Principal payments on long-term debt			(26,250)		(19,688)
Net cash used in financing activities			(57,649)		(40,557)
Effect of exchange rate changes on cash			(451)		(970)
Net increase (decrease) in cash, cash equivalents and restricted cash for the period			10,522		(30,290)
Cash, cash equivalents and restricted cash, beginning of year			66,222		84,886	$ 84,886
Cash, cash equivalents and restricted cash, end of period	$ 76,744	$ 54,596	$ 76,744		$ 54,596	$ 66,222
[1]	During the second quarter of 2020, the Company recorded a $1.3 million goodwill impairment related to restructuring activities within Energy Services (see Note 4).
[2]	During the third quarter of 2020, the Company recorded a $39.4 million goodwill impairment within Energy Services (see Note 2).

Note 1 - General

Note 1 - General	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. 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 statement of the Company’s financial position, results of operations and cash flows for the dates and periods presented. Results for interim periods are not The Consolidated Balance Sheet as of December 31, 2019 10 10 X not 10 2019 10 March 2, 2020. Strategic Initiatives/Acquisitions/Divestitures Restructuring Activities On July 28, 2017, 4. Infrastructure Solutions Segment (“Infrastructure Solutions”) On February 13, 2020, five ® five December 31, 2019 5. On January 24, 2020, five ® five December 31, 2019 5. During the second 2019, September 30, 2020 December 31, 2019. 19 5.

Note 2 - Accounting Policies

Note 2 - Accounting Policies	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Significant Accounting Policies [Text Block]	2. ACCOUNTING POLICIES Accumulated Other Comprehensive Loss As set forth below, the Company’s accumulated other comprehensive loss is comprised of three September 30, 2020 December 31, 2019 Currency translation adjustments (1) $ (26,439 ) $ (27,241 ) Derivative hedging activity (10,078 ) (4,522 ) Pension activity (909 ) (931 ) Total accumulated other comprehensive loss $ (37,426 ) $ (32,694 ) ( 1 During the nine September 30, 2020, 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 loss” in total stockholders’ equity. Net foreign exchange transaction losses of $0.7 million and gains of $0.1 million in the third 2020 2019 nine September 30, 2020 2019, Taxation The Company provides for estimated income taxes payable or refundable on current year income tax returns as well as the estimated future tax effects attributable to temporary differences and carryforwards, based upon enacted tax laws and tax rates, and in accordance with FASB ASC 740, Income Taxes 740” 740 not not may Earnings per Share Earnings per share have been calculated using the following share information: Quarter Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Weighted average number of common shares used for basic EPS 30,770,324 30,866,188 30,738,150 31,259,594 Effect of dilutive stock options and restricted and deferred stock unit awards — 511,244 — — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 30,770,324 31,377,432 30,738,150 31,259,594 The Company excluded 501,802 and 484,712 restricted and deferred stock units for the quarter and nine September 30, 2020, nine September 30, 2019 Cash, Cash Equivalents and Restricted Cash The Company classifies highly liquid investments with original maturities of 90 Cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets and Consolidated Statements of Cash Flows are as follows (in thousands): Balance sheet data September 30, 2020 December 31, 2019 Cash and cash equivalents $ 75,758 $ 64,874 Restricted cash 986 1,348 Cash, cash equivalents and restricted cash $ 76,744 $ 66,222 Restricted cash held in escrow primarily relates to funds reserved for legal requirements, deposits made in lieu of retention on specific projects performed for municipalities and state agencies, or advance customer payments and compensating balances for bank undertakings in Europe. Restricted cash related to operations is similar to retainage, and is, therefore, classified as a current asset, consistent with the Company’s policy on retainage. Fair Value Measurements FASB ASC 820, Fair Value Measurements 820” three • Level 1 • Level 2 • Level 3 no The Company uses these levels of hierarchy to measure the fair value of certain financial instruments on a recurring basis, such as for derivative instruments; on a non-recurring basis, such as for acquisitions and impairment testing; for disclosure purposes, such as for long-term debt; and for other applications, as discussed in their respective footnotes. Changes in assumptions or estimation methods could affect the fair value estimates. Other financial instruments including notes payable are recorded at cost, which approximates fair value, and is based on Level 2 no 1, 2 3 nine September 30, 2020 2019. Long-Lived Assets Property, plant and equipment and other identified intangibles (primarily customer relationships, patents and acquired technologies, trademarks, licenses and non-compete agreements) are recorded at cost, net of accumulated depreciation, amortization and impairment, and, except for goodwill, are depreciated or amortized on a straight-line basis over their estimated useful lives. Changes in circumstances such as technological advances, changes to the Company’s business model or changes in the Company’s capital strategy can result in the actual useful lives differing from the Company’s estimates. If the Company determines that the useful life of its property, plant and equipment or its identified intangible assets should be shortened, the Company would prospectively depreciate or amortize the net book value in excess of the salvage value over its revised remaining useful life, thereby increasing depreciation or amortization expense. Long-lived assets, including property, plant and equipment and other intangibles, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not may Impairment Review – Third Quarter 2020 The oil and gas industry experienced an unprecedented disruption during the first nine 2020 19 third 2020 2020 2021. 360, Property, Plant and Equipment 360” The assets of an asset group represent the lowest level for which identifiable cash flows can be determined independent of other groups of assets and liabilities. The Energy Services asset group was the only at-risk asset group reviewed for impairment. The Company developed internal forward business plans under the guidance of local and regional leadership to determine the undiscounted expected future cash flows derived from Energy Services’ long-lived assets. Such were based on management’s best estimates considering the likelihood of various outcomes. Based on the internal projections, the Company determined that the sum of the undiscounted expected future cash flows for the Energy Services asset group exceeded the carrying value of the assets and no The fair value estimates described above were determined using observable inputs and significant unobservable inputs, which are based on level 3 Goodwill Under FASB ASC 350, Goodwill and Other 350” may not not • significant underperformance of a segment relative to expected, historical or forecasted operating results; • significant negative industry or economic trends; • significant changes in the strategy for a segment including extended slowdowns in the segment’s market; • a decrease in market capitalization below the Company’s book value; and • a significant change in regulations. Whether during the annual impairment assessment or during a trigger-based impairment review, the Company estimates the fair value of its reporting units and compares such fair value to the carrying value of those reporting units to determine if there are any indications of goodwill impairment. Fair value of reporting units is estimated using a combination of two two The market approach estimates fair value by first The income approach is based on forecasted future (debt-free) cash flows that are discounted to present value using factors that consider timing and risk of future cash flows. The Company believes this approach is appropriate because it provides a fair value estimate based upon the reporting unit’s expected long-term operating cash flow performance. Discounted cash flow projections are based on financial forecasts developed from operating plans and economic outlooks, revenue growth rates, estimates of future expected changes in operating margins, terminal value growth rates, future capital expenditures and changes in working capital requirements. Estimates of discounted cash flows may The discount rate applied to the estimated future cash flows is one twenty may Impairment Review – Third Quarter 2020 Given the prolonged uncertainty in the oil and gas markets and the market assessment of the Energy Services reporting unit discussed above, the Company evaluated the goodwill of its Energy Services reporting unit during the third 2020 third 820 350, The values derived from both the income approach and the market approach decreased from the October 1, 2019 October 1, 2019 twenty October 1, 2019 2020 2021. 100 Based on the impairment analysis, the Company determined that recorded goodwill at the Energy Services reporting unit was impaired by $39.4 million, which was recorded to “Goodwill impairment” in the Consolidated Statement of Operations during the third 2020. September 30, 2020, 19 not The fair value estimates described above were determined using observable inputs and significant unobservable inputs, which are based on level 3 no five 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 no September 30, 2020 Financial data for consolidated variable interest entities are summarized in the following tables (in thousands): Balance sheet data September 30, 2020 December 31, 2019 Current assets $ 21,057 $ 18,304 Non-current assets 7,764 7,635 Current liabilities 9,721 8,261 Non-current liabilities 1,557 1,962 Quarter Ended September 30, Nine Months Ended September 30, Statement of operations data 2020 2019 2020 2019 Revenue $ 8,677 $ 7,275 $ 22,132 $ 20,719 Gross profit 3,354 2,412 7,735 6,463 Net income (loss) attributable to Aegion Corporation 534 (2,154 ) 889 (2,773 ) Newly Issued Accounting Pronouncements In March 2020, No. 2020 04, Reference Rate Reform (Topic 848 December 31, 2022. In December 2019, No. 2019 12, Simplifying the Accounting for Income Taxes 740 January 1, 2021, January 1, 2020, not In August 2018, No. 2018 13, Fair Value Measurement: Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement 1, 2 3 January 1, 2020, January 1, 2020, not In June 2016, No. 2016 13, Measurement of Credit Losses on Financial Instruments January 1, 2020, January 1, 2020, not

Note 3 - Revenues

Note 3 - Revenues	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	3. REVENUES Performance Obligations A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in FASB ASC 606. not not not The Company’s performance obligations are satisfied over time as work progresses or at a point in time. Revenues from products and services transferred to customers over time accounted for 89.2% and 92.6% of revenues for the quarters ended September 30, 2020 2019, nine September 30, 2020 2019, 606 55 255, not September 30, 2020 2019, nine September 30, 2020 2019, On September 30, 2020, September 30, 2020 Contract Estimates Accounting for long-term contracts involves the use of various techniques to estimate total contract revenue and costs. For long-term contracts, the Company estimates the profit on a contract as the difference between the total estimated revenue and expected costs to complete a contract, and recognizes that profit over the life of the contract. Contract estimates are based on various assumptions to project the outcome of future events that sometimes span multiple years. These assumptions include labor productivity and availability; the complexity of the work to be performed; the cost and availability of materials; the performance of subcontractors; and the availability and timing of funding from the customer. The Company’s contracts do not not not not The Company’s estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of anticipated performance and all information (historical, current and forecasted) that is reasonably available. Revenue by Category The following tables summarize revenues by segment and geography (in thousands): Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Geographic region: United States $ 119,334 $ 30,277 $ 62,796 $ 212,407 $ 112,357 $ 42,746 $ 76,801 $ 231,904 Canada 20,864 13,461 — 34,325 17,775 14,349 — 32,124 Europe 5,727 4,230 — 9,957 12,889 3,458 — 16,347 Other foreign 6,177 13,018 — 19,195 13,066 15,348 — 28,414 Total revenues $ 152,102 $ 60,986 $ 62,796 $ 275,884 $ 156,087 $ 75,901 $ 76,801 $ 308,789 Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Geographic region: United States $ 337,457 $ 99,624 $ 205,993 $ 643,074 $ 321,205 $ 116,093 $ 243,368 $ 680,666 Canada 46,092 35,083 — 81,175 47,320 42,264 — 89,584 Europe 17,500 10,320 — 27,820 38,302 11,429 — 49,731 Other foreign 18,689 37,518 — 56,207 36,242 48,210 — 84,452 Total revenues $ 419,738 $ 182,545 $ 205,993 $ 808,276 $ 443,069 $ 217,996 $ 243,368 $ 904,433 The following tables summarize revenues by segment and contract type (in thousands): Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Contract type: Fixed fee $ 130,685 $ 43,812 $ 1,003 $ 175,500 $ 139,363 $ 53,704 $ 1,003 $ 194,070 Time and materials — 8,696 61,793 70,489 — 16,092 75,798 91,890 Product sales 21,369 8,478 — 29,847 16,675 6,105 — 22,780 License fees 48 — — 48 49 — — 49 Total revenues $ 152,102 $ 60,986 $ 62,796 $ 275,884 $ 156,087 $ 75,901 $ 76,801 $ 308,789 Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Contract type: Fixed fee $ 364,591 $ 126,449 $ 3,946 $ 494,986 $ 394,489 $ 149,333 $ 3,213 $ 547,035 Time and materials — 31,501 202,047 233,548 — 48,351 240,155 288,506 Product sales 55,099 24,595 — 79,694 48,337 20,312 — 68,649 License fees 48 — — 48 243 — — 243 Total revenues $ 419,738 $ 182,545 $ 205,993 $ 808,276 $ 443,069 $ 217,996 $ 243,368 $ 904,433 Contract Balances The timing of revenue recognition, billings and cash collections results in billed accounts receivable, contract assets and contract liabilities on the Consolidated Balance Sheets. Contract assets represent work performed that could not not one For fixed fee and time-and-materials based contracts, amounts are billed as work progresses in accordance with agreed-upon contractual terms, either at periodic intervals or upon achievement of contractual milestones. Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. For some royalty license arrangements, minimum amounts are billed over the license term as quarterly royalty amounts are determined. This results in contract assets as the Company recognizes revenue for the license when the license is transferred to the customer at contract inception. The Company’s contract liabilities consist of advance payments, billings in excess of revenue recognized and deferred revenue. The Company’s contract assets and contract liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. Advance payments, billings in excess of revenue recognized and deferred revenue are each classified as current. Net contract assets (liabilities) consisted of the following (in thousands): September 30, 2020 (1) December 31, 2019 (2) Contract assets – current $ 51,150 $ 51,092 Contract liabilities – current (37,034 ) (37,562 ) Net contract assets $ 14,116 $ 13,530 ( 1 Amounts exclude contract assets of $0.9 million and contract liabilities of less than $0.1 million that were classified as held for sale at September 30, 2020 5 ( 2 Amounts exclude contract assets of $5.4 million and contract liabilities of $0.1 million that were classified as held for sale at December 31, 2019 5 Substantially all of the $37.6 million and $32.3 million contract liabilities balances at December 31, 2019 December 31, 2018 first nine 2020 2019

Note 4 - Restructuring

Note 4 - Restructuring	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Restructuring, Impairment, and Other Activities Disclosure [Text Block]	4. RESTRUCTURING On July 28, 2017, ® During 2018 2019, ® ® ® The Company completed the divestitures of Bayou and the Denmark CIPP business in 2018. ® 2019, 2020 1 2020 first 2021. first 2021 19, As part of efforts to optimize the cathodic protection operations in North America, management initiated plans during the fourth 2019 three four 2019. fourth 2019, During the second 2020, P2S “P2S” 19. third 2020, 19, Total pre-tax restructuring and related impairment charges since inception were $184.7 million ($166.0 million post-tax) and consisted of cash charges totaling $54.8 million and non-cash charges totaling $129.9 million. Cash charges included employee severance, retention, extension of benefits, employment assistance programs and other restructuring costs associated with the restructuring efforts described above. Non-cash charges included (i) $86.4 million related to goodwill and long-lived asset impairment charges recorded in 2017 The Company continues to monitor the impact COVID- 19 may During the quarters and nine September 30, 2020 2019 Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Severance and benefit related costs $ (89 ) $ 1,952 $ 172 $ 3 $ 2,038 $ 210 $ 447 $ 74 $ 416 $ 1,147 Contract termination costs — 188 86 — 274 201 8 — — 209 Relocation and other moving costs — 23 — — 23 79 — — — 79 Other restructuring costs (1) (1,386 ) 2,325 611 358 1,908 5,414 463 65 1,230 7,172 Total pre-tax restructuring charges $ (1,475 ) $ 4,488 $ 869 $ 361 $ 4,243 $ 5,904 $ 918 $ 139 $ 1,646 $ 8,607 ( 1 For the quarter ended September 30, 2020 September 30, 2019 Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Severance and benefit related costs $ 29 $ 2,921 $ 241 $ 335 $ 3,526 $ 1,043 $ 2,192 $ 114 $ 425 $ 3,774 Contract termination costs 36 417 148 — 601 534 815 — 98 1,447 Relocation and other moving costs — 126 34 — 160 130 144 — — 274 Other restructuring costs (1) (1,224 ) 3,404 3,996 2,236 8,412 8,854 1,192 65 2,383 12,494 Total pre-tax restructuring charges $ (1,159 ) $ 6,868 $ 4,419 $ 2,571 $ 12,699 $ 10,561 $ 4,343 $ 179 $ 2,906 $ 17,989 ( 1 For the nine September 30, 2020 P2S. nine September 30, 2019 Restructuring costs related to severance, other termination benefit costs and early contract termination costs were $2.3 million and $1.4 million for the quarters ended September 30, 2020 2019 nine September 30, 2020 2019, The following tables summarize all charges related to the Restructuring recognized in the quarters and nine September 30, 2020 2019 Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (1) Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (2) Cost of revenues $ — $ 1,830 $ — $ — $ 1,830 $ (30 ) $ (3 ) $ — $ — $ (33 ) Operating expenses (87 ) 527 611 495 1,546 748 315 65 732 1,860 Restructuring and related charges (89 ) 2,163 258 3 2,335 490 455 74 416 1,435 Other expense (1,299 ) (32 ) — (137 ) (1,468 ) 4,696 151 — 498 5,345 Total pre-tax restructuring charges $ (1,475 ) $ 4,488 $ 869 $ 361 $ 4,243 $ 5,904 $ 918 $ 139 $ 1,646 $ 8,607 ( 1 Total pre-tax restructuring charges for the quarter ended September 30, 2020 ( 2 Total pre-tax restructuring charges for the quarter ended September 30, 2019 Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (1) Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (2) Cost of revenues $ 69 $ 2,005 $ — $ — $ 2,074 $ (122 ) $ 559 $ — $ — $ 437 Operating expenses 229 2,169 1,781 1,714 5,893 3,070 583 65 1,877 5,595 Goodwill impairment — — 1,258 — 1,258 — — — — — Definite-lived intangible asset impairment — — 957 — 957 — — — — — Restructuring and related charges 65 3,464 423 335 4,287 1,707 3,151 114 523 5,495 Other expense (1,522 ) (770 ) — 522 (1,770 ) 5,906 50 — 506 6,462 Total pre-tax restructuring charges $ (1,159 ) $ 6,868 $ 4,419 $ 2,571 $ 12,699 $ 10,561 $ 4,343 $ 179 $ 2,906 $ 17,989 ( 1 Total pre-tax restructuring charges for the nine September 30, 2020 ( 2 Total pre-tax restructuring charges for the nine September 30, 2019 The following tables summarize restructuring activity during the first nine 2020 2019 Utilized in 2020 Reserves at December 31, 2019 2020 Charge to Income Foreign Currency Translation Cash(1) Non-Cash Reserves at September 30, 2020 Severance and benefit related costs $ 4,389 $ 3,526 $ (18 ) $ 6,567 $ — $ 1,330 Contract termination costs 953 601 (7 ) 961 — 586 Relocation and other moving costs 367 160 1 288 — 240 Other restructuring costs 2,379 8,412 (12 ) 6,139 3,282 1,358 Total pre-tax restructuring charges $ 8,088 $ 12,699 $ (36 ) $ 13,955 $ 3,282 $ 3,514 ( 1 Refers to cash utilized to settle charges during the first nine 2020 Utilized in 2019 Reserves at December 31, 2018 2019 Charge to Income Foreign Currency Translation Cash(1) Non-Cash Reserves at September 30, 2019 Severance and benefit related costs $ 1,742 $ 3,774 $ (26 ) $ 2,434 $ — $ 3,056 Contract termination costs 359 1,447 (30 ) 1,153 — 623 Relocation and other moving costs — 274 (4 ) 198 — 72 Other restructuring costs 311 12,494 (9 ) 5,954 6,419 423 Total pre-tax restructuring charges $ 2,412 $ 17,989 $ (69 ) $ 9,739 $ 6,419 $ 4,174 ( 1 Refers to cash utilized to settle charges during the first nine 2019

Note 5 - Assets and Liabilities

Note 5 - Assets and Liabilities Held for Sale	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	5. ASSETS AND LIABILITIES HELD FOR SALE During 2018 2019, 2019, During the first 2020, 1. 19 third 2020 2021. The relevant asset and liability balances at September 30, 2020 December 31, 2019 2019 The following table provides the components of assets and liabilities held for sale (in thousands): September 30, 2020(1) December 31, 2019(2) Assets held for sale: Current assets Receivables, net $ 423 $ 4,136 Retainage 483 518 Contract assets 882 5,350 Inventories 123 2,097 Prepaid expenses and other current assets 261 799 Total current assets 2,172 12,900 Property, plant & equipment, less accumulated depreciation 7,357 10,962 Goodwill 2,640 4,224 Intangible assets, less accumulated amortization 1,492 1,528 Operating lease assets 156 326 Other non-current assets 127 130 Impairment of assets held for sale (2,861 ) (13,978 ) Total assets held for sale $ 11,083 $ 16,092 Liabilities held for sale: Current liabilities Accounts payable $ 362 $ 2,174 Accrued expenses 1,306 3,961 Contract liabilities 44 122 Total current liabilities 1,712 6,257 Operating lease liabilities 97 174 Other non-current liabilities 55 54 Total liabilities held for sale $ 1,864 $ 6,485 ( 1 Includes Environmental Techniques and land held at Corporate. ( 2 Includes Insituform Australia, Insituform Spain, Environmental Techniques and land held at Corporate.

Note 6 - Leases

Note 6 - Leases	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	6. LEASES The Company’s operating lease portfolio includes operational field locations, administrative offices, equipment, vehicles and information technology equipment. The majority of the Company’s leases have remaining lease terms of 1 year to 20 years, some of which include options to extend the leases for 5 years or more. Right-of-use assets are presented within “Operating lease assets” on the Consolidated Balance Sheet. The current portion of operating lease liabilities are presented within “Accrued expenses”, and the non-current portion of operating lease liabilities are presented within “Operating lease liabilities” on the Consolidated Balance Sheet. Operating lease assets and liabilities are recognized based on the present value of lease payments over the lease term at inception. For purposes of calculating operating lease liabilities, lease terms may January 1, 2019 January 1, 2019. not The following table presents the components of lease expense (in thousands): Quarter Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Operating lease cost $ 4,912 $ 5,501 $ 15,050 $ 16,891 Short-term lease cost 5,422 8,125 16,288 20,846 Total lease cost $ 10,334 $ 13,626 $ 31,338 $ 37,737 Supplemental balance sheet information related to leases was as follows (in thousands): September 30, 2020(1) December 31, 2019(2) Operating leases: Operating lease assets $ 67,504 $ 71,466 Accrued expenses $ 16,490 $ 15,828 Other liabilities 52,418 56,253 Total operating lease liabilities $ 68,908 $ 72,081 Weighted-average remaining lease term (in years) 5.59 5.74 Weighted-average discount rate 4.86 % 5.71 % ( 1 Amounts exclude operating lease assets of $0.2 million, accrued expenses of less than $0.1 and other liabilities of less than $0.1 million that were classified as held for sale at September 30, 2020 5 ( 2 Amounts exclude operating lease assets of $0.3 million, accrued expenses of $0.2 million and other liabilities of $0.2 million that were classified as held for sale at December 31, 2019 ( 5

Note 7 - Goodwill and Intangibl

Note 7 - Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	7. GOODWILL AND INTANGIBLE ASSETS Goodwill The following table presents a reconciliation of the beginning and ending balances of goodwill (in thousands): Infrastructure Solutions Corrosion Protection Energy Services Total Balance, December 31, 2019 Goodwill, gross $ 240,160 $ 76,946 $ 81,504 $ 398,610 Accumulated impairment losses (62,848 ) (45,400 ) (33,527 ) (141,775 ) Goodwill, net 177,312 31,546 47,977 256,835 2020 Activity: Impairments (1)(2) — — (40,688 ) (40,688 ) Foreign currency translation 434 (241 ) — 193 Balance, September 30, 2020 Goodwill, gross 240,594 76,705 81,504 398,803 Accumulated impairment losses (62,848 ) (45,400 ) (74,215 ) (182,463 ) Goodwill, net $ 177,746 $ 31,305 $ 7,289 $ 216,340 ( 1 During the second 2020, 4 ( 2 During the third 2020, 2 Intangible Assets Intangible assets consisted of the following (in thousands): September 30, 2020 December 31, 2019 Weighted Average Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount License agreements 0.0 $ 3,894 $ (3,894 ) $ (0 ) $ 3,894 $ (3,824 ) $ 70 Leases 0.3 864 (842 ) 22 864 (777 ) 87 Trademarks (1) 5.6 15,466 (7,462 ) 8,004 15,699 (6,911 ) 8,788 Non-competes 0.5 2,051 (1,448 ) 604 2,301 (1,354 ) 947 Customer relationships (1) 6.3 156,897 (84,574 ) 72,323 157,576 (76,832 ) 80,744 Patents and acquired technology 5.9 39,167 (26,174 ) 12,993 39,289 (25,097 ) 14,192 Total intangible assets — $ 218,339 $ (124,394 ) $ 93,945 $ 219,623 $ (114,795 ) $ 104,828 ( 1 During the second 2020, 4 Amortization expense was $3.4 million and $3.4 million for the quarters ended September 30, 2020 2019 nine September 30, 2020 2019, December 31, 2020, 2021, 2022, 2023 2024

Note 8 - Long-term Debt and Cre

Note 8 - Long-term Debt and Credit Facility	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Debt Disclosure [Text Block]	8. LONG-TERM DEBT AND CREDIT FACILITY Long-term debt consisted of the following (in thousands): September 30, 2020 December 31, 2019 Term note, due February 27, 2023, annualized rates of 4.25% and 4.09%, respectively $ 227,500 $ 253,750 Line of credit, 4.25% and 4.01%, respectively — 24,000 Other notes with interest rates from 3.3% to 7.8% 692 770 Subtotal 228,192 278,520 Less – Current maturities of long-term debt 23,825 32,803 Less – Unamortized loan costs 2,767 2,088 Total $ 201,600 $ 243,629 In October 2015, February 2018, December 2018 April 2020, September 30, 2020, February 2023. Due to the potential impacts of COVID- 19 April 29, 2020 9. The Company paid expenses of $2.0 million associated with the amended Credit Facility, $1.5 million related to up-front lending fees and $0.5 million related to third second 2020. second 2020. Based on the April 2020 April 29, 2020 first 2021. September 30, 2020 The Company’s indebtedness at September 30, 2020 first nine 2020 As of September 30, 2020 The Company’s indebtedness at December 31, 2019 third At September 30, 2020 December 31, 2019 2 2. In October 2015, October 2020 $262.5 $262.5 $262.5 $262.5 September 30, 2020 13. In March 2018, October 2020 February 2023 $170.6 13. The amended 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 amended Credit Facility’s credit agreement, the financial covenant requirements as of September 30, 2020 • Consolidated financial leverage ratio compares consolidated funded indebtedness to amended Credit Facility defined income with a maximum amount not 1.00. September 30, 2020 1.00 September 30, 2020, • Consolidated fixed charge coverage ratio compares amended Credit Facility defined income to amended Credit Facility defined fixed charges with a minimum permitted ratio of not 1.00. September 30, 2020, 1.36 1.00. At September 30, 2020

Note 9 - Stockholders' Equity a

Note 9 - Stockholders' Equity and Equity Compensation	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	9. STOCKHOLDERS’ EQUITY AND EQUITY COMPENSATION Share Repurchase Plan In December 2019, two million two million December 2018. September 30, 2020, 2018 two million 2019 one 10b5 1 1934. March 2020, 10b5 1 19. not April 29, 2020, June 30, 2021 1.00; $20.0 1.00, 1.00; zero 1.00. The Company’s board of directors also approved the purchase of up to $10.0 million of our common stock in each calendar year in connection with the Company’s equity compensation programs for employees. Effective April 29, 2020, June 30, 2021. may may During the first nine 2020 During the first nine 2019, Equity-Based Compensation Plans In April 2016, 2016 2017 2016 “2016 April 2018, third 2016 2016 2016 2013 2016 September 30, 2020 2016 In April 2016, 2016 “2016 2011 April 2019, 2016 2016 2016 2016 2016 September 30, 2020 2016 Stock Awards Stock awards, which include shares of restricted stock, restricted stock units and performance stock 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 performance stock units causes the reversal of all previous expense to be recorded as a reduction of current period expense. A summary of the stock award activity is as follows: Stock Awards Weighted Average Award Date Fair Value Outstanding at December 31, 2019 1,034,964 $ 23.20 Period Activity: Restricted stock units awarded 405,453 19.89 Performance stock units awarded 131,755 22.96 Restricted stock units distributed (198,433 ) 22.24 Performance stock units distributed (71,541 ) 28.18 Restricted stock units forfeited (33,297 ) 21.01 Performance stock units forfeited (76,282 ) 27.46 Outstanding at September 30, 2020 1,192,619 $ 21.70 Expense associated with stock awards was $3.4 million and $1.5 million for the quarters ended September 30, 2020 2019 nine September 30, 2020 2019, September 30, 2020 Deferred Stock Unit Awards Deferred stock units are generally awarded to directors of the Company and represent the Company’s obligation to transfer one April 2019, 2016 one A summary of deferred stock unit activity is as follows: Deferred Stock Units Weighted Average Award Date Fair Value Outstanding at December 31, 2019 253,340 $ 20.71 Period Activity: Awarded 67,056 14.61 Distributed (58,267 ) 21.63 Outstanding at September 30, 2020 262,129 $ 18.95 Expense associated with deferred stock unit awards was $0.3 million and $0.3 million for the quarters ended September 30, 2020 2019 nine September 30, 2020 2019, September 30, 2020 Stock Options Stock options on the Company’s common stock were previously awarded from time to time to executive officers and certain key employees of the Company. Stock options granted generally had a term of seven ten first 2019 no September 30, 2020 December 31, 2019.

Note 10 - Taxes on Income

Note 10 - Taxes on Income	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	10. TAXES ON INCOME The Company’s effective tax rate in the quarter and nine September 30, 2020 no The Company’s effective tax rate in the quarter and nine September 30, 2019 third 2019 third 2019. not no nine not no

Note 11 - Commitments and Conti

Note 11 - Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	11. 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 Purchase Commitments The Company had no September 30, 2020 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 third not no not 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 September 30, 2020

Note 12 - Segment Reporting

Note 12 - Segment Reporting	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	12. SEGMENT REPORTING The Company has three 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. The Company evaluates performance based on stand-alone operating income (loss), which includes acquisition and divestiture expenses and restructuring charges, if applicable. Financial information by segment was as follows (in thousands): Quarter Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Revenues: Infrastructure Solutions $ 152,102 $ 156,087 $ 419,738 $ 443,069 Corrosion Protection 60,986 75,901 182,545 217,996 Energy Services 62,796 76,801 205,993 243,368 Total revenues $ 275,884 $ 308,789 $ 808,276 $ 904,433 Gross profit: Infrastructure Solutions $ 41,358 $ 39,569 $ 108,395 $ 105,026 Corrosion Protection 13,432 17,232 36,460 46,797 Energy Services 5,470 9,991 18,864 30,701 Total gross profit $ 60,260 $ 66,792 $ 163,719 $ 182,524 Operating income (loss): Infrastructure Solutions (1) $ 23,497 $ 18,376 $ 58,056 $ 33,211 Corrosion Protection (2) (1,357 ) 2,362 (7,105 ) (3,261 ) Energy Services (3) (41,701 ) 2,257 (45,238 ) 7,479 Corporate (4) (7,679 ) (8,346 ) (22,830 ) (23,095 ) Total operating income (loss) (27,240 ) 14,649 (17,117 ) 14,334 Other income (expense): Interest expense (4,288 ) (3,446 ) (12,174 ) (10,602 ) Interest income 258 268 701 814 Other (5) 245 (5,236 ) 1,634 (6,925 ) Total other expense (3,785 ) (8,414 ) (9,839 ) (16,713 ) Income (loss) before taxes (benefit) $ (31,025 ) $ 6,235 $ (26,956 ) $ (2,379 ) ( 1 Operating income in the third 2020 2019 4 third 2019 first nine 2020 2019 4 first nine 2020 first nine 2019 ( 2 Operating income (loss) in the third 2020 2019 4 first nine 2020 2019 4 first nine 2019 ( 3 Operating income (loss) in the third 2020 2019 4 third 2020 first nine 2020 2019 4 first nine 2020 ( 4 Operating loss in the third 2020 2019 4 first nine 2020 2019 4 ( 5 Other income in the third 2020 4 1 third 2019 4 first nine 2020 2019 4 first nine 2020 1 The following table summarizes revenues and gross profit by geographic region (in thousands): Quarter Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Revenues: (1) United States $ 212,407 $ 231,904 $ 643,074 $ 680,666 Canada 34,325 32,124 81,175 89,584 Europe 9,957 16,347 27,820 49,731 Other foreign 19,195 28,414 56,207 84,452 Total revenues $ 275,884 $ 308,789 $ 808,276 $ 904,433 Gross profit: (1) United States $ 44,808 $ 48,331 $ 125,778 $ 130,950 Canada 7,003 6,424 15,103 14,906 Europe 3,129 4,309 8,333 11,139 Other foreign 5,320 7,728 14,505 25,529 Total gross profit $ 60,260 $ 66,792 $ 163,719 $ 182,524 ( 1 Revenues and gross profit are attributed to the country of origin

Note 13 - Derivative Financial

Note 13 - Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]	13. DERIVATIVE FINANCIAL INSTRUMENTS As a matter of policy, the Company uses derivatives for risk management purposes, and does not may no September 30, 2020 December 31, 2019 The Company also engages in regular inter-company trade activities and receives royalty payments and management fees from certain of its wholly-owned entities, paid in local currency, rather than the Company’s functional currency, U.S. dollars. From time to time, the Company utilizes foreign currency forward exchange contracts to mitigate the currency risk associated with the anticipated future payments from certain of its international entities. No first nine 2020. first nine 2019 In October 2015, October 2020 $262.5 $262.5 On March 12, 2018, October 2020 February 2023 The following table summarizes the Company’s derivative position at September 30, 2020 Position Notional Amount Weighted Average Remaining Maturity In Years Average Exchange Rate Interest Rate Swap — $ 170,625,000 2.25 — The following table provides a summary of the fair value amounts of our derivative instruments, all of which are Level 2 2 Designation of Derivatives Balance Sheet Location September 30, 2020 December 31, 2019 Derivatives Designated as Hedging Instruments: Interest Rate Swaps Other non-current assets $ — $ 261 Total Assets $ — $ 261 Interest Rate Swaps Other non-current liabilities $ 10,078 $ 4,899 Total Liabilities $ 10,078 $ 4,899 Total Derivative Assets $ — $ 261 Total Derivative Liabilities 10,078 4,899 Total Net Derivative Liability $ (10,078 ) $ (4,638 )

Significant Accounting Policies

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Comprehensive Income, Policy [Policy Text Block]	Accumulated Other Comprehensive Loss As set forth below, the Company’s accumulated other comprehensive loss is comprised of three September 30, 2020 December 31, 2019 Currency translation adjustments (1) $ (26,439 ) $ (27,241 ) Derivative hedging activity (10,078 ) (4,522 ) Pension activity (909 ) (931 ) Total accumulated other comprehensive loss $ (37,426 ) $ (32,694 ) ( 1 During the nine September 30, 2020, 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 loss” in total stockholders’ equity. Net foreign exchange transaction losses of $0.7 million and gains of $0.1 million in the third 2020 2019 nine September 30, 2020 2019,
Income Tax, Policy [Policy Text Block]	Taxation The Company provides for estimated income taxes payable or refundable on current year income tax returns as well as the estimated future tax effects attributable to temporary differences and carryforwards, based upon enacted tax laws and tax rates, and in accordance with FASB ASC 740, Income Taxes 740” 740 not not may
Earnings Per Share, Policy [Policy Text Block]	Earnings per Share Earnings per share have been calculated using the following share information: Quarter Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Weighted average number of common shares used for basic EPS 30,770,324 30,866,188 30,738,150 31,259,594 Effect of dilutive stock options and restricted and deferred stock unit awards — 511,244 — — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 30,770,324 31,377,432 30,738,150 31,259,594 The Company excluded 501,802 and 484,712 restricted and deferred stock units for the quarter and nine September 30, 2020, nine September 30, 2019
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash, Cash Equivalents and Restricted Cash The Company classifies highly liquid investments with original maturities of 90 Cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets and Consolidated Statements of Cash Flows are as follows (in thousands): Balance sheet data September 30, 2020 December 31, 2019 Cash and cash equivalents $ 75,758 $ 64,874 Restricted cash 986 1,348 Cash, cash equivalents and restricted cash $ 76,744 $ 66,222 Restricted cash held in escrow primarily relates to funds reserved for legal requirements, deposits made in lieu of retention on specific projects performed for municipalities and state agencies, or advance customer payments and compensating balances for bank undertakings in Europe. Restricted cash related to operations is similar to retainage, and is, therefore, classified as a current asset, consistent with the Company’s policy on retainage.
Fair Value Measurement, Policy [Policy Text Block]	Fair Value Measurements FASB ASC 820, Fair Value Measurements 820” three • Level 1 • Level 2 • Level 3 no The Company uses these levels of hierarchy to measure the fair value of certain financial instruments on a recurring basis, such as for derivative instruments; on a non-recurring basis, such as for acquisitions and impairment testing; for disclosure purposes, such as for long-term debt; and for other applications, as discussed in their respective footnotes. Changes in assumptions or estimation methods could affect the fair value estimates. Other financial instruments including notes payable are recorded at cost, which approximates fair value, and is based on Level 2 no 1, 2 3 nine September 30, 2020 2019.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Long-Lived Assets Property, plant and equipment and other identified intangibles (primarily customer relationships, patents and acquired technologies, trademarks, licenses and non-compete agreements) are recorded at cost, net of accumulated depreciation, amortization and impairment, and, except for goodwill, are depreciated or amortized on a straight-line basis over their estimated useful lives. Changes in circumstances such as technological advances, changes to the Company’s business model or changes in the Company’s capital strategy can result in the actual useful lives differing from the Company’s estimates. If the Company determines that the useful life of its property, plant and equipment or its identified intangible assets should be shortened, the Company would prospectively depreciate or amortize the net book value in excess of the salvage value over its revised remaining useful life, thereby increasing depreciation or amortization expense. Long-lived assets, including property, plant and equipment and other intangibles, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not may Impairment Review – Third Quarter 2020 The oil and gas industry experienced an unprecedented disruption during the first nine 2020 19 third 2020 2020 2021. 360, Property, Plant and Equipment 360” The assets of an asset group represent the lowest level for which identifiable cash flows can be determined independent of other groups of assets and liabilities. The Energy Services asset group was the only at-risk asset group reviewed for impairment. The Company developed internal forward business plans under the guidance of local and regional leadership to determine the undiscounted expected future cash flows derived from Energy Services’ long-lived assets. Such were based on management’s best estimates considering the likelihood of various outcomes. Based on the internal projections, the Company determined that the sum of the undiscounted expected future cash flows for the Energy Services asset group exceeded the carrying value of the assets and no The fair value estimates described above were determined using observable inputs and significant unobservable inputs, which are based on level 3
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill Under FASB ASC 350, Goodwill and Other 350” may not not • significant underperformance of a segment relative to expected, historical or forecasted operating results; • significant negative industry or economic trends; • significant changes in the strategy for a segment including extended slowdowns in the segment’s market; • a decrease in market capitalization below the Company’s book value; and • a significant change in regulations. Whether during the annual impairment assessment or during a trigger-based impairment review, the Company estimates the fair value of its reporting units and compares such fair value to the carrying value of those reporting units to determine if there are any indications of goodwill impairment. Fair value of reporting units is estimated using a combination of two two The market approach estimates fair value by first The income approach is based on forecasted future (debt-free) cash flows that are discounted to present value using factors that consider timing and risk of future cash flows. The Company believes this approach is appropriate because it provides a fair value estimate based upon the reporting unit’s expected long-term operating cash flow performance. Discounted cash flow projections are based on financial forecasts developed from operating plans and economic outlooks, revenue growth rates, estimates of future expected changes in operating margins, terminal value growth rates, future capital expenditures and changes in working capital requirements. Estimates of discounted cash flows may The discount rate applied to the estimated future cash flows is one twenty may Impairment Review – Third Quarter 2020 Given the prolonged uncertainty in the oil and gas markets and the market assessment of the Energy Services reporting unit discussed above, the Company evaluated the goodwill of its Energy Services reporting unit during the third 2020 third 820 350, The values derived from both the income approach and the market approach decreased from the October 1, 2019 October 1, 2019 twenty October 1, 2019 2020 2021. 100 Based on the impairment analysis, the Company determined that recorded goodwill at the Energy Services reporting unit was impaired by $39.4 million, which was recorded to “Goodwill impairment” in the Consolidated Statement of Operations during the third 2020. September 30, 2020, 19 not The fair value estimates described above were determined using observable inputs and significant unobservable inputs, which are based on level 3 no five
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	Investments in Variable Interest Entities The Company evaluates all transactions and relationships with variable interest entities (“VIE”) to determine whether the Company is the primary beneficiary of the entities in accordance with FASB ASC 810, Consolidation no September 30, 2020 Financial data for consolidated variable interest entities are summarized in the following tables (in thousands): Balance sheet data September 30, 2020 December 31, 2019 Current assets $ 21,057 $ 18,304 Non-current assets 7,764 7,635 Current liabilities 9,721 8,261 Non-current liabilities 1,557 1,962 Quarter Ended September 30, Nine Months Ended September 30, Statement of operations data 2020 2019 2020 2019 Revenue $ 8,677 $ 7,275 $ 22,132 $ 20,719 Gross profit 3,354 2,412 7,735 6,463 Net income (loss) attributable to Aegion Corporation 534 (2,154 ) 889 (2,773 )
New Accounting Pronouncements, Policy [Policy Text Block]	Newly Issued Accounting Pronouncements In March 2020, No. 2020 04, Reference Rate Reform (Topic 848 December 31, 2022. In December 2019, No. 2019 12, Simplifying the Accounting for Income Taxes 740 January 1, 2021, January 1, 2020, not In August 2018, No. 2018 13, Fair Value Measurement: Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement 1, 2 3 January 1, 2020, January 1, 2020, not In June 2016, No. 2016 13, Measurement of Credit Losses on Financial Instruments January 1, 2020, January 1, 2020, not

Note 2 - Accounting Policies (T

Note 2 - Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	September 30, 2020 December 31, 2019 Currency translation adjustments (1) $ (26,439 ) $ (27,241 ) Derivative hedging activity (10,078 ) (4,522 ) Pension activity (909 ) (931 ) Total accumulated other comprehensive loss $ (37,426 ) $ (32,694 )
Schedule of Weighted Average Number of Shares [Table Text Block]	Quarter Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Weighted average number of common shares used for basic EPS 30,770,324 30,866,188 30,738,150 31,259,594 Effect of dilutive stock options and restricted and deferred stock unit awards — 511,244 — — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 30,770,324 31,377,432 30,738,150 31,259,594
Restrictions on Cash and Cash Equivalents [Table Text Block]	Balance sheet data September 30, 2020 December 31, 2019 Cash and cash equivalents $ 75,758 $ 64,874 Restricted cash 986 1,348 Cash, cash equivalents and restricted cash $ 76,744 $ 66,222
Schedule of Variable Interest Entities [Table Text Block]	Balance sheet data September 30, 2020 December 31, 2019 Current assets $ 21,057 $ 18,304 Non-current assets 7,764 7,635 Current liabilities 9,721 8,261 Non-current liabilities 1,557 1,962 Quarter Ended September 30, Nine Months Ended September 30, Statement of operations data 2020 2019 2020 2019 Revenue $ 8,677 $ 7,275 $ 22,132 $ 20,719 Gross profit 3,354 2,412 7,735 6,463 Net income (loss) attributable to Aegion Corporation 534 (2,154 ) 889 (2,773 )

Note 3 - Revenues (Tables)

Note 3 - Revenues (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Disaggregation of Revenue [Table Text Block]	Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Geographic region: United States $ 119,334 $ 30,277 $ 62,796 $ 212,407 $ 112,357 $ 42,746 $ 76,801 $ 231,904 Canada 20,864 13,461 — 34,325 17,775 14,349 — 32,124 Europe 5,727 4,230 — 9,957 12,889 3,458 — 16,347 Other foreign 6,177 13,018 — 19,195 13,066 15,348 — 28,414 Total revenues $ 152,102 $ 60,986 $ 62,796 $ 275,884 $ 156,087 $ 75,901 $ 76,801 $ 308,789 Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Geographic region: United States $ 337,457 $ 99,624 $ 205,993 $ 643,074 $ 321,205 $ 116,093 $ 243,368 $ 680,666 Canada 46,092 35,083 — 81,175 47,320 42,264 — 89,584 Europe 17,500 10,320 — 27,820 38,302 11,429 — 49,731 Other foreign 18,689 37,518 — 56,207 36,242 48,210 — 84,452 Total revenues $ 419,738 $ 182,545 $ 205,993 $ 808,276 $ 443,069 $ 217,996 $ 243,368 $ 904,433 Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Contract type: Fixed fee $ 130,685 $ 43,812 $ 1,003 $ 175,500 $ 139,363 $ 53,704 $ 1,003 $ 194,070 Time and materials — 8,696 61,793 70,489 — 16,092 75,798 91,890 Product sales 21,369 8,478 — 29,847 16,675 6,105 — 22,780 License fees 48 — — 48 49 — — 49 Total revenues $ 152,102 $ 60,986 $ 62,796 $ 275,884 $ 156,087 $ 75,901 $ 76,801 $ 308,789 Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Contract type: Fixed fee $ 364,591 $ 126,449 $ 3,946 $ 494,986 $ 394,489 $ 149,333 $ 3,213 $ 547,035 Time and materials — 31,501 202,047 233,548 — 48,351 240,155 288,506 Product sales 55,099 24,595 — 79,694 48,337 20,312 — 68,649 License fees 48 — — 48 243 — — 243 Total revenues $ 419,738 $ 182,545 $ 205,993 $ 808,276 $ 443,069 $ 217,996 $ 243,368 $ 904,433
Contract Asset and Liability [Table Text Block]	September 30, 2020 (1) December 31, 2019 (2) Contract assets – current $ 51,150 $ 51,092 Contract liabilities – current (37,034 ) (37,562 ) Net contract assets $ 14,116 $ 13,530

Note 4 - Restructuring (Tables)

Note 4 - Restructuring (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Restructuring and Related Costs [Table Text Block]	Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Severance and benefit related costs $ (89 ) $ 1,952 $ 172 $ 3 $ 2,038 $ 210 $ 447 $ 74 $ 416 $ 1,147 Contract termination costs — 188 86 — 274 201 8 — — 209 Relocation and other moving costs — 23 — — 23 79 — — — 79 Other restructuring costs (1) (1,386 ) 2,325 611 358 1,908 5,414 463 65 1,230 7,172 Total pre-tax restructuring charges $ (1,475 ) $ 4,488 $ 869 $ 361 $ 4,243 $ 5,904 $ 918 $ 139 $ 1,646 $ 8,607 Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Severance and benefit related costs $ 29 $ 2,921 $ 241 $ 335 $ 3,526 $ 1,043 $ 2,192 $ 114 $ 425 $ 3,774 Contract termination costs 36 417 148 — 601 534 815 — 98 1,447 Relocation and other moving costs — 126 34 — 160 130 144 — — 274 Other restructuring costs (1) (1,224 ) 3,404 3,996 2,236 8,412 8,854 1,192 65 2,383 12,494 Total pre-tax restructuring charges $ (1,159 ) $ 6,868 $ 4,419 $ 2,571 $ 12,699 $ 10,561 $ 4,343 $ 179 $ 2,906 $ 17,989 Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (1) Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (2) Cost of revenues $ — $ 1,830 $ — $ — $ 1,830 $ (30 ) $ (3 ) $ — $ — $ (33 ) Operating expenses (87 ) 527 611 495 1,546 748 315 65 732 1,860 Restructuring and related charges (89 ) 2,163 258 3 2,335 490 455 74 416 1,435 Other expense (1,299 ) (32 ) — (137 ) (1,468 ) 4,696 151 — 498 5,345 Total pre-tax restructuring charges $ (1,475 ) $ 4,488 $ 869 $ 361 $ 4,243 $ 5,904 $ 918 $ 139 $ 1,646 $ 8,607 Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (1) Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (2) Cost of revenues $ 69 $ 2,005 $ — $ — $ 2,074 $ (122 ) $ 559 $ — $ — $ 437 Operating expenses 229 2,169 1,781 1,714 5,893 3,070 583 65 1,877 5,595 Goodwill impairment — — 1,258 — 1,258 — — — — — Definite-lived intangible asset impairment — — 957 — 957 — — — — — Restructuring and related charges 65 3,464 423 335 4,287 1,707 3,151 114 523 5,495 Other expense (1,522 ) (770 ) — 522 (1,770 ) 5,906 50 — 506 6,462 Total pre-tax restructuring charges $ (1,159 ) $ 6,868 $ 4,419 $ 2,571 $ 12,699 $ 10,561 $ 4,343 $ 179 $ 2,906 $ 17,989
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]	Utilized in 2020 Reserves at December 31, 2019 2020 Charge to Income Foreign Currency Translation Cash(1) Non-Cash Reserves at September 30, 2020 Severance and benefit related costs $ 4,389 $ 3,526 $ (18 ) $ 6,567 $ — $ 1,330 Contract termination costs 953 601 (7 ) 961 — 586 Relocation and other moving costs 367 160 1 288 — 240 Other restructuring costs 2,379 8,412 (12 ) 6,139 3,282 1,358 Total pre-tax restructuring charges $ 8,088 $ 12,699 $ (36 ) $ 13,955 $ 3,282 $ 3,514 Utilized in 2019 Reserves at December 31, 2018 2019 Charge to Income Foreign Currency Translation Cash(1) Non-Cash Reserves at September 30, 2019 Severance and benefit related costs $ 1,742 $ 3,774 $ (26 ) $ 2,434 $ — $ 3,056 Contract termination costs 359 1,447 (30 ) 1,153 — 623 Relocation and other moving costs — 274 (4 ) 198 — 72 Other restructuring costs 311 12,494 (9 ) 5,954 6,419 423 Total pre-tax restructuring charges $ 2,412 $ 17,989 $ (69 ) $ 9,739 $ 6,419 $ 4,174

Note 5 - Assets and Liabiliti_2

Note 5 - Assets and Liabilities Held for Sale (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Disposal Groups, Including Discontinued Operations [Table Text Block]	September 30, 2020(1) December 31, 2019(2) Assets held for sale: Current assets Receivables, net $ 423 $ 4,136 Retainage 483 518 Contract assets 882 5,350 Inventories 123 2,097 Prepaid expenses and other current assets 261 799 Total current assets 2,172 12,900 Property, plant & equipment, less accumulated depreciation 7,357 10,962 Goodwill 2,640 4,224 Intangible assets, less accumulated amortization 1,492 1,528 Operating lease assets 156 326 Other non-current assets 127 130 Impairment of assets held for sale (2,861 ) (13,978 ) Total assets held for sale $ 11,083 $ 16,092 Liabilities held for sale: Current liabilities Accounts payable $ 362 $ 2,174 Accrued expenses 1,306 3,961 Contract liabilities 44 122 Total current liabilities 1,712 6,257 Operating lease liabilities 97 174 Other non-current liabilities 55 54 Total liabilities held for sale $ 1,864 $ 6,485

Note 6 - Leases (Tables)

Note 6 - Leases (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Lease, Cost [Table Text Block]	Quarter Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Operating lease cost $ 4,912 $ 5,501 $ 15,050 $ 16,891 Short-term lease cost 5,422 8,125 16,288 20,846 Total lease cost $ 10,334 $ 13,626 $ 31,338 $ 37,737
Lease, Supplemental Financial Statement Disclosures, Balance Sheet [Table Text Block]	September 30, 2020(1) December 31, 2019(2) Operating leases: Operating lease assets $ 67,504 $ 71,466 Accrued expenses $ 16,490 $ 15,828 Other liabilities 52,418 56,253 Total operating lease liabilities $ 68,908 $ 72,081 Weighted-average remaining lease term (in years) 5.59 5.74 Weighted-average discount rate 4.86 % 5.71 %

Note 7 - Goodwill and Intangi_2

Note 7 - Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Schedule of Goodwill [Table Text Block]	Infrastructure Solutions Corrosion Protection Energy Services Total Balance, December 31, 2019 Goodwill, gross $ 240,160 $ 76,946 $ 81,504 $ 398,610 Accumulated impairment losses (62,848 ) (45,400 ) (33,527 ) (141,775 ) Goodwill, net 177,312 31,546 47,977 256,835 2020 Activity: Impairments (1)(2) — — (40,688 ) (40,688 ) Foreign currency translation 434 (241 ) — 193 Balance, September 30, 2020 Goodwill, gross 240,594 76,705 81,504 398,803 Accumulated impairment losses (62,848 ) (45,400 ) (74,215 ) (182,463 ) Goodwill, net $ 177,746 $ 31,305 $ 7,289 $ 216,340
Schedule of Finite-Lived Intangible Assets [Table Text Block]	September 30, 2020 December 31, 2019 Weighted Average Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount License agreements 0.0 $ 3,894 $ (3,894 ) $ (0 ) $ 3,894 $ (3,824 ) $ 70 Leases 0.3 864 (842 ) 22 864 (777 ) 87 Trademarks (1) 5.6 15,466 (7,462 ) 8,004 15,699 (6,911 ) 8,788 Non-competes 0.5 2,051 (1,448 ) 604 2,301 (1,354 ) 947 Customer relationships (1) 6.3 156,897 (84,574 ) 72,323 157,576 (76,832 ) 80,744 Patents and acquired technology 5.9 39,167 (26,174 ) 12,993 39,289 (25,097 ) 14,192 Total intangible assets — $ 218,339 $ (124,394 ) $ 93,945 $ 219,623 $ (114,795 ) $ 104,828

Note 8 - Long-term Debt and C_2

Note 8 - Long-term Debt and Credit Facility (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Schedule of Long-term Debt Instruments [Table Text Block]	September 30, 2020 December 31, 2019 Term note, due February 27, 2023, annualized rates of 4.25% and 4.09%, respectively $ 227,500 $ 253,750 Line of credit, 4.25% and 4.01%, respectively — 24,000 Other notes with interest rates from 3.3% to 7.8% 692 770 Subtotal 228,192 278,520 Less – Current maturities of long-term debt 23,825 32,803 Less – Unamortized loan costs 2,767 2,088 Total $ 201,600 $ 243,629

Note 9 - Stockholders' Equity_2

Note 9 - Stockholders' Equity and Equity Compensation (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	Stock Awards Weighted Average Award Date Fair Value Outstanding at December 31, 2019 1,034,964 $ 23.20 Period Activity: Restricted stock units awarded 405,453 19.89 Performance stock units awarded 131,755 22.96 Restricted stock units distributed (198,433 ) 22.24 Performance stock units distributed (71,541 ) 28.18 Restricted stock units forfeited (33,297 ) 21.01 Performance stock units forfeited (76,282 ) 27.46 Outstanding at September 30, 2020 1,192,619 $ 21.70
Share-based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block]	Deferred Stock Units Weighted Average Award Date Fair Value Outstanding at December 31, 2019 253,340 $ 20.71 Period Activity: Awarded 67,056 14.61 Distributed (58,267 ) 21.63 Outstanding at September 30, 2020 262,129 $ 18.95

Note 12 - Segment Reporting (Ta

Note 12 - Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Quarter Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Revenues: Infrastructure Solutions $ 152,102 $ 156,087 $ 419,738 $ 443,069 Corrosion Protection 60,986 75,901 182,545 217,996 Energy Services 62,796 76,801 205,993 243,368 Total revenues $ 275,884 $ 308,789 $ 808,276 $ 904,433 Gross profit: Infrastructure Solutions $ 41,358 $ 39,569 $ 108,395 $ 105,026 Corrosion Protection 13,432 17,232 36,460 46,797 Energy Services 5,470 9,991 18,864 30,701 Total gross profit $ 60,260 $ 66,792 $ 163,719 $ 182,524 Operating income (loss): Infrastructure Solutions (1) $ 23,497 $ 18,376 $ 58,056 $ 33,211 Corrosion Protection (2) (1,357 ) 2,362 (7,105 ) (3,261 ) Energy Services (3) (41,701 ) 2,257 (45,238 ) 7,479 Corporate (4) (7,679 ) (8,346 ) (22,830 ) (23,095 ) Total operating income (loss) (27,240 ) 14,649 (17,117 ) 14,334 Other income (expense): Interest expense (4,288 ) (3,446 ) (12,174 ) (10,602 ) Interest income 258 268 701 814 Other (5) 245 (5,236 ) 1,634 (6,925 ) Total other expense (3,785 ) (8,414 ) (9,839 ) (16,713 ) Income (loss) before taxes (benefit) $ (31,025 ) $ 6,235 $ (26,956 ) $ (2,379 ) Quarter Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Revenues: (1) United States $ 212,407 $ 231,904 $ 643,074 $ 680,666 Canada 34,325 32,124 81,175 89,584 Europe 9,957 16,347 27,820 49,731 Other foreign 19,195 28,414 56,207 84,452 Total revenues $ 275,884 $ 308,789 $ 808,276 $ 904,433 Gross profit: (1) United States $ 44,808 $ 48,331 $ 125,778 $ 130,950 Canada 7,003 6,424 15,103 14,906 Europe 3,129 4,309 8,333 11,139 Other foreign 5,320 7,728 14,505 25,529 Total gross profit $ 60,260 $ 66,792 $ 163,719 $ 182,524

Note 13 - Derivative Financia_2

Note 13 - Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	Position Notional Amount Weighted Average Remaining Maturity In Years Average Exchange Rate Interest Rate Swap — $ 170,625,000 2.25 —
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	Designation of Derivatives Balance Sheet Location September 30, 2020 December 31, 2019 Derivatives Designated as Hedging Instruments: Interest Rate Swaps Other non-current assets $ — $ 261 Total Assets $ — $ 261 Interest Rate Swaps Other non-current liabilities $ 10,078 $ 4,899 Total Liabilities $ 10,078 $ 4,899 Total Derivative Assets $ — $ 261 Total Derivative Liabilities 10,078 4,899 Total Net Derivative Liability $ (10,078 ) $ (4,638 )

Note 2 - Accounting Policies (D

Note 2 - Accounting Policies (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)shares	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)shares		Sep. 30, 2019USD ($)shares	Dec. 31, 2019USD ($)	Oct. 01, 2019
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax, Total			$ 1,500
Foreign Currency Transaction Gain (Loss), Realized			(420)		$ (370)
Goodwill, Impairment Loss	$ 39,430	$ 0	40,688	[1],[2]	$ 0
Goodwill, Ending Balance	$ 216,340		$ 216,340			$ 256,835
Energy Services [Member]
Reporting Unit, Percentage of Carrying Amount in Excess of Fair Value	31.30%		31.30%
Reporting Unit, Increase (Decrease) in Fair Value			$ (67,800)
Reporting Unit, Increase (Decrease) in Fair Value, Percentage			(44.00%)
Goodwill, Impairment Loss			$ 39,400
Goodwill, Ending Balance	$ 7,300		$ 7,300
Energy Services [Member] | Weighted Average Cost of Capital [Member]
Goodwill, Measurement Input	15		15				13
Energy Services [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]
Goodwill, Measurement Input	3.2		3.2				3.4
Stock Options and Restricted and Deferred Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	501,802		484,712		497,192
Other Expense [Member]
Foreign Currency Transaction Gain (Loss), Realized	$ 700	$ 100	$ (400)		$ (400)
[1]	During the second quarter of 2020, the Company recorded a $1.3 million goodwill impairment related to restructuring activities within Energy Services (see Note 4).
[2]	During the third quarter of 2020, the Company recorded a $39.4 million goodwill impairment within Energy Services (see Note 2).

Note 2 - Accounting Policies -

Note 2 - Accounting Policies - Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Currency translation adjustments	[1]	$ (26,439)	$ (27,241)
Derivative hedging activity		(10,078)	(4,522)
Pension activity		(909)	(931)
Total accumulated other comprehensive loss		$ (37,426)	$ (32,694)
[1]	During the nine months ended September 30, 2020, as a result of disposing of certain international entities, $1.5 million was reclassified out of accumulated other comprehensive loss to "Other expense" in the Consolidated Statements of Operations.

Note 2 - Accounting Policies _2

Note 2 - Accounting Policies - Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Weighted average number of common shares used for basic EPS (in shares)	30,770,324	30,866,188	30,738,150	31,259,594
Effect of dilutive stock options and restricted and deferred stock unit awards (in shares)	0	511,244	0	0
Weighted average number of common shares and dilutive potential common stock used for dilutive EPS (in shares)	30,770,324	31,377,432	30,738,150	31,259,594

Note 2 - Accounting Policies _3

Note 2 - Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 75,758	$ 64,874
Restricted cash	986	1,348
Cash, cash equivalents and restricted cash	$ 76,744	$ 66,222

Note 2 - Accounting Policies _4

Note 2 - Accounting Policies - Investments in Variable Interest Entities (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Current assets		$ 434,980		$ 434,980		$ 450,215
Current liabilities		222,090		222,090		234,041
Revenue	[1]	275,884	$ 308,789	808,276	$ 904,433
Gross profit	[1]	60,260	66,792	163,719	182,524
Net income (loss) attributable to Aegion Corporation		(28,474)	6,036	(26,250)	(6,331)
Variable Interest Entity, Primary Beneficiary [Member]
Current assets		21,057		21,057		18,304
Non-current assets		7,764		7,764		7,635
Current liabilities		9,721		9,721		8,261
Non-current liabilities		1,557		1,557		$ 1,962
Revenue		8,677	7,275	22,132	20,719
Gross profit		3,354	2,412	7,735	6,463
Net income (loss) attributable to Aegion Corporation		$ 534	$ (2,154)	$ 889	$ (2,773)
[1]	Revenues and gross profit are attributed to the country of origin

Note 3 - Revenues 1 (Details Te

Note 3 - Revenues 1 (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Disposal Group, Including Discontinued Operation, Contract Assets, Current	$ 0.9		$ 0.9		$ 5.4
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current	0.1		0.1		0.1
Contract with Customer, Liability, Total					$ 37.6	$ 32.3
Construction, Engineering and Installation Services [Member]
Revenue, Remaining Performance Obligation, Amount	$ 491		$ 491
Product and Services [Member]
Revenue Recognized, Percent	89.20%	92.60%	90.10%	92.40%
Product [Member]
Revenue Recognized, Percent	10.80%	7.40%	9.90%	7.60%

Note 3 - Revenues 2 (Details Te

Note 3 - Revenues 2 (Details Textual) - Construction, Engineering and Installation Services [Member] $ in Millions	Sep. 30, 2020USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 491
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Amount	$ 482.4
Revenue, Remaining Performance Obligation, Percentage	98.20%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	12 months

Note 3 - Revenues - Disaggregat

Note 3 - Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	[1]	$ 275,884	$ 308,789	$ 808,276	$ 904,433
Fixed-price Contract [Member]
Revenues		175,500	194,070	494,986	547,035
Time-and-materials Contract [Member]
Revenues		70,489	91,890	233,548	288,506
Product Sales [Member]
Revenues		29,847	22,780	79,694	68,649
License Fees [Member]
Revenues		48	49	48	243
Infrastructure Solutions [Member]
Revenues		152,102	156,087	419,738	443,069
Infrastructure Solutions [Member] | Fixed-price Contract [Member]
Revenues		130,685	139,363	364,591	394,489
Infrastructure Solutions [Member] | Time-and-materials Contract [Member]
Revenues		0	0	0	0
Infrastructure Solutions [Member] | Product Sales [Member]
Revenues		21,369	16,675	55,099	48,337
Infrastructure Solutions [Member] | License Fees [Member]
Revenues		48	49	48	243
Corrosion Protection [Member]
Revenues		60,986	75,901	182,545	217,996
Corrosion Protection [Member] | Fixed-price Contract [Member]
Revenues		43,812	53,704	126,449	149,333
Corrosion Protection [Member] | Time-and-materials Contract [Member]
Revenues		8,696	16,092	31,501	48,351
Corrosion Protection [Member] | Product Sales [Member]
Revenues		8,478	6,105	24,595	20,312
Corrosion Protection [Member] | License Fees [Member]
Revenues		0	0	0	0
Energy Services [Member]
Revenues		62,796	76,801	205,993	243,368
Energy Services [Member] | Fixed-price Contract [Member]
Revenues		1,003	1,003	3,946	3,213
Energy Services [Member] | Time-and-materials Contract [Member]
Revenues		61,793	75,798	202,047	240,155
Energy Services [Member] | Product Sales [Member]
Revenues		0	0	0	0
Energy Services [Member] | License Fees [Member]
Revenues		0	0	0	0
UNITED STATES
Revenues	[1]	212,407	231,904	643,074	680,666
UNITED STATES | Infrastructure Solutions [Member]
Revenues		119,334	112,357	337,457	321,205
UNITED STATES | Corrosion Protection [Member]
Revenues		30,277	42,746	99,624	116,093
UNITED STATES | Energy Services [Member]
Revenues		62,796	76,801	205,993	243,368
CANADA
Revenues	[1]	34,325	32,124	81,175	89,584
CANADA | Infrastructure Solutions [Member]
Revenues		20,864	17,775	46,092	47,320
CANADA | Corrosion Protection [Member]
Revenues		13,461	14,349	35,083	42,264
CANADA | Energy Services [Member]
Revenues		0	0	0	0
Europe [Member]
Revenues	[1]	9,957	16,347	27,820	49,731
Europe [Member] | Infrastructure Solutions [Member]
Revenues		5,727	12,889	17,500	38,302
Europe [Member] | Corrosion Protection [Member]
Revenues		4,230	3,458	10,320	11,429
Europe [Member] | Energy Services [Member]
Revenues		0	0	0	0
Other Foreign Countries [Member]
Revenues	[1]	19,195	28,414	56,207	84,452
Other Foreign Countries [Member] | Infrastructure Solutions [Member]
Revenues		6,177	13,066	18,689	36,242
Other Foreign Countries [Member] | Corrosion Protection [Member]
Revenues		13,018	15,348	37,518	48,210
Other Foreign Countries [Member] | Energy Services [Member]
Revenues		$ 0	$ 0	$ 0	$ 0
[1]	Revenues and gross profit are attributed to the country of origin

Note 3 - Revenues- Contract Ass

Note 3 - Revenues- Contract Assets (Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	[1]	Dec. 31, 2019	[2]
Contract assets – current	$ 51,150		$ 51,092
Contract liabilities – current	(37,034)		(37,562)
Net contract assets	$ 14,116		$ 13,530
[1]	Amounts exclude contract assets of $0.9 million and contract liabilities of less than $0.1 million that were classified as held for sale at September 30, 2020 (see Note 5).
[2]	Amounts exclude contract assets of $5.4 million and contract liabilities of $0.1 million that were classified as held for sale at December 31, 2019 (see Note 5).

Note 4 - Restructuring (Details

Note 4 - Restructuring (Details Textual) $ in Thousands	3 Months Ended			9 Months Ended				12 Months Ended		38 Months Ended
	Sep. 30, 2020USD ($)	Dec. 31, 2019	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)		Sep. 30, 2019USD ($)		Dec. 31, 2019	Dec. 31, 2017USD ($)	Sep. 30, 2020USD ($)
Expected Restructuring Cash Charges Related to COVID-19	$ 2,000			$ 2,000						$ 2,000
Restructuring Charges, Non-Cash				1,067		$ 6,419
Restructuring 2017 [Member]
Restructuring Charges Pre Tax										184,700
Restructuring Charges, Net of Tax										166,000
Payments for Restructuring				13,955	[1]	9,739	[2]			54,800
Restructuring Reserve, Settled without Cash										$ 129,900
Restructuring and Related Cost, Number of Positions Eliminated										804
Restructuring Charges, Cash	3,700		$ 3,100	9,500		11,600
Restructuring Charges, Non-Cash	500		5,500	3,200		6,400
Downsize Operation in US [Member]
Restructuring and Related Cost, Number of Office Closed		3
Restructuring and Related Cost, Number of Offices Exiting Capital Intensive Drilling Activities		4
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent								20.00%
Restructuring and Related Cost, Contributed To Cathodic Protection Domestic Revenue, Percentage								20.00%
Restructuring Charges Related to Goodwill and Long-lived Asset Impairment Charges [Member] | Restructuring 2017 [Member]
Restructuring Reserve, Settled without Cash									$ 86,400
Allowance, Write-offs and Long-lived Assets, Impairment of Intangible Assets and Net Losses On Disposal of Entities [Member] | Restructuring 2017 [Member]
Restructuring Reserve, Settled without Cash									$ 43,500
Severance, Other Termination Benefit Costs and Contract Termination Costs [Member] | Restructuring 2017 [Member]
Restructuring and Related Costs, Incurred Cost, Total	$ 2,300		$ 1,400	$ 4,300		$ 5,500
[1]	Refers to cash utilized to settle charges during the first nine months of 2020.
[2]	Refers to cash utilized to settle charges during the first nine months of 2019.

Note 4 - Restructuring - Pre Ta

Note 4 - Restructuring - Pre Tax Restructuring Cost (Details) - Restructuring 2017 [Member] - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020		Sep. 30, 2019
Restructuring charges	$ 4,243	[1]	$ 8,607	[2]	$ 12,699	[3]	$ 17,989	[4]
Cost of Revenues [Member]
Restructuring charges	1,830	[1]	(33)	[2]	2,074	[3]	437	[4]
Operating Expense [Member]
Restructuring charges	1,546	[1]	1,860	[2]	5,893	[3]	5,595	[4]
Restructuring and Related Charges [Member]
Restructuring charges	2,335	[1]	1,435	[2]	4,287	[3]	5,495	[4]
Goodwill Impairment [Member]
Restructuring charges					1,258	[3]	0	[4]
Other Expense [Member]
Restructuring charges	(1,468)	[1]	5,345	[2]	(1,770)	[3]	6,462	[4]
Definite-lived Intangible Asset Impairment [Member]
Restructuring charges					957	[3]	0	[4]
Employee Severance [Member]
Restructuring charges	2,038		1,147		3,526		3,774
Contract Termination [Member]
Restructuring charges	274		209		601		1,447
Employee Relocation [Member]
Restructuring charges	23		79		160		274
Other Restructuring [Member]
Restructuring charges	1,908	[5]	7,172	[5]	8,412	[6]	12,494	[6]
Operating Segments [Member] | Infrastructure Solutions [Member]
Restructuring charges	(1,475)		5,904		(1,159)		10,561
Operating Segments [Member] | Infrastructure Solutions [Member] | Cost of Revenues [Member]
Restructuring charges	0		(30)		69		(122)
Operating Segments [Member] | Infrastructure Solutions [Member] | Operating Expense [Member]
Restructuring charges	(87)		748		229		3,070
Operating Segments [Member] | Infrastructure Solutions [Member] | Restructuring and Related Charges [Member]
Restructuring charges	(89)		490		65		1,707
Operating Segments [Member] | Infrastructure Solutions [Member] | Goodwill Impairment [Member]
Restructuring charges					0		0
Operating Segments [Member] | Infrastructure Solutions [Member] | Other Expense [Member]
Restructuring charges	(1,299)		4,696		(1,522)		5,906
Operating Segments [Member] | Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges					0		0
Operating Segments [Member] | Infrastructure Solutions [Member] | Employee Severance [Member]
Restructuring charges	(89)		210		29		1,043
Operating Segments [Member] | Infrastructure Solutions [Member] | Contract Termination [Member]
Restructuring charges	0		201		36		534
Operating Segments [Member] | Infrastructure Solutions [Member] | Employee Relocation [Member]
Restructuring charges	0		79		0		130
Operating Segments [Member] | Infrastructure Solutions [Member] | Other Restructuring [Member]
Restructuring charges	(1,386)	[5]	5,414	[5]	(1,224)	[6]	8,854	[6]
Operating Segments [Member] | Corrosion Protection [Member]
Restructuring charges	4,488		918		6,868		4,343
Operating Segments [Member] | Corrosion Protection [Member] | Cost of Revenues [Member]
Restructuring charges	1,830		(3)		2,005		559
Operating Segments [Member] | Corrosion Protection [Member] | Operating Expense [Member]
Restructuring charges	527		315		2,169		583
Operating Segments [Member] | Corrosion Protection [Member] | Restructuring and Related Charges [Member]
Restructuring charges	2,163		455		3,464		3,151
Operating Segments [Member] | Corrosion Protection [Member] | Goodwill Impairment [Member]
Restructuring charges					0		0
Operating Segments [Member] | Corrosion Protection [Member] | Other Expense [Member]
Restructuring charges	(32)		151		(770)		50
Operating Segments [Member] | Corrosion Protection [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges					0		0
Operating Segments [Member] | Corrosion Protection [Member] | Employee Severance [Member]
Restructuring charges	1,952		447		2,921		2,192
Operating Segments [Member] | Corrosion Protection [Member] | Contract Termination [Member]
Restructuring charges	188		8		417		815
Operating Segments [Member] | Corrosion Protection [Member] | Employee Relocation [Member]
Restructuring charges	23		0		126		144
Operating Segments [Member] | Corrosion Protection [Member] | Other Restructuring [Member]
Restructuring charges	2,325	[5]	463	[5]	3,404	[6]	1,192	[6]
Operating Segments [Member] | Energy Services [Member]
Restructuring charges	869		139		4,419		179
Operating Segments [Member] | Energy Services [Member] | Cost of Revenues [Member]
Restructuring charges	0		0		0		0
Operating Segments [Member] | Energy Services [Member] | Operating Expense [Member]
Restructuring charges	611		65		1,781		65
Operating Segments [Member] | Energy Services [Member] | Restructuring and Related Charges [Member]
Restructuring charges	258		74		423		114
Operating Segments [Member] | Energy Services [Member] | Goodwill Impairment [Member]
Restructuring charges					1,258		0
Operating Segments [Member] | Energy Services [Member] | Other Expense [Member]
Restructuring charges	0		0		0		0
Operating Segments [Member] | Energy Services [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges					957		0
Operating Segments [Member] | Energy Services [Member] | Employee Severance [Member]
Restructuring charges	172		74		241		114
Operating Segments [Member] | Energy Services [Member] | Contract Termination [Member]
Restructuring charges	86		0		148		0
Operating Segments [Member] | Energy Services [Member] | Employee Relocation [Member]
Restructuring charges	0		0		34		0
Operating Segments [Member] | Energy Services [Member] | Other Restructuring [Member]
Restructuring charges	611	[5]	65	[5]	3,996	[6]	65	[6]
Corporate, Non-Segment [Member]
Restructuring charges	361		1,646		2,571		2,906
Corporate, Non-Segment [Member] | Cost of Revenues [Member]
Restructuring charges	0		0		0		0
Corporate, Non-Segment [Member] | Operating Expense [Member]
Restructuring charges	495		732		1,714		1,877
Corporate, Non-Segment [Member] | Restructuring and Related Charges [Member]
Restructuring charges	3		416		335		523
Corporate, Non-Segment [Member] | Goodwill Impairment [Member]
Restructuring charges					0		0
Corporate, Non-Segment [Member] | Other Expense [Member]
Restructuring charges	(137)		498		522		506
Corporate, Non-Segment [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges					0		0
Corporate, Non-Segment [Member] | Employee Severance [Member]
Restructuring charges	3		416		335		425
Corporate, Non-Segment [Member] | Contract Termination [Member]
Restructuring charges	0		0		0		98
Corporate, Non-Segment [Member] | Employee Relocation [Member]
Restructuring charges	0		0		0		0
Corporate, Non-Segment [Member] | Other Restructuring [Member]
Restructuring charges	$ 358	[5]	$ 1,230	[5]	$ 2,236	[6]	$ 2,383	[6]
[1]	Total pre-tax restructuring charges for the quarter ended September 30, 2020 include cash charges of $3.7 million and non-cash charges of $0.5 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[2]	Total pre-tax restructuring charges for the quarter ended September 30, 2019 include cash charges of $3.1 million and non-cash charges of $5.5 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[3]	Total pre-tax restructuring charges for the nine months ended September 30, 2020 include cash charges of $9.5 million and non-cash charges of $3.2 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[4]	Total pre-tax restructuring charges for the nine months ended September 30, 2019 include cash charges of $11.6 million and non-cash charges of $6.4 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[5]	For the quarter ended September 30, 2020, charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals, release of cumulative currency translation adjustments and other restructuring-related costs in connection with optimizing the cathodic protection operations in North America, disposing of certain international businesses and other cost savings initiatives. For the quarter ended September 30, 2019, charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals, and other restructuring-related costs in connection with exiting the CIPP operations in Europe, exiting the cathodic protection operations in the Middle East and other cost savings initiatives.
[6]	For the nine months ended September 30, 2020, charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals, release of cumulative currency translation adjustments and other restructuring-related costs in connection with optimizing the cathodic protection operations in North America, exiting the CIPP operations in Europe, disposing of certain international businesses and other cost savings initiatives. Amounts also include goodwill and definite-lived intangible asset impairments related to the exiting P2S. For the nine months ended September 30, 2019, charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals and other restructuring-related costs in connection with exiting the CIPP operations in Europe, exiting the cathodic protection operations in the Middle East and other cost savings initiatives.

Note 4 - Restructuring - Recogn

Note 4 - Restructuring - Recognized Cost Restructuring Activities (Details) - Restructuring 2017 [Member] - USD ($) $ in Thousands	3 Months Ended				9 Months Ended				38 Months Ended
	Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020
Restructuring reserve, balance					$ 8,088		$ 2,412
Restructuring charges	$ 4,243	[1]	$ 8,607	[2]	12,699	[3]	17,989	[4]
Restructuring reserve, foreign currency translation					(36)		(69)
Restructuring reserve, settled with cash					13,955	[5]	9,739	[6]	$ 54,800
Restructuring reserve, settled without cash					3,282		6,419
Restructuring reserve, balance	3,514		4,174		3,514		4,174		3,514
Employee Severance [Member]
Restructuring reserve, balance					4,389		1,742
Restructuring charges	2,038		1,147		3,526		3,774
Restructuring reserve, foreign currency translation					(18)		(26)
Restructuring reserve, settled with cash					6,567	[5]	2,434	[6]
Restructuring reserve, settled without cash					0		0
Restructuring reserve, balance	1,330		3,056		1,330		3,056		1,330
Contract Termination [Member]
Restructuring reserve, balance					953		359
Restructuring charges	274		209		601		1,447
Restructuring reserve, foreign currency translation					(7)		(30)
Restructuring reserve, settled with cash					961	[5]	1,153	[6]
Restructuring reserve, settled without cash					0		0
Restructuring reserve, balance	586		623		586		623		586
Employee Relocation [Member]
Restructuring reserve, balance					367		0
Restructuring charges	23		79		160		274
Restructuring reserve, foreign currency translation					1		(4)
Restructuring reserve, settled with cash					288	[5]	198	[6]
Restructuring reserve, settled without cash					0		0
Restructuring reserve, balance	240		72		240		72		240
Other Restructuring [Member]
Restructuring reserve, balance					2,379		311
Restructuring charges	1,908	[7]	7,172	[7]	8,412	[8]	12,494	[8]
Restructuring reserve, foreign currency translation					(12)		(9)
Restructuring reserve, settled with cash					6,139	[5]	5,954	[6]
Restructuring reserve, settled without cash					3,282		6,419
Restructuring reserve, balance	$ 1,358		$ 423		$ 1,358		$ 423		$ 1,358
[1]	Total pre-tax restructuring charges for the quarter ended September 30, 2020 include cash charges of $3.7 million and non-cash charges of $0.5 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[2]	Total pre-tax restructuring charges for the quarter ended September 30, 2019 include cash charges of $3.1 million and non-cash charges of $5.5 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[3]	Total pre-tax restructuring charges for the nine months ended September 30, 2020 include cash charges of $9.5 million and non-cash charges of $3.2 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[4]	Total pre-tax restructuring charges for the nine months ended September 30, 2019 include cash charges of $11.6 million and non-cash charges of $6.4 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[5]	Refers to cash utilized to settle charges during the first nine months of 2020.
[6]	Refers to cash utilized to settle charges during the first nine months of 2019.
[7]	For the quarter ended September 30, 2020, charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals, release of cumulative currency translation adjustments and other restructuring-related costs in connection with optimizing the cathodic protection operations in North America, disposing of certain international businesses and other cost savings initiatives. For the quarter ended September 30, 2019, charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals, and other restructuring-related costs in connection with exiting the CIPP operations in Europe, exiting the cathodic protection operations in the Middle East and other cost savings initiatives.
[8]	For the nine months ended September 30, 2020, charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals, release of cumulative currency translation adjustments and other restructuring-related costs in connection with optimizing the cathodic protection operations in North America, exiting the CIPP operations in Europe, disposing of certain international businesses and other cost savings initiatives. Amounts also include goodwill and definite-lived intangible asset impairments related to the exiting P2S. For the nine months ended September 30, 2019, charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals and other restructuring-related costs in connection with exiting the CIPP operations in Europe, exiting the cathodic protection operations in the Middle East and other cost savings initiatives.

Note 5 - Assets and Liabiliti_3

Note 5 - Assets and Liabilities Held for Sale (Details Textual) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Impairment of Long-Lived Assets to be Disposed of	$ 0	$ 11,946
Corporate, Non-Segment [Member]
Impairment of Long-Lived Assets to be Disposed of			$ 2,900

Note 5 - Assets and Liabiliti_4

Note 5 - Assets and Liabilities Held for Sale - Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	9 Months Ended			12 Months Ended
	Sep. 30, 2020		Sep. 30, 2019	Dec. 31, 2019
Disposal Group, Including Discontinued Operation, Contract Assets, Current	$ 900			$ 5,400
Total current assets	11,083			16,092
Impairment of assets held for sale	0		$ (11,946)
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current	100			100
Total current liabilities	1,864			6,485
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Receivables, net	423	[1]		4,136	[2]
Retainage	483	[1]		518	[2]
Disposal Group, Including Discontinued Operation, Contract Assets, Current	882	[1]		5,350	[2]
Inventories	123	[1]		2,097	[2]
Prepaid expenses and other current assets	261	[1]		799	[2]
Total current assets	2,172	[1]		12,900	[2]
Property, plant & equipment, less accumulated depreciation	7,357	[1]		10,962	[2]
Goodwill	2,640	[1]		4,224	[2]
Intangible assets, less accumulated amortization	1,492	[1]		1,528	[2]
Operating lease assets	156	[1]		326	[2]
Other non-current assets	127	[1]		130	[2]
Impairment of assets held for sale	(2,861)	[1]		(13,978)	[2]
Total assets held for sale	11,083	[1]		16,092	[2]
Accounts payable	362	[1]		2,174	[2]
Accrued expenses	1,306	[1]		3,961	[2]
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current	44	[1]		122	[2]
Total current liabilities	1,712	[1]		6,257	[2]
Operating lease liabilities	97	[1]		174	[2]
Other non-current liabilities	55	[1]		54	[2]
Total liabilities held for sale	$ 1,864	[1]		$ 6,485	[2]
[1]	Includes Environmental Techniques and land held at Corporate.
[2]	Includes Insituform Australia, Insituform Spain, Environmental Techniques and land held at Corporate.

Note 6 - Leases (Details Textua

Note 6 - Leases (Details Textual) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Lessee, Operating Lease, Renewal Term (Year)	5 years
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Operating Lease, Right-of-Use Asset 1	$ 0.2	$ 0.3
Disposal Group, Including Discontinued Operation, Accrued Expense	0.1	0.2
Disposal Group, Including Discontinued Operation, Other Liabilities	$ 0.1	$ 0.2
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	20 years

Note 6 - Leases - Lease Expense

Note 6 - Leases - Lease Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating lease cost	$ 4,912	$ 5,501	$ 15,050	$ 16,891
Short-term lease cost	5,422	8,125	16,288	20,846
Total lease cost	$ 10,334	$ 13,626	$ 31,338	$ 37,737

Note 6 - Leases - Supplement Fi

Note 6 - Leases - Supplement Financial Statement Disclosure (Details) - USD ($) $ in Thousands	Sep. 30, 2020		Dec. 31, 2019
Operating lease assets	$ 67,504	[1]	$ 71,466	[2]
Other liabilities	$ 52,418		$ 56,253
Weighted-average remaining lease term (Year)	5 years 7 months 2 days	[1]	5 years 8 months 26 days	[2]
Weighted-average discount rate	4.86%	[1]	5.71%	[2]
Accrued Expense [Member]
Accrued expenses	$ 16,490	[1]	$ 15,828	[2]
Other Liabilities [Member]
Other liabilities	52,418	[1]	56,253	[2]
Accrued Expense and Other Liabilities [Member]
Total operating lease liabilities	$ 68,908	[1]	$ 72,081	[2]
[1]	Amounts exclude operating lease assets of $0.2 million, accrued expenses of less than $0.1 and other liabilities of less than $0.1 million that were classified as held for sale at September 30, 2020 (see Note 5).
[2]	Amounts exclude operating lease assets of $0.3 million, accrued expenses of $0.2 million and other liabilities of $0.2 million that were classified as held for sale at December 31, 2019 (see Note 5).

Note 7 - Goodwill and Intangi_3

Note 7 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Goodwill, Impairment Loss	$ 39,430		$ 0	$ 40,688	[1],[2]	$ 0
Impairment of Intangible Assets, Finite-lived	0		0	957		0
Amortization of Intangible Assets, Total	3,400		$ 3,400	10,200		$ 10,300
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year	13,000			13,000
Finite-Lived Intangible Asset, Expected Amortization, Year One	12,900			12,900
Finite-Lived Intangible Asset, Expected Amortization, Year Two	12,900			12,900
Finite-Lived Intangible Asset, Expected Amortization, Year Three	12,900			12,900
Finite-Lived Intangible Asset, Expected Amortization, Year Four	12,100			12,100
Energy Services [Member]
Goodwill, Impairment Loss	$ 39,400	$ 1,300		40,688	[1],[2]
Impairment of Intangible Assets, Finite-lived				$ 1,000
Energy Services [Member] | Trademarks [Member]
Impairment of Intangible Assets, Finite-lived		300
Energy Services [Member] | Customer Relationships [Member]
Impairment of Intangible Assets, Finite-lived		$ 700
[1]	During the second quarter of 2020, the Company recorded a $1.3 million goodwill impairment related to restructuring activities within Energy Services (see Note 4).
[2]	During the third quarter of 2020, the Company recorded a $39.4 million goodwill impairment within Energy Services (see Note 2).

Note 7 - Goodwill and Intangi_4

Note 7 - Goodwill and Intangible Assets - Reconciliation Goodwill (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019	Dec. 31, 2019
Goodwill, gross		$ 398,803			$ 398,803			$ 398,610
Accumulated impairment losses		(182,463)			(182,463)			(141,775)
Goodwill, Ending Balance		216,340			216,340			256,835
Impairments (1)(2)		(39,430)		$ 0	(40,688)	[1],[2]	$ 0
Foreign currency translation					193
Infrastructure Solutions [Member]
Goodwill, gross		240,594			240,594			240,160
Accumulated impairment losses		(62,848)			(62,848)			(62,848)
Goodwill, Ending Balance		177,746			177,746			177,312
Impairments (1)(2)	[1],[2]				0
Foreign currency translation					434
Corrosion Protection [Member]
Goodwill, gross		76,705			76,705			76,946
Accumulated impairment losses		(45,400)			(45,400)			(45,400)
Goodwill, Ending Balance		31,305			31,305			31,546
Impairments (1)(2)	[1],[2]				0
Foreign currency translation					(241)
Energy Services [Member]
Goodwill, gross		81,504			81,504			81,504
Accumulated impairment losses		(74,215)			(74,215)			(33,527)
Goodwill, Ending Balance		7,289			7,289			$ 47,977
Impairments (1)(2)		$ (39,400)	$ (1,300)		(40,688)	[1],[2]
Foreign currency translation					$ 0
[1]	During the second quarter of 2020, the Company recorded a $1.3 million goodwill impairment related to restructuring activities within Energy Services (see Note 4).
[2]	During the third quarter of 2020, the Company recorded a $39.4 million goodwill impairment within Energy Services (see Note 2).

Note 7 - Goodwill and Intangi_5

Note 7 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020	Dec. 31, 2019
Gross carrying amount		$ 218,339	$ 219,623
Accumulated amortization		(124,394)	(114,795)
Net carrying amount		$ 93,945	104,828
Licensing Agreements [Member]
Weighted average useful lives (Year)		0 years
Gross carrying amount		$ 3,894	3,894
Accumulated amortization		(3,894)	(3,824)
Net carrying amount		$ 0	70
Lease Agreements [Member]
Weighted average useful lives (Year)		3 months 18 days
Gross carrying amount		$ 864	864
Accumulated amortization		(842)	(777)
Net carrying amount		$ 22	87
Trademarks [Member]
Weighted average useful lives (Year)	[1]	5 years 7 months 6 days
Gross carrying amount	[1]	$ 15,466	15,699
Accumulated amortization	[1]	(7,462)	(6,911)
Net carrying amount	[1]	$ 8,004	8,788
Noncompete Agreements [Member]
Weighted average useful lives (Year)		6 months
Gross carrying amount		$ 2,051	2,301
Accumulated amortization		(1,448)	(1,354)
Net carrying amount		$ 604	947
Customer Relationships [Member]
Weighted average useful lives (Year)	[1]	6 years 3 months 18 days
Gross carrying amount	[1]	$ 156,897	157,576
Accumulated amortization	[1]	(84,574)	(76,832)
Net carrying amount	[1]	$ 72,323	80,744
Patents [Member]
Weighted average useful lives (Year)		5 years 10 months 24 days
Gross carrying amount		$ 39,167	39,289
Accumulated amortization		(26,174)	(25,097)
Net carrying amount		$ 12,993	$ 14,192
[1]	During the second quarter of 2020, the Company recorded intangible asset impairments related to restructuring activities within Energy Services of $0.3 million for trademarks and $0.7 million for customer relationships (see Note 4).

Note 8 - Long-term Debt and C_3

Note 8 - Long-term Debt and Credit Facility (Details Textual) - USD ($) $ in Thousands	Apr. 29, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2021	Feb. 28, 2023	Dec. 31, 2019	Mar. 12, 2018	Oct. 31, 2015
Long-term Debt, Total		$ 228,192	$ 228,192				$ 278,520
Payments of Financing Costs, Total			1,995	$ 0
Long-term Debt, Fair Value		230,400	230,400				286,800
Derivative, Fixed Interest Rate								2.937%
A 2015 Interest Rate Swap [Member]
Derivative Asset, Notional Amount									$ 262,500
Derivative, Fixed Interest Rate									1.46%
A 2018 Interest Rate Swap [Member]
Derivative Asset, Notional Amount								$ 170,600
Derivative, Fixed Interest Rate								2.937%
Derivative, Amount of Hedged Item								$ 170,600
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Term Loan [Member]
Long-term Debt, Total		227,500	227,500				253,800
A 2015 Credit Facility [Member]
Debt Instrument, Face Amount									$ 650,000
Line of Credit Facility, Maximum Borrowing Capacity									350,000
Other Loans Payable, Total		700	700				800
Letters of Credit Outstanding, Amount		$ 31,600	$ 31,600
Long-term Line of Credit, Total							$ 24,000
Derivative, Amount of Hedged Item									$ 262,500
Credit Facility Maximum Consolidated Leverage Ratio		4.75	4.75
Credit Facility Actual Consolidated Leverage Ratio		2.31	2.31
Line of Credit Facility, Current Borrowing Capacity		$ 143,400	$ 143,400
Credit Facility Minimum Consolidated Fixed Charge Ratio		1.10	1.10
A 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Interest Rate, Effective Percentage		4.25%	4.25%
A 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Forecast [Member]
Debt Instrument, Basis Spread on Variable Rate					3.50%
A 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Forecast [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate						1.75%
A 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Forecast [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate						3.50%
A 2015 Credit Facility [Member] | Term Loan [Member]
Long-term Debt, Total		$ 245,000	$ 245,000
Debt Instrument, Interest Rate, Effective Percentage		5.23%	5.23%
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 175,000	$ 175,000
Payments of Financing Costs, Total		2,000
Line Of Credit Facility, Unamortized Loan Costs		1,900
Interest Expense, Debt, Total		200
Repayments of Long-term Lines of Credit			24,000
Line of Credit Facility, Remaining Borrowing Capacity		251,700	251,700
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member] | Up-front Lending Fees [Member]
Payments of Financing Costs, Total		1,500
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member] | Third-party Arranging Fees and Expenses [Member]
Payments of Financing Costs, Total		500
A 2015 Credit Facility [Member] | Insurance Carries Collateral [Member]
Letters of Credit Outstanding, Amount		11,200	11,200
A 2015 Credit Facility [Member] | Working Performance Obligation [Member]
Letters of Credit Outstanding, Amount		$ 20,400	$ 20,400

Note 8 - Long-term Debt and C_4

Note 8 - Long-term Debt and Credit Facility - Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long term debt	$ 228,192	$ 278,520
Less – Current maturities of long-term debt	23,825	32,803
Less – Unamortized loan costs	2,767	2,088
Total	201,600	243,629
Medium-term Notes [Member]
Long term debt	227,500	253,750
Line of Credit [Member]
Long term debt	0	24,000
Notes Payable, Other Payables [Member]
Long term debt	$ 692	$ 770

Note 9 - Stockholders' Equity_3

Note 9 - Stockholders' Equity and Equity Compensation (Details Textual) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020USD ($)shares	Sep. 30, 2019USD ($)	Mar. 31, 2019$ / sharesshares	Sep. 30, 2020USD ($)$ / sharesshares	Sep. 30, 2019USD ($)$ / sharesshares	Jun. 30, 2020USD ($)	Apr. 29, 2020USD ($)	Dec. 31, 2019shares	Apr. 30, 2019shares	Dec. 31, 2018shares	Apr. 30, 2018shares
Stock Repurchase Program, Authorized Amount | $							$ 5
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Year)				1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)			52,783
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares			$ 18.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	0			0				0
A 2016 Employee Plan [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)											1,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	1,355,403			1,355,403
A 2016 Director Plan [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)									300,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	254,350			254,350
Share-based Payment Arrangement, Option [Member]
Stock Repurchased During Period, Shares (in shares)					48,409
Stock Repurchased During Period, Value | $					$ 1
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares					$ 20.52
Current Stock Awards [Member]
Share-based Payment Arrangement, Expense | $	$ 3.4	$ 1.5		$ 7.4	$ 5.5
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $	12.7			$ 12.7
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 11 months 15 days
Deferred Stock Units [Member]
Share-based Payment Arrangement, Expense | $	0.3	$ 0.3		$ 0.7	$ 0.3
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $	$ 0.5			$ 0.5
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				7 months 6 days
Maximum [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				10 years
Minimum [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				7 years
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Credit Facility Consolidated Leverage Ratio for Unlimited Share Repurchases							2.50
Credit Facility Consolidated Leverage Ratio for 20 Million Share Repurchases							3
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Credit Facility Consolidated Leverage Ratio for 20 Million Share Repurchases							2.50
Credit Facility Consolidated Leverage Ratio for Zero Share Repurchases							3
The 2019 Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)								2,000,000
The 2018 Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)										2,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)	327,161			327,161
In Connection With Equity Compensation Programs [Member]
Stock Repurchase Program, Authorized Amount | $						$ 10
Stock Repurchased During Period, Shares (in shares)				93,386	110,406
Stock Repurchased During Period, Value | $				$ 2	$ 2.2
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares				$ 21.83	$ 20.21
Through The Open Market Repurchase Program [Member]
Stock Repurchased During Period, Shares (in shares)				180,491	1,426,916
Stock Repurchased During Period, Value | $				$ 3.2	$ 24.9
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares				$ 17.80	$ 17.46

Note 9 - Stockholders' Equity_4

Note 9 - Stockholders' Equity and Equity Compensation - Summary of Stock Award Activity (Details)	9 Months Ended
	Sep. 30, 2020$ / sharesshares
Stock Awards, Outstanding (in shares) | shares	1,034,964
Weighted average award date fair value (in dollars per share) | $ / shares	$ 23.20
Stock Awards, Outstanding (in shares) | shares	1,192,619
Weighted average award date fair value (in dollars per share) | $ / shares	$ 21.70
Restricted Stock Units (RSUs) [Member]
Awards, grants during period (in shares) | shares	405,453
Weighted average award date fair value, award granted (in dollars per share) | $ / shares	$ 19.89
Awards, distributed during period (in shares) | shares	(198,433)
Weighted average award date fair value, award distributed (in dollars per share) | $ / shares	$ 22.24
Awards, forfeited during period (in shares) | shares	(33,297)
Weighted average award date fair value, award forfeited (in dollars per share) | $ / shares	$ 21.01
Performance Shares [Member]
Awards, grants during period (in shares) | shares	131,755
Weighted average award date fair value, award granted (in dollars per share) | $ / shares	$ 22.96
Awards, distributed during period (in shares) | shares	(71,541)
Weighted average award date fair value, award distributed (in dollars per share) | $ / shares	$ 28.18
Awards, forfeited during period (in shares) | shares	(76,282)
Weighted average award date fair value, award forfeited (in dollars per share) | $ / shares	$ 27.46

Note 9 - Stockholders' Equity_5

Note 9 - Stockholders' Equity and Equity Compensation - Deferred Stock Unit Activity (Details)	9 Months Ended
	Sep. 30, 2020$ / sharesshares
Stock Awards, Outstanding (in shares) | shares	1,034,964
Weighted average award date fair value (in dollars per share) | $ / shares	$ 23.20
Stock Awards, Outstanding (in shares) | shares	1,192,619
Weighted average award date fair value (in dollars per share) | $ / shares	$ 21.70
Deferred Stock Units [Member]
Stock Awards, Outstanding (in shares) | shares	253,340
Weighted average award date fair value (in dollars per share) | $ / shares	$ 20.71
Awards, grants during period (in shares) | shares	67,056
Weighted average award date fair value, award granted (in dollars per share) | $ / shares	$ 14.61
Awards, distributed during period (in shares) | shares	(58,267)
Weighted average award date fair value, award distributed (in dollars per share) | $ / shares	$ 21.63
Stock Awards, Outstanding (in shares) | shares	262,129
Weighted average award date fair value (in dollars per share) | $ / shares	$ 18.95

Note 10 - Taxes on Income (Deta

Note 10 - Taxes on Income (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Effective Income Tax Rate Reconciliation, Percent, Total	10.10%	1.80%	6.50%	(143.30%)
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount		$ 1.7		$ 1.7
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent		27.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount				$ 2.1

Note 12 - Segment Reporting (De

Note 12 - Segment Reporting (Details Textual) $ in Thousands		3 Months Ended					9 Months Ended
		Sep. 30, 2020USD ($)		Jun. 30, 2020USD ($)	Sep. 30, 2019USD ($)		Sep. 30, 2020USD ($)		Sep. 30, 2019USD ($)
Number of Reportable Segments							3
Impairment of Long-Lived Assets to be Disposed of							$ 0		$ 11,946
Goodwill, Impairment Loss		$ 39,430			$ 0		40,688	[1],[2]	0
Impairment of Intangible Assets, Finite-lived		0			0		957		0
Infrastructure Solutions [Member]
Impairment of Long-Lived Assets to be Disposed of							700		9,000
Goodwill, Impairment Loss	[1],[2]						0
Corrosion Protection [Member]
Impairment of Long-Lived Assets to be Disposed of									2,900
Goodwill, Impairment Loss	[1],[2]						0
Energy Services [Member]
Goodwill, Impairment Loss		39,400		$ 1,300			40,688	[1],[2]
Impairment of Intangible Assets, Finite-lived							1,000
Other Nonoperating Income (Expense) [Member] | Insituform Australia and Insituform Spain [Member]
Gain (Loss) on Disposition of Business							100
Restructuring 2017 [Member]
Restructuring Charges, Total		4,243	[3]		8,607	[4]	12,699	[5]	17,989	[6]
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Infrastructure Solutions [Member]
Restructuring Charges, Total		200			1,200		400		4,700
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Infrastructure Solutions [Member] | Divestiture of International Operations [Member]
Restructuring Charges, Total					500		200		1,000
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corrosion Protection [Member]
Restructuring Charges, Total		4,500			800		7,600		4,300
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Energy Services [Member]
Restructuring Charges, Total		900			100		2,200		200
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corporate Segment [Member]
Restructuring Charges, Total		500			1,100		2,000		2,400
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corporate Segment [Member] | Divestiture of International Operations [Member]
Restructuring Charges, Total		700			1,300		2,000		1,600
Restructuring 2017 [Member] | Other Nonoperating Income (Expense) [Member]
Restructuring Charges, Total		1,500			$ 5,300		$ 1,800		$ 6,500
Restructuring 2017 [Member] | Other Nonoperating Income (Expense) [Member] | Divestiture of International Operations [Member]
Restructuring Charges, Total		$ 600
[1]	During the second quarter of 2020, the Company recorded a $1.3 million goodwill impairment related to restructuring activities within Energy Services (see Note 4).
[2]	During the third quarter of 2020, the Company recorded a $39.4 million goodwill impairment within Energy Services (see Note 2).
[3]	Total pre-tax restructuring charges for the quarter ended September 30, 2020 include cash charges of $3.7 million and non-cash charges of $0.5 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[4]	Total pre-tax restructuring charges for the quarter ended September 30, 2019 include cash charges of $3.1 million and non-cash charges of $5.5 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[5]	Total pre-tax restructuring charges for the nine months ended September 30, 2020 include cash charges of $9.5 million and non-cash charges of $3.2 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[6]	Total pre-tax restructuring charges for the nine months ended September 30, 2019 include cash charges of $11.6 million and non-cash charges of $6.4 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.

Note 12 - Segment Reporting - S

Note 12 - Segment Reporting - Summary of Revenues (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	[1]	$ 275,884	$ 308,789	$ 808,276	$ 904,433
Gross profit	[1]	60,260	66,792	163,719	182,524
Total operating income (loss)		(27,240)	14,649	(17,117)	14,334
Interest expense		(4,288)	(3,446)	(12,174)	(10,602)
Interest income		258	268	701	814
Other	[2]	245	(5,236)	1,634	(6,925)
Total other expense		(3,785)	(8,414)	(9,839)	(16,713)
Income (loss) before taxes (benefit)		(31,025)	6,235	(26,956)	(2,379)
UNITED STATES
Revenues	[1]	212,407	231,904	643,074	680,666
Gross profit	[1]	44,808	48,331	125,778	130,950
CANADA
Revenues	[1]	34,325	32,124	81,175	89,584
Gross profit	[1]	7,003	6,424	15,103	14,906
Europe [Member]
Revenues	[1]	9,957	16,347	27,820	49,731
Gross profit	[1]	3,129	4,309	8,333	11,139
Other Foreign Countries [Member]
Revenues	[1]	19,195	28,414	56,207	84,452
Gross profit	[1]	5,320	7,728	14,505	25,529
Infrastructure Solutions [Member]
Revenues		152,102	156,087	419,738	443,069
Infrastructure Solutions [Member] | UNITED STATES
Revenues		119,334	112,357	337,457	321,205
Infrastructure Solutions [Member] | CANADA
Revenues		20,864	17,775	46,092	47,320
Infrastructure Solutions [Member] | Europe [Member]
Revenues		5,727	12,889	17,500	38,302
Infrastructure Solutions [Member] | Other Foreign Countries [Member]
Revenues		6,177	13,066	18,689	36,242
Corrosion Protection [Member]
Revenues		60,986	75,901	182,545	217,996
Corrosion Protection [Member] | UNITED STATES
Revenues		30,277	42,746	99,624	116,093
Corrosion Protection [Member] | CANADA
Revenues		13,461	14,349	35,083	42,264
Corrosion Protection [Member] | Europe [Member]
Revenues		4,230	3,458	10,320	11,429
Corrosion Protection [Member] | Other Foreign Countries [Member]
Revenues		13,018	15,348	37,518	48,210
Energy Services [Member]
Revenues		62,796	76,801	205,993	243,368
Energy Services [Member] | UNITED STATES
Revenues		62,796	76,801	205,993	243,368
Energy Services [Member] | CANADA
Revenues		0	0	0	0
Energy Services [Member] | Europe [Member]
Revenues		0	0	0	0
Energy Services [Member] | Other Foreign Countries [Member]
Revenues		0	0	0	0
Operating Segments [Member] | Infrastructure Solutions [Member]
Revenues		152,102	156,087	419,738	443,069
Gross profit		41,358	39,569	108,395	105,026
Total operating income (loss)	[3]	23,497	18,376	58,056	33,211
Operating Segments [Member] | Corrosion Protection [Member]
Revenues		60,986	75,901	182,545	217,996
Gross profit		13,432	17,232	36,460	46,797
Total operating income (loss)	[4]	(1,357)	2,362	(7,105)	(3,261)
Operating Segments [Member] | Energy Services [Member]
Revenues		62,796	76,801	205,993	243,368
Gross profit		5,470	9,991	18,864	30,701
Total operating income (loss)	[5]	(41,701)	2,257	(45,238)	7,479
Corporate, Non-Segment [Member]
Total operating income (loss)	[6]	$ (7,679)	$ (8,346)	$ (22,830)	$ (23,095)
[1]	Revenues and gross profit are attributed to the country of origin
[2]	Other income in the third quarter of 2020 includes gains of $1.5 million related to restructuring (see Note 4) and a $0.6 million loss on the sale of Insituform Australia (see Note 1). Other expense in the third quarter of 2019 includes $5.3 million of restructuring charges (see Note 4). Other income (expense) in the first nine months of 2020 and 2019 includes gains of $1.8 million and charges of $6.5 million, respectively, related to restructuring (see Note 4). Other income in the first nine months of 2020 also includes gains of $0.1 million related to divestitures of Insituform Australia and Insituform Spain (see Note 1).
[3]	Operating income in the third quarters of 2020 and 2019 includes reversals of $0.2 million and charges of $1.2 million, respectively, related to restructuring (see Note 4). Additionally, the third quarter of 2019 includes $0.5 million of costs primarily related to the divestiture of certain international operations. Operating income in the first nine months of 2020 and 2019 includes $0.4 million and $4.7 million, respectively, of restructuring charges (see Note 4) and $0.2 million and $1.0 million, respectively, of divestiture costs. Additionally, operating income in the first nine months of 2020 includes $0.7 million of impairment reversals while operating income in the first nine months of 2019 includes $9.0 million of impairment charges to assets held for sale.
[4]	Operating income (loss) in the third quarters of 2020 and 2019 includes $4.5 million and $0.8 million, respectively, of restructuring charges (see Note 4). Operating loss in the first nine months of 2020 and 2019 includes $7.6 million and $4.3 million, respectively, of restructuring charges (see Note 4). Additionally, operating loss in the first nine months of 2019 includes $2.9 million of impairment charges to assets held for sale.
[5]	Operating income (loss) in the third quarters of 2020 and 2019 includes $0.9 million and $0.1 million, respectively, of restructuring charges (see Note 4). Additionally, operating loss in the third quarter of 2020 includes goodwill impairment charges of $39.4 million. Operating income (loss) in the first nine months of 2020 and 2019 includes $2.2 million and $0.2 million, respectively, of restructuring charges (see Note 4). Additionally, operating loss in the first nine months of 2020 includes $40.7 million of goodwill impairment charges and $1.0 million of definite-lived intangible asset impairment charges.
[6]	Operating loss in the third quarters of 2020 and 2019 includes $0.5 million and $1.1 million, respectively, of restructuring charges (see Note 4) and $0.7 million and $1.3 million, respectively, of divestiture costs. Operating loss in the first nine months of 2020 and 2019 includes $2.0 million and $2.4 million, respectively, of restructuring charges (see Note 4) and $2.0 million and $1.6 million, respectively, of divestiture costs.

Note 13 - Derivative Financia_3

Note 13 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019	Mar. 12, 2018	Oct. 31, 2015
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ 200
Derivative, Fixed Interest Rate				2.937%
A 2015 Interest Rate Swap [Member]
Derivative, Fixed Interest Rate					1.46%
Derivative Asset, Notional Amount					$ 262,500
A 2018 Interest Rate Swap [Member]
Derivative, Amount of Hedged Item				$ 170,600
Derivative, Fixed Interest Rate				2.937%
Derivative Asset, Notional Amount				$ 170,600
A 2015 Credit Facility [Member]
Derivative, Amount of Hedged Item					262,500
Line of Credit Facility, Maximum Borrowing Capacity					$ 350,000
A 2018 Credit Facility [Member]
Derivative Asset, Notional Amount				$ 170,600
Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, Total		$ (10,078)	$ (4,638)
Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, Total		$ (10,100)	$ (4,600)

Note 13 - Derivative Financia_4

Note 13 - Derivative Financial Instruments - Summary of Derivative Positions (Details) - Interest Rate Swap [Member]	9 Months Ended
	Sep. 30, 2020USD ($)
Notional amount	$ 170,625,000
Weighted average remaining maturities (Year)	2 years 3 months

Note 13 - Derivative Financia_5

Note 13 - Derivative Financial Instruments - Summary of Fair Value Amounts of Derivative Instruments (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative assets	$ 0	$ 261
Derivative liabilities	10,078	4,899
Net Derivative Asset (Liability)	(10,078)	(4,638)
Other Noncurrent Assets [Member] | Interest Rate Swap [Member]
Derivative assets	0	261
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member]
Derivative liabilities	$ 10,078	$ 4,899