Aegion 10-Q 1 May 20 2020 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2020	Apr. 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	Q1
Document Fiscal Year Focus	2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 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		30,683,557

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Revenues	[1]	$ 287,375	$ 276,904
Cost of revenues		237,491	228,609
Gross profit	[1]	49,884	48,295
Operating expenses		46,348	47,870
Acquisition and divestiture expenses		852	113
Restructuring and related charges		1,288	1,086
Operating income (loss)		1,396	(774)
Other income (expense):
Interest expense		(3,196)	(3,590)
Interest income		228	285
Other	[2]	425	(674)
Total other expense		(2,543)	(3,979)
Loss before taxes on income		(1,147)	(4,753)
Taxes (benefit) on loss		156	(762)
Net loss		(1,303)	(3,991)
Non-controlling interests income		(329)	(10)
Net loss attributable to Aegion Corporation		$ (1,632)	$ (4,001)
Loss per share attributable to Aegion Corporation:
Basic (in dollars per share)		$ (0.05)	$ (0.13)
Diluted (in dollars per share)		$ (0.05)	$ (0.13)
[1]	Revenues and gross profit are attributed to the country of origin
[2]	Other expense in the first quarters of 2020 and 2019 includes $0.6 million and $0.2 million of restructuring charges (see Note 4). Other expense in the first quarter of 2020 also includes gains of $0.4 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
		Mar. 31, 2020	Mar. 31, 2019
Net loss		$ (1,303)	$ (3,991)
Other comprehensive income (loss):
Currency translation adjustments		(4,637)	1,862
Deferred loss on hedging activity, net of tax (1)	[1]	(5,936)	(2,146)
Pension activity, net of tax	[2]	57	(21)
Total comprehensive loss		(11,819)	(4,296)
Comprehensive (income) loss attributable to non-controlling interests		(66)	77
Comprehensive loss attributable to Aegion Corporation		$ (11,885)	$ (4,219)
[1]	Amounts presented net of tax of $164, $(48) and $930 for the years ended December 31, 2019, 2018 and 2017, respectively.
[2]	Amounts presented net of tax of $8, $(134) and $22 for the years ended December 31, 2019, 2018 and 2017, respectively.

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020		Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 73,210		$ 64,874
Restricted cash	1,070		1,348
Receivables, net of allowances of $6,335 and $7,224, respectively	195,610		192,604
Retainage	30,400		33,103
Contract assets	55,978	[1]	51,092	[2]
Inventories	51,336		57,193
Prepaid expenses and other current assets	35,081		33,909
Assets held for sale	11,715		16,092
Total current assets	454,400		450,215
Property, plant & equipment, less accumulated depreciation	100,641		101,091
Other assets
Goodwill	255,209		256,835
Intangible assets, less accumulated amortization	101,383		104,828
Operating lease assets	68,718	[3]	71,466	[4]
Deferred income tax assets	454		1,216
Other non-current assets	8,403		9,862
Total other assets	434,167		444,207
Total Assets	989,208		995,513
Current liabilities
Accounts payable	58,413		60,614
Accrued expenses	83,175		96,577
Contract liabilities	39,480	[1]	37,562	[2]
Current maturities of long-term debt	29,735		32,803
Liabilities held for sale	1,648		6,485
Total current liabilities	212,451		234,041
Long-term debt, less current maturities	272,010		243,629
Other liabilities
Operating lease liabilities	54,985		56,253
Deferred income tax liabilities	10,132		11,254
Other non-current liabilities	19,401		15,243
Total other liabilities	84,518		82,750
Total liabilities	568,979		560,420
(See Commitments and Contingencies: Note 11)
Equity
Preferred stock, undesignated, $.10 par – shares authorized 2,000,000; none outstanding	0		0
Common stock, $.01 par – shares authorized 125,000,000; shares issued and outstanding 30,679,476 and 30,715,959, respectively	307		307
Additional paid-in capital	98,103		101,148
Retained earnings	357,366		358,998
Accumulated other comprehensive loss	(42,947)		(32,694)
Total stockholders’ equity	412,829		427,759
Non-controlling interests	7,400		7,334
Total equity	420,229		435,093
Total Liabilities and Equity	$ 989,208		$ 995,513
[1]	Amounts exclude contract assets of $1.8 million and contract liabilities of less than $0.1 million that were classified as held for sale at March 31, 2020 (see Note 5).
[2]	Amounts exclude contract assets of $5.4 million and contract liabilities of $0.2 million that were classified as held for sale at December 31, 2019 (see Note 5).
[3]	Amounts exclude operating lease assets of $0.1 million and other liabilities of less than $0.1 million that were classified as held for sale at March 31, 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	Mar. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts receivable	$ 6,335	$ 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)	30,679,476	30,715,959
Common stock, shares outstanding (in shares)	30,679,476	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							52,783
Issuance of shares pursuant to restricted stock units (in shares)	171,575	110,656
Issuance of shares pursuant to deferred stock units (in shares)			9,438
Shares repurchased and retired (in shares)			(774,989)
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
Issuance of common stock upon stock option exercises			1	955						956
Issuance of shares pursuant to restricted stock units	$ 2	$ 1						$ 2	$ 1
Shares repurchased and retired			(8)	(14,183)						(14,191)
Balance, end of period at Mar. 31, 2019			$ 315	111,597	375,889	(40,508)	7,277			454,570
Equity-based compensation expense				2,007						2,007
Net income (loss)					(4,001)		10			(3,991)
Currency translation adjustment and derivative transactions, net						(218)	(87)			(305)
Net income (loss)					(4,001)		10			(3,991)
Distributions to non-controlling interests							(96)			(96)
Net loss					(4,001)		10			$ (3,991)
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)	152,596	71,541
Issuance of shares pursuant to deferred stock units (in shares)			0
Shares repurchased and retired (in shares)			(260,620)
Balance, end of period (in shares) at Mar. 31, 2020			30,679,476							30,679,476
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
Shares repurchased and retired			(3)	(5,045)						(5,048)
Balance, end of period at Mar. 31, 2020			$ 307	98,103	357,366	(42,947)	7,400			420,229
Equity-based compensation expense				$ 2,000						2,000
Net income (loss)					(1,632)		329			(1,303)
Currency translation adjustment and derivative transactions, net						$ (10,253)	(263)			(10,516)
Net income (loss)					(1,632)		329			(1,303)
Distributions to non-controlling interests							0			0
Net loss					$ (1,632)		$ 329			$ (1,303)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (1,303)	$ (3,991)
Adjustments to reconcile to net cash used in operating activities:
Depreciation and amortization	9,105	8,655
Gain on sale of fixed assets	(32)	(308)
Equity-based compensation expense	2,000	2,007
Deferred income taxes	(866)	19
Non-cash restructuring charges	463	(151)
Gain on sale of businesses	(436)	0
(Gain) loss on foreign currency transactions	(588)	772
Other	145	63
Changes in operating assets and liabilities (net of acquisitions):
Receivables net, retainage and contract assets	(10,013)	10,388
Inventories	4,431	(1,287)
Prepaid expenses and other assets	(1,346)	433
Accounts payable and accrued expenses	(11,922)	(18,017)
Contract liabilities	2,419	(4,307)
Other operating	(176)	(873)
Net cash used in operating activities	(8,119)	(6,597)
Cash flows from investing activities:
Capital expenditures	(6,134)	(8,064)
Proceeds from sale of fixed assets	125	293
Patent expenditures	(86)	(69)
Sale of businesses, net of cash disposed	3,358	0
Net cash used in investing activities	(2,737)	(7,840)
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises	0	956
Repurchase of common stock	(5,045)	(14,220)
Distributions to non-controlling interests	0	(96)
Payments on notes payable, net	0	(138)
Proceeds from line of credit, net	34,000	13,000
Principal payments on long-term debt	(8,750)	(6,563)
Net cash provided by (used in) financing activities	20,205	(7,061)
Effect of exchange rate changes on cash	(1,291)	329
Net increase (decrease) in cash, cash equivalents and restricted cash for the period	8,058	(21,169)
Cash, cash equivalents and restricted cash, beginning of year	66,222	84,886
Cash, cash equivalents and restricted cash, end of period	$ 74,280	$ 63,717

Note 1 - General

Note 1 - General	3 Months Ended
	Mar. 31, 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, March 31, 2020 December 31, 2019. 19 5.

Note 2 - Accounting Policies

Note 2 - Accounting Policies	3 Months Ended
	Mar. 31, 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 March 31, 2020 December 31, 2019 Currency translation adjustments (1) $ (31,615 ) $ (27,241 ) Derivative hedging activity (10,458 ) (4,522 ) Pension activity (874 ) (931 ) Total accumulated other comprehensive loss $ (42,947 ) $ (32,694 ) ( 1 During the quarter ended March 31, 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 gain of $0.6 million and loss of ($0.8) million in the first 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 March 31, 2020 2019 Weighted average number of common shares used for basic EPS 30,716,802 31,704,923 Effect of dilutive stock options and restricted and deferred stock unit awards — — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 30,716,802 31,704,923 The Company excluded 553,766 and 549,679 restricted and deferred stock units for the quarters ended March 31, 2020 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 March 31, 2020 December 31, 2019 Cash and cash equivalents $ 73,210 $ 64,874 Restricted cash 1,070 1,348 Cash, cash equivalents and restricted cash $ 74,280 $ 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; however, the Company does not 2 no 1, 2 3 March 31, 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 March 31, 2020 Financial data for consolidated variable interest entities are summarized in the following tables (in thousands): Balance sheet data March 31, 2020 December 31, 2019 Current assets $ 16,424 $ 18,304 Non-current assets 7,956 7,635 Current liabilities 6,230 8,261 Non-current liabilities 2,744 1,962 Quarter Ended March 31, Statement of operations data 2020 2019 Revenue $ 7,729 $ 5,925 Gross profit 2,303 1,635 Net income attributable to Aegion Corporation 285 33 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	3 Months Ended
	Mar. 31, 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 90.8% and 92.9% of revenues for the quarters ended March 31, 2020 2019, 606 55 255, not March 31, 2020 2019, On March 31, 2020, March 31, 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 March 31, 2020 Quarter Ended March 31, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Geographic region: United States $ 103,418 $ 38,739 $ 91,063 $ 233,220 $ 97,891 $ 30,021 $ 80,863 $ 208,775 Canada 11,023 10,832 — 21,855 10,611 13,457 — 24,068 Europe 7,642 3,029 — 10,671 12,525 3,478 — 16,003 Other foreign 8,161 13,468 — 21,629 10,516 17,542 — 28,058 Total revenues $ 130,244 $ 66,068 $ 91,063 $ 287,375 $ 131,543 $ 64,498 $ 80,863 $ 276,904 The following tables summarize revenues by segment and contract type (in thousands): Quarter Ended March 31, 2020 Quarter Ended March 31, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Contract type: Fixed fee $ 112,511 $ 44,255 $ 1,730 $ 158,496 $ 118,915 $ 42,572 $ 919 $ 162,406 Time and materials — 12,970 89,333 102,303 — 14,977 79,944 94,921 Product sales 17,733 8,843 — 26,576 12,478 6,949 — 19,427 License fees — — — — 150 — — 150 Total revenues $ 130,244 $ 66,068 $ 91,063 $ 287,375 $ 131,543 $ 64,498 $ 80,863 $ 276,904 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): March 31, 2020 (1) December 31, 2019 (2) Contract assets – current $ 55,978 $ 51,092 Contract liabilities – current (39,480 ) (37,562 ) Net contract assets $ 16,498 $ 13,530 ( 1 Amounts exclude contract assets of $1.8 million and contract liabilities of less than $0.1 million that were classified as held for sale at March 31, 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 2020 2019

Note 4 - Restructuring

Note 4 - Restructuring	3 Months Ended
	Mar. 31, 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. 2020 19, As part of efforts to optimize the cathodic protection operations in North America, management initiated plans during the fourth 2019 three 2019. fourth 2019, Total pre-tax restructuring and related impairment charges since inception were $175.6 2017 The Company is substantially complete with respect to its announced restructuring efforts and expects any future cash charges related to this program to be immaterial. However, the Company could incur additional non-cash charges primarily associated with the release of cumulative currency translation adjustments and losses on the closure or liquidation of international entities. Management will continue to evaluate impacts on the business as a result of the COVID- 19 During the quarters ended March 31, 2020 2019 Quarter Ended March 31, 2020 Quarter Ended March 31, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Severance and benefit related costs $ — $ 863 $ — $ 275 $ 1,138 $ 282 $ 170 $ 34 $ 9 $ 495 Contract termination costs — 54 62 — 116 425 17 — 98 540 Relocation and other moving costs — — 34 — 34 51 — — — 51 Other restructuring costs (1) 361 979 — 995 2,335 1,744 (211 ) — 247 1,780 Total pre-tax restructuring charges $ 361 $ 1,896 $ 96 $ 1,270 $ 3,623 $ 2,502 $ (24 ) $ 34 $ 354 $ 2,866 ( 1 For the quarter ended March 31, 2020 March 31, 2019 Restructuring costs related to severance, other termination benefit costs and early contract termination costs were $1.3 million and $1.1 million for the quarters ended March 31, 2020 2019 The following tables summarize all charges related to the Restructuring recognized in the quarters ended March 31, 2020 2019 Quarter Ended March 31, 2020 Quarter Ended March 31, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (1) Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (2) Cost of revenues $ 17 $ 306 $ — $ — $ 323 $ (25 ) $ 99 $ — $ — $ 74 Operating expenses 449 551 — 381 1,381 1,346 (63 ) — 247 1,530 Restructuring and related charges — 917 96 275 1,288 758 187 34 107 1,086 Other expense (105 ) 122 — 614 631 423 (247 ) — — 176 Total pre-tax restructuring charges $ 361 $ 1,896 $ 96 $ 1,270 $ 3,623 $ 2,502 $ (24 ) $ 34 $ 354 $ 2,866 ( 1 Total pre-tax restructuring charges for the quarter ended March 31, 2020 ( 2 Total pre-tax restructuring charges for the quarter ended March 31, 2019 The following tables summarize restructuring activity during the first 2020 2019 Utilized in 2020 Reserves at December 31, 2019 2020 Charge to Income Foreign Currency Translation Cash(1) Non-Cash Reserves at March 31, 2020 Severance and benefit related costs $ 4,389 $ 1,138 $ (16 ) $ 1,973 $ — $ 3,538 Contract termination costs 953 116 (6 ) 177 — 886 Relocation and other moving costs 367 34 3 70 — 334 Other restructuring costs 2,379 2,335 (21 ) 3,042 463 1,188 Total pre-tax restructuring charges $ 8,088 $ 3,623 $ (40 ) $ 5,262 $ 463 $ 5,946 ( 1 Refers to cash utilized to settle charges during the first 2020 Utilized in 2019 Reserves at December 31, 2018 2019 Charge to Income Foreign Currency Translation Cash(1) Non-Cash Reserves at March 31, 2019 Severance and benefit related costs $ 1,742 $ 495 $ (5 ) $ 1,102 $ — $ 1,130 Contract termination costs 359 540 3 310 — 592 Relocation and other moving costs — 51 — — — 51 Other restructuring costs 311 1,780 (2 ) 1,852 (151 ) 388 Total pre-tax restructuring charges $ 2,412 $ 2,866 $ (4 ) $ 3,264 $ (151 ) $ 2,161 ( 1 Refers to cash utilized to settle charges during the first 2019

Note 5 - Assets and Liabilities

Note 5 - Assets and Liabilities Held for Sale	3 Months Ended
	Mar. 31, 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 March 31, 2020 December 31, 2019 2019 The following table provides the components of assets and liabilities held for sale (in thousands): March 31, 2020(1) December 31, 2019(2) Assets held for sale: Current assets Receivables, net $ 543 $ 4,136 Retainage 535 518 Contract assets 1,830 5,350 Inventories 124 2,097 Prepaid expenses and other current assets 115 799 Total current assets 3,147 12,900 Property, plant & equipment, less accumulated depreciation 7,178 10,962 Goodwill 2,640 4,224 Intangible assets, less accumulated amortization 1,434 1,528 Operating lease assets 55 326 Other non-current assets 122 130 Impairment of assets held for sale (2,861 ) (13,978 ) Total assets held for sale $ 11,715 $ 16,092 Liabilities held for sale: Current liabilities Accounts payable $ 707 $ 2,174 Accrued expenses 882 3,961 Contract liabilities 7 122 Total current liabilities 1,596 6,257 Operating lease liabilities 12 174 Other non-current liabilities 40 54 Total liabilities held for sale $ 1,648 $ 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	3 Months Ended
	Mar. 31, 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 March 31, 2020 2019 Operating lease cost $ 5,206 $ 5,452 Short-term lease cost 6,081 7,239 Total lease cost $ 11,287 $ 12,691 Supplemental balance sheet information related to leases was as follows (in thousands): March 31, 2020(1) December 31, 2019(2) Operating leases: Operating lease assets $ 68,718 $ 71,466 Accrued expenses $ 14,532 $ 15,828 Other liabilities 54,985 56,253 Total operating lease liabilities $ 69,517 $ 72,081 Weighted-average remaining lease term (in years) 6.07 5.74 Weighted-average discount rate 5.61 % 5.71 % ( 1 Amounts exclude operating lease assets of $0.1 million and other liabilities of less than $0.1 million that were classified as held for sale at March 31, 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	3 Months Ended
	Mar. 31, 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: Foreign currency translation (884 ) (742 ) — (1,626 ) Balance, March 31, 2020 Goodwill, gross 239,276 76,204 81,504 396,984 Accumulated impairment losses (62,848 ) (45,400 ) (33,527 ) (141,775 ) Goodwill, net $ 176,428 $ 30,804 $ 47,977 $ 255,209 Intangible Assets Intangible assets consisted of the following (in thousands): March 31, 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 0.5 $ 3,894 $ (3,848 ) $ 46 $ 3,894 $ (3,824 ) $ 70 Leases 0.8 864 (798 ) 66 864 (777 ) 87 Trademarks 9.5 15,690 (7,069 ) 8,621 15,699 (6,911 ) 8,788 Non-competes 3.1 2,286 (1,416 ) 870 2,301 (1,354 ) 947 Customer relationships 7 157,241 (79,264 ) 77,977 157,576 (76,832 ) 80,744 Patents and acquired technology 7.5 38,637 (24,833 ) 13,804 39,289 (25,097 ) 14,192 Total intangible assets — $ 218,612 $ (117,228 ) $ 101,383 $ 219,623 $ (114,795 ) $ 104,828 Amortization expense was $3.4 million and $3.5 million for the quarters ended March 31, 2020 2019 December 31, 2020, 2021, 2022, 2023 2024

Note 8 - Long-term Debt and Cre

Note 8 - Long-term Debt and Credit Facility	3 Months Ended
	Mar. 31, 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): March 31, 2020 December 31, 2019 Term note, due February 27, 2023, annualized rates of 3.35% 4.09% $ 245,000 $ 253,750 Line of credit, 3.11% 4.01% 58,000 24,000 Other notes with interest rates from 3.3% 7.8% 668 770 Subtotal 303,668 278,520 Less – Current maturities of long-term debt 29,735 32,803 Less – Unamortized loan costs 1,923 2,088 Total $ 272,010 $ 243,629 In October 2015, February 2018 December 2018, March 31, 2020, five five February 2023. Based on the 2018 March 31, 2020 The Company’s indebtedness at March 31, 2020 first 2020 first 2020 19 As of March 31, 2020 The Company’s indebtedness at December 31, 2019 third At March 31, 2020 December 31, 2019 2 2. In October 2015, October 2020 $262.5 $262.5 $262.5 $262.5 March 31, 2020 13. On March 12, 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 March 31, 2020 • Consolidated financial leverage ratio compares consolidated funded indebtedness to amended Credit Facility defined income with a maximum amount not 1.00. March 31, 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. March 31, 2020, 1.00. At March 31, 2020 See Note 14 April 29, 2020.

Note 9 - Stockholders' Equity a

Note 9 - Stockholders' Equity and Equity Compensation	3 Months Ended
	Mar. 31, 2020
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	9. STOCKHOLDERS’ EQUITY AND EQUITY COMPENSATION Share Repurchase Plan In December 2019, two million two million December 2018. March 31, 2020, 2018 two 2019 one 10b5 1 1934. March 2020, 10b5 1 19. not March 31, 2020, 2020 1.00. 14 April 29, 2020. At March 31, 2020, may may 14 April 29, 2020. During the first 2020 During the first 2019, Equity-Based Compensation Plans In April 2016, 2016 2017 2016 “2016 April 2018, 2016 2016 2016 2013 2016 March 31, 2020 2016 In April 2016, 2016 “2016 2011 April 2019, 2016 2016 2016 2016 2016 March 31, 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 229,971 22.96 Performance stock units awarded 131,755 22.96 Restricted stock units distributed (152,596 ) 23.15 Performance stock units distributed (71,541 ) 28.18 Restricted stock units forfeited (15,717 ) 20.84 Performance stock units forfeited (76,282 ) 27.46 Outstanding at March 31, 2020 1,080,554 $ 22.53 Expense associated with stock awards was $1.8 million and $2.0 million for the quarters ended March 31, 2020 2019 March 31, 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 2,238 22.11 Distributed — — Outstanding at March 31, 2020 255,578 $ 20.72 Expense associated with deferred stock unit awards was $0.3 million and $0.1 million for the quarters ended March 31, 2020 2019 March 31, 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 March 31, 2020 December 31, 2019.

Note 10 - Taxes on Income

Note 10 - Taxes on Income	3 Months Ended
	Mar. 31, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	10. TAXES ON INCOME The Company’s effective tax rate in the quarter ended March 31, 2020 no first 2020. The Company’s effective tax rate in the quarter ended March 31, 2019 no

Note 11 - Commitments and Conti

Note 11 - Commitments and Contingencies	3 Months Ended
	Mar. 31, 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 March 31, 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 March 31, 2020

Note 12 - Segment Reporting

Note 12 - Segment Reporting	3 Months Ended
	Mar. 31, 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 March 31, 2020 2019 Revenues: Infrastructure Solutions $ 130,244 $ 131,543 Corrosion Protection 66,068 64,498 Energy Services 91,063 80,863 Total revenues $ 287,375 $ 276,904 Gross profit: Infrastructure Solutions $ 31,370 $ 26,586 Corrosion Protection 8,917 12,873 Energy Services 9,597 8,836 Total gross profit $ 49,884 $ 48,295 Operating income (loss): Infrastructure Solutions (1) $ 13,555 $ 5,715 Corrosion Protection (2) (6,447 ) (1,760 ) Energy Services 2,176 1,115 Corporate (3) (7,888 ) (5,844 ) Total operating income (loss) 1,396 (774 ) Other income (expense): Interest expense (3,196 ) (3,590 ) Interest income 228 285 Other (4) 425 (674 ) Total other expense (2,543 ) (3,979 ) Loss before taxes on income $ (1,147 ) $ (4,753 ) ( 1 Operating income in the first 2020 2019 4 ( 2 Operating loss in the first 2020 2019 4 ( 3 Operating loss in the first 2020 2019 4 first 2020 ( 4 Other expense in the first 2020 2019 4 first 2020 1 The following table summarizes revenues and gross profit by geographic region (in thousands): Quarter Ended March 31, 2020 2019 Revenues: (1) United States $ 233,220 $ 208,775 Canada 21,855 24,068 Europe 10,671 16,003 Other foreign 21,629 28,058 Total revenues $ 287,375 $ 276,904 Gross profit: (1) United States $ 39,636 $ 31,827 Canada 2,731 3,454 Europe 2,948 3,519 Other foreign 4,569 9,495 Total gross profit $ 49,884 $ 48,295 ( 1 Revenues and gross profit are attributed to the country of origin

Note 13 - Derivative Financial

Note 13 - Derivative Financial Instruments	3 Months Ended
	Mar. 31, 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 March 31, 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 2020. first 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 March 31, 2020 Position Notional Amount Weighted Average Remaining Maturity In Years Average Exchange Rate Interest Rate Swap — $ 183,750,000 2.75 — 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 March 31, 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 $ 10,458 $ 4,899 Total Liabilities $ 10,458 $ 4,899 Total Derivative Assets $ — $ 261 Total Derivative Liabilities 10,458 4,899 Total Net Derivative Asset (Liability) $ (10,458 ) $ (4,638 )

Note 14 - Subsequent Events

Note 14 - Subsequent Events	3 Months Ended
	Mar. 31, 2020
Notes to Financial Statements
Subsequent Events [Text Block]	14. SUBSEQUENT EVENT Due to the potential impacts of COVID- 19 April 29, 2020, February 2023, April 29, 2020 first 2021. The amended Credit Facility also places certain limits on the Company’s open market share repurchase program and repurchases of common stock in connection with the Company’s equity compensation programs for employees. Open market repurchases of the Company’s common stock are limited through June 30, 2021 1.00; $20.0 1.00, 1.00; zero 1.00. June 30, 2021. The Company paid approximately $2.1 million for arranging fees, up-front lending fees and other expenses associated with the amended Credit Facility. The amended Credit Facility now includes more flexible financial covenants, which based on current projections, provide the Company with additional expected borrowing capacity over the next twelve June 30, 2020, • Consolidated financial leverage ratio compares consolidated funded indebtedness to amended Credit Facility defined income. The maximum amount is not 1.00 June 30, 2020, 1.00 September 30, 2020, 1.00 December 31, 2020, 1.00 March 31, 2021, 1.00 June 30, 2021, not 1.00 September 30, 2021. • Consolidated fixed charge coverage ratio compares amended Credit Facility defined income to amended Credit Facility defined fixed charges. The minimum permitted ratio is not 1.00 June 30, 2020 1.00 March 31, 2021 1.00 June 30, 2021. Due to the speed with which the COVID- 19 19 second 2020. Because the COVID- 19 may

Significant Accounting Policies

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Accumulated Other Comprehensive Loss As set forth below, the Company’s accumulated other comprehensive loss is comprised of three March 31, 2020 December 31, 2019 Currency translation adjustments (1) $ (31,615 ) $ (27,241 ) Derivative hedging activity (10,458 ) (4,522 ) Pension activity (874 ) (931 ) Total accumulated other comprehensive loss $ (42,947 ) $ (32,694 ) ( 1 During the quarter ended March 31, 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 gain of $0.6 million and loss of ($0.8) million in the first 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 March 31, 2020 2019 Weighted average number of common shares used for basic EPS 30,716,802 31,704,923 Effect of dilutive stock options and restricted and deferred stock unit awards — — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 30,716,802 31,704,923 The Company excluded 553,766 and 549,679 restricted and deferred stock units for the quarters ended March 31, 2020 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 March 31, 2020 December 31, 2019 Cash and cash equivalents $ 73,210 $ 64,874 Restricted cash 1,070 1,348 Cash, cash equivalents and restricted cash $ 74,280 $ 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; however, the Company does not 2 no 1, 2 3 March 31, 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 March 31, 2020 Financial data for consolidated variable interest entities are summarized in the following tables (in thousands): Balance sheet data March 31, 2020 December 31, 2019 Current assets $ 16,424 $ 18,304 Non-current assets 7,956 7,635 Current liabilities 6,230 8,261 Non-current liabilities 2,744 1,962 Quarter Ended March 31, Statement of operations data 2020 2019 Revenue $ 7,729 $ 5,925 Gross profit 2,303 1,635 Net income attributable to Aegion Corporation 285 33
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)	3 Months Ended
	Mar. 31, 2020
Notes Tables
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	March 31, 2020 December 31, 2019 Currency translation adjustments (1) $ (31,615 ) $ (27,241 ) Derivative hedging activity (10,458 ) (4,522 ) Pension activity (874 ) (931 ) Total accumulated other comprehensive loss $ (42,947 ) $ (32,694 )
Schedule of Weighted Average Number of Shares [Table Text Block]	Quarter Ended March 31, 2020 2019 Weighted average number of common shares used for basic EPS 30,716,802 31,704,923 Effect of dilutive stock options and restricted and deferred stock unit awards — — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 30,716,802 31,704,923
Restrictions on Cash and Cash Equivalents [Table Text Block]	Balance sheet data March 31, 2020 December 31, 2019 Cash and cash equivalents $ 73,210 $ 64,874 Restricted cash 1,070 1,348 Cash, cash equivalents and restricted cash $ 74,280 $ 66,222
Schedule of Variable Interest Entities [Table Text Block]	Balance sheet data March 31, 2020 December 31, 2019 Current assets $ 16,424 $ 18,304 Non-current assets 7,956 7,635 Current liabilities 6,230 8,261 Non-current liabilities 2,744 1,962 Quarter Ended March 31, Statement of operations data 2020 2019 Revenue $ 7,729 $ 5,925 Gross profit 2,303 1,635 Net income attributable to Aegion Corporation 285 33

Note 3 - Revenues (Tables)

Note 3 - Revenues (Tables)	3 Months Ended
	Mar. 31, 2020
Notes Tables
Disaggregation of Revenue [Table Text Block]	Quarter Ended March 31, 2020 Quarter Ended March 31, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Geographic region: United States $ 103,418 $ 38,739 $ 91,063 $ 233,220 $ 97,891 $ 30,021 $ 80,863 $ 208,775 Canada 11,023 10,832 — 21,855 10,611 13,457 — 24,068 Europe 7,642 3,029 — 10,671 12,525 3,478 — 16,003 Other foreign 8,161 13,468 — 21,629 10,516 17,542 — 28,058 Total revenues $ 130,244 $ 66,068 $ 91,063 $ 287,375 $ 131,543 $ 64,498 $ 80,863 $ 276,904 Quarter Ended March 31, 2020 Quarter Ended March 31, 2019 Infrastructure Solutions Corrosion Protection Energy Services Total Infrastructure Solutions Corrosion Protection Energy Services Total Contract type: Fixed fee $ 112,511 $ 44,255 $ 1,730 $ 158,496 $ 118,915 $ 42,572 $ 919 $ 162,406 Time and materials — 12,970 89,333 102,303 — 14,977 79,944 94,921 Product sales 17,733 8,843 — 26,576 12,478 6,949 — 19,427 License fees — — — — 150 — — 150 Total revenues $ 130,244 $ 66,068 $ 91,063 $ 287,375 $ 131,543 $ 64,498 $ 80,863 $ 276,904
Contract Asset and Liability [Table Text Block]	March 31, 2020 (1) December 31, 2019 (2) Contract assets – current $ 55,978 $ 51,092 Contract liabilities – current (39,480 ) (37,562 ) Net contract assets $ 16,498 $ 13,530

Note 4 - Restructuring (Tables)

Note 4 - Restructuring (Tables)	3 Months Ended
	Mar. 31, 2020
Notes Tables
Restructuring and Related Costs [Table Text Block]	Quarter Ended March 31, 2020 Quarter Ended March 31, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Infrastructure Solutions Corrosion Protection Energy Services Corporate Total Severance and benefit related costs $ — $ 863 $ — $ 275 $ 1,138 $ 282 $ 170 $ 34 $ 9 $ 495 Contract termination costs — 54 62 — 116 425 17 — 98 540 Relocation and other moving costs — — 34 — 34 51 — — — 51 Other restructuring costs (1) 361 979 — 995 2,335 1,744 (211 ) — 247 1,780 Total pre-tax restructuring charges $ 361 $ 1,896 $ 96 $ 1,270 $ 3,623 $ 2,502 $ (24 ) $ 34 $ 354 $ 2,866 Quarter Ended March 31, 2020 Quarter Ended March 31, 2019 Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (1) Infrastructure Solutions Corrosion Protection Energy Services Corporate Total (2) Cost of revenues $ 17 $ 306 $ — $ — $ 323 $ (25 ) $ 99 $ — $ — $ 74 Operating expenses 449 551 — 381 1,381 1,346 (63 ) — 247 1,530 Restructuring and related charges — 917 96 275 1,288 758 187 34 107 1,086 Other expense (105 ) 122 — 614 631 423 (247 ) — — 176 Total pre-tax restructuring charges $ 361 $ 1,896 $ 96 $ 1,270 $ 3,623 $ 2,502 $ (24 ) $ 34 $ 354 $ 2,866
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 March 31, 2020 Severance and benefit related costs $ 4,389 $ 1,138 $ (16 ) $ 1,973 $ — $ 3,538 Contract termination costs 953 116 (6 ) 177 — 886 Relocation and other moving costs 367 34 3 70 — 334 Other restructuring costs 2,379 2,335 (21 ) 3,042 463 1,188 Total pre-tax restructuring charges $ 8,088 $ 3,623 $ (40 ) $ 5,262 $ 463 $ 5,946 Utilized in 2019 Reserves at December 31, 2018 2019 Charge to Income Foreign Currency Translation Cash(1) Non-Cash Reserves at March 31, 2019 Severance and benefit related costs $ 1,742 $ 495 $ (5 ) $ 1,102 $ — $ 1,130 Contract termination costs 359 540 3 310 — 592 Relocation and other moving costs — 51 — — — 51 Other restructuring costs 311 1,780 (2 ) 1,852 (151 ) 388 Total pre-tax restructuring charges $ 2,412 $ 2,866 $ (4 ) $ 3,264 $ (151 ) $ 2,161

Note 5 - Assets and Liabiliti_2

Note 5 - Assets and Liabilities Held for Sale (Tables)	3 Months Ended
	Mar. 31, 2020
Notes Tables
Disposal Groups, Including Discontinued Operations [Table Text Block]	March 31, 2020(1) December 31, 2019(2) Assets held for sale: Current assets Receivables, net $ 543 $ 4,136 Retainage 535 518 Contract assets 1,830 5,350 Inventories 124 2,097 Prepaid expenses and other current assets 115 799 Total current assets 3,147 12,900 Property, plant & equipment, less accumulated depreciation 7,178 10,962 Goodwill 2,640 4,224 Intangible assets, less accumulated amortization 1,434 1,528 Operating lease assets 55 326 Other non-current assets 122 130 Impairment of assets held for sale (2,861 ) (13,978 ) Total assets held for sale $ 11,715 $ 16,092 Liabilities held for sale: Current liabilities Accounts payable $ 707 $ 2,174 Accrued expenses 882 3,961 Contract liabilities 7 122 Total current liabilities 1,596 6,257 Operating lease liabilities 12 174 Other non-current liabilities 40 54 Total liabilities held for sale $ 1,648 $ 6,485

Note 6 - Leases (Tables)

Note 6 - Leases (Tables)	3 Months Ended
	Mar. 31, 2020
Notes Tables
Lease, Cost [Table Text Block]	Quarter Ended March 31, 2020 2019 Operating lease cost $ 5,206 $ 5,452 Short-term lease cost 6,081 7,239 Total lease cost $ 11,287 $ 12,691
Lease, Supplemental Financial Statement Disclosures, Balance Sheet [Table Text Block]	March 31, 2020(1) December 31, 2019(2) Operating leases: Operating lease assets $ 68,718 $ 71,466 Accrued expenses $ 14,532 $ 15,828 Other liabilities 54,985 56,253 Total operating lease liabilities $ 69,517 $ 72,081 Weighted-average remaining lease term (in years) 6.07 5.74 Weighted-average discount rate 5.61 % 5.71 %

Note 7 - Goodwill and Intangi_2

Note 7 - Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 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: Foreign currency translation (884 ) (742 ) — (1,626 ) Balance, March 31, 2020 Goodwill, gross 239,276 76,204 81,504 396,984 Accumulated impairment losses (62,848 ) (45,400 ) (33,527 ) (141,775 ) Goodwill, net $ 176,428 $ 30,804 $ 47,977 $ 255,209
Schedule of Finite-Lived Intangible Assets [Table Text Block]	March 31, 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 0.5 $ 3,894 $ (3,848 ) $ 46 $ 3,894 $ (3,824 ) $ 70 Leases 0.8 864 (798 ) 66 864 (777 ) 87 Trademarks 9.5 15,690 (7,069 ) 8,621 15,699 (6,911 ) 8,788 Non-competes 3.1 2,286 (1,416 ) 870 2,301 (1,354 ) 947 Customer relationships 7 157,241 (79,264 ) 77,977 157,576 (76,832 ) 80,744 Patents and acquired technology 7.5 38,637 (24,833 ) 13,804 39,289 (25,097 ) 14,192 Total intangible assets — $ 218,612 $ (117,228 ) $ 101,383 $ 219,623 $ (114,795 ) $ 104,828

Note 8 - Long-term Debt and C_2

Note 8 - Long-term Debt and Credit Facility (Tables)	3 Months Ended
	Mar. 31, 2020
Notes Tables
Schedule of Long-term Debt Instruments [Table Text Block]	March 31, 2020 December 31, 2019 Term note, due February 27, 2023, annualized rates of 3.35% 4.09% $ 245,000 $ 253,750 Line of credit, 3.11% 4.01% 58,000 24,000 Other notes with interest rates from 3.3% 7.8% 668 770 Subtotal 303,668 278,520 Less – Current maturities of long-term debt 29,735 32,803 Less – Unamortized loan costs 1,923 2,088 Total $ 272,010 $ 243,629

Note 9 - Stockholders' Equity_2

Note 9 - Stockholders' Equity and Equity Compensation (Tables)	3 Months Ended
	Mar. 31, 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 229,971 22.96 Performance stock units awarded 131,755 22.96 Restricted stock units distributed (152,596 ) 23.15 Performance stock units distributed (71,541 ) 28.18 Restricted stock units forfeited (15,717 ) 20.84 Performance stock units forfeited (76,282 ) 27.46 Outstanding at March 31, 2020 1,080,554 $ 22.53
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 2,238 22.11 Distributed — — Outstanding at March 31, 2020 255,578 $ 20.72

Note 12 - Segment Reporting (Ta

Note 12 - Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2020
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Quarter Ended March 31, 2020 2019 Revenues: Infrastructure Solutions $ 130,244 $ 131,543 Corrosion Protection 66,068 64,498 Energy Services 91,063 80,863 Total revenues $ 287,375 $ 276,904 Gross profit: Infrastructure Solutions $ 31,370 $ 26,586 Corrosion Protection 8,917 12,873 Energy Services 9,597 8,836 Total gross profit $ 49,884 $ 48,295 Operating income (loss): Infrastructure Solutions (1) $ 13,555 $ 5,715 Corrosion Protection (2) (6,447 ) (1,760 ) Energy Services 2,176 1,115 Corporate (3) (7,888 ) (5,844 ) Total operating income (loss) 1,396 (774 ) Other income (expense): Interest expense (3,196 ) (3,590 ) Interest income 228 285 Other (4) 425 (674 ) Total other expense (2,543 ) (3,979 ) Loss before taxes on income $ (1,147 ) $ (4,753 ) Quarter Ended March 31, 2020 2019 Revenues: (1) United States $ 233,220 $ 208,775 Canada 21,855 24,068 Europe 10,671 16,003 Other foreign 21,629 28,058 Total revenues $ 287,375 $ 276,904 Gross profit: (1) United States $ 39,636 $ 31,827 Canada 2,731 3,454 Europe 2,948 3,519 Other foreign 4,569 9,495 Total gross profit $ 49,884 $ 48,295

Note 13 - Derivative Financia_2

Note 13 - Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 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 — $ 183,750,000 2.75 —
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	Designation of Derivatives Balance Sheet Location March 31, 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 $ 10,458 $ 4,899 Total Liabilities $ 10,458 $ 4,899 Total Derivative Assets $ — $ 261 Total Derivative Liabilities 10,458 4,899 Total Net Derivative Asset (Liability) $ (10,458 ) $ (4,638 )

Note 2 - Accounting Policies (D

Note 2 - Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax, Total	$ 700
Foreign Currency Transaction Gain (Loss), Realized	$ 588	$ (772)
Stock Options and Restricted and Deferred Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	553,766	549,679
Other Expense [Member]
Foreign Currency Transaction Gain (Loss), Realized	$ 600	$ (800)

Note 2 - Accounting Policies -

Note 2 - Accounting Policies - Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Currency translation adjustments	[1]	$ (31,615)	$ (27,241)
Derivative hedging activity		(10,458)	(4,522)
Pension activity		(874)	(931)
Total accumulated other comprehensive loss		$ (42,947)	$ (32,694)
[1]	During the quarter ended March 31, 2020, as a result of disposing of certain international entities, $0.7 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
	Mar. 31, 2020	Mar. 31, 2019
Weighted average number of common shares used for basic EPS (in shares)	30,716,802	31,704,923
Effect of dilutive stock options and restricted and deferred stock unit awards (in shares)	0	0
Weighted average number of common shares and dilutive potential common stock used for dilutive EPS (in shares)	30,716,802	31,704,923

Note 2 - Accounting Policies _3

Note 2 - Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 73,210	$ 64,874
Restricted cash	1,070	1,348
Cash, cash equivalents and restricted cash	$ 74,280	$ 66,222

Note 2 - Accounting Policies _4

Note 2 - Accounting Policies - Investments in Variable Interest Entities (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Current assets		$ 454,400		$ 450,215
Current liabilities		212,451		234,041
Revenue	[1]	287,375	$ 276,904
Gross profit	[1]	49,884	48,295
Net income attributable to Aegion Corporation		(1,632)	(4,001)
Variable Interest Entity, Primary Beneficiary [Member]
Current assets		16,424		18,304
Non-current assets		7,956		7,635
Current liabilities		6,230		8,261
Non-current liabilities		2,744		$ 1,962
Revenue		7,729	5,925
Gross profit		2,303	1,635
Net income attributable to Aegion Corporation		$ 285	$ 33
[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		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Disposal Group, Including Discontinued Operation, Contract Assets, Current	$ 1.8		$ 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	$ 462.3
Product and Services [Member]
Revenue Recognized, Percent	90.80%	92.90%
Product [Member]
Revenue Recognized, Percent	9.20%		7.10%

Note 3 - Revenues 2 (Details Te

Note 3 - Revenues 2 (Details Textual) - Construction, Engineering and Installation Services [Member] $ in Millions	Mar. 31, 2020USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 462.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Amount	$ 449.9
Revenue, Remaining Performance Obligation, Percentage	97.30%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	12 months

Note 3 - Revenue - Disaggregati

Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Revenues	[1]	$ 287,375	$ 276,904
Fixed-price Contract [Member]
Revenues		158,496	162,406
Time-and-materials Contract [Member]
Revenues		102,303	94,921
Product Sales [Member]
Revenues		26,576	19,427
License Fees [Member]
Revenues		0	150
Infrastructure Solutions [Member]
Revenues		130,244	131,543
Infrastructure Solutions [Member] | Fixed-price Contract [Member]
Revenues		112,511	118,915
Infrastructure Solutions [Member] | Time-and-materials Contract [Member]
Revenues		0	0
Infrastructure Solutions [Member] | Product Sales [Member]
Revenues		17,733	12,478
Infrastructure Solutions [Member] | License Fees [Member]
Revenues		0	150
Corrosion Protection [Member]
Revenues		66,068	64,498
Corrosion Protection [Member] | Fixed-price Contract [Member]
Revenues		44,255	42,572
Corrosion Protection [Member] | Time-and-materials Contract [Member]
Revenues		12,970	14,977
Corrosion Protection [Member] | Product Sales [Member]
Revenues		8,843	6,949
Corrosion Protection [Member] | License Fees [Member]
Revenues		0	0
Energy Services [Member]
Revenues		91,063	80,863
Energy Services [Member] | Fixed-price Contract [Member]
Revenues		1,730	919
Energy Services [Member] | Time-and-materials Contract [Member]
Revenues		89,333	79,944
Energy Services [Member] | Product Sales [Member]
Revenues		0	0
Energy Services [Member] | License Fees [Member]
Revenues		0	0
UNITED STATES
Revenues	[1]	233,220	208,775
UNITED STATES | Infrastructure Solutions [Member]
Revenues		103,418	97,891
UNITED STATES | Corrosion Protection [Member]
Revenues		38,739	30,021
UNITED STATES | Energy Services [Member]
Revenues		91,063	80,863
CANADA
Revenues	[1]	21,855	24,068
CANADA | Infrastructure Solutions [Member]
Revenues		11,023	10,611
CANADA | Corrosion Protection [Member]
Revenues		10,832	13,457
CANADA | Energy Services [Member]
Revenues		0	0
Europe [Member]
Revenues	[1]	10,671	16,003
Europe [Member] | Infrastructure Solutions [Member]
Revenues		7,642	12,525
Europe [Member] | Corrosion Protection [Member]
Revenues		3,029	3,478
Europe [Member] | Energy Services [Member]
Revenues		0	0
Other Foreign Countries [Member]
Revenues	[1]	21,629	28,058
Other Foreign Countries [Member] | Infrastructure Solutions [Member]
Revenues		8,161	10,516
Other Foreign Countries [Member] | Corrosion Protection [Member]
Revenues		13,468	17,542
Other Foreign Countries [Member] | Energy Services [Member]
Revenues		$ 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	Mar. 31, 2020	[1]	Dec. 31, 2019	[2]
Contract assets – current	$ 55,978		$ 51,092
Contract liabilities – current	(39,480)		(37,562)
Net contract assets	$ 16,498		$ 13,530
[1]	Amounts exclude contract assets of $1.8 million and contract liabilities of less than $0.1 million that were classified as held for sale at March 31, 2020 (see Note 5).
[2]	Amounts exclude contract assets of $5.4 million and contract liabilities of $0.2 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					12 Months Ended		32 Months Ended
	Mar. 31, 2020USD ($)		Dec. 31, 2019	Mar. 31, 2019USD ($)		Dec. 31, 2019	Dec. 31, 2017USD ($)	Mar. 31, 2020USD ($)
Restructuring Charges, Non-Cash	$ 463			$ (151)
Restructuring 2017 [Member]
Restructuring Charges Pre Tax								$ 158,900
Payments for Restructuring	5,262	[1]		3,264	[2]			48,500
Restructuring Reserve, Settled without Cash								$ 127,100
Restructuring and Related Cost, Number of Positions Eliminated							650
Restructuring Charges, Cash	3,100			3,100
Restructuring Charges, Non-Cash	463			(151)
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							$ 40,700
Severance, Other Termination Benefit Costs and Contract Termination Costs [Member] | Restructuring 2017 [Member]
Restructuring and Related Costs, Incurred Cost, Total	$ 1,300			$ 1,100
[1]	Refers to cash utilized to settle charges during the first quarter of 2020.
[2]	Refers to cash utilized to settle charges during the first quarter of 2019.

Note 4 - Restructuring - Pre Ta

Note 4 - Restructuring - Pre Tax Restructuring Cost (Details) - Restructuring 2017 [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Restructuring charges		$ 3,623	[1]	$ 2,866	[2]
Cost of Revenues [Member]
Restructuring charges		323	[1]	74	[2]
Operating Expense [Member]
Restructuring charges		1,381	[1]	1,530	[2]
Restructuring and Related Charges [Member]
Restructuring charges		1,288	[1]	1,086	[2]
Other Expense [Member]
Restructuring charges		631	[1]	176	[2]
Employee Severance [Member]
Restructuring charges		1,138		495
Contract Termination [Member]
Restructuring charges		116		540
Employee Relocation [Member]
Restructuring charges		34		51
Other Restructuring [Member]
Restructuring charges	[3]	2,335		1,780
Operating Segments [Member] | Infrastructure Solutions [Member]
Restructuring charges		361		2,502
Operating Segments [Member] | Infrastructure Solutions [Member] | Cost of Revenues [Member]
Restructuring charges		17		(25)
Operating Segments [Member] | Infrastructure Solutions [Member] | Operating Expense [Member]
Restructuring charges		449		1,346
Operating Segments [Member] | Infrastructure Solutions [Member] | Restructuring and Related Charges [Member]
Restructuring charges		0		758
Operating Segments [Member] | Infrastructure Solutions [Member] | Other Expense [Member]
Restructuring charges		(105)		423
Operating Segments [Member] | Infrastructure Solutions [Member] | Employee Severance [Member]
Restructuring charges		0		282
Operating Segments [Member] | Infrastructure Solutions [Member] | Contract Termination [Member]
Restructuring charges		0		425
Operating Segments [Member] | Infrastructure Solutions [Member] | Employee Relocation [Member]
Restructuring charges		0		51
Operating Segments [Member] | Infrastructure Solutions [Member] | Other Restructuring [Member]
Restructuring charges	[3]	361		1,744
Operating Segments [Member] | Corrosion Protection [Member]
Restructuring charges		1,896		(24)
Operating Segments [Member] | Corrosion Protection [Member] | Cost of Revenues [Member]
Restructuring charges		306		99
Operating Segments [Member] | Corrosion Protection [Member] | Operating Expense [Member]
Restructuring charges		551		(63)
Operating Segments [Member] | Corrosion Protection [Member] | Restructuring and Related Charges [Member]
Restructuring charges		917		187
Operating Segments [Member] | Corrosion Protection [Member] | Other Expense [Member]
Restructuring charges		122		(247)
Operating Segments [Member] | Corrosion Protection [Member] | Employee Severance [Member]
Restructuring charges		863		170
Operating Segments [Member] | Corrosion Protection [Member] | Contract Termination [Member]
Restructuring charges		54		17
Operating Segments [Member] | Corrosion Protection [Member] | Employee Relocation [Member]
Restructuring charges		0		0
Operating Segments [Member] | Corrosion Protection [Member] | Other Restructuring [Member]
Restructuring charges	[3]	979		(211)
Operating Segments [Member] | Energy Services [Member]
Restructuring charges		96		34
Operating Segments [Member] | Energy Services [Member] | Cost of Revenues [Member]
Restructuring charges		0		0
Operating Segments [Member] | Energy Services [Member] | Operating Expense [Member]
Restructuring charges		0		0
Operating Segments [Member] | Energy Services [Member] | Restructuring and Related Charges [Member]
Restructuring charges		96		34
Operating Segments [Member] | Energy Services [Member] | Other Expense [Member]
Restructuring charges		0		0
Operating Segments [Member] | Energy Services [Member] | Employee Severance [Member]
Restructuring charges		0		34
Operating Segments [Member] | Energy Services [Member] | Contract Termination [Member]
Restructuring charges		62		0
Operating Segments [Member] | Energy Services [Member] | Employee Relocation [Member]
Restructuring charges		34		0
Operating Segments [Member] | Energy Services [Member] | Other Restructuring [Member]
Restructuring charges	[3]	0		0
Corporate, Non-Segment [Member]
Restructuring charges		1,270		354
Corporate, Non-Segment [Member] | Cost of Revenues [Member]
Restructuring charges		0		0
Corporate, Non-Segment [Member] | Operating Expense [Member]
Restructuring charges		381		247
Corporate, Non-Segment [Member] | Restructuring and Related Charges [Member]
Restructuring charges		275		107
Corporate, Non-Segment [Member] | Other Expense [Member]
Restructuring charges		614		0
Corporate, Non-Segment [Member] | Employee Severance [Member]
Restructuring charges		275		9
Corporate, Non-Segment [Member] | Contract Termination [Member]
Restructuring charges		0		98
Corporate, Non-Segment [Member] | Employee Relocation [Member]
Restructuring charges		0		0
Corporate, Non-Segment [Member] | Other Restructuring [Member]
Restructuring charges	[3]	$ 995		$ 247
[1]	Total pre-tax restructuring charges for the quarter ended March 31, 2020, include cash charges of $3.1 million and non-cash charges of $0.5 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[2]	Total pre-tax restructuring charges for the quarter ended March 31, 2019, include cash charges of $3.1 million and non-cash charges of (0.2) 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]	For the quarter ended March 31, 2020, charges primarily related to certain wind-down costs, 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. For the quarter ended March 31, 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 the UK, 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) - USD ($) $ in Thousands		3 Months Ended				32 Months Ended
		Mar. 31, 2020		Mar. 31, 2019		Mar. 31, 2020
Restructuring reserve, settled without cash		$ 463		$ (151)
Restructuring 2017 [Member]
Restructuring reserve, balance		8,088		2,412
Restructuring charges		3,623	[1]	2,866	[2]
Restructuring reserve, foreign currency translation		(40)		(4)
Restructuring reserve, settled with cash		5,262	[3]	3,264	[4]	$ 48,500
Restructuring reserve, settled without cash		463		(151)
Restructuring reserve, balance		5,946		2,161		5,946
Employee Severance [Member] | Restructuring 2017 [Member]
Restructuring reserve, balance		4,389		1,742
Restructuring charges		1,138		495
Restructuring reserve, foreign currency translation		(16)		(5)
Restructuring reserve, settled with cash		1,973	[3]	1,102	[4]
Restructuring reserve, settled without cash		0		0
Restructuring reserve, balance		3,538		1,130		3,538
Contract Termination [Member] | Restructuring 2017 [Member]
Restructuring reserve, balance		953		359
Restructuring charges		116		540
Restructuring reserve, foreign currency translation		(6)		3
Restructuring reserve, settled with cash		177	[3]	310	[4]
Restructuring reserve, settled without cash		0		0
Restructuring reserve, balance		886		592		886
Employee Relocation [Member] | Restructuring 2017 [Member]
Restructuring reserve, balance		367		0
Restructuring charges		34		51
Restructuring reserve, foreign currency translation		3		0
Restructuring reserve, settled with cash		70	[3]	0	[4]
Restructuring reserve, settled without cash		0		0
Restructuring reserve, balance		334		51		334
Other Restructuring [Member] | Restructuring 2017 [Member]
Restructuring reserve, balance		2,379		311
Restructuring charges	[5]	2,335		1,780
Restructuring reserve, foreign currency translation		(21)		(2)
Restructuring reserve, settled with cash		3,042	[3]	1,852	[4]
Restructuring reserve, settled without cash		463		(151)
Restructuring reserve, balance		$ 1,188		$ 388		$ 1,188
[1]	Total pre-tax restructuring charges for the quarter ended March 31, 2020, include cash charges of $3.1 million and non-cash charges of $0.5 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[2]	Total pre-tax restructuring charges for the quarter ended March 31, 2019, include cash charges of $3.1 million and non-cash charges of (0.2) 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]	Refers to cash utilized to settle charges during the first quarter of 2020.
[4]	Refers to cash utilized to settle charges during the first quarter of 2019.
[5]	For the quarter ended March 31, 2020, charges primarily related to certain wind-down costs, 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. For the quarter ended March 31, 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 the UK, 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) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Corporate, Non-Segment [Member]
Impairment of Long-Lived Assets to be Disposed of	$ 2.9

Note 5 - Assets and Liabiliti_4

Note 5 - Assets and Liabilities Held for Sale - Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020		Dec. 31, 2019
Disposal Group, Including Discontinued Operation, Contract Assets, Current	$ 1,800		$ 5,400
Total current assets	11,715		16,092
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current	100		100
Total current liabilities	1,648		6,485
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Receivables, net	543	[1]	4,136	[2]
Retainage	535	[1]	518	[2]
Disposal Group, Including Discontinued Operation, Contract Assets, Current	1,830	[1]	5,350	[2]
Inventories	124	[1]	2,097	[2]
Prepaid expenses and other current assets	115	[1]	799	[2]
Total current assets	3,147	[1]	12,900	[2]
Property, plant & equipment, less accumulated depreciation	7,178	[1]	10,962	[2]
Goodwill	2,640	[1]	4,224	[2]
Intangible assets, less accumulated amortization	1,434	[1]	1,528	[2]
Disposal Group, Including Discontinued Operation, Operating Lease, Right-of-Use Asset	55	[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	11,715	[1]	16,092	[2]
Accounts payable	707	[1]	2,174	[2]
Accrued expenses	882	[1]	3,961	[2]
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current	7	[1]	122	[2]
Total current liabilities	1,596	[1]	6,257	[2]
Disposal Group, Including Discontinued Operation, Operating Lease, Liability, Noncurrent	12	[1]	174	[2]
Other non-current liabilities	40	[1]	54	[2]
Total liabilities held for sale	$ 1,648	[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 Thousands	Mar. 31, 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	$ 55	[1]	$ 326	[2]
Disposal Group, Including Discontinued Operation, Other Liabilities	100
Disposal Group Including Discontinued Operation, Operating Lease Liability Current			200
Disposal Group, Including Discontinued Operation, Operating Lease, Liability, Noncurrent	$ 12	[1]	$ 174	[2]
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	20 years
[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 - Lease Expense

Note 6 - Leases - Lease Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating lease cost	$ 5,206	$ 5,452
Short-term lease cost	6,081	7,239
Total lease cost	$ 11,287	$ 12,691

Note 6 - Leases - Supplement Fi

Note 6 - Leases - Supplement Financial Statement Disclosure (Details) - USD ($) $ in Thousands	Mar. 31, 2020		Dec. 31, 2019
Operating lease assets	$ 68,718	[1]	$ 71,466	[2]
Other liabilities	$ 54,985		$ 56,253
Weighted-average remaining lease term (Year)	6 years 25 days	[1]	5 years 8 months 26 days	[2]
Weighted-average discount rate	5.61%	[1]	5.71%	[2]
Accrued Expense [Member]
Accrued expenses	$ 14,532	[1]	$ 15,828	[2]
Other Liabilities [Member]
Other liabilities	54,985	[1]	56,253	[2]
Accrued Expense and Other Liabilities [Member]
Total operating lease liabilities	$ 69,517	[1]	$ 72,081	[2]
[1]	Amounts exclude operating lease assets of $0.1 million and other liabilities of less than $0.1 million that were classified as held for sale at March 31, 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 Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Amortization of Intangible Assets, Total	$ 3.4	$ 3.5
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year	13.2
Finite-Lived Intangible Asset, Expected Amortization, Year Two	13
Finite-Lived Intangible Asset, Expected Amortization, Year Three	13
Finite-Lived Intangible Asset, Expected Amortization, Year Four	13
Finite-Lived Intangible Asset, Expected Amortization, Year Five	$ 12.3

Note 7 - Goodwill and Intangi_4

Note 7 - Goodwill and Intangible Assets - Reconciliation Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Goodwill, gross	$ 396,984	$ 398,610
Accumulated impairment losses	(141,775)	(141,775)
Goodwill, net	255,209	256,835
Foreign currency translation	(1,626)
Infrastructure Solutions [Member]
Goodwill, gross	239,276	240,160
Accumulated impairment losses	(62,848)	(62,848)
Goodwill, net	176,428	177,312
Foreign currency translation	(884)
Corrosion Protection [Member]
Goodwill, gross	76,204	76,946
Accumulated impairment losses	(45,400)	(45,400)
Goodwill, net	30,804	31,546
Foreign currency translation	(742)
Energy Services [Member]
Goodwill, gross	81,504	81,504
Accumulated impairment losses	(33,527)	(33,527)
Goodwill, net	47,977	$ 47,977
Foreign currency translation	$ 0

Note 7 - Goodwill and Intangi_5

Note 7 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Gross carrying amount	$ 218,612	$ 219,623
Accumulated amortization	(117,228)	(114,795)
Net carrying amount	$ 101,383	104,828
Licensing Agreements [Member]
Weighted average useful lives (Year)	6 months
Gross carrying amount	$ 3,894	3,894
Accumulated amortization	(3,848)	(3,824)
Net carrying amount	$ 46	70
Lease Agreements [Member]
Weighted average useful lives (Year)	9 months 18 days
Gross carrying amount	$ 864	864
Accumulated amortization	(798)	(777)
Net carrying amount	$ 66	87
Trademarks [Member]
Weighted average useful lives (Year)	9 years 6 months
Gross carrying amount	$ 15,690	15,699
Accumulated amortization	(7,069)	(6,911)
Net carrying amount	$ 8,621	8,788
Noncompete Agreements [Member]
Weighted average useful lives (Year)	3 years 1 month 6 days
Gross carrying amount	$ 2,286	2,301
Accumulated amortization	(1,416)	(1,354)
Net carrying amount	$ 870	947
Customer Relationships [Member]
Weighted average useful lives (Year)	7 years
Gross carrying amount	$ 157,241	157,576
Accumulated amortization	(79,264)	(76,832)
Net carrying amount	$ 77,977	80,744
Patents [Member]
Weighted average useful lives (Year)	7 years 6 months
Gross carrying amount	$ 38,637	39,289
Accumulated amortization	(24,833)	(25,097)
Net carrying amount	$ 13,804	$ 14,192

Note 8 - Long-term Debt and C_3

Note 8 - Long-term Debt and Credit Facility (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 12, 2018	Oct. 31, 2015
Long-term Debt, Total	$ 303,668	$ 278,520
Long-term Debt, Fair Value	294,000	286,900
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
Term Loan [Member]
Long-term Debt, Total	245,000	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	58,000	24,000
Other Loans Payable, Total	700	$ 800
Letters of Credit Outstanding, Amount	$ 25,100
Derivative, Amount of Hedged Item				$ 262,500
Credit Facility Maximum Consolidated Leverage Ratio	3.25
Credit Facility Actual Consolidated Leverage Ratio	3.12
Line of Credit Facility, Remaining Borrowing Capacity	$ 12,700
Credit Facility Minimum Consolidated Fixed Charge Ratio	1.25
Credit Facility Actual Consolidated Fixed Charge Ratio	1.38
A 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Interest Rate, Effective Percentage	3.11%
A 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.25%
A 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.25%
A 2015 Credit Facility [Member] | Term Loan [Member]
Debt Instrument, Face Amount	$ 308,400
Debt Instrument, Term (Year)	5 years
Debt Instrument, Interest Rate, Effective Percentage	3.71%
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 225,000
Debt Instrument, Term (Year)	5 years
Proceeds from (Repayments of) Debt, Total	$ 34,000
A 2015 Credit Facility [Member] | Insurance Carries Collateral [Member]
Letters of Credit Outstanding, Amount	12,200
A 2015 Credit Facility [Member] | Working Performance Obligation [Member]
Letters of Credit Outstanding, Amount	$ 12,900

Note 8 - Long-term Debt and C_4

Note 8 - Long-term Debt and Credit Facility - Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Long term debt	$ 303,668	$ 278,520
Less – Current maturities of long-term debt	29,735	32,803
Less – Unamortized loan costs	1,923	2,088
Total	272,010	243,629
Medium-term Notes [Member]
Long term debt	245,000	253,750
Line of Credit [Member]
Long term debt	58,000	24,000
Notes Payable, Other Payables [Member]
Long term debt	$ 668	$ 770

Note 8 - Long-term Debt and C_5

Note 8 - Long-term Debt and Credit Facility - Long-term Debt (Details) (Parentheticals)	Mar. 31, 2020	Dec. 31, 2019
Medium-term Notes [Member]
Current effective interest rate	3.35%	4.09%
Line of Credit [Member]
Current effective interest rate	3.11%	4.01%
Notes Payable, Other Payables [Member] | Minimum [Member]
Current effective interest rate	3.30%	3.30%
Notes Payable, Other Payables [Member] | Maximum [Member]
Current effective interest rate	7.80%	7.80%

Note 9 - Stockholders' Equity_3

Note 9 - Stockholders' Equity and Equity Compensation (Details Textual) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020USD ($)$ / sharesshares	Mar. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2019shares	Apr. 30, 2019shares	Dec. 31, 2018shares	Apr. 30, 2018shares
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $	$ 16.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 3 months 7 days
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
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)	1,598,572
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)	319,168
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
Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	7 years
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Current Stock Awards [Member]
Share-based Payment Arrangement, Expense | $	$ 1.8	$ 2
Deferred Stock Units [Member]
Share-based Payment Arrangement, Expense | $	0.3	$ 0.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $	$ 0.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 month 6 days
Amended Credit Facility [Member]
Stock Repurchase Program, Authorized Amount | $	$ 40
Credit Facility Minimum Consolidated Leverage Ratio	2.50
The 2019 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)	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
In Connection With Equity Compensation Programs [Member]
Stock Repurchase Program, Authorized Amount | $	$ 10
Stock Repurchased During Period, Shares (in shares)	80,129	152,946
Stock Repurchased During Period, Value | $	$ 1.8	$ 3.1
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares	$ 22.87	$ 20.48
Through The Open Market Repurchase Program [Member]
Stock Repurchased During Period, Shares (in shares)	180,491	622,043
Stock Repurchased During Period, Value | $	$ 3.2	$ 11.1
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares	$ 17.80	$ 17.82

Note 9 - Stockholders' Equity_4

Note 9 - Stockholders' Equity and Equity Compensation - Summary of Stock Award Activity (Details)	3 Months Ended
	Mar. 31, 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	1,080,554
Weighted average award date fair value (in dollars per share) | $ / shares	$ 22.53
Restricted Stock Units (RSUs) [Member]
Awards, grants during period (in shares) | shares	229,971
Weighted average award date fair value, award granted (in dollars per share) | $ / shares	$ 22.96
Awards, distributed during period (in shares) | shares	(152,596)
Weighted average award date fair value, award distributed (in dollars per share) | $ / shares	$ 23.15
Awards, forfeited during period (in shares) | shares	(15,717)
Weighted average award date fair value, award forfeited (in dollars per share) | $ / shares	$ 20.84
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)	3 Months Ended
	Mar. 31, 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	1,080,554
Weighted average award date fair value (in dollars per share) | $ / shares	$ 22.53
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	2,238
Weighted average award date fair value, award granted (in dollars per share) | $ / shares	$ 22.11
Awards, distributed during period (in shares) | shares	0
Weighted average award date fair value, award distributed (in dollars per share) | $ / shares	$ 0
Stock Awards, Outstanding (in shares) | shares	255,578
Weighted average award date fair value (in dollars per share) | $ / shares	$ 20.72

Note 10 - Taxes on Income (Deta

Note 10 - Taxes on Income (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Effective Income Tax Rate Reconciliation, Percent, Total	13.60%	16.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount	$ 0.4
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent, Total	31.60%

Note 12 - Segment Reporting (De

Note 12 - Segment Reporting (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)		Mar. 31, 2019USD ($)
Number of Reportable Segments	3
Restructuring 2017 [Member]
Restructuring Charges, Total	$ 3,623	[1]	$ 2,866	[2]
Restructuring 2017 [Member] | Corporate, Non-Segment [Member]
Restructuring Charges, Total	1,270		354
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corporate, Non-Segment [Member]
Restructuring Charges, Total	700		400
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Divestiture of International Operations [Member] | Corporate, Non-Segment [Member]
Restructuring Charges, Total	700
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Infrastructure Solutions [Member]
Restructuring Charges, Total	500		2,100
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Infrastructure Solutions [Member] | Divestiture of International Operations [Member]
Restructuring Charges, Total	200		100
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corrosion Protection [Member]
Restructuring Charges, Total	1,800		200
Restructuring 2017 [Member] | Other Expense [Member]
Restructuring Charges, Total	631	[1]	176	[2]
Restructuring 2017 [Member] | Other Expense [Member] | Corporate, Non-Segment [Member]
Restructuring Charges, Total	614		$ 0
Restructuring 2017 [Member] | Other Expense [Member] | Divestiture of International Operations [Member]
Restructuring Charges, Total	$ 400
[1]	Total pre-tax restructuring charges for the quarter ended March 31, 2020, include cash charges of $3.1 million and non-cash charges of $0.5 million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.
[2]	Total pre-tax restructuring charges for the quarter ended March 31, 2019, include cash charges of $3.1 million and non-cash charges of (0.2) million. Cash charges consist of charges incurred during the quarter that will be settled in cash, either during the current period or future periods.

Note 12 - Segment and Geographi

Note 12 - Segment and Geographic Information - Summary of Revenues (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Revenues	[1]	$ 287,375	$ 276,904
Gross profit	[1]	49,884	48,295
Total operating income (loss)		1,396	(774)
Interest expense		(3,196)	(3,590)
Interest income		228	285
Other	[2]	425	(674)
Total other expense		(2,543)	(3,979)
Loss before taxes on income		(1,147)	(4,753)
UNITED STATES
Revenues	[1]	233,220	208,775
Gross profit	[1]	39,636	31,827
CANADA
Revenues	[1]	21,855	24,068
Gross profit	[1]	2,731	3,454
Europe [Member]
Revenues	[1]	10,671	16,003
Gross profit	[1]	2,948	3,519
Other Foreign Countries [Member]
Revenues	[1]	21,629	28,058
Gross profit	[1]	4,569	9,495
Infrastructure Solutions [Member]
Revenues		130,244	131,543
Infrastructure Solutions [Member] | UNITED STATES
Revenues		103,418	97,891
Infrastructure Solutions [Member] | CANADA
Revenues		11,023	10,611
Infrastructure Solutions [Member] | Europe [Member]
Revenues		7,642	12,525
Infrastructure Solutions [Member] | Other Foreign Countries [Member]
Revenues		8,161	10,516
Corrosion Protection [Member]
Revenues		66,068	64,498
Corrosion Protection [Member] | UNITED STATES
Revenues		38,739	30,021
Corrosion Protection [Member] | CANADA
Revenues		10,832	13,457
Corrosion Protection [Member] | Europe [Member]
Revenues		3,029	3,478
Corrosion Protection [Member] | Other Foreign Countries [Member]
Revenues		13,468	17,542
Energy Services [Member]
Revenues		91,063	80,863
Energy Services [Member] | UNITED STATES
Revenues		91,063	80,863
Energy Services [Member] | CANADA
Revenues		0	0
Energy Services [Member] | Europe [Member]
Revenues		0	0
Energy Services [Member] | Other Foreign Countries [Member]
Revenues		0	0
Operating Segments [Member] | Infrastructure Solutions [Member]
Revenues		130,244	131,543
Gross profit		31,370	26,586
Total operating income (loss)	[3]	13,555	5,715
Operating Segments [Member] | Corrosion Protection [Member]
Revenues		66,068	64,498
Gross profit		8,917	12,873
Total operating income (loss)	[4]	(6,447)	(1,760)
Operating Segments [Member] | Energy Services [Member]
Revenues		91,063	80,863
Gross profit		9,597	8,836
Total operating income (loss)		2,176	1,115
Corporate, Non-Segment [Member]
Total operating income (loss)	[5]	$ (7,888)	$ (5,844)
[1]	Revenues and gross profit are attributed to the country of origin
[2]	Other expense in the first quarters of 2020 and 2019 includes $0.6 million and $0.2 million of restructuring charges (see Note 4). Other expense in the first quarter of 2020 also includes gains of $0.4 million related to divestitures of Insituform Australia and Insituform Spain (see Note 1).
[3]	Operating income in the first quarters of 2020 and 2019 includes $0.5 million and $2.1 million, respectively, of restructuring charges (see Note 4) and $0.2 million and $0.1 million, respectively, of costs primarily related to the divestiture of certain international operations.
[4]	Operating loss in the first quarters of 2020 and 2019 includes $1.8 million and $0.2 million, respectively, of restructuring charges (see Note 4).
[5]	Operating loss in the first quarters of 2020 and 2019 includes $0.7 million and $0.4 million, respectively, of restructuring charges (see Note 4). Operating loss in the first quarter of 2020 also includes $0.7 million of costs related to the divestiture of certain international operations.

Note 13 - Derivative Financia_3

Note 13 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 12, 2018	Oct. 31, 2015
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ (200)
Derivative, Fixed Interest Rate				2.937%
A 2015 Interest Rate Swap [Member]
Derivative, Fixed Interest Rate					1.46%
Derivative Asset, Notional Amount					$ 262,500
A 2018 Interest Rate Swap [Member]
Derivative, Amount of Hedged Item				$ 170,600
Derivative, Fixed Interest Rate				2.937%
Derivative Asset, Notional Amount				$ 170,600
A 2015 Credit Facility [Member]
Derivative, Amount of Hedged Item					262,500
Line of Credit Facility, Maximum Borrowing Capacity					$ 350,000
A 2018 Credit Facility [Member]
Derivative Asset, Notional Amount				$ 170,600
Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, Total		$ (10,458)	$ (4,638)
Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, Total		$ 10,500	$ (4,600)

Note 13 - Derivative Financia_4

Note 13 - Derivative Financial Instruments - Summary of Derivative Positions (Details) - Interest Rate Swap [Member]	3 Months Ended
	Mar. 31, 2020USD ($)
Notional amount	$ 183,750,000
Weighted average remaining maturities (Year)	2 years 9 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	Mar. 31, 2020	Dec. 31, 2019
Derivative assets	$ 0	$ 261
Derivative liabilities	10,458	4,899
Net Derivative Asset (Liability)	(10,458)	(4,638)
Other Noncurrent Assets [Member] | Interest Rate Swap [Member]
Derivative assets	0	261
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member]
Derivative liabilities	$ 10,458	$ 4,899

Note 14 - Subsequent Events (De

Note 14 - Subsequent Events (Details Textual) $ in Millions	Apr. 29, 2020USD ($)	Mar. 31, 2020USD ($)	Mar. 31, 2021	Feb. 28, 2023	Sep. 30, 2021	Jun. 30, 2021USD ($)	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Oct. 31, 2015USD ($)
Forecast [Member]
Share-based Compensation, Maximum Awards Available, Value						$ 5
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.75%
A 2015 Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity										$ 350
Debt Instrument, Face Amount										$ 650
Credit Facility Maximum Consolidated Leverage Ratio		3.25
Credit Facility Minimum Consolidated Fixed Charge Ratio		1.25
A 2015 Credit Facility [Member] | Forecast [Member]
Credit Facility Maximum Consolidated Leverage Ratio			4		3	3.50	4.50	4.75	4
Credit Facility Minimum Consolidated Fixed Charge Ratio			1.15			1.25			1.10
A 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate		1.25%
A 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate		2.25%
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]
Debt Instrument, Face Amount		$ 308.4
A 2015 Credit Facility [Member] | Subsequent Event [Member] | Term Loan [Member]
Debt Instrument, Face Amount	$ 245
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 225
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity	175
Payments of Financing Costs, Total	2.1
Credit Facility, Maximum Additional Expected Borrowing Capacity	$ 100
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member] | Minimum [Member]
Credit Facility Consolidated Leverage Ratio for Zero Share Repurchases	3
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member] | Minimum [Member] | Leverage Ratio for $20.0 Million of Share Repurchases [Member]
Credit Facility Consolidated Leverage Ratio for 20 Million Share Repurchases	2.50
A 2015 Credit Facility [Member] | Revolving Credit Facility [Member] | Subsequent Event [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