Aegion 10-Q 31 Jul 20 2020 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Jul. 24, 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	Q2
Document Fiscal Year Focus	2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 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		30,771,371

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Revenues	[1]	$ 245,017	$ 318,740	$ 532,392		$ 595,644
Cost of revenues		191,442	251,303	428,933		479,912
Gross profit	[1]	53,575	67,437	103,459		115,732
Operating expenses		41,970	51,254	88,318		99,124
Goodwill impairment		1,258	0	1,258	[2]	0
Definite-lived intangible asset impairment		957	0	957		0
Impairment (gain) of assets held for sale		(658)	11,946	(658)		11,946
Acquisition and divestiture expenses		657	804	1,509		917
Restructuring and related charges		664	2,974	1,952		4,060
Operating income (loss)		8,727	459	10,123		(315)
Other income (expense):
Interest expense		(4,690)	(3,566)	(7,886)		(7,156)
Interest income		215	261	443		546
Other	[3]	964	(1,015)	1,389		(1,689)
Total other expense		(3,511)	(4,320)	(6,054)		(8,299)
Income (loss) before taxes on income		5,216	(3,861)	4,069		(8,614)
Taxes on income (loss)		1,220	4,286	1,376		3,524
Net income (loss)		3,996	(8,147)	2,693		(12,138)
Non-controlling interests income		(140)	(219)	(469)		(229)
Net income (loss) attributable to Aegion Corporation		$ 3,856	$ (8,366)	$ 2,224		$ (12,367)
Income (loss) per share attributable to Aegion Corporation:
Basic (in dollars per share)		$ 0.13	$ (0.27)	$ 0.07		$ (0.39)
Diluted (in dollars per share)		$ 0.12	$ (0.27)	$ 0.07		$ (0.39)
[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 in Energy Services (see Note 4).
[3]	Other expense in the second quarter of 2020 includes gains of $0.9 million related to restructuring (see Note 4). Other expense in the second quarter of 2019 includes $0.9 million of restructuring charges (see Note 4). Other expense in the first six months of 2020 and 2019 includes gains of $0.3 million and charges of $1.1 million, respectively, related to restructuring (see Note 4). Other expense in the first six months of 2020 also includes gains of $0.7 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		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net income (loss)		$ 3,996	$ (8,147)	$ 2,693	$ (12,138)
Other comprehensive income (loss):
Currency translation adjustments		3,392	1,204	(1,245)	3,066
Deferred loss on hedging activity, net of tax (1)	[1]	(238)	(3,553)	(6,174)	(5,699)
Pension activity, net of tax (2)	[2]	4	24	61	3
Total comprehensive income (loss)		7,154	(10,472)	(4,665)	(14,768)
Comprehensive income attributable to non-controlling interests		(313)	(326)	(379)	(249)
Comprehensive income (loss) attributable to Aegion Corporation		$ 6,841	$ (10,798)	$ (5,044)	$ (15,017)
[1]	Amounts presented net of tax of $0 and $91 for the quarters ended June 30, 2020 and 2019, respectively, and $0 and $150 for the six months ended June 30, 2020 and 2019, respectively.
[2]	Amounts presented net of tax of $1 and $6 for the quarters ended June 30, 2020 and 2019, respectively, and $14 and $1 for the six months ended June 30, 2020 and 2019, respectively.

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020		Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 95,324		$ 64,874
Restricted cash	994		1,348
Receivables, net of allowances of $6,431 and $7,224, respectively	171,245		192,604
Retainage	30,213		33,103
Contract assets	43,278	[1]	51,092	[2]
Inventories	49,589		57,193
Prepaid expenses and other current assets	34,570		33,909
Assets held for sale	10,367		16,092
Total current assets	435,580		450,215
Property, plant & equipment, less accumulated depreciation	100,082		101,091
Other assets
Goodwill	254,754		256,835
Intangible assets, less accumulated amortization	97,143		104,828
Operating lease assets	69,701	[3]	71,466	[4]
Deferred income tax assets	466		1,216
Other non-current assets	8,495		9,862
Total other assets	430,559		444,207
Total Assets	966,221		995,513
Current liabilities
Accounts payable	58,402		60,614
Accrued expenses	89,070		96,577
Contract liabilities	37,512	[1]	37,562	[2]
Current maturities of long-term debt	26,780		32,803
Liabilities held for sale	1,448		6,485
Total current liabilities	213,212		234,041
Long-term debt, less current maturities	233,097		243,629
Other liabilities
Operating lease liabilities	55,455		56,253
Deferred income tax liabilities	11,404		11,254
Other non-current liabilities	23,435		15,243
Total other liabilities	90,294		82,750
Total liabilities	536,603		560,420
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 30,768,399 and 30,715,959, respectively	308		307
Additional paid-in capital	100,490		101,148
Retained earnings	361,222		358,998
Accumulated other comprehensive loss	(39,962)		(32,694)
Total stockholders’ equity	422,058		427,759
Non-controlling interests	7,560		7,334
Total equity	429,618		435,093
Total Liabilities and Equity	$ 966,221		$ 995,513
[1]	Amounts exclude contract assets of $0.7 million and contract liabilities of less than $0.1 million that were classified as held for sale at June 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 less than $0.1 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 June 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	Jun. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts receivable	$ 6,431	$ 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)	30,768,399	30,715,959
Common stock, shares outstanding (in shares)	30,768,399	30,715,959

Consolidated Statements of Equi

Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]Restricted Stock Units (RSUs) [Member]	Common Stock [Member]Performance Shares [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Restricted Stock Units (RSUs) [Member]	Performance Shares [Member]	Total
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
Balance, end of period (in shares) at Mar. 31, 2019			31,491,872
Balance, beginning of period at Dec. 31, 2018			$ 319	$ 122,818	$ 379,890	$ (40,290)	$ 7,450			$ 470,187
Balance, end of period at Mar. 31, 2019			$ 315	111,597	375,889	(40,508)	7,277			454,570
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)	205,274	111,158
Issuance of shares pursuant to deferred stock units (in shares)			77,486
Shares repurchased and retired (in shares)			(1,427,716)
Balance, end of period (in shares) at Jun. 30, 2019			30,941,394
Balance, beginning of period at Dec. 31, 2018			$ 319	122,818	379,890	(40,290)	7,450			470,187
Issuance of common stock upon stock option exercises			1	955						956
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			(15)	(25,156)						(25,171)
Balance, end of period at Jun. 30, 2019			$ 309	102,841	367,523	(42,940)	6,290			434,023
Equity-based compensation expense				4,224						4,224
Net income (loss)					(12,367)		229			(12,138)
Currency translation adjustment and derivative transactions, net						(2,650)	20			(2,630)
Distributions to non-controlling interests							(1,409)			(1,409)
Balance, beginning of period (in shares) at Mar. 31, 2019			31,491,872
Issuance of common stock upon stock option exercises (in shares)			0
Issuance of shares pursuant to restricted stock units (in shares)	33,699	502
Issuance of shares pursuant to deferred stock units (in shares)			68,048
Shares repurchased and retired (in shares)			(652,727)
Balance, end of period (in shares) at Jun. 30, 2019			30,941,394
Balance, beginning of period at Mar. 31, 2019			$ 315	111,597	375,889	(40,508)	7,277			454,570
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			1							1
Shares repurchased and retired			(7)	(10,973)						(10,980)
Balance, end of period at Jun. 30, 2019			$ 309	102,841	367,523	(42,940)	6,290			434,023
Equity-based compensation expense				2,217						2,217
Net income (loss)					(8,366)		219			(8,147)
Currency translation adjustment and derivative transactions, net						(2,432)	107			(2,325)
Distributions to non-controlling interests							(1,313)			$ (1,313)
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)	188,545	71,541
Issuance of shares pursuant to deferred stock units (in shares)			56,582
Shares repurchased and retired (in shares)			(264,228)
Balance, end of period (in shares) at Jun. 30, 2020			30,768,399							30,768,399
Balance, beginning of period at Dec. 31, 2019			$ 307	101,148	358,998	(32,694)	7,334			$ 435,093
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			(3)	(5,101)						(5,104)
Balance, end of period at Jun. 30, 2020			$ 308	100,490	361,222	(39,962)	7,560			429,618
Equity-based compensation expense				4,443						4,443
Net income (loss)					2,224		469			2,693
Currency translation adjustment and derivative transactions, net						(7,268)	(90)			(7,358)
Distributions to non-controlling interests							(153)			$ (153)
Balance, beginning of period (in shares) at Mar. 31, 2020			30,679,476
Issuance of common stock upon stock option exercises (in shares)			0
Issuance of shares pursuant to restricted stock units (in shares)	35,949	0
Issuance of shares pursuant to deferred stock units (in shares)			56,582
Shares repurchased and retired (in shares)			(3,608)
Balance, end of period (in shares) at Jun. 30, 2020			30,768,399							30,768,399
Balance, beginning of period at Mar. 31, 2020			$ 307	98,103	357,366	(42,947)	7,400			$ 420,229
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			1							1
Shares repurchased and retired			0	(56)						(56)
Balance, end of period at Jun. 30, 2020			$ 308	100,490	361,222	(39,962)	7,560			429,618
Equity-based compensation expense				$ 2,443						2,443
Net income (loss)					$ 3,856		140			3,996
Currency translation adjustment and derivative transactions, net						$ 2,985	173			3,158
Distributions to non-controlling interests							$ (153)			$ (153)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ 3,996	$ (8,147)	$ 2,693		$ (12,138)
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization			18,001		17,615
Gain on sale of fixed assets			(304)		(584)
Equity-based compensation expense			4,443		4,224
Deferred income taxes			294		601
Non-cash restructuring charges			503		1,409
Goodwill impairment	1,258	0	1,258	[1]	0
Definite-lived intangible asset impairment	957	0	957		0
Impairment of assets held for sale			0		11,946
Gain on sale of businesses			(680)		0
(Gain) loss on foreign currency transactions			(319)		701
Other			983		(190)
Changes in operating assets and liabilities (net of acquisitions):
Receivables net, retainage and contract assets			30,488		(289)
Inventories			6,705		(3,966)
Prepaid expenses and other assets			(821)		6,153
Accounts payable and accrued expenses			(7,650)		(5,887)
Contract liabilities			216		(5,056)
Other operating			3,571		(360)
Net cash provided by operating activities			60,338		14,179
Cash flows from investing activities:
Capital expenditures			(10,576)		(14,328)
Proceeds from sale of fixed assets			557		968
Patent expenditures			(154)		(197)
Sale of businesses, net of cash disposed			3,602		0
Net cash used in investing activities			(6,571)		(13,557)
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises			0		956
Repurchase of common stock			(5,104)		(25,171)
Distributions to non-controlling interests			(153)		(1,409)
Credit facility amendment fees			(1,995)		0
Payments on notes payable, net			0		(179)
Proceeds from line of credit, net			2,000		7,000
Principal payments on long-term debt			(17,500)		(13,125)
Net cash used in financing activities			(22,752)		(31,928)
Effect of exchange rate changes on cash			(919)		226
Net increase (decrease) in cash, cash equivalents and restricted cash for the period			30,096		(31,080)
Cash, cash equivalents and restricted cash, beginning of year			66,222		84,886	$ 84,886
Cash, cash equivalents and restricted cash, end of period	96,318	53,806	96,318		53,806	66,222
Cash, cash equivalents and restricted cash associated with assets held for sale, end of period	0	(1,709)	0		(1,709)
Cash, cash equivalents and restricted cash, end of period	$ 96,318	$ 52,097	$ 96,318		$ 52,097	$ 66,222
[1]	During the second quarter of 2020, the Company recorded a $1.3 million goodwill impairment related to restructuring activities in Energy Services (see Note 4).

Note 1 - General

Note 1 - General	6 Months Ended
	Jun. 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, June 30, 2020 December 31, 2019. 19 5.

Note 2 - Accounting Policies

Note 2 - Accounting Policies	6 Months Ended
	Jun. 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 June 30, 2020 December 31, 2019 Currency translation adjustments (1) $ (28,396 ) $ (27,241 ) Derivative hedging activity (10,696 ) (4,522 ) Pension activity (870 ) (931 ) Total accumulated other comprehensive loss $ (39,962 ) $ (32,694 ) ( 1 During the six June 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 gains of $0.3 million and $0.1 million in the second 2020 2019 six June 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 June 30, Six Months Ended June 30, 2020 2019 2020 2019 Weighted average number of common shares used for basic EPS 30,726,566 31,216,886 30,721,684 31,459,557 Effect of dilutive stock options and restricted and deferred stock unit awards 391,918 — 475,734 — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 31,118,484 31,216,886 31,197,418 31,459,557 The Company excluded 449,156 and 498,315 restricted and deferred stock units for the quarter and six June 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 June 30, 2020 December 31, 2019 Cash and cash equivalents $ 95,324 $ 64,874 Restricted cash 994 1,348 Cash, cash equivalents and restricted cash $ 96,318 $ 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 six June 30, 2020 2019. 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 June 30, 2020 Financial data for consolidated variable interest entities are summarized in the following tables (in thousands): Balance sheet data June 30, 2020 December 31, 2019 Current assets $ 16,546 $ 18,304 Non-current assets 7,892 7,635 Current liabilities 5,764 8,261 Non-current liabilities 2,521 1,962 Quarter Ended June 30, Six Months Ended June 30, Statement of operations data 2020 2019 2020 2019 Revenue $ 5,727 $ 7,519 $ 13,456 $ 13,444 Gross profit 2,078 2,416 4,381 4,051 Net income (loss) attributable to Aegion Corporation 70 (652 ) 355 (619 ) Newly Issued Accounting Pronouncements 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	6 Months Ended
	Jun. 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 90.6% and 92.3% of revenues for the quarters ended June 30, 2020 2019, 606 55 255, not June 30, 2020 2019, On June 30, 2020, June 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 June 30, 2020 Quarter Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Geographic region: United States $ 114,705 $ 30,608 $ 52,134 $ 197,447 $ 110,957 $ 43,326 $ 85,704 $ 239,987 Canada 14,205 10,790 — 24,995 18,934 14,458 — 33,392 Europe 4,131 3,061 — 7,192 12,888 4,493 — 17,381 Other foreign 4,351 11,032 — 15,383 12,661 15,319 — 27,980 Total revenues $ 137,392 $ 55,491 $ 52,134 $ 245,017 $ 155,440 $ 77,596 $ 85,704 $ 318,740 Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Geographic region: United States $ 218,123 $ 69,347 $ 143,197 $ 430,667 $ 208,848 $ 73,347 $ 166,567 $ 448,762 Canada 25,228 21,622 — 46,850 29,545 27,915 — 57,460 Europe 11,773 6,090 — 17,863 25,413 7,971 — 33,384 Other foreign 12,512 24,500 — 37,012 23,177 32,861 — 56,038 Total revenues $ 267,636 $ 121,559 $ 143,197 $ 532,392 $ 286,983 $ 142,094 $ 166,567 $ 595,644 The following tables summarize revenues by segment and contract type (in thousands): Quarter Ended June 30, 2020 Quarter Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Contract type: Fixed fee $ 121,395 $ 38,382 $ 1,213 $ 160,990 $ 136,212 $ 53,055 $ 1,291 $ 190,558 Time and materials — 9,835 50,921 60,756 — 17,283 84,413 101,696 Product sales 15,997 7,274 — 23,271 19,184 7,258 — 26,442 License fees — — — — 44 — — 44 Total revenues $ 137,392 $ 55,491 $ 52,134 $ 245,017 $ 155,440 $ 77,596 $ 85,704 $ 318,740 Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Contract type: Fixed fee $ 233,906 $ 82,637 $ 2,943 $ 319,486 $ 255,127 $ 95,628 $ 2,210 $ 352,965 Time and materials — 22,805 140,254 163,059 — 32,259 164,357 196,616 Product sales 33,730 16,117 — 49,847 31,662 14,207 — 45,869 License fees — — — — 194 — — 194 Total revenues $ 267,636 $ 121,559 $ 143,197 $ 532,392 $ 286,983 $ 142,094 $ 166,567 $ 595,644 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): June 30, 2020 (1) December 31, 2019 (2) Contract assets – current $ 43,278 $ 51,092 Contract liabilities – current (37,512 ) (37,562 ) Net contract assets $ 5,766 $ 13,530 ( 1 Amounts exclude contract assets of $0.7 million and contract liabilities of less than $0.1 million that were classified as held for sale at June 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 six 2020 2019

Note 4 - Restructuring

Note 4 - Restructuring	6 Months Ended
	Jun. 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 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. Total pre-tax restructuring and related impairment charges since inception were $180.4 million ($162.6 million post-tax) and consisted of cash charges totaling $51.1 million and non-cash charges totaling $129.3 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 During the second 2020, 19, 19 may During the quarters and six June 30, 2020 2019 Quarter Ended June 30, 2020 Quarter Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Severance and benefit related costs $ 118 $ 106 $ 69 $ 57 $ 350 $ 551 $ 1,575 $ 6 $ — $ 2,132 Contract termination costs 36 175 — — 211 (92 ) 790 — — 698 Relocation and other moving costs — 103 — — 103 — 144 — — 144 Other restructuring costs (1) (199 ) 100 3,385 883 4,169 1,696 940 — 906 3,542 Total pre-tax restructuring charges $ (45 ) $ 484 $ 3,454 $ 940 $ 4,833 $ 2,155 $ 3,449 $ 6 $ 906 $ 6,516 ( 1 For the quarter ended June 30, 2020 P2S. June 30, 2019 Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Severance and benefit related costs $ 118 $ 969 $ 69 $ 332 $ 1,488 $ 833 $ 1,745 $ 40 $ 9 $ 2,627 Contract termination costs 36 229 62 — 327 333 807 — 98 1,238 Relocation and other moving costs — 103 34 — 137 51 144 — — 195 Other restructuring costs (1) 162 1,079 3,385 1,878 6,504 3,440 729 — 1,153 5,322 Total pre-tax restructuring charges $ 316 $ 2,380 $ 3,550 $ 2,210 $ 8,456 $ 4,657 $ 3,425 $ 40 $ 1,260 $ 9,382 ( 1 For the six June 30, 2020 P2S. six June 30, 2019 Restructuring costs related to severance, other termination benefit costs and early contract termination costs were $0.7 million and $3.0 million for the quarters ended June 30, 2020 2019 six June 30, 2020 2019, The following tables summarize all charges related to the Restructuring recognized in the quarters and six June 30, 2020 2019 Quarter Ended June 30, 2020 Quarter Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (1) Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (2) Cost of revenues $ 52 $ (131 ) $ — $ — $ (79 ) $ (67 ) $ 463 $ — $ — $ 396 Operating expenses (133 ) 1,091 1,170 838 2,966 976 331 — 898 2,205 Goodwill impairment — — 1,258 — 1,258 — — — — — Definite-lived intangible asset impairment — — 957 — 957 — — — — — Restructuring and related charges 154 384 69 57 664 459 2,509 6 — 2,974 Other expense (118 ) (860 ) — 45 (933 ) 787 146 — 8 941 Total pre-tax restructuring charges $ (45 ) $ 484 $ 3,454 $ 940 $ 4,833 $ 2,155 $ 3,449 $ 6 $ 906 $ 6,516 ( 1 Total pre-tax restructuring charges for the quarter ended June 30, 2020 ( 2 Total pre-tax restructuring charges for the quarter ended June 30, 2019 Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (1) Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (2) Cost of revenues $ 69 $ 175 $ — $ — $ 244 $ (92 ) $ 562 $ — $ — $ 470 Operating expenses 316 1,642 1,170 1,219 4,347 2,322 268 — 1,145 3,735 Goodwill impairment — — 1,258 — 1,258 — — — — — Definite-lived intangible asset impairment — — 957 — 957 — — — — — Restructuring and related charges 154 1,301 165 332 1,952 1,217 2,696 40 107 4,060 Other expense (223 ) (738 ) — 659 (302 ) 1,210 (101 ) — 8 1,117 Total pre-tax restructuring charges $ 316 $ 2,380 $ 3,550 $ 2,210 $ 8,456 $ 4,657 $ 3,425 $ 40 $ 1,260 $ 9,382 ( 1 Total pre-tax restructuring charges for the six June 30, 2020 ( 2 Total pre-tax restructuring charges for the six June 30, 2019 The following tables summarize restructuring activity during the first six 2020 2019 Utilized in 2020 Reserves at December 31, 2019 2020 Charge to Income Foreign Currency Translation Cash(1) Non-Cash Reserves at June 30, 2020 Severance and benefit related costs $ 4,389 $ 1,488 $ (21 ) $ 4,104 $ — $ 1,752 Contract termination costs 953 327 (7 ) 575 — 698 Relocation and other moving costs 367 137 — 211 — 293 Other restructuring costs 2,379 6,504 (22 ) 4,791 2,718 1,352 Total pre-tax restructuring charges $ 8,088 $ 8,456 $ (50 ) $ 9,681 $ 2,718 $ 4,095 ( 1 Refers to cash utilized to settle charges during the first six 2020 Utilized in 2019 Reserves at December 31, 2018 2019 Charge to Income Foreign Currency Translation Cash(1) Non-Cash Reserves at June 30, 2019 Severance and benefit related costs $ 1,742 $ 2,627 $ (10 ) $ 1,860 $ — $ 2,499 Contract termination costs 359 1,238 (13 ) 606 — 978 Relocation and other moving costs — 195 (1 ) 26 — 168 Other restructuring costs 311 5,322 (3 ) 3,450 1,409 771 Total pre-tax restructuring charges $ 2,412 $ 9,382 $ (27 ) $ 5,942 $ 1,409 $ 4,416 ( 1 Refers to cash utilized to settle charges during the first six 2019

Note 5 - Assets and Liabilities

Note 5 - Assets and Liabilities Held for Sale	6 Months Ended
	Jun. 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 June 30, 2020 December 31, 2019 2019 The following table provides the components of assets and liabilities held for sale (in thousands): June 30, 2020(1) December 31, 2019(2) Assets held for sale: Current assets Receivables, net $ 266 $ 4,136 Retainage 463 518 Contract assets 698 5,350 Inventories 141 2,097 Prepaid expenses and other current assets 194 799 Total current assets 1,762 12,900 Property, plant & equipment, less accumulated depreciation 7,233 10,962 Goodwill 2,640 4,224 Intangible assets, less accumulated amortization 1,429 1,528 Operating lease assets 42 326 Other non-current assets 122 130 Impairment of assets held for sale (2,861 ) (13,978 ) Total assets held for sale $ 10,367 $ 16,092 Liabilities held for sale: Current liabilities Accounts payable $ 280 $ 2,174 Accrued expenses 1,072 3,961 Contract liabilities 43 122 Total current liabilities 1,395 6,257 Operating lease liabilities 6 174 Other non-current liabilities 47 54 Total liabilities held for sale $ 1,448 $ 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	6 Months Ended
	Jun. 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 June 30, Six Months Ended June 30, 2020 2019 2020 2019 Operating lease cost $ 4,932 $ 5,938 $ 10,138 $ 11,390 Short-term lease cost 4,785 5,482 10,866 12,721 Total lease cost $ 9,717 $ 11,420 $ 21,004 $ 24,111 Supplemental balance sheet information related to leases was as follows (in thousands): June 30, 2020(1) December 31, 2019(2) Operating leases: Operating lease assets $ 69,701 $ 71,466 Accrued expenses $ 15,378 $ 15,828 Other liabilities 55,455 56,253 Total operating lease liabilities $ 70,833 $ 72,081 Weighted-average remaining lease term (in years) 5.86 5.74 Weighted-average discount rate 5.12 % 5.71 % ( 1 Amounts exclude operating lease assets of less than $0.1 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 June 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	6 Months Ended
	Jun. 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: Impairment (1) — — (1,258 ) (1,258 ) Foreign currency translation (436 ) (387 ) — (823 ) Balance, June 30, 2020 Goodwill, gross 239,724 76,559 81,504 397,787 Accumulated impairment losses (62,848 ) (45,400 ) (34,785 ) (143,033 ) Goodwill, net $ 176,876 $ 31,159 $ 46,719 $ 254,754 ( 1 During the second 2020, 4 Intangible Assets Intangible assets consisted of the following (in thousands): June 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 0.2 $ 3,894 $ (3,871 ) $ 23 $ 3,894 $ (3,824 ) $ 70 Leases 0.5 864 (820 ) 44 864 (777 ) 87 Trademarks (1) 9.2 15,437 (7,261 ) 8,176 15,699 (6,911 ) 8,788 Non-competes 2.9 2,048 (1,391 ) 657 2,301 (1,354 ) 947 Customer relationships (1) 6.9 156,817 (81,931 ) 74,886 157,576 (76,832 ) 80,744 Patents and acquired technology 7.3 38,728 (25,371 ) 13,357 39,289 (25,097 ) 14,192 Total intangible assets — $ 217,788 $ (120,645 ) $ 97,143 $ 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 June 30, 2020 2019 six June 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	6 Months Ended
	Jun. 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): June 30, 2020 December 31, 2019 Term note, due February 27, 2023, annualized rates of 4.25% and 4.09%, respectively $ 236,250 $ 253,750 Line of credit, 4.25% and 4.01%, respectively 26,000 24,000 Other notes with interest rates from 3.3% to 7.8% 681 770 Subtotal 262,931 278,520 Less – Current maturities of long-term debt 26,780 32,803 Less – Unamortized loan costs 3,054 2,088 Total $ 233,097 $ 243,629 In October 2015, February 2018, December 2018 April 2020, June 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. June 30, 2020 The Company’s indebtedness at June 30, 2020 second 2020 As of June 30, 2020 The Company’s indebtedness at December 31, 2019 third At June 30, 2020 December 31, 2019 2 2. In October 2015, October 2020 $262.5 $262.5 $262.5 $262.5 June 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 June 30, 2020 • Consolidated financial leverage ratio compares consolidated funded indebtedness to amended Credit Facility defined income with a maximum amount not 1.00. June 30, 2020 1.00 • 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. June 30, 2020, 1.00. At June 30, 2020

Note 9 - Stockholders' Equity a

Note 9 - Stockholders' Equity and Equity Compensation	6 Months Ended
	Jun. 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 December 2018. June 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 six 2020 During the first six 2019, Equity-Based Compensation Plans In April 2016, 2016 2017 2016 “2016 April 2018, 2016 2016 2016 2013 2016 June 30, 2020 2016 In April 2016, 2016 “2016 2011 April 2019, 2016 2016 2016 2016 2016 June 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 391,171 20.02 Performance stock units awarded 131,755 22.96 Restricted stock units distributed (188,545 ) 22.30 Performance stock units distributed (71,541 ) 28.18 Restricted stock units forfeited (28,928 ) 21.07 Performance stock units forfeited (76,282 ) 27.46 Outstanding at June 30, 2020 1,192,594 $ 21.76 Expense associated with stock awards was $2.3 million and $2.0 million for the quarters ended June 30, 2020 2019 six June 30, 2020 2019, June 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 64,010 14.55 Distributed (56,582 ) 21.63 Outstanding at June 30, 2020 260,768 $ 19.00 Expense associated with deferred stock unit awards was $0.2 million and $0.2 million for the quarters ended June 30, 2020 2019 six June 30, 2020 2019, June 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 June 30, 2020 December 31, 2019.

Note 10 - Taxes on Income

Note 10 - Taxes on Income	6 Months Ended
	Jun. 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 six June 30, 2020 no The Company’s effective tax rate in the quarter and six June 30, 2019 not no

Note 11 - Commitments and Conti

Note 11 - Commitments and Contingencies	6 Months Ended
	Jun. 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 June 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 June 30, 2020

Note 12 - Segment Reporting

Note 12 - Segment Reporting	6 Months Ended
	Jun. 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 June 30, Six Months Ended June 30, 2020 2019 2020 2019 Revenues: Infrastructure Solutions $ 137,392 $ 155,439 $ 267,636 $ 286,982 Corrosion Protection 55,491 77,597 121,559 142,095 Energy Services 52,134 85,704 143,197 166,567 Total revenues $ 245,017 $ 318,740 $ 532,392 $ 595,644 Gross profit: Infrastructure Solutions $ 35,667 $ 38,871 $ 67,037 $ 65,457 Corrosion Protection 14,111 16,692 23,028 29,565 Energy Services 3,797 11,874 13,394 20,710 Total gross profit $ 53,575 $ 67,437 $ 103,459 $ 115,732 Operating income (loss): Infrastructure Solutions (1) $ 21,004 $ 9,120 $ 34,559 $ 14,835 Corrosion Protection (2) 699 (3,863 ) (5,748 ) (5,623 ) Energy Services (3) (5,713 ) 4,107 (3,537 ) 5,222 Corporate (4) (7,263 ) (8,905 ) (15,151 ) (14,749 ) Total operating income (loss) 8,727 459 10,123 (315 ) Other income (expense): Interest expense (4,690 ) (3,566 ) (7,886 ) (7,156 ) Interest income 215 261 443 546 Other (5) 964 (1,015 ) 1,389 (1,689 ) Total other expense (3,511 ) (4,320 ) (6,054 ) (8,299 ) Income (loss) before taxes on income $ 5,216 $ (3,861 ) $ 4,069 $ (8,614 ) ( 1 Operating income in the second 2020 2019 4 first six 2020 2019 4 second first six 2020 second first six 2019 ( 2 Operating income (loss) in the second 2020 2019 4 first six 2020 2019 4 second first six 2019 ( 3 Operating loss in the second 2020 2019 4 first six 2020 2019 4 second first six 2020 ( 4 Operating loss in the second 2020 2019 4 first six 2020 2019 4 ( 5 Other expense in the second 2020 4 second 2019 4 first six 2020 2019 4 first six 2020 1 The following table summarizes revenues and gross profit by geographic region (in thousands): Quarter Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Revenues: (1) United States $ 197,447 $ 239,987 $ 430,667 $ 448,762 Canada 24,995 33,392 46,850 57,460 Europe 7,192 17,381 17,863 33,384 Other foreign 15,383 27,980 37,012 56,038 Total revenues $ 245,017 $ 318,740 $ 532,392 $ 595,644 Gross profit: (1) United States $ 41,334 $ 50,792 $ 80,970 $ 82,619 Canada 5,369 5,028 8,100 8,482 Europe 2,256 3,311 5,204 6,830 Other foreign 4,616 8,306 9,185 17,801 Total gross profit $ 53,575 $ 67,437 $ 103,459 $ 115,732 ( 1 Revenues and gross profit are attributed to the country of origin

Note 13 - Derivative Financial

Note 13 - Derivative Financial Instruments	6 Months Ended
	Jun. 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 June 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 six 2020. first six 2019 In October 2015, October 2020 $262.5 $262.5 On March 12, 2018, October 2020 February 2023 October 2020 The following table summarizes the Company’s derivative position at June 30, 2020 Position Notional Amount Weighted Average Remaining Maturity In Years Average Exchange Rate Interest Rate Swap — $ 177,187,500 2.50 — 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 June 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 $ 10,696 $ 4,899 Total Liabilities $ 10,696 $ 4,899 Total Derivative Assets $ — $ 261 Total Derivative Liabilities 10,696 4,899 Total Net Derivative Liability $ (10,696 ) $ (4,638 )

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 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 June 30, 2020 December 31, 2019 Currency translation adjustments (1) $ (28,396 ) $ (27,241 ) Derivative hedging activity (10,696 ) (4,522 ) Pension activity (870 ) (931 ) Total accumulated other comprehensive loss $ (39,962 ) $ (32,694 ) ( 1 During the six June 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 gains of $0.3 million and $0.1 million in the second 2020 2019 six June 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 June 30, Six Months Ended June 30, 2020 2019 2020 2019 Weighted average number of common shares used for basic EPS 30,726,566 31,216,886 30,721,684 31,459,557 Effect of dilutive stock options and restricted and deferred stock unit awards 391,918 — 475,734 — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 31,118,484 31,216,886 31,197,418 31,459,557 The Company excluded 449,156 and 498,315 restricted and deferred stock units for the quarter and six June 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 June 30, 2020 December 31, 2019 Cash and cash equivalents $ 95,324 $ 64,874 Restricted cash 994 1,348 Cash, cash equivalents and restricted cash $ 96,318 $ 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 six June 30, 2020 2019.
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 June 30, 2020 Financial data for consolidated variable interest entities are summarized in the following tables (in thousands): Balance sheet data June 30, 2020 December 31, 2019 Current assets $ 16,546 $ 18,304 Non-current assets 7,892 7,635 Current liabilities 5,764 8,261 Non-current liabilities 2,521 1,962 Quarter Ended June 30, Six Months Ended June 30, Statement of operations data 2020 2019 2020 2019 Revenue $ 5,727 $ 7,519 $ 13,456 $ 13,444 Gross profit 2,078 2,416 4,381 4,051 Net income (loss) attributable to Aegion Corporation 70 (652 ) 355 (619 )
New Accounting Pronouncements, Policy [Policy Text Block]	Newly Issued Accounting Pronouncements 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)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	June 30, 2020 December 31, 2019 Currency translation adjustments (1) $ (28,396 ) $ (27,241 ) Derivative hedging activity (10,696 ) (4,522 ) Pension activity (870 ) (931 ) Total accumulated other comprehensive loss $ (39,962 ) $ (32,694 )
Schedule of Weighted Average Number of Shares [Table Text Block]	Quarter Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Weighted average number of common shares used for basic EPS 30,726,566 31,216,886 30,721,684 31,459,557 Effect of dilutive stock options and restricted and deferred stock unit awards 391,918 — 475,734 — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 31,118,484 31,216,886 31,197,418 31,459,557
Restrictions on Cash and Cash Equivalents [Table Text Block]	Balance sheet data June 30, 2020 December 31, 2019 Cash and cash equivalents $ 95,324 $ 64,874 Restricted cash 994 1,348 Cash, cash equivalents and restricted cash $ 96,318 $ 66,222
Schedule of Variable Interest Entities [Table Text Block]	Balance sheet data June 30, 2020 December 31, 2019 Current assets $ 16,546 $ 18,304 Non-current assets 7,892 7,635 Current liabilities 5,764 8,261 Non-current liabilities 2,521 1,962 Quarter Ended June 30, Six Months Ended June 30, Statement of operations data 2020 2019 2020 2019 Revenue $ 5,727 $ 7,519 $ 13,456 $ 13,444 Gross profit 2,078 2,416 4,381 4,051 Net income (loss) attributable to Aegion Corporation 70 (652 ) 355 (619 )

Note 3 - Revenues (Tables)

Note 3 - Revenues (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Disaggregation of Revenue [Table Text Block]	Quarter Ended June 30, 2020 Quarter Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Geographic region: United States $ 114,705 $ 30,608 $ 52,134 $ 197,447 $ 110,957 $ 43,326 $ 85,704 $ 239,987 Canada 14,205 10,790 — 24,995 18,934 14,458 — 33,392 Europe 4,131 3,061 — 7,192 12,888 4,493 — 17,381 Other foreign 4,351 11,032 — 15,383 12,661 15,319 — 27,980 Total revenues $ 137,392 $ 55,491 $ 52,134 $ 245,017 $ 155,440 $ 77,596 $ 85,704 $ 318,740 Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Geographic region: United States $ 218,123 $ 69,347 $ 143,197 $ 430,667 $ 208,848 $ 73,347 $ 166,567 $ 448,762 Canada 25,228 21,622 — 46,850 29,545 27,915 — 57,460 Europe 11,773 6,090 — 17,863 25,413 7,971 — 33,384 Other foreign 12,512 24,500 — 37,012 23,177 32,861 — 56,038 Total revenues $ 267,636 $ 121,559 $ 143,197 $ 532,392 $ 286,983 $ 142,094 $ 166,567 $ 595,644 Quarter Ended June 30, 2020 Quarter Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Contract type: Fixed fee $ 121,395 $ 38,382 $ 1,213 $ 160,990 $ 136,212 $ 53,055 $ 1,291 $ 190,558 Time and materials — 9,835 50,921 60,756 — 17,283 84,413 101,696 Product sales 15,997 7,274 — 23,271 19,184 7,258 — 26,442 License fees — — — — 44 — — 44 Total revenues $ 137,392 $ 55,491 $ 52,134 $ 245,017 $ 155,440 $ 77,596 $ 85,704 $ 318,740 Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Contract type: Fixed fee $ 233,906 $ 82,637 $ 2,943 $ 319,486 $ 255,127 $ 95,628 $ 2,210 $ 352,965 Time and materials — 22,805 140,254 163,059 — 32,259 164,357 196,616 Product sales 33,730 16,117 — 49,847 31,662 14,207 — 45,869 License fees — — — — 194 — — 194 Total revenues $ 267,636 $ 121,559 $ 143,197 $ 532,392 $ 286,983 $ 142,094 $ 166,567 $ 595,644
Contract Asset and Liability [Table Text Block]	June 30, 2020 (1) December 31, 2019 (2) Contract assets – current $ 43,278 $ 51,092 Contract liabilities – current (37,512 ) (37,562 ) Net contract assets $ 5,766 $ 13,530

Note 4 - Restructuring (Tables)

Note 4 - Restructuring (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Restructuring and Related Costs [Table Text Block]	Quarter Ended June 30, 2020 Quarter Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Severance and benefit related costs $ 118 $ 106 $ 69 $ 57 $ 350 $ 551 $ 1,575 $ 6 $ — $ 2,132 Contract termination costs 36 175 — — 211 (92 ) 790 — — 698 Relocation and other moving costs — 103 — — 103 — 144 — — 144 Other restructuring costs (1) (199 ) 100 3,385 883 4,169 1,696 940 — 906 3,542 Total pre-tax restructuring charges $ (45 ) $ 484 $ 3,454 $ 940 $ 4,833 $ 2,155 $ 3,449 $ 6 $ 906 $ 6,516 Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Severance and benefit related costs $ 118 $ 969 $ 69 $ 332 $ 1,488 $ 833 $ 1,745 $ 40 $ 9 $ 2,627 Contract termination costs 36 229 62 — 327 333 807 — 98 1,238 Relocation and other moving costs — 103 34 — 137 51 144 — — 195 Other restructuring costs (1) 162 1,079 3,385 1,878 6,504 3,440 729 — 1,153 5,322 Total pre-tax restructuring charges $ 316 $ 2,380 $ 3,550 $ 2,210 $ 8,456 $ 4,657 $ 3,425 $ 40 $ 1,260 $ 9,382 Quarter Ended June 30, 2020 Quarter Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (1) Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (2) Cost of revenues $ 52 $ (131 ) $ — $ — $ (79 ) $ (67 ) $ 463 $ — $ — $ 396 Operating expenses (133 ) 1,091 1,170 838 2,966 976 331 — 898 2,205 Goodwill impairment — — 1,258 — 1,258 — — — — — Definite-lived intangible asset impairment — — 957 — 957 — — — — — Restructuring and related charges 154 384 69 57 664 459 2,509 6 — 2,974 Other expense (118 ) (860 ) — 45 (933 ) 787 146 — 8 941 Total pre-tax restructuring charges $ (45 ) $ 484 $ 3,454 $ 940 $ 4,833 $ 2,155 $ 3,449 $ 6 $ 906 $ 6,516 Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (1) Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (2) Cost of revenues $ 69 $ 175 $ — $ — $ 244 $ (92 ) $ 562 $ — $ — $ 470 Operating expenses 316 1,642 1,170 1,219 4,347 2,322 268 — 1,145 3,735 Goodwill impairment — — 1,258 — 1,258 — — — — — Definite-lived intangible asset impairment — — 957 — 957 — — — — — Restructuring and related charges 154 1,301 165 332 1,952 1,217 2,696 40 107 4,060 Other expense (223 ) (738 ) — 659 (302 ) 1,210 (101 ) — 8 1,117 Total pre-tax restructuring charges $ 316 $ 2,380 $ 3,550 $ 2,210 $ 8,456 $ 4,657 $ 3,425 $ 40 $ 1,260 $ 9,382
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 June 30, 2020 Severance and benefit related costs $ 4,389 $ 1,488 $ (21 ) $ 4,104 $ — $ 1,752 Contract termination costs 953 327 (7 ) 575 — 698 Relocation and other moving costs 367 137 — 211 — 293 Other restructuring costs 2,379 6,504 (22 ) 4,791 2,718 1,352 Total pre-tax restructuring charges $ 8,088 $ 8,456 $ (50 ) $ 9,681 $ 2,718 $ 4,095 Utilized in 2019 Reserves at December 31, 2018 2019 Charge to Income Foreign Currency Translation Cash(1) Non-Cash Reserves at June 30, 2019 Severance and benefit related costs $ 1,742 $ 2,627 $ (10 ) $ 1,860 $ — $ 2,499 Contract termination costs 359 1,238 (13 ) 606 — 978 Relocation and other moving costs — 195 (1 ) 26 — 168 Other restructuring costs 311 5,322 (3 ) 3,450 1,409 771 Total pre-tax restructuring charges $ 2,412 $ 9,382 $ (27 ) $ 5,942 $ 1,409 $ 4,416

Note 5 - Assets and Liabiliti_2

Note 5 - Assets and Liabilities Held for Sale (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Disposal Groups, Including Discontinued Operations [Table Text Block]	June 30, 2020(1) December 31, 2019(2) Assets held for sale: Current assets Receivables, net $ 266 $ 4,136 Retainage 463 518 Contract assets 698 5,350 Inventories 141 2,097 Prepaid expenses and other current assets 194 799 Total current assets 1,762 12,900 Property, plant & equipment, less accumulated depreciation 7,233 10,962 Goodwill 2,640 4,224 Intangible assets, less accumulated amortization 1,429 1,528 Operating lease assets 42 326 Other non-current assets 122 130 Impairment of assets held for sale (2,861 ) (13,978 ) Total assets held for sale $ 10,367 $ 16,092 Liabilities held for sale: Current liabilities Accounts payable $ 280 $ 2,174 Accrued expenses 1,072 3,961 Contract liabilities 43 122 Total current liabilities 1,395 6,257 Operating lease liabilities 6 174 Other non-current liabilities 47 54 Total liabilities held for sale $ 1,448 $ 6,485

Note 6 - Leases (Tables)

Note 6 - Leases (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Lease, Cost [Table Text Block]	Quarter Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Operating lease cost $ 4,932 $ 5,938 $ 10,138 $ 11,390 Short-term lease cost 4,785 5,482 10,866 12,721 Total lease cost $ 9,717 $ 11,420 $ 21,004 $ 24,111
Lease, Supplemental Financial Statement Disclosures, Balance Sheet [Table Text Block]	June 30, 2020(1) December 31, 2019(2) Operating leases: Operating lease assets $ 69,701 $ 71,466 Accrued expenses $ 15,378 $ 15,828 Other liabilities 55,455 56,253 Total operating lease liabilities $ 70,833 $ 72,081 Weighted-average remaining lease term (in years) 5.86 5.74 Weighted-average discount rate 5.12 % 5.71 %

Note 7 - Goodwill and Intangi_2

Note 7 - Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 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: Impairment (1) — — (1,258 ) (1,258 ) Foreign currency translation (436 ) (387 ) — (823 ) Balance, June 30, 2020 Goodwill, gross 239,724 76,559 81,504 397,787 Accumulated impairment losses (62,848 ) (45,400 ) (34,785 ) (143,033 ) Goodwill, net $ 176,876 $ 31,159 $ 46,719 $ 254,754
Schedule of Finite-Lived Intangible Assets [Table Text Block]	June 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 0.2 $ 3,894 $ (3,871 ) $ 23 $ 3,894 $ (3,824 ) $ 70 Leases 0.5 864 (820 ) 44 864 (777 ) 87 Trademarks (1) 9.2 15,437 (7,261 ) 8,176 15,699 (6,911 ) 8,788 Non-competes 2.9 2,048 (1,391 ) 657 2,301 (1,354 ) 947 Customer relationships (1) 6.9 156,817 (81,931 ) 74,886 157,576 (76,832 ) 80,744 Patents and acquired technology 7.3 38,728 (25,371 ) 13,357 39,289 (25,097 ) 14,192 Total intangible assets — $ 217,788 $ (120,645 ) $ 97,143 $ 219,623 $ (114,795 ) $ 104,828

Note 8 - Long-term Debt and C_2

Note 8 - Long-term Debt and Credit Facility (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Long-term Debt Instruments [Table Text Block]	June 30, 2020 December 31, 2019 Term note, due February 27, 2023, annualized rates of 4.25% and 4.09%, respectively $ 236,250 $ 253,750 Line of credit, 4.25% and 4.01%, respectively 26,000 24,000 Other notes with interest rates from 3.3% to 7.8% 681 770 Subtotal 262,931 278,520 Less – Current maturities of long-term debt 26,780 32,803 Less – Unamortized loan costs 3,054 2,088 Total $ 233,097 $ 243,629

Note 9 - Stockholders' Equity_2

Note 9 - Stockholders' Equity and Equity Compensation (Tables)	6 Months Ended
	Jun. 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 391,171 20.02 Performance stock units awarded 131,755 22.96 Restricted stock units distributed (188,545 ) 22.30 Performance stock units distributed (71,541 ) 28.18 Restricted stock units forfeited (28,928 ) 21.07 Performance stock units forfeited (76,282 ) 27.46 Outstanding at June 30, 2020 1,192,594 $ 21.76
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 64,010 14.55 Distributed (56,582 ) 21.63 Outstanding at June 30, 2020 260,768 $ 19.00

Note 12 - Segment Reporting (Ta

Note 12 - Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Quarter Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Revenues: Infrastructure Solutions $ 137,392 $ 155,439 $ 267,636 $ 286,982 Corrosion Protection 55,491 77,597 121,559 142,095 Energy Services 52,134 85,704 143,197 166,567 Total revenues $ 245,017 $ 318,740 $ 532,392 $ 595,644 Gross profit: Infrastructure Solutions $ 35,667 $ 38,871 $ 67,037 $ 65,457 Corrosion Protection 14,111 16,692 23,028 29,565 Energy Services 3,797 11,874 13,394 20,710 Total gross profit $ 53,575 $ 67,437 $ 103,459 $ 115,732 Operating income (loss): Infrastructure Solutions (1) $ 21,004 $ 9,120 $ 34,559 $ 14,835 Corrosion Protection (2) 699 (3,863 ) (5,748 ) (5,623 ) Energy Services (3) (5,713 ) 4,107 (3,537 ) 5,222 Corporate (4) (7,263 ) (8,905 ) (15,151 ) (14,749 ) Total operating income (loss) 8,727 459 10,123 (315 ) Other income (expense): Interest expense (4,690 ) (3,566 ) (7,886 ) (7,156 ) Interest income 215 261 443 546 Other (5) 964 (1,015 ) 1,389 (1,689 ) Total other expense (3,511 ) (4,320 ) (6,054 ) (8,299 ) Income (loss) before taxes on income $ 5,216 $ (3,861 ) $ 4,069 $ (8,614 ) Quarter Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Revenues: (1) United States $ 197,447 $ 239,987 $ 430,667 $ 448,762 Canada 24,995 33,392 46,850 57,460 Europe 7,192 17,381 17,863 33,384 Other foreign 15,383 27,980 37,012 56,038 Total revenues $ 245,017 $ 318,740 $ 532,392 $ 595,644 Gross profit: (1) United States $ 41,334 $ 50,792 $ 80,970 $ 82,619 Canada 5,369 5,028 8,100 8,482 Europe 2,256 3,311 5,204 6,830 Other foreign 4,616 8,306 9,185 17,801 Total gross profit $ 53,575 $ 67,437 $ 103,459 $ 115,732

Note 13 - Derivative Financia_2

Note 13 - Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 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 — $ 177,187,500 2.50 —
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	Designation of Derivatives Balance Sheet Location June 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 $ 10,696 $ 4,899 Total Liabilities $ 10,696 $ 4,899 Total Derivative Assets $ — $ 261 Total Derivative Liabilities 10,696 4,899 Total Net Derivative Liability $ (10,696 ) $ (4,638 )

Note 2 - Accounting Policies (D

Note 2 - Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax, Total			$ 800
Foreign Currency Transaction Gain (Loss), Realized			$ 319	$ (701)
Stock Options and Restricted and Deferred Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)			449,156	498,315
Other Expense [Member]
Foreign Currency Transaction Gain (Loss), Realized	$ 300	$ 100	$ (300)	$ (700)

Note 2 - Accounting Policies -

Note 2 - Accounting Policies - Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Currency translation adjustments	[1]	$ (28,396)	$ (27,241)
Derivative hedging activity		(10,696)	(4,522)
Pension activity		(870)	(931)
Total accumulated other comprehensive loss		$ (39,962)	$ (32,694)
[1]	During the six months ended June 30, 2020, as a result of disposing of certain international entities, $0.8 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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Weighted average number of common shares used for basic EPS (in shares)	30,726,566	31,216,886	30,721,684	31,459,557
Effect of dilutive stock options and restricted and deferred stock unit awards (in shares)	391,918	0	475,734	0
Weighted average number of common shares and dilutive potential common stock used for dilutive EPS (in shares)	31,118,484	31,216,886	31,197,418	31,459,557

Note 2 - Accounting Policies _3

Note 2 - Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Cash and cash equivalents	$ 95,324	$ 64,874
Restricted cash	994	1,348
Cash, cash equivalents and restricted cash	$ 96,318	$ 66,222	$ 52,097

Note 2 - Accounting Policies _4

Note 2 - Accounting Policies - Investments in Variable Interest Entities (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Current assets		$ 435,580		$ 435,580		$ 450,215
Current liabilities		213,212		213,212		234,041
Revenue	[1]	245,017	$ 318,740	532,392	$ 595,644
Gross profit	[1]	53,575	67,437	103,459	115,732
Net income (loss) attributable to Aegion Corporation		3,856	(8,366)	2,224	(12,367)
Variable Interest Entity, Primary Beneficiary [Member]
Current assets		16,546		16,546		18,304
Non-current assets		7,892		7,892		7,635
Current liabilities		5,764		5,764		8,261
Non-current liabilities		2,521		2,521		$ 1,962
Revenue		5,727	7,519	13,456	13,444
Gross profit		2,078	2,416	4,381	4,051
Net income (loss) attributable to Aegion Corporation		$ 70	$ (652)	$ 355	$ (619)
[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
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Disposal Group, Including Discontinued Operation, Contract Assets, Current	$ 0.7		$ 5.4
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current	0.1		0.1
Contract with Customer, Liability, Total			$ 37.6	$ 32.3
Construction, Engineering and Installation Services [Member]
Revenue, Remaining Performance Obligation, Amount	$ 501.8
Product and Services [Member]
Revenue Recognized, Percent	90.60%	92.30%
Product [Member]
Revenue Recognized, Percent	9.40%	7.70%

Note 3 - Revenues 2 (Details Te

Note 3 - Revenues 2 (Details Textual) - Construction, Engineering and Installation Services [Member] $ in Millions	Jun. 30, 2020USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 501.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Amount	$ 480
Revenue, Remaining Performance Obligation, Percentage	95.70%
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		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	[1]	$ 245,017	$ 318,740	$ 532,392	$ 595,644
Fixed-price Contract [Member]
Revenues		160,990	190,558	319,486	352,965
Time-and-materials Contract [Member]
Revenues		60,756	101,696	163,059	196,616
Product Sales [Member]
Revenues		23,271	26,442	49,847	45,869
License Fees [Member]
Revenues		0	44	0	194
Infrastructure Solutions [Member]
Revenues		137,392	155,440	267,636	286,983
Infrastructure Solutions [Member] | Fixed-price Contract [Member]
Revenues		121,395	136,212	233,906	255,127
Infrastructure Solutions [Member] | Time-and-materials Contract [Member]
Revenues		0	0	0	0
Infrastructure Solutions [Member] | Product Sales [Member]
Revenues		15,997	19,184	33,730	31,662
Infrastructure Solutions [Member] | License Fees [Member]
Revenues		0	44	0	194
Corrosion Protection [Member]
Revenues		55,491	77,596	121,559	142,094
Corrosion Protection [Member] | Fixed-price Contract [Member]
Revenues		38,382	53,055	82,637	95,628
Corrosion Protection [Member] | Time-and-materials Contract [Member]
Revenues		9,835	17,283	22,805	32,259
Corrosion Protection [Member] | Product Sales [Member]
Revenues		7,274	7,258	16,117	14,207
Corrosion Protection [Member] | License Fees [Member]
Revenues		0	0	0	0
Energy Services [Member]
Revenues		52,134	85,704	143,197	166,567
Energy Services [Member] | Fixed-price Contract [Member]
Revenues		1,213	1,291	2,943	2,210
Energy Services [Member] | Time-and-materials Contract [Member]
Revenues		50,921	84,413	140,254	164,357
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]	197,447	239,987	430,667	448,762
UNITED STATES | Infrastructure Solutions [Member]
Revenues		114,705	110,957	218,123	208,848
UNITED STATES | Corrosion Protection [Member]
Revenues		30,608	43,326	69,347	73,347
UNITED STATES | Energy Services [Member]
Revenues		52,134	85,704	143,197	166,567
CANADA
Revenues	[1]	24,995	33,392	46,850	57,460
CANADA | Infrastructure Solutions [Member]
Revenues		14,205	18,934	25,228	29,545
CANADA | Corrosion Protection [Member]
Revenues		10,790	14,458	21,622	27,915
CANADA | Energy Services [Member]
Revenues		0	0	0	0
Europe [Member]
Revenues	[1]	7,192	17,381	17,863	33,384
Europe [Member] | Infrastructure Solutions [Member]
Revenues		4,131	12,888	11,773	25,413
Europe [Member] | Corrosion Protection [Member]
Revenues		3,061	4,493	6,090	7,971
Europe [Member] | Energy Services [Member]
Revenues		0	0	0	0
Other Foreign Countries [Member]
Revenues	[1]	15,383	27,980	37,012	56,038
Other Foreign Countries [Member] | Infrastructure Solutions [Member]
Revenues		4,351	12,661	12,512	23,177
Other Foreign Countries [Member] | Corrosion Protection [Member]
Revenues		11,032	15,319	24,500	32,861
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	Jun. 30, 2020	[1]	Dec. 31, 2019	[2]
Contract assets – current	$ 43,278		$ 51,092
Contract liabilities – current	(37,512)		(37,562)
Net contract assets	$ 5,766		$ 13,530
[1]	Amounts exclude contract assets of $0.7 million and contract liabilities of less than $0.1 million that were classified as held for sale at June 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			6 Months Ended				12 Months Ended		35 Months Ended
	Jun. 30, 2020USD ($)	Dec. 31, 2019	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)		Jun. 30, 2019USD ($)		Dec. 31, 2019	Dec. 31, 2017USD ($)	Jun. 30, 2020USD ($)
Restructuring Charges, Non-Cash				$ 503		$ 1,409
Minimum [Member]
Expected Restructuring Cash Charges Related to COVID-19	$ 3,000			3,000						$ 3,000
Maximum [Member]
Expected Restructuring Cash Charges Related to COVID-19	5,000			5,000						5,000
Restructuring 2017 [Member]
Restructuring Charges Pre Tax										180,400
Restructuring Charges, Net of Tax										162,600
Payments for Restructuring				9,681	[1]	5,942	[2]			51,100
Restructuring Reserve, Settled without Cash										$ 129,300
Restructuring and Related Cost, Number of Positions Eliminated										745
Restructuring Charges, Cash	2,600		$ 5,400	5,800		8,500
Restructuring Charges, Non-Cash	2,200		1,100	2,700		900
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									$ 42,900
Severance, Other Termination Benefit Costs and Contract Termination Costs [Member] | Restructuring 2017 [Member]
Restructuring and Related Costs, Incurred Cost, Total	$ 700		$ 3,000	$ 2,000		$ 4,100
[1]	Refers to cash utilized to settle charges during the first six months of 2020.
[2]	Refers to cash utilized to settle charges during the first six 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				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019
Restructuring charges	$ 4,833	[1]	$ 6,516	[2]	$ 8,456	[3]	$ 9,382	[4]
Cost of Revenues [Member]
Restructuring charges	(79)	[1]	396	[2]	244	[3]	470	[4]
Operating Expense [Member]
Restructuring charges	2,966	[1]	2,205	[2]	4,347	[3]	3,735	[4]
Goodwill Impairment [Member]
Restructuring charges	1,258	[1]	0	[2]	1,258	[3]	0	[4]
Definite-lived Intangible Asset Impairment [Member]
Restructuring charges	957	[1]	0	[2]	957	[3]	0	[4]
Restructuring and Related Charges [Member]
Restructuring charges	664	[1]	2,974	[2]	1,952	[3]	4,060	[4]
Other Expense [Member]
Restructuring charges	(933)	[1]	941	[2]	(302)	[3]	1,117	[4]
Employee Severance [Member]
Restructuring charges	350		2,132		1,488		2,627
Contract Termination [Member]
Restructuring charges	211		698		327		1,238
Employee Relocation [Member]
Restructuring charges	103		144		137		195
Other Restructuring [Member]
Restructuring charges	4,169	[5]	3,542	[5]	6,504	[6]	5,322	[6]
Operating Segments [Member] | Infrastructure Solutions [Member]
Restructuring charges	(45)		2,155		316		4,657
Operating Segments [Member] | Infrastructure Solutions [Member] | Cost of Revenues [Member]
Restructuring charges	52		(67)		69		(92)
Operating Segments [Member] | Infrastructure Solutions [Member] | Operating Expense [Member]
Restructuring charges	(133)		976		316		2,322
Operating Segments [Member] | Infrastructure Solutions [Member] | Goodwill Impairment [Member]
Restructuring charges	0		0		0		0
Operating Segments [Member] | Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges	0		0		0		0
Operating Segments [Member] | Infrastructure Solutions [Member] | Restructuring and Related Charges [Member]
Restructuring charges	154		459		154		1,217
Operating Segments [Member] | Infrastructure Solutions [Member] | Other Expense [Member]
Restructuring charges	(118)		787		(223)		1,210
Operating Segments [Member] | Infrastructure Solutions [Member] | Employee Severance [Member]
Restructuring charges	118		551		118		833
Operating Segments [Member] | Infrastructure Solutions [Member] | Contract Termination [Member]
Restructuring charges	36		(92)		36		333
Operating Segments [Member] | Infrastructure Solutions [Member] | Employee Relocation [Member]
Restructuring charges	0		0		0		51
Operating Segments [Member] | Infrastructure Solutions [Member] | Other Restructuring [Member]
Restructuring charges	(199)	[5]	1,696	[5]	162	[6]	3,440	[6]
Operating Segments [Member] | Corrosion Protection [Member]
Restructuring charges	484		3,449		2,380		3,425
Operating Segments [Member] | Corrosion Protection [Member] | Cost of Revenues [Member]
Restructuring charges	(131)		463		175		562
Operating Segments [Member] | Corrosion Protection [Member] | Operating Expense [Member]
Restructuring charges	1,091		331		1,642		268
Operating Segments [Member] | Corrosion Protection [Member] | Goodwill Impairment [Member]
Restructuring charges	0		0		0		0
Operating Segments [Member] | Corrosion Protection [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges	0		0		0		0
Operating Segments [Member] | Corrosion Protection [Member] | Restructuring and Related Charges [Member]
Restructuring charges	384		2,509		1,301		2,696
Operating Segments [Member] | Corrosion Protection [Member] | Other Expense [Member]
Restructuring charges	(860)		146		(738)		(101)
Operating Segments [Member] | Corrosion Protection [Member] | Employee Severance [Member]
Restructuring charges	106		1,575		969		1,745
Operating Segments [Member] | Corrosion Protection [Member] | Contract Termination [Member]
Restructuring charges	175		790		229		807
Operating Segments [Member] | Corrosion Protection [Member] | Employee Relocation [Member]
Restructuring charges	103		144		103		144
Operating Segments [Member] | Corrosion Protection [Member] | Other Restructuring [Member]
Restructuring charges	100	[5]	940	[5]	1,079	[6]	729	[6]
Operating Segments [Member] | Energy Services [Member]
Restructuring charges	3,454		6		3,550		40
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	1,170		0		1,170		0
Operating Segments [Member] | Energy Services [Member] | Goodwill Impairment [Member]
Restructuring charges	1,258		0		1,258		0
Operating Segments [Member] | Energy Services [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges	957		0		957		0
Operating Segments [Member] | Energy Services [Member] | Restructuring and Related Charges [Member]
Restructuring charges	69		6		165		40
Operating Segments [Member] | Energy Services [Member] | Other Expense [Member]
Restructuring charges	0		0		0		0
Operating Segments [Member] | Energy Services [Member] | Employee Severance [Member]
Restructuring charges	69		6		69		40
Operating Segments [Member] | Energy Services [Member] | Contract Termination [Member]
Restructuring charges	0		0		62		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	3,385	[5]	0	[5]	3,385	[6]	0	[6]
Corporate, Non-Segment [Member]
Restructuring charges	940		906		2,210		1,260
Corporate, Non-Segment [Member] | Cost of Revenues [Member]
Restructuring charges	0		0		0		0
Corporate, Non-Segment [Member] | Operating Expense [Member]
Restructuring charges	838		898		1,219		1,145
Corporate, Non-Segment [Member] | Goodwill Impairment [Member]
Restructuring charges	0		0		0		0
Corporate, Non-Segment [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges	0		0		0		0
Corporate, Non-Segment [Member] | Restructuring and Related Charges [Member]
Restructuring charges	57		0		332		107
Corporate, Non-Segment [Member] | Other Expense [Member]
Restructuring charges	45		8		659		8
Corporate, Non-Segment [Member] | Employee Severance [Member]
Restructuring charges	57		0		332		9
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	$ 883	[5]	$ 906	[5]	$ 1,878	[6]	$ 1,153	[6]
[1]	Total pre-tax restructuring charges for the quarter ended June 30, 2020, include cash charges of $2.6 million and non-cash charges of $2.2 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[2]	Total pre-tax restructuring charges for the quarter ended June 30, 2019, include cash charges of $5.4 million and non-cash charges of $1.1 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 six months ended June 30, 2020, include cash charges of $5.8 million and non-cash charges of $2.7 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 six months ended June 30, 2019, include cash charges of $8.5 million and non-cash charges of $0.9 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 June 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 quarter ended June 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 six months ended June 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 six months ended June 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				6 Months Ended				35 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020
Restructuring reserve, balance					$ 8,088		$ 2,412
Restructuring charges	$ 4,833	[1]	$ 6,516	[2]	8,456	[3]	9,382	[4]
Restructuring reserve, foreign currency translation					(50)		(27)
Restructuring reserve, settled with cash					9,681	[5]	5,942	[6]	$ 51,100
Restructuring reserve, settled without cash					2,718		1,409
Restructuring reserve, balance	4,095		4,416		4,095		4,416		4,095
Employee Severance [Member]
Restructuring reserve, balance					4,389		1,742
Restructuring charges	350		2,132		1,488		2,627
Restructuring reserve, foreign currency translation					(21)		(10)
Restructuring reserve, settled with cash					4,104	[5]	1,860	[6]
Restructuring reserve, settled without cash					0		0
Restructuring reserve, balance	1,752		2,499		1,752		2,499		1,752
Contract Termination [Member]
Restructuring reserve, balance					953		359
Restructuring charges	211		698		327		1,238
Restructuring reserve, foreign currency translation					(7)		(13)
Restructuring reserve, settled with cash					575	[5]	606	[6]
Restructuring reserve, settled without cash					0		0
Restructuring reserve, balance	698		978		698		978		698
Employee Relocation [Member]
Restructuring reserve, balance					367		0
Restructuring charges	103		144		137		195
Restructuring reserve, foreign currency translation					0		(1)
Restructuring reserve, settled with cash					211	[5]	26	[6]
Restructuring reserve, settled without cash					0		0
Restructuring reserve, balance	293		168		293		168		293
Other Restructuring [Member]
Restructuring reserve, balance					2,379		311
Restructuring charges	4,169	[7]	3,542	[7]	6,504	[8]	5,322	[8]
Restructuring reserve, foreign currency translation					(22)		(3)
Restructuring reserve, settled with cash					4,791	[5]	3,450	[6]
Restructuring reserve, settled without cash					2,718		1,409
Restructuring reserve, balance	$ 1,352		$ 771		$ 1,352		$ 771		$ 1,352
[1]	Total pre-tax restructuring charges for the quarter ended June 30, 2020, include cash charges of $2.6 million and non-cash charges of $2.2 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[2]	Total pre-tax restructuring charges for the quarter ended June 30, 2019, include cash charges of $5.4 million and non-cash charges of $1.1 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 six months ended June 30, 2020, include cash charges of $5.8 million and non-cash charges of $2.7 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 six months ended June 30, 2019, include cash charges of $8.5 million and non-cash charges of $0.9 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 six months of 2020.
[6]	Refers to cash utilized to settle charges during the first six months of 2019.
[7]	For the quarter ended June 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 quarter ended June 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 six months ended June 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 six months ended June 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	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 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	6 Months Ended			12 Months Ended
	Jun. 30, 2020		Jun. 30, 2019	Dec. 31, 2019
Disposal Group, Including Discontinued Operation, Contract Assets, Current	$ 700			$ 5,400
Total current assets	10,367			16,092
Impairment of assets held for sale	0		$ (11,946)
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current	100			100
Total current liabilities	1,448			6,485
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Receivables, net	266	[1]		4,136	[2]
Retainage	463	[1]		518	[2]
Disposal Group, Including Discontinued Operation, Contract Assets, Current	698	[1]		5,350	[2]
Inventories	141	[1]		2,097	[2]
Prepaid expenses and other current assets	194	[1]		799	[2]
Total current assets	1,762	[1]		12,900	[2]
Property, plant & equipment, less accumulated depreciation	7,233	[1]		10,962	[2]
Goodwill	2,640	[1]		4,224	[2]
Intangible assets, less accumulated amortization	1,429	[1]		1,528	[2]
Operating lease assets	42	[1]		326	[2]
Other non-current assets	122	[1]		130	[2]
Impairment of assets held for sale	(2,861)	[1]		(13,978)	[2]
Total assets held for sale	10,367	[1]		16,092	[2]
Accounts payable	280	[1]		2,174	[2]
Accrued expenses	1,072	[1]		3,961	[2]
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current	43	[1]		122	[2]
Total current liabilities	1,395	[1]		6,257	[2]
Operating lease liabilities	6	[1]		174	[2]
Other non-current liabilities	47	[1]		54	[2]
Total liabilities held for sale	$ 1,448	[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	Jun. 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	$ 0.1	$ 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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating lease cost	$ 4,932	$ 5,938	$ 10,138	$ 11,390
Short-term lease cost	4,785	5,482	10,866	12,721
Total lease cost	$ 9,717	$ 11,420	$ 21,004	$ 24,111

Note 6 - Leases - Supplement Fi

Note 6 - Leases - Supplement Financial Statement Disclosure (Details) - USD ($) $ in Thousands	Jun. 30, 2020		Dec. 31, 2019
Operating lease assets	$ 69,701	[1]	$ 71,466	[2]
Other liabilities	$ 55,455		$ 56,253
Weighted-average remaining lease term (Year)	5 years 10 months 9 days	[1]	5 years 8 months 26 days	[2]
Weighted-average discount rate	5.12%	[1]	5.71%	[2]
Accrued Expense [Member]
Accrued expenses	$ 15,378	[1]	$ 15,828	[2]
Other Liabilities [Member]
Other liabilities	55,455	[1]	56,253	[2]
Accrued Expense and Other Liabilities [Member]
Total operating lease liabilities	$ 70,833	[1]	$ 72,081	[2]
[1]	Amounts exclude operating lease assets of less than $0.1 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 June 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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Goodwill, Impairment Loss	$ 1,258	$ 0	$ 1,258	[1]	$ 0
Impairment of Intangible Assets, Finite-lived	957	0	957		0
Amortization of Intangible Assets, Total	3,400	$ 3,400	6,800		$ 6,900
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year	13,000		13,000
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	12,900		12,900
Finite-Lived Intangible Asset, Expected Amortization, Year Five	12,100		12,100
Energy Services [Member]
Goodwill, Impairment Loss	1,300		1,258	[1]
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 in Energy Services (see Note 4).

Note 7 - Goodwill and Intangi_4

Note 7 - Goodwill and Intangible Assets - Reconciliation Goodwill (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019	Dec. 31, 2019
Goodwill, gross		$ 397,787		$ 397,787			$ 398,610
Accumulated impairment losses		(143,033)		(143,033)			(141,775)
Goodwill, net		254,754		254,754			256,835
Impairment (1)		(1,258)	$ 0	(1,258)	[1]	$ 0
Foreign currency translation				(823)
Infrastructure Solutions [Member]
Goodwill, gross		239,724		239,724			240,160
Accumulated impairment losses		(62,848)		(62,848)			(62,848)
Goodwill, net		176,876		176,876			177,312
Impairment (1)	[1]			0
Foreign currency translation				(436)
Corrosion Protection [Member]
Goodwill, gross		76,559		76,559			76,946
Accumulated impairment losses		(45,400)		(45,400)			(45,400)
Goodwill, net		31,159		31,159			31,546
Impairment (1)	[1]			0
Foreign currency translation				(387)
Energy Services [Member]
Goodwill, gross		81,504		81,504			81,504
Accumulated impairment losses		(34,785)		(34,785)			(33,527)
Goodwill, net		46,719		46,719			$ 47,977
Impairment (1)		$ (1,300)		(1,258)	[1]
Foreign currency translation				$ 0
[1]	During the second quarter of 2020, the Company recorded a $1.3 million goodwill impairment related to restructuring activities in Energy Services (see Note 4).

Note 7 - Goodwill and Intangi_5

Note 7 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2020	Dec. 31, 2019
Gross carrying amount		$ 217,788	$ 219,623
Accumulated amortization		(120,645)	(114,795)
Net carrying amount		$ 97,143	104,828
Licensing Agreements [Member]
Weighted average useful lives (Year)		2 months 12 days
Gross carrying amount		$ 3,894	3,894
Accumulated amortization		(3,871)	(3,824)
Net carrying amount		$ 23	70
Lease Agreements [Member]
Weighted average useful lives (Year)		6 months
Gross carrying amount		$ 864	864
Accumulated amortization		(820)	(777)
Net carrying amount		$ 44	87
Trademarks [Member]
Weighted average useful lives (Year)	[1]	9 years 2 months 12 days
Gross carrying amount	[1]	$ 15,437	15,699
Accumulated amortization	[1]	(7,261)	(6,911)
Net carrying amount	[1]	$ 8,176	8,788
Noncompete Agreements [Member]
Weighted average useful lives (Year)		2 years 10 months 24 days
Gross carrying amount		$ 2,048	2,301
Accumulated amortization		(1,391)	(1,354)
Net carrying amount		$ 657	947
Customer Relationships [Member]
Weighted average useful lives (Year)	[1]	6 years 10 months 24 days
Gross carrying amount	[1]	$ 156,817	157,576
Accumulated amortization	[1]	(81,931)	(76,832)
Net carrying amount	[1]	$ 74,886	80,744
Patents [Member]
Weighted average useful lives (Year)		7 years 3 months 18 days
Gross carrying amount		$ 38,728	39,289
Accumulated amortization		(25,371)	(25,097)
Net carrying amount		$ 13,357	$ 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	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2021	Feb. 28, 2023	Dec. 31, 2019	Mar. 12, 2018	Oct. 31, 2015
Long-term Debt, Total		$ 262,931	$ 262,931				$ 278,520
Payments of Financing Costs, Total			1,995	$ 0
Long-term Debt, Fair Value		274,000	274,000				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		236,300	236,300				253,800
A 2015 Credit Facility [Member]
Debt Instrument, Face Amount									$ 650,000
Line of Credit Facility, Maximum Borrowing Capacity									350,000
Long-term Line of Credit, Total		26,000	26,000				24,000
Other Loans Payable, Total		700	700				$ 800
Letters of Credit Outstanding, Amount		$ 35,000	$ 35,000
Derivative, Amount of Hedged Item									$ 262,500
Credit Facility Maximum Consolidated Leverage Ratio		4	4
Credit Facility Actual Consolidated Leverage Ratio		2.65	2.65
Line of Credit Facility, Remaining Borrowing Capacity		$ 140,000	$ 140,000
Credit Facility Minimum Consolidated Fixed Charge Ratio		1.10	1.10
Credit Facility Actual Consolidated Fixed Charge Ratio		1.41	1.41
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		5.11%	5.11%
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
Proceeds from Lines of Credit, Total		32,000
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		12,200	12,200
A 2015 Credit Facility [Member] | Working Performance Obligation [Member]
Letters of Credit Outstanding, Amount		$ 22,800	$ 22,800

Note 8 - Long-term Debt and C_4

Note 8 - Long-term Debt and Credit Facility - Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long term debt	$ 262,931	$ 278,520
Less – Current maturities of long-term debt	26,780	32,803
Less – Unamortized loan costs	3,054	2,088
Total	233,097	243,629
Medium-term Notes [Member]
Long term debt	236,250	253,750
Line of Credit [Member]
Long term debt	26,000	24,000
Notes Payable, Other Payables [Member]
Long term debt	$ 681	$ 770

Note 9 - Stockholders' Equity_3

Note 9 - Stockholders' Equity and Equity Compensation (Details Textual) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020USD ($)shares	Jun. 30, 2019USD ($)	Mar. 31, 2019$ / sharesshares	Jun. 30, 2020USD ($)$ / sharesshares	Jun. 30, 2019USD ($)$ / sharesshares	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)	1,370,669			1,370,669
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)	257,396			257,396
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 | $	$ 2.3	$ 2		$ 4	$ 4
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $	15.9			$ 15.9
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 10 months 24 days
Deferred Stock Units [Member]
Share-based Payment Arrangement, Expense | $	0.2	$ 0.2		$ 0.4	$ 0.2
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $	$ 0.8			$ 0.8
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				9 months 18 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			$ 10
Stock Repurchased During Period, Shares (in shares)				83,737	153,630
Stock Repurchased During Period, Value | $				$ 1.9	$ 3.1
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares				$ 22.54	$ 20.48
Through The Open Market Repurchase Program [Member]
Stock Repurchased During Period, Shares (in shares)				180,491	1,274,086
Stock Repurchased During Period, Value | $				$ 3.2	$ 22
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares				$ 17.80	$ 17.28

Note 9 - Stockholders' Equity_4

Note 9 - Stockholders' Equity and Equity Compensation - Summary of Stock Award Activity (Details)	6 Months Ended
	Jun. 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	1,192,594
Weighted average award date fair value (in dollars per share) | $ / shares	$ 21.76
Restricted Stock Units (RSUs) [Member]
Awards, grants during period (in shares) | shares	391,171
Weighted average award date fair value, award granted (in dollars per share) | $ / shares	$ 20.02
Awards, distributed during period (in shares) | shares	(188,545)
Weighted average award date fair value, award distributed (in dollars per share) | $ / shares	$ 22.30
Awards, forfeited during period (in shares) | shares	(28,928)
Weighted average award date fair value, award forfeited (in dollars per share) | $ / shares	$ 21.07
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)	6 Months Ended
	Jun. 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	1,192,594
Weighted average award date fair value (in dollars per share) | $ / shares	$ 21.76
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	64,010
Weighted average award date fair value, award granted (in dollars per share) | $ / shares	$ 14.55
Awards, distributed during period (in shares) | shares	(56,582)
Weighted average award date fair value, award distributed (in dollars per share) | $ / shares	$ 21.63
Stock Awards, Outstanding (in shares) | shares	260,768
Weighted average award date fair value (in dollars per share) | $ / shares	$ 19

Note 10 - Taxes on Income (Deta

Note 10 - Taxes on Income (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Effective Income Tax Rate Reconciliation, Percent, Total	23.40%	(111.00%)	33.80%	(40.90%)
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				6 Months Ended
		Jun. 30, 2020USD ($)		Jun. 30, 2019USD ($)		Jun. 30, 2020USD ($)		Jun. 30, 2019USD ($)
Number of Reportable Segments						3
Impairment of Long-Lived Assets to be Disposed of						$ 0		$ 11,946
Goodwill, Impairment Loss		$ 1,258		$ 0		1,258	[1]	0
Impairment of Intangible Assets, Finite-lived		957		0		957		0
Infrastructure Solutions [Member]
Impairment of Long-Lived Assets to be Disposed of						700		9,000
Goodwill, Impairment Loss	[1]					0
Corrosion Protection [Member]
Impairment of Long-Lived Assets to be Disposed of								2,900
Goodwill, Impairment Loss	[1]					0
Energy Services [Member]
Goodwill, Impairment Loss		1,300				1,258	[1]
Impairment of Intangible Assets, Finite-lived						1,000
Restructuring 2017 [Member]
Restructuring Charges, Total		4,833	[2]	6,516	[3]	8,456	[4]	9,382	[5]
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Infrastructure Solutions [Member]
Restructuring Charges, Total		100		1,400		500		3,400
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Infrastructure Solutions [Member] | Divestiture of International Operations [Member]
Restructuring Charges, Total		0		400		200		500
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corrosion Protection [Member]
Restructuring Charges, Total		1,300		3,300		3,100		3,500
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Energy Services [Member]
Restructuring Charges, Total		3,500		100		3,600		100
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corporate Segment [Member]
Restructuring Charges, Total		900		900		1,600		1,300
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corporate Segment [Member] | Divestiture of International Operations [Member]
Restructuring Charges, Total		700		400		1,300		400
Restructuring 2017 [Member] | Other Nonoperating Income (Expense) [Member]
Restructuring Charges, Total		$ 900		$ 900		300		$ 1,100
Restructuring 2017 [Member] | Other Nonoperating Income (Expense) [Member] | Divestiture of International Operations [Member]
Restructuring Charges, Total						$ 700
[1]	During the second quarter of 2020, the Company recorded a $1.3 million goodwill impairment related to restructuring activities in Energy Services (see Note 4).
[2]	Total pre-tax restructuring charges for the quarter ended June 30, 2020, include cash charges of $2.6 million and non-cash charges of $2.2 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[3]	Total pre-tax restructuring charges for the quarter ended June 30, 2019, include cash charges of $5.4 million and non-cash charges of $1.1 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 six months ended June 30, 2020, include cash charges of $5.8 million and non-cash charges of $2.7 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 six months ended June 30, 2019, include cash charges of $8.5 million and non-cash charges of $0.9 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		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	[1]	$ 245,017	$ 318,740	$ 532,392	$ 595,644
Gross profit	[1]	53,575	67,437	103,459	115,732
Total operating income (loss)		8,727	459	10,123	(315)
Interest expense		(4,690)	(3,566)	(7,886)	(7,156)
Interest income		215	261	443	546
Other	[2]	964	(1,015)	1,389	(1,689)
Total other expense		(3,511)	(4,320)	(6,054)	(8,299)
Income (loss) before taxes on income		5,216	(3,861)	4,069	(8,614)
UNITED STATES
Revenues	[1]	197,447	239,987	430,667	448,762
Gross profit	[1]	41,334	50,792	80,970	82,619
CANADA
Revenues	[1]	24,995	33,392	46,850	57,460
Gross profit	[1]	5,369	5,028	8,100	8,482
Europe [Member]
Revenues	[1]	7,192	17,381	17,863	33,384
Gross profit	[1]	2,256	3,311	5,204	6,830
Other Foreign Countries [Member]
Revenues	[1]	15,383	27,980	37,012	56,038
Gross profit	[1]	4,616	8,306	9,185	17,801
Infrastructure Solutions [Member]
Revenues		137,392	155,440	267,636	286,983
Infrastructure Solutions [Member] | UNITED STATES
Revenues		114,705	110,957	218,123	208,848
Infrastructure Solutions [Member] | CANADA
Revenues		14,205	18,934	25,228	29,545
Infrastructure Solutions [Member] | Europe [Member]
Revenues		4,131	12,888	11,773	25,413
Infrastructure Solutions [Member] | Other Foreign Countries [Member]
Revenues		4,351	12,661	12,512	23,177
Corrosion Protection [Member]
Revenues		55,491	77,596	121,559	142,094
Corrosion Protection [Member] | UNITED STATES
Revenues		30,608	43,326	69,347	73,347
Corrosion Protection [Member] | CANADA
Revenues		10,790	14,458	21,622	27,915
Corrosion Protection [Member] | Europe [Member]
Revenues		3,061	4,493	6,090	7,971
Corrosion Protection [Member] | Other Foreign Countries [Member]
Revenues		11,032	15,319	24,500	32,861
Energy Services [Member]
Revenues		52,134	85,704	143,197	166,567
Energy Services [Member] | UNITED STATES
Revenues		52,134	85,704	143,197	166,567
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		137,392	155,439	267,636	286,982
Gross profit		35,667	38,871	67,037	65,457
Total operating income (loss)	[3]	21,004	9,120	34,559	14,835
Operating Segments [Member] | Corrosion Protection [Member]
Revenues		55,491	77,597	121,559	142,095
Gross profit		14,111	16,692	23,028	29,565
Total operating income (loss)	[4]	699	(3,863)	(5,748)	(5,623)
Operating Segments [Member] | Energy Services [Member]
Revenues		52,134	85,704	143,197	166,567
Gross profit		3,797	11,874	13,394	20,710
Total operating income (loss)	[5]	(5,713)	4,107	(3,537)	5,222
Corporate, Non-Segment [Member]
Total operating income (loss)	[6]	$ (7,263)	$ (8,905)	$ (15,151)	$ (14,749)
[1]	Revenues and gross profit are attributed to the country of origin
[2]	Other expense in the second quarter of 2020 includes gains of $0.9 million related to restructuring (see Note 4). Other expense in the second quarter of 2019 includes $0.9 million of restructuring charges (see Note 4). Other expense in the first six months of 2020 and 2019 includes gains of $0.3 million and charges of $1.1 million, respectively, related to restructuring (see Note 4). Other expense in the first six months of 2020 also includes gains of $0.7 million related to divestitures of Insituform Australia and Insituform Spain (see Note 1).
[3]	Operating income in the second quarter of 2020 and 2019 includes $0.1 million and $1.4 million, respectively, of restructuring charges (see Note 4) and $0.0 million and $0.4 million, respectively, of costs primarily related to the divestiture of certain international operations. Operating income in the first six months of 2020 and 2019 includes $0.5 million and $3.4 million, respectively, of restructuring charges (see Note 4) and $0.2 million and $0.5 million, respectively, of divestiture costs. Additionally, operating income in the second quarter and first six months of 2020 includes $0.7 million of impairment reversals while operating income in the second quarter and first six months of 2019 includes $9.0 million of impairment charges to assets held for sale.
[4]	Operating income (loss) in the second quarter of 2020 and 2019 includes $1.3 million and $3.3 million, respectively, of restructuring charges (see Note 4). Operating loss in the first six months of 2020 and 2019 includes $3.1 million and $3.5 million, respectively, of restructuring charges (see Note 4). Additionally, operating income in the second quarter and first six months of 2019 includes $2.9 million of impairment charges to assets held for sale.
[5]	Operating loss in the second quarter of 2020 and 2019 includes $3.5 million and less than $0.1 million, respectively, of restructuring charges (see Note 4). Operating loss in the first six months of 2020 and 2019 includes $3.6 million and less than $0.1 million respectively, of restructuring charges (see Note 4). Additionally, operating loss in the second quarter and first six months of 2020 includes $1.3 million of goodwill impairment charges and $1.0 million of definite-lived intangible asset impairment charges.
[6]	Operating loss in the second quarter of 2020 and 2019 includes $0.9 million and $0.9 million, respectively, of restructuring charges (see Note 4) and $0.7 million and $0.4 million, respectively, of divestiture costs. Operating loss in the first six months of 2020 and 2019 includes $1.6 million and $1.3 million, respectively, of restructuring charges (see Note 4) and $1.3 million and $0.4 million, respectively, of divestiture costs.

Note 13 - Derivative Financia_3

Note 13 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Mar. 12, 2018	Oct. 31, 2015
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ (300)
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		$ (10,696)	$ (4,638)
Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, Total		$ (10,700)	$ (4,600)

Note 13 - Derivative Financia_4

Note 13 - Derivative Financial Instruments - Summary of Derivative Positions (Details) - Interest Rate Swap [Member]	6 Months Ended
	Jun. 30, 2020USD ($)
Notional amount	$ 177,187,500
Weighted average remaining maturities (Year)	2 years 6 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	Jun. 30, 2020	Dec. 31, 2019
Derivative assets	$ 0	$ 261
Derivative liabilities	10,696	4,899
Net Derivative Asset (Liability)	(10,696)	(4,638)
Other Noncurrent Assets [Member] | Interest Rate Swap [Member]
Derivative assets	0	261
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member]
Derivative liabilities	$ 10,696	$ 4,899