Mistras (MG) 10-Q 10 Aug 20 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-34481
Entity Registrant Name	Mistras Group, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-3341267
Entity Address, Address Line One	195 Clarksville Road
Entity Address, City or Town	Princeton Junction,
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08550
City Area Code	609
Local Phone Number	716-4000
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	MG
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		29,110,362
Entity Central Index Key	0001436126
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 22,588	$ 15,016
Accounts receivable, net	103,698	135,997
Inventories	14,267	13,413
Prepaid expenses and other current assets	13,045	14,729
Total current assets	153,598	179,155
Property, plant and equipment, net	93,238	98,607
Intangible assets, net	70,848	109,537
Goodwill	199,277	282,410
Deferred income taxes	1,781	1,786
Other assets	48,936	48,383
Total assets	567,678	719,878
Current Liabilities
Accounts payable	8,239	15,033
Accrued expenses and other current liabilities	77,308	81,389
Current portion of long-term debt	8,735	6,593
Current portion of finance lease obligations	3,642	4,131
Income taxes payable	2,569	2,094
Total current liabilities	100,493	109,240
Long-term debt, net of current portion	230,661	248,120
Obligations under finance leases, net of current portion	11,964	13,043
Deferred income taxes	6,574	21,290
Other long-term liabilities	41,523	42,163
Total liabilities	391,215	433,856
Commitments and contingencies
Equity
Preferred stock, 10,000,000 shares authorized	0	0
Common stock, $0.01 par value, 200,000,000 shares authorized, 29,110,362 and 28,945,472 shares issued	291	289
Additional paid-in capital	231,724	229,205
Retained earnings (deficit)	(23,552)	77,613
Accumulated other comprehensive loss	(32,172)	(21,285)
Total Mistras Group, Inc. stockholders’ equity	176,291	285,822
Non-controlling interests	172	200
Total equity	176,463	286,022
Total liabilities and equity	$ 567,678	$ 719,878

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	29,110,362	28,945,472

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements of Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 124,435	$ 200,616	$ 283,900	$ 377,403
Cost of revenue	77,954	135,063	191,278	257,480
Depreciation	5,323	5,482	10,820	10,978
Gross profit	41,158	60,071	81,802	108,945
Selling, general and administrative expenses	37,607	41,923	79,165	83,686
Bad debt provision for troubled customers, net of recoveries	0	(2,693)	0	2,798
Impairment charges	0	0	106,062	0
Pension withdrawal expense	0	0	0	534
Research and engineering	708	754	1,532	1,611
Depreciation and amortization	3,207	4,119	7,177	8,291
Acquisition-related expense (benefit), net	19	549	(523)	1,002
Income (loss) from operations	(383)	15,419	(111,611)	11,023
Interest expense	2,976	3,579	5,765	7,106
Income (loss) before provision (benefit) for income taxes	(3,359)	11,840	(117,376)	3,917
Provision (benefit) for income taxes	(694)	4,397	(16,189)	1,760
Net income (loss)	(2,665)	7,443	(101,187)	2,157
Less: Net income (loss) attributable to non-controlling interests, net of taxes	(9)	12	(22)	19
Net income (loss) attributable to Mistras Group, Inc.	$ (2,656)	$ 7,431	$ (101,165)	$ 2,138
Earnings (loss) per common share:
Basic (in dollars per share)	$ (0.09)	$ 0.26	$ (3.49)	$ 0.07
Diluted (in dollars per share)	$ (0.09)	$ 0.26	$ (3.49)	$ 0.07
Weighted-average common shares outstanding:
Basic (in shares)	29,085	28,657	29,024	28,616
Diluted (in shares)	29,085	28,862	29,024	28,918

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (2,665)	$ 7,443	$ (101,187)	$ 2,157
Other comprehensive income (loss):
Foreign currency translation adjustments	6,122	3,649	(10,887)	5,780
Comprehensive income (loss)	3,457	11,092	(112,074)	7,937
Less: comprehensive income (loss) attributable to non-controlling interest	(9)	10	(28)	19
Comprehensive income (loss) attributable to Mistras Group, Inc.	$ 3,466	$ 11,082	$ (112,046)	$ 7,918

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Total Mistras Group, Inc. Stockholders’ Equity	Common Stock	Additional paid-in capital	Retained earnings (deficit)	Accumulated other comprehensive income (loss)	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2018			28,563
Beginning balance at Dec. 31, 2018	$ 271,074	$ 270,897	$ 285	$ 226,616	$ 71,553	$ (27,557)	$ 177
Increase (Decrease) in Stockholders' Equity
Net loss	2,157	2,138			2,138		19
Other comprehensive income, net of tax	5,780	5,780				5,780
Share-base payments (in shares)			119
Share-based payments	2,917	2,917	$ 1	2,916
Net settlement of restricted stock units	$ (681)	(681)		(681)
Exercise of stock options (in shares)	4		3
Exercise of stock options	$ 32	32		32
Ending balance (in shares) at Jun. 30, 2019			28,685
Ending balance at Jun. 30, 2019	281,279	281,083	$ 286	228,883	73,691	(21,777)	196
Beginning balance (in shares) at Mar. 31, 2019			28,627
Beginning balance at Mar. 31, 2019	269,096	268,910	$ 286	227,790	66,260	(25,426)	186
Increase (Decrease) in Stockholders' Equity
Net loss	7,443	7,431			7,431		12
Other comprehensive income, net of tax	3,647	3,649				3,649	(2)
Share-base payments (in shares)			58
Share-based payments	1,490	1,490		1,490
Net settlement of restricted stock units	(397)	(397)		(397)
Ending balance (in shares) at Jun. 30, 2019			28,685
Ending balance at Jun. 30, 2019	281,279	281,083	$ 286	228,883	73,691	(21,777)	196
Beginning balance (in shares) at Dec. 31, 2019			28,945
Beginning balance at Dec. 31, 2019	286,022	285,822	$ 289	229,205	77,613	(21,285)	200
Increase (Decrease) in Stockholders' Equity
Net loss	(101,187)	(101,165)			(101,165)		(22)
Other comprehensive income, net of tax	(10,893)	(10,887)				(10,887)	(6)
Share-based payments	2,798	2,798		2,798
Net settlements of restricted stock units (in shares)			165
Net settlement of restricted stock units	$ (277)	(277)	$ 2	(279)
Exercise of stock options (in shares)	0
Ending balance (in shares) at Jun. 30, 2020			29,110
Ending balance at Jun. 30, 2020	$ 176,463	176,291	$ 291	231,724	(23,552)	(32,172)	172
Beginning balance (in shares) at Mar. 31, 2020			29,042
Beginning balance at Mar. 31, 2020	171,753	171,572	$ 290	230,472	(20,896)	(38,294)	181
Increase (Decrease) in Stockholders' Equity
Net loss	(2,665)	(2,656)			(2,656)		(9)
Other comprehensive income, net of tax	6,122	6,122				6,122
Share-based payments	1,373	1,373		1,373
Net settlements of restricted stock units (in shares)			68
Net settlement of restricted stock units	(120)	(120)	$ 1	(121)
Ending balance (in shares) at Jun. 30, 2020			29,110
Ending balance at Jun. 30, 2020	$ 176,463	$ 176,291	$ 291	$ 231,724	$ (23,552)	$ (32,172)	$ 172

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Cash flows from operating activities
Net loss	$ (2,665)	$ 7,443	$ (101,187)		$ 2,157
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	8,530	9,601	17,997		19,269
Impairment charges	0	0	106,062		0
Deferred income taxes			(14,327)		420
Share-based compensation expense			2,740		2,867
Bad debt provision for troubled customers, net of recoveries	0	(2,693)	0		2,798
Fair value adjustments to contingent consideration			(523)		672
Foreign currency (gain) loss			1,067		(1,218)
Other			1,179		(395)
Changes in operating assets and liabilities, net of effect of acquisitions and dispositions
Accounts receivable			30,228		(8,792)
Inventories			(1,300)		(594)
Prepaid expenses and other assets			(1,426)		(625)
Accounts payable			(6,536)		4,945
Accrued expenses and other liabilities			347		(988)
Income taxes payable			541		589
Net cash provided by operating activities			34,862		21,105
Cash flows from investing activities
Purchase of property, plant and equipment			(7,443)		(11,562)
Purchase of intangible assets			(195)		(441)
Proceeds from sale of equipment			390		955
Net cash used in investing activities			(7,248)		(11,048)
Cash flows from financing activities
Repayment of finance lease obligations			(2,132)		(2,411)
Proceeds from borrowings of long-term debt			1,605		566
Repayment of long-term debt			(2,983)		(3,445)
Proceeds from revolver			16,500		10,000
Repayment of revolver			(30,250)		(27,200)
Payment of financing costs			(1,497)		0
Payment of contingent consideration for business acquisitions			(1,303)		0
Taxes paid related to net share settlement of share-based awards			(277)		(681)
Proceeds from exercise of stock options			0		32
Net cash used in financing activities			(20,337)		(23,139)
Effect of exchange rate changes on cash and cash equivalents			295		39
Net change in cash and cash equivalents			7,572		(13,043)
Cash and cash equivalents at beginning of period			15,016	$ 12,501	25,544
Cash and cash equivalents at end of period	$ 22,588	$ 12,501	22,588	$ 15,016	12,501
Supplemental disclosure of cash paid
Interest			5,554		7,016
Income taxes, net of refunds			(70)		2,565
Noncash investing and financing
Equipment acquired through finance lease obligations			$ 1,266		$ 2,887

Description of Business_and Bas

Description of Business and Basis of Presentation	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Description of Business Mistras Group, Inc. and subsidiaries ("the Company") is a leading “one source” global provider of technology-enabled asset protection solutions used to evaluate the structural integrity and reliability of critical energy, industrial, public infrastructure and commercial aerospace components. The Company combines industry-leading products and technologies, expertise in mechanical integrity (MI), non-destructive testing (NDT) and mechanical services and proprietary data analysis software to deliver a comprehensive portfolio of customized solutions, ranging from routine inspections to complex, plant-wide asset integrity assessments and management. These mission critical solutions enhance customers’ ability to extend the useful life of their assets, increase productivity, minimize repair costs, comply with governmental safety and environmental regulations, manage risk and avoid catastrophic disasters. The Company serves a global customer base of companies with asset-intensive infrastructure, including companies in the oil and gas, commercial aerospace and defense, fossil and nuclear power, alternative and renewable energy, public infrastructure, chemicals, transportation, primary metals and metalworking, pharmaceutical/biotechnology and food processing industries and research and engineering institutions. Recent Developments In March 2020, the World Health Organization declared the outbreak of a novel coronavirus (COVID-19) as a pandemic, which continues to spread throughout the United States. The COVID-19 pandemic has caused significant volatility in domestic and international markets. There is on-going uncertainty around the breadth and duration of business disruptions related to COVID-19, as well as its impact on the U.S. and international economies. In addition, oil prices have dropped significantly, and airline traffic has experienced a significant decline. In response to the COVID-19 pandemic, companies within the oil and gas and aerospace industries (including our customers) have announced spending cuts and/or slowdowns (or temporary cessation) in production which, in turn, may result in decreases in awards of new contracts or adjustments, reductions, suspensions or cancellations of existing contracts. These declines were driven in large measure by various factors surrounding the COVID-19 pandemic and, in the case of the oil and gas market, other macroeconomic events such as the geopolitical tensions between OPEC and Russia. The COVID-19 pandemic, significant volatility in oil prices and decreased traffic in the aerospace industry have adversely affected the Company's workforce and operations, as well as the operations of its customers, suppliers and contractors. These negative factors have also resulted in significant volatility and uncertainty in the markets in which the Company operates. To successfully navigate through this unprecedented period, the Company continues to focus on the following key priorities: • Ensuring the health and safety of its employees and those of its customers and suppliers; • Maintaining business continuity and financial strength and stability; and • Serving its customers as they provide essential products and services to the world. While the Company cannot fully assess the impact that the factors discussed above will have on its operations at this time, there are certain impacts that the Company has identified: • The financial market volatility that resulted from COVID-19 and the volatility in oil prices required the Company to reassess the goodwill it had recorded related to various prior acquisitions under the guidance of ASC 350 during the first quarter of 2020. The Company determined that the fair values of various reporting units were less than their carrying values (including goodwill). As a result, the Company recorded an impairment charge related to goodwill of approximately $77.1 million during the three months ended March 31, 2020. See Note 8– Goodwill . • These same events required the Company to reassess the tangible and intangible assets recorded under the guidance of ASC 360 during the first quarter of 2020. The Company determined that the fair values of certain asset groups were less than their carrying values (excluding goodwill). As a result, the Company recorded impairment charges related to intangible assets of approximately $28.8 million and a right-of-use asset of approximately $0.2 million during the three months ended March 31, 2020. See Note 9– Intangible Assets and Note 13– Leases . To respond to the economic downturn resulting from the factors discussed above, in March 2020 the Company initiated a cost reduction and efficiency program. As part of this program, named executive officers of the Company have voluntarily taken temporary salary reductions ranging from 25% to 45% of their base salary. In addition, the Company instituted a reduction for certain other salaried employees, at lower percentages, and suspended the Company's voluntary match under the Company sponsored savings plans for its U.S. and Canadian employees. These reductions became effective at the beginning of the second quarter of 2020 and, except for the salary reductions for certain lower salaried employees, will continue through the third quarter. At the end of the third quarter, management will assess whether to change these cost saving measures. In addition, the Company’s non-employee directors voluntarily agreed to a $3,750 reduction in their second and third quarter 2020 payments. The Company is currently unable to predict with certainty the overall impact that the factors discussed above may have on its business, results of operations, liquidity or in other ways which the Company cannot yet determine. The Company will continue to monitor market conditions and respond accordingly. Basis of Presentation The Unaudited Condensed Consolidated Financial Statements contained in this report have been prepared in conformity with U.S. generally accepted accounting principles ("GAAP"). In the opinion of management, the Unaudited Condensed Consolidated Financial Statements include all adjustments, which are of a normal recurring nature, necessary for a fair presentation of the results for the interim periods of the years ending December 31, 2020 and December 31, 2019. Certain items included in these statements are based on management’s estimates. Actual results may differ from those estimates. The results of operations for any interim period are not necessarily indicative of the results expected for the year. The accompanying Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the notes to the Audited Consolidated Financial Statements contained in the Company's 2019 Annual Report on Form 10-K ("2019 Annual Report"). Principles of Consolidation The accompanying Unaudited Condensed Consolidated Financial Statements include the accounts of Mistras Group, Inc. and its wholly and majority-owned subsidiaries. For subsidiaries in which the Company’s ownership interest is less than 100%, the non-controlling interests are reported in stockholders’ equity in the accompanying Condensed Consolidated Balance Sheets. The non-controlling interests in net results, net of tax, is classified separately in the accompanying Unaudited Condensed Consolidated Statements of Income (Loss). All significant intercompany accounts and transactions have been eliminated in consolidation. Reclassification Certain amounts in prior periods have been reclassified to conform to the current year presentation. Such reclassifications did not have a material effect on the Company's financial condition or results of operations as previously reported. Customers For each of the three and six months ended June 30, 2020 and 2019, no customer represented 10% or more of the Company's revenue. Significant Accounting Policies The Company’s significant accounting policies are disclosed in Note 1– Summary of Significant Accounting Policies and Practices in the 2019 Annual Report. On an ongoing basis, the Company evaluates its estimates and assumptions, including among other things, those related to revenue recognition, long-lived assets, goodwill and acquisitions. Since the date of the 2019 Annual Report, there have been no material changes to the Company's significant accounting policies. Income Taxes Income taxes are accounted for under the asset and liability method. Deferred income tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and tax credit carry-forwards. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred income tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided if it is more likely than not that some or all of a deferred income tax asset will not be realized. Financial accounting standards prescribe a minimum recognition threshold a tax position is required to meet before being recognized in the financial statements. These standards also provide guidance on de-recognition, measurement, and classification of amounts relating to uncertain tax positions, accounting for and disclosure of interest and penalties, accounting in interim periods and disclosures required. Interest and penalties related to unrecognized tax positions are recognized as incurred within “provision for income taxes” in the consolidated statements of income. ASC 740-270, Income Taxes-Interim Reporting, requires the Company to use an estimated annual effective tax rate (EAETR) for calculating its tax provision for interim periods. At each interim period, the Company is required, with certain exceptions and limitations, to estimate its forecasted worldwide EAETR, which is applied to the Company's year-to-date consolidated ordinary income or loss resulting in the year-to-date income tax provision before considering items not included in ordinary income or loss. The tax effects of events or transactions not considered to represent ordinary income or loss are accounted for discretely in the interim period and are not included in the determination of the EAETR. In response to the COVID-19 pandemic, the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”) was signed into law on March 27, 2020. The CARES Act, among other things, includes tax provisions relating to deferment of employer’s social security payments, net operating loss utilization and carryback periods, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property (QIP). The ultimate impact of the CARES Act may differ from the estimated impact the Company recorded during this interim period due to changes in interpretations and guidance that may be issued and actions the Company may take in response to the CARES Act. The Company will continue to assess the impact that various provisions of the CARES Act, and how they are interpreted and effected, will have on its business. The Company continues to evaluate its deferred tax assets each period to determine if a valuation allowance is required based on whether it is more likely than not that some portion of these deferred tax assets will not be realized. As of June 30, 2020, management concluded that it is more likely than not that a substantial portion of the Company's deferred tax assets will be realized. As part of the Company's analysis, it considered both positive and negative factors that impact profitability and whether those factors would lead to a change in the estimate of the Company's deferred tax assets that may be realized in the future. In the current period, the impact of the COVID-19 pandemic on the Company's business was more pronounced given the pandemic spanned the full quarter. The Company will continue to monitor the impacts of the COVID-19 pandemic on its business, and any sustained or prolonged reductions in future earnings periods may change the Company's conclusions on whether it is more likely than not to realize portions of the Company's deferred tax assets. The Company’s effective income tax rate was approximately 21% and 37% for the three months ended June 30, 2020 and 2019, respectively. The Company’s effective income tax rate was approximately 14% and 45% for the six months ended June 30, 2020 and 2019, respectively. The effective income tax rate for the second quarter of 2020 approximated the statutory rate, as the favorable impact of the CARES Act was offset by the unfavorable impact of taxes in other jurisdictions and other permanent book to tax differences. The effective income tax rate for the first six-months of 2020 was lower than the statutory rate primarily due to impairments for which the Company will not realize income tax benefits, partially offset by income tax benefits of the CARES Act. The CARES Act provides a five-year carryback of net operating losses generated in years 2018 through 2020. As the statutory federal income tax rate applicable to certain years within the carryback period is 35%, carryback to those years of the Company's estimated 2020 annual federal tax loss provides a tax benefit in excess of the current federal statutory rate of 21%, resulting in an increased income tax benefit. The Company projects that the income tax effects of the CARES Act will result in additional income tax benefit recognized throughout the 2020 tax year and a cash refund in 2021 of taxes paid in prior years. The effective income tax rate for the three and six months ended June 30, 2019 was higher than the statutory rate due to the impact of discrete items, the global intangible low-taxed income (GILTI), and executive compensation, and other provisions resulting from the December 22, 2017 passage of the Tax Cuts and Jobs Act and foreign tax rates different than statutory rates in the U.S. Recent Accounting Pronouncements In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). ASU 2019-12 simplifies the accounting for income taxes by eliminating certain exceptions related to the approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period, and the recognition of deferred tax liabilities related to outside basis differences. The standard is effective for interim and annual periods beginning January 1, 2021, with certain amendments applied prospectively and others requiring retrospective application. Early adoption is permitted, with any adjustments reflected as of the beginning of the fiscal year of adoption. If early adoption is elected, all changes as a result of the standard must be adopted in the same period. The Company is currently evaluating the impact of this guidance on its consolidated financial position, results of operations, and cash flows. In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The guidance provides optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another rate that is expected to be discontinued. The amendments in ASU 2020-04 are effective for all entities as of March 12, 2020 through December 31, 2022. The Company is currently evaluating the impact of this guidance on its consolidated financial position, results of operations, and cash flows.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue	Revenue The Company derives the majority of its revenue by providing services on a time and material basis, which are generally short-term in nature. The Company accounts for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers . 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 ASC Topic 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of the Company's contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and is, therefore, not distinct. The Company provides highly integrated and bundled inspection services to its customers. Some of the Company's contracts have multiple performance obligations, most commonly due to the contract providing both goods and services. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation using its best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate standalone selling price is a relative selling price based on price lists. Contract modifications are not routine in the performance of the Company contracts. Generally, when contracts are modified, the modification is to account for changes in scope to the goods and services that are provided. In most instances, contract modifications are for goods or services that are distinct, and, therefore, are accounted for as a separate contract. The Company's performance obligations are satisfied over time as work progresses or at a point in time. The majority of the Company's revenue recognized over time as work progresses is related to its service deliverables, which includes providing testing, inspection and mechanical services to the Company's customers. Revenue is recognized over time based on time and material incurred to date which best portrays the transfer of control to the customer. The Company also utilizes an available practical expedient that provides for revenue to be recognized in an amount that corresponds directly with the value to the customer of the entity’s performance completed to date. Fixed fee arrangements are determined based on expected labor, material, and overhead to be consumed on fulfillment of such services. Revenue is recognized on a cost-to-cost method tracked on an input basis. The majority of the Company's revenue recognized at a point in time is related to product sales when the customer obtains control of the asset, which is generally upon shipment to the customer. Contract costs include labor, material and overhead. The Company expects any significant remaining performance obligations to be satisfied within one year. Contract Estimates The majority of the Company's revenue are short-term in nature. The Company has many master service agreements (MSAs) that specify an overall framework and contract terms when the Company and customers agree upon services or products to be provided. The actual contracting to provide services or furnish products is triggered by a work order, purchase order, or some similar document issued pursuant to a MSA which sets forth the scope of services and/or identifies the products to be provided. From time-to-time, the Company may enter into long-term contracts, which can range from several months to several years. Revenue on such long-term contracts is recognized as work is performed based on total costs incurred to date in relation to the total estimated costs for the performance of the contract at completion. This includes contract estimates of costs to be incurred for the performance of the contract. Cost estimation is based upon the professional knowledge and experience of the Company's project managers, engineers and financial professionals. Factors that are considered in estimating the work to be completed include the availability of materials, the effect of any delays in the Company's project performance and the recoverability of any claims. Whenever revisions of estimates, contract costs and/or contract values indicate that the contract costs will exceed estimated revenue, thus creating a loss, a provision for the total estimated loss is recorded in that period. Revenue by Category The following series of tables present the Company's disaggregated revenue: Revenue by industry was as follows: Three Months Ended June 30, 2020 Services International Products Corp/Elim Total Oil & Gas $ 59,279 $ 7,339 $ 68 $ — $ 66,686 Aerospace & Defense 14,248 3,595 151 — 17,994 Industrials 10,298 3,817 419 — 14,534 Power generation & Transmission 7,652 1,207 644 — 9,503 Other Process Industries 4,999 2,610 74 — 7,683 Infrastructure, Research & Engineering 2,994 2,020 1,900 — 6,914 Other 1,207 755 746 (1,587) 1,121 Total $ 100,677 $ 21,343 $ 4,002 $ (1,587) $ 124,435 Three Months Ended June 30, 2019 Services International Products Corp/Elim Total Oil & Gas $ 109,103 $ 11,767 $ 465 $ — $ 121,335 Aerospace & Defense 13,511 10,504 315 — 24,330 Industrials 19,638 5,459 647 — 25,744 Power generation & Transmission 8,352 2,499 619 — 11,470 Other Process Industries 6,384 2,504 68 — 8,956 Infrastructure, Research & Engineering 2,806 2,517 1,059 — 6,382 Other 1,416 1,840 1,096 (1,953) 2,399 Total $ 161,210 $ 37,090 $ 4,269 $ (1,953) $ 200,616 Six Months Ended June 30, 2020 Services International Products Corp/Elim Total Oil & Gas $ 142,578 $ 16,443 $ 163 $ — $ 159,184 Aerospace & Defense 28,900 11,010 298 — 40,208 Industrials 23,165 8,736 907 — 32,808 Power generation & Transmission 12,747 2,904 1,498 — 17,149 Other Process Industries 11,003 4,730 77 — 15,810 Infrastructure, Research & Engineering 7,511 4,481 2,460 — 14,452 Other 3,646 2,106 1,411 (2,874) 4,289 Total $ 229,550 $ 50,410 $ 6,814 $ (2,874) $ 283,900 Six Months Ended June 30, 2019 Services International Products Corp/Elim Total Oil & Gas $ 200,769 $ 21,472 $ 480 $ — $ 222,721 Aerospace & Defense 26,305 22,158 622 — 49,085 Industrials 35,762 10,534 1,079 — 47,375 Power generation & Transmission 14,614 3,921 2,000 — 20,535 Other Process Industries 12,702 4,746 73 — 17,521 Infrastructure, Research & Engineering 5,396 5,250 1,905 — 12,551 Other 5,959 4,171 1,542 (4,057) 7,615 Total $ 301,507 $ 72,252 $ 7,701 $ (4,057) $ 377,403 Revenue per key geographic location was as follows: Three Months Ended June 30, 2020 Services International Products Corp/Elim Total United States $ 88,205 $ 160 $ 2,053 $ (810) $ 89,608 Other Americas 12,046 959 72 (93) 12,984 Europe 263 20,031 588 (662) 20,220 Asia-Pacific 163 193 1,289 (22) 1,623 Total $ 100,677 $ 21,343 $ 4,002 $ (1,587) $ 124,435 Three Months Ended June 30, 2019 Services International Products Corp/Elim Total United States $ 131,880 $ 57 $ 2,977 $ (1,274) $ 133,640 Other Americas 28,804 1,686 71 (207) 30,354 Europe 271 33,740 436 (472) 33,975 Asia-Pacific 255 1,607 785 — 2,647 Total $ 161,210 $ 37,090 $ 4,269 $ (1,953) $ 200,616 Six Months Ended June 30, 2020 Services International Products Corp/Elim Total United States $ 197,786 $ 314 $ 3,612 $ (1,521) $ 200,191 Other Americas 30,781 2,464 350 (246) 33,349 Europe 371 46,266 928 (1,041) 46,524 Asia-Pacific 612 1,366 1,924 (66) 3,836 Total $ 229,550 $ 50,410 $ 6,814 $ (2,874) $ 283,900 Six Months Ended June 30, 2019 Services International Products Corp/Elim Total United States $ 245,015 $ 334 $ 4,947 $ (2,554) $ 247,742 Other Americas 55,513 3,915 137 (264) 59,301 Europe 698 65,280 857 (1,235) 65,600 Asia-Pacific 281 2,723 1,760 (4) 4,760 Total $ 301,507 $ 72,252 $ 7,701 $ (4,057) $ 377,403 Contract Balances The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) on the Condensed Consolidated Balance Sheets. Amounts are generally billed as work progresses in accordance with agreed-upon contractual terms, generally at periodic intervals (e.g., weekly, bi-weekly or monthly). Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. However, the Company sometimes receives advances or deposits from its customers before revenue is recognized, resulting in contract liabilities. These assets and liabilities are aggregated on an individual contract basis and reported on the Condensed Consolidated Balance Sheets at the end of each reporting period within accounts receivables or accrued expenses and other current liabilities. Revenue recognized during the six months ended June 30, 2020 and 2019 that was included in the contract liability balance at the beginning of such year was $3.2 million and $2.7 million, respectively. Changes in the contract asset and liability balances during these periods were not materially impacted by any other factors. The Company has elected to utilize a practical expedient to expense incremental costs incurred related to obtaining a contract. The Company’s expenses are expected to be amortized over a period less than one year.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2020
Share-based Payment Arrangement [Abstract]
Share-Based Compensation	Share-Based Compensation The Company has share-based incentive awards outstanding to its eligible employees and non-employee directors under two equity incentive plans: (i) the 2009 Long-Term Incentive Plan (the "2009 Plan") and (ii) the 2016 Long-Term Incentive Plan (the "2016 Plan"). No further awards may be granted under the 2009 Plan, although awards granted under the 2009 Plan remain outstanding in accordance with their terms. Awards granted under the 2016 Plan may be in the form of stock options, restricted stock units and other forms of share-based incentives, including performance restricted stock units, stock appreciation rights and deferred stock rights. At the annual shareholders meeting on May 19, 2020, the Company’s shareholders approved an amendment to increase the total number of shares that may be issued under the 2016 Plan by 2 million, for a total of 3.7 million shares that may be issued under the 2016 Plan. Stock Options For the three and six months ended June 30, 2020 and 2019, the Company did not recognize any share-based compensation expense related to stock option awards, as all outstanding stock options awards were then already fully vested. No unrecognized compensation costs remained related to stock option awards as of June 30, 2020. The following table sets forth a summary of the stock option activity, weighted-average exercise prices and options outstanding as of June 30, 2020 and June 30, 2019: Six months ended June 30, 2020 2019 Common Stock Options Weighted Average Exercise Price Common Stock Options Weighted Average Exercise Price Outstanding at beginning of period: 5 $ 22.35 2,105 $ 13.47 Granted — $ — — $ — Exercised — $ — (4) $ 10.00 Expired or forfeited — $ — (7) $ 10.00 Outstanding at end of period: 5 $ 22.35 2,094 $ 13.48 Restricted Stock Unit Awards For the three months ended June 30, 2020 and June 30, 2019, the Company recognized share-based compensation expense related to restricted stock unit awards of $1.4 million and $1.1 million, respectively. For the six months ended June 30, 2020 and June 30, 2019, the Company recognized share-based compensation expense related to restricted stock unit awards of $2.1 million and $2.0 million, respectively. As of June 30, 2020, there was $6.6 million of unrecognized compensation costs, net of estimated forfeitures, related to restricted stock unit awards, which is expected to be recognized over a remaining weighted-average period of 2.3 years. Upon vesting, restricted stock units are generally net share-settled to cover the required withholding tax and the remaining amount is converted into an equivalent number of shares of common stock. A summary of the vesting activity of restricted stock unit awards, with the respective fair value of the awards, is as follows: Six months ended June 30, 2020 2019 Restricted stock awards vested 143 77 Fair value of awards vested $ 542 $ 1,052 A summary of the fully-vested common stock the Company issued to its six non-employee directors, in connection with its non-employee director compensation plan, is as follows: Six months ended June 30, 2020 2019 Awards issued 15 15 Grant date fair value of awards issued $ 57 $ 210 A summary of the Company's outstanding, non-vested restricted share units is as follows: Six months ended June 30, 2020 2019 Units Weighted Units Weighted Outstanding at beginning of period: 559 $ 16.92 443 $ 20.55 Granted 557 $ 3.77 334 $ 14.04 Released (143) $ 16.74 (77) $ 19.88 Forfeited (14) $ 13.74 (23) $ 19.35 Outstanding at end of period: 959 $ 9.35 677 $ 17.46 Performance Restricted Stock Units The Company maintains Performance Restricted Stock Units (PRSUs) that have been granted to select executives and senior officers whose ultimate payout is based on the Company’s performance over a one-year period based on specific metrics approved by the Compensation Committee of the Board of Directors of the Company. For 2019, three metrics, as defined: (1) Operating Income, (2) Adjusted EBITDAS (defined as net income attributable to MISTRAS Group, Inc. plus: interest expense, provision for income taxes, depreciation and amortization, share-based compensation expense and certain acquisition related costs (including transaction due diligence costs and adjustments to the fair value of contingent consideration), foreign exchange (gain) loss and, if applicable, certain special items which are noted) and (3) Revenue. There also is a discretionary portion of the PRSUs based on individual performance, granted at the discretion of the Compensation Committee (Discretionary PRSUs). PRSUs and Discretionary PRSUs generally vest ratably on each of the first four anniversary dates upon completion of the performance period, for a total requisite service period of up to five years and have no dividend rights. For 2020, the Compensation Committee changed the criteria for the PRSUs to four metrics, with no discretionary portion. Revenue and Adjusted EBITDAS are being retained, and two additional metrics, free cash flow as a percentage of revenue and return on average book equity, will replace Operating Income. These two newly-added metrics are relative metrics, the performance of which are based upon how the Company performs relative to a peer group. PRSUs are equity-classified and compensation costs are initially measured using the fair value of the underlying stock at the date of grant, assuming that the target performance conditions will be achieved. Compensation costs related to the PRSUs are subsequently adjusted for changes in the expected outcomes of the performance conditions. Discretionary PRSUs are liability-classified and adjusted to fair value (with a corresponding adjustment to compensation expense) based upon the targeted number of shares to be awarded and the fair value of the underlying stock each reporting period until approved by the Compensation Committee, at which point they are equity-classified. A summary of the Company's PRSU activity is as follows: Six months ended June 30, 2020 2019 Units Weighted Units Weighted Outstanding at beginning of period: 260 $ 16.77 277 $ 17.80 Granted 292 $ 3.68 190 $ 13.63 Performance condition adjustments 1 $ 13.63 (3) $ 18.46 Released (79) $ 15.43 (77) $ 15.86 Forfeited — $ — — $ — Outstanding at end of period: 474 $ 8.17 387 $ 15.94 During the six months ended June 30, 2020 and June 30, 2019, the Compensation Committee approved the final calculation of the award metrics for calendar year 2019 and calendar year 2018, respectively. As a result, the calendar year 2019 PRSUs increased by approximately 1,000 units and the calendar year 2018 PRSUs decreased by approximately 3,000 units. As of June 30, 2020, the final revenue and adjusted EBITDA metrics were not finalized related to the 2020 grant, therefore, approximately 146 thousand shares were liability classified at June 30, 2020. The liability at June 30, 2020 was less than $0.1 million. The revenue and adjusted EBITDA metrics were finalized in August 2020. For the three months ended June 30, 2020 and June 30, 2019, the Company recognized aggregate share-based compensation expense related to the awards described above of approximately $0.3 million and $0.4 million, respectively. For the six months ended June 30, 2020 and June 30, 2019, the Company recognized aggregate share-based compensation expense related to the awards described above of approximately $0.6 million and $0.7 million, respectively. At June 30, 2020, there was $2.0 million of total unrecognized compensation costs related to approximately 474,000 non-vested PRSUs, which is expected to be recognized over a remaining weighted-average period of 2.5 years.

Earnings (loss) per Share

Earnings (loss) per Share	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Earnings (loss) per Share	Earnings (loss) per Share Basic earnings (loss) per share is computed by dividing net income by the weighted-average number of shares outstanding during the period. Diluted earnings per share is computed by dividing net income by the sum of (1) the weighted-average number of shares of common stock outstanding during the period, and (2) the dilutive effect of assumed conversion of equity awards using the treasury stock method. With respect to the number of weighted-average shares outstanding (denominator), diluted shares reflects: (i) the exercise of options to acquire common stock to the extent that the options’ exercise prices are less than the average market price of common shares during the period and (ii) the pro forma vesting of restricted stock units. The following table sets forth the computations of basic and diluted earnings per share: Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Basic earnings (loss) per share: Numerator: Net income (loss) attributable to Mistras Group, Inc. $ (2,656) $ 7,431 $ (101,165) $ 2,138 Denominator: Weighted-average common shares outstanding 29,085 28,657 29,024 28,616 Basic earnings (loss) per share $ (0.09) $ 0.26 $ (3.49) $ 0.07 Diluted earnings (loss) per share: Numerator: Net income (loss) attributable to Mistras Group, Inc. $ (2,656) $ 7,431 $ (101,165) $ 2,138 Denominator: Weighted-average common shares outstanding 29,085 28,657 29,024 28,616 Dilutive effect of stock options outstanding (1) — 46 — 131 Dilutive effect of restricted stock units outstanding (1) — 159 — 171 29,085 28,862 29,024 28,918 Diluted earnings (loss) per share $ (0.09) $ 0.26 $ (3.49) $ 0.07 _______________ (1) For the three and six months ended June 30, 2020, 118 thousand shares and 223 thousand shares related to restricted stock were excluded from the calculation of diluted EPS due to the net loss for the period.

Acquisitions and Dispositions

Acquisitions and Dispositions	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Acquisitions The Company did not complete any acquisitions during the six months ended June 30, 2020 or 2019. During September 2019, the Company completed one acquisition that provides pipeline integrity management software and services to energy transportation companies. The Company acquired all the equity interest of the acquiree in exchange for aggregate consideration of $4.4 million in cash, contingent consideration of up to $4.3 million to be earned based upon the acquired business achieving specific performance metrics over the initial three years of operations from the acquisition date and working capital adjustments. The goodwill recorded is primarily attributable to expected synergies and is generally fully deductible for tax purposes. The Company is still in the process of completing its valuation of the assets acquired and liabilities assumed. The Company accounted for this transaction in accordance with the acquisition method of accounting for business combinations. The following table summarizes the estimated fair value of the assets acquired and liabilities assumed, the Company's allocation of purchase price and any subsequent adjustments made for the September 2019 acquisition: Cash paid $ 4,380 Working capital adjustments (152) Fair value of contingent consideration 1,142 Total consideration $ 5,370 Current net assets $ 142 Other assets 34 Property, plant and equipment 65 Intangibles 3,594 Goodwill 1,535 Net assets acquired $ 5,370 Acquisition-Related Expense In the course of its acquisition activities, the Company incurs costs in connection with due diligence, such as professional fees, and other expenses. Additionally, the Company adjusts the fair value of acquisition-related contingent consideration liabilities on a quarterly basis. These amounts are reported as Acquisition-related expense, net on the Unaudited Condensed Consolidated Statements of Income (Loss) and were as follows for the three and six months ended June 30, 2020 and 2019: Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Due diligence, professional fees and other transaction costs $ — $ 182 $ — $ 330 Adjustments to fair value of contingent consideration liabilities 19 367 (523) 672 Acquisition-related expense, net $ 19 $ 549 $ (523) $ 1,002 The Company's contingent consideration liabilities are included in Accrued expenses and other current liabilities and Other long-term liabilities on the Condensed Consolidated Balance Sheets.

Accounts Receivable, net

Accounts Receivable, net	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Accounts Receivable, net	Accounts Receivable, net Accounts receivable consisted of the following: June 30, 2020 December 31, 2019 Trade accounts receivable $ 111,658 $ 144,282 Allowance for doubtful accounts (7,960) (8,285) Accounts receivable, net $ 103,698 $ 135,997 The Company had $16.6 million and $22.2 million of unbilled revenue accrued as of June 30, 2020 and December 31, 2019, respectively. These amounts are included in the trade accounts receivable balances above. Unbilled revenue is generally billed in the subsequent quarter to their revenue recognition. The Company was contracted to perform inspections of welds on various pipeline projects in Texas for a customer. As of June 30, 2020, approximately $1.4 million of past due receivables were outstanding from this customer. The Company received notice from the customer in December 2019, alleging that the work performed was not in compliance with the contract. The Company filed a lawsuit to recover the $1.4 million and other amounts due to the Company and the customer filed a counterclaim, alleging breach of contract and seeking its damages. Accordingly, the Company recorded a full reserve in the amount of $1.4 million during the second half of 2019 for these past due receivables. The status of the dispute has not changed during 2020. See Note 14– Commitments and Contingencies for additional details. In the fourth quarter of 2018, the Company recorded a reserve of $0.7 million for a renewable energy industry customer, based in part on the available information about the financial difficulties of the customer. During the first quarter of 2019, the Company recorded an additional charge of $5.7 million to fully reserve for the amount of the exposure related to this customer. This customer filed for a voluntary insolvency proceeding on April 9, 2019. During the second quarter of 2019, the Company reversed $1.0 million of this reserve based on additional information obtained during the quarter. The status of the dispute has not changed since the second quarter of 2019. During 2019, the Company sold to an unaffiliated third party, without recourse, its remaining outstanding receivables owed from a customer which filed for bankruptcy, and for which the Company had initially recorded a charge during the second quarter of 2017. During the first quarter of 2019, the Company recorded a recovery of $0.2 million and during the second quarter of 2019, the Company recorded a recovery $1.7 million, related to a bad debt provision for the receivables due from this customer. This matter is considered fully resolved.

Property, Plant and Equipment,

Property, Plant and Equipment, net	6 Months Ended
	Jun. 30, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, net	Property, Plant and Equipment, net Property, plant and equipment consisted of the following: Useful Life (Years) June 30, 2020 December 31, 2019 Land $ 2,669 $ 2,672 Buildings and improvements 30-40 24,543 24,537 Office furniture and equipment 5-8 19,465 17,227 Machinery and equipment 5-7 227,671 225,974 274,348 270,410 Accumulated depreciation and amortization (181,110) (171,803) Property, plant and equipment, net $ 93,238 $ 98,607 Depreciation and amortization expense for the three months ended June 30, 2020 and 2019 was approximately $6.0 million and $6.1 million, respectively.

Goodwill

Goodwill	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill Changes in the carrying amount of goodwill by segment is shown below: Services International Products and Systems Total Balance at December 31, 2019 $ 247,215 $ 35,195 $ — $ 282,410 Goodwill acquired during the period — — — — Impairment charges (57,227) (19,862) — (77,089) Adjustments to preliminary purchase price allocations — — — — Foreign currency translation (5,263) (781) — (6,044) Balance at June 30, 2020 $ 184,725 $ 14,552 $ — $ 199,277 The Company reviews goodwill for impairment on a reporting unit basis on October 1 of each year and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. During the first quarter of 2020, the Company’s market capitalization declined significantly compared to the fourth quarter of 2019. Over the same period, the equity value of the Company’s peer group, and the overall U.S. stock market also declined significantly amid market volatility. In addition, oil prices had dropped significantly. These declines were driven in large part by the uncertainty surrounding the COVID-19 pandemic and other macroeconomic events such as the geopolitical tensions between OPEC and Russia. Based on these factors, the Company concluded that multiple triggering events occurred and, accordingly, an interim quantitative goodwill impairment test was performed as of the testing date for each reporting unit as of March 31, 2020 (“testing date”). During the first quarter of 2020, the Company also performed an analysis to determine any impairment of long-lived assets (see Note 9– Intangible assets ) as well based on the triggering events noted above. In performing the interim quantitative goodwill impairment test and consistent with prior practice, the Company determined the fair value of each of the reporting units using a combination of the income approach and the market approach by assessing each of these valuation methodologies based upon availability and relevance of comparable company data and determining the appropriate weighting. Under the income approach, the fair value for each of the reporting units was determined based on the present value of estimated future cash flows, discounted at an appropriate risk-adjusted rate. The Company used internal forecasts, updated for recent events, to estimate future cash flows with cash flows beyond the specific operating plans estimated using a terminal value calculation, which incorporates historical and forecasted trends, including an estimate of long-term future growth rates, based on the Company’s most recent views of the long-term outlook for each reporting unit. The internal forecasts include assumptions about future market recovery, including the expected demand for the Company’s goods and services. Due to the inherent uncertainties involved in making estimates and assumptions, actual results may differ from those assumed in the forecasts. The Company derived the discount rates using a capital asset pricing model and analyzing published rates for industries relevant to the reporting units to estimate the cost of equity financing. The Company used discount rates that are commensurate with the risks and uncertainties inherent in the respective businesses and in the internally developed forecasts, updated for recent events. The market approach valuations were derived from metrics of publicly traded companies or historically completed transactions of comparable businesses. The selection of comparable businesses was based on the markets in which the reporting units operate considering risk profiles, size, geography, and diversity of products and services. Based upon the results of the interim quantitative goodwill impairment test during the first quarter of 2020, the Company recorded an aggregate impairment charge of $77.1 million, which included $57.2 million in the services reporting unit within the Services segment, and $19.3 million in the European reporting unit and $0.6 million in the Brazilian reporting unit, both within the International segment. The impairment was calculated based on the difference between the estimated fair value and the carrying value of the reporting units and are included in Impairment charges on the Unaudited Condensed Consolidated Statements of Income (Loss) for the six months ended June 30, 2020. Subsequent to March 31, 2020 through June 30, 2020, the Company did not identify any changes in circumstances that would indicate the carrying value of goodwill may not be recoverable. Significant adverse changes in future periods could negatively affect the Company's key assumptions and may result in future goodwill impairment charges which could be material.

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible Assets	Intangible Assets The gross amount, accumulated amortization and net carrying amount of intangible assets were as follows: June 30, 2020 December 31, 2019 Useful Life Gross Amount Accumulated Amortization Impairment Net Carrying Amount Gross Amount Accumulated Amortization Net Carrying Amount Customer relationships 5-18 $ 112,813 $ (70,370) $ (2,206) $ 40,237 $ 113,861 $ (67,853) $ 46,008 Software/Technology 3-15 74,899 (21,365) (25,874) 27,660 77,914 (18,756) 59,158 Covenants not to compete 2-5 12,688 (11,846) (212) 630 12,795 (11,630) 1,165 Other 2-12 10,864 (8,041) (502) 2,321 10,813 (7,607) 3,206 Total $ 211,264 $ (111,622) $ (28,794) $ 70,848 $ 215,383 $ (105,846) $ 109,537 As described in Note 8– Goodwill , during the first quarter of 2020, there were negative market indicators that were determined to be triggering events indicating a potential impairment of certain long-lived assets within asset groups in the Services, International, Products and Corporate segments. The asset groups are groupings of assets and liabilities determined at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities. Recoverability testing indicated that certain intangible assets and right of use assets (See Note 13– Leases ) were potentially impaired. For asset groups that required an impairment measurement, similar to the valuations performed to determine the goodwill impairment, the Company used income and market approaches to estimate the fair value of the long-lived assets, which requires significant judgment in evaluation of the useful lives of the assets, economic and industry trends, estimated future cash flows, discount rates, and other factors. The result of the analysis was an aggregate impairment charge of $28.8 million, which included $25.9 million to software/technology, $2.2 million to customer relationships, $0.5 million to other intangibles and $0.2 million to covenants not to compete, all of which are in the Services reporting unit within the Services segment and are included in Impairment charges on the Unaudited Condensed Consolidated Statements of Income (Loss) for the six months ended June 30, 2020. Amortization expense for the three months ended June 30, 2020 and June 30, 2019 was approximately $2.6 million and $3.5 million, respectively.

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	6 Months Ended
	Jun. 30, 2020
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following: June 30, 2020 December 31, 2019 Accrued salaries, wages and related employee benefits $ 27,014 $ 30,072 Contingent consideration, current portion 1,023 2,614 Accrued workers’ compensation and health benefits 4,434 4,467 Deferred revenue 6,861 5,860 Pension accrual 2,519 2,519 Right-of-use liability - operating 9,857 10,133 Other accrued expenses 25,600 25,724 Total $ 77,308 $ 81,389

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following: June 30, 2020 December 31, 2019 Senior credit facility $ 138,033 $ 151,773 Senior secured term loan, net of debt issuance costs of $0.3 million 92,202 94,919 Other 9,161 8,021 Total debt 239,396 254,713 Less: Current portion (8,735) (6,593) Long-term debt, net of current portion $ 230,661 $ 248,120 Senior Credit Facility The Company has a credit agreement with its banking group ("Credit Agreement") which provides the Company with a revolving line of credit and a $100 million senior secured term loan A facility. Pursuant to the Amendment described below, the revolving line of credit was reduced from $300 million to $175 million. Both the revolving line of credit and the term loan A facility under the Credit Agreement have a maturity date of December 12, 2023. On May 15, 2020, the Company entered into the Third Amendment (the “Amendment”) to the Credit Agreement. The amendment was needed because the Company determined that as a result of the uncertain impact of the COVID-19 pandemic and the significant drop in oil prices, it would not meet the then existing financial covenants in the Credit Agreement for upcoming quarters. Accordingly, the Amendment modified the financial covenants to provide for: i) elimination of the Funded Debt Leverage Ratio (as defined in the Credit Agreement) for the quarters ended June 30 and September 30, 2020 and increased the Funded Debt Leverage ratio to no greater than 5.25 to 1 beginning for the quarter ending December 31, 2020 and decreasing each successive quarter to no greater than 3.50 to 1 for the quarter ended September 30, 2021, and all quarterly periods thereafter; ii) an elimination of the minimum Fixed Charge Coverage Ratio (as defined in the Credit Agreement for the quarters ended June 30, September 30 and December 31, 2020), a decrease to 1.0 to 1 for the quarter ending March 31, 2021 and returning to 1.25 to 1 for the quarter ending June 30, 2021 and thereafter; iii) the addition of a minimum EBITDA covenant requiring $3.44 million for the three months ending June 30, 2020, $24.25 million for the six months ending September 30, 2020, and $38.55 million for the nine months ending December 31, 2020, with no requirement thereafter; and iv) the addition of a minimum Liquidity (as defined in the Amendment) covenant of not less than $20.0 million at all times through September 30, 2020 and ceasing thereafter. In addition, the Amendment set a LIBOR floor of 1.0% applicable to all LIBOR loans, and increased the LIBOR margin range to 1.50% to 4.15%, in addition to certain other modifications of the Credit Agreement. The Amendment also requires that the Company promptly prepay the outstanding amount under the revolving credit facility in an amount equal to the difference between (a) the aggregate sum of cash and cash equivalents of the Company and its subsidiaries held in the United States minus (b) $10.0 million if, for a period of two (2) consecutive business days, (i) the outstanding amount under the revolving credit facility exceeds $75.0 million and (ii) the such cash and cash equivalents exceeds $10.0 million. The Credit Amendment, as amended, provides that the Company may not make any acquisitions prior to June 30, 2021, and thereafter only if the Company's Funded Debt Leverage Ratio is less than 2.50 to 1, and after giving effect to such acquisition, its pro forma Funded Debt Leverage Ratio will not be greater than 3.25 to 1. The Credit Agreement also limits the Company’s ability to, among other things, create liens, make investments, incur more indebtedness, merge or consolidate, make dispositions of property, pay dividends and make distributions to stockholders or repurchase its stock, enter into a new line of business, enter into transactions with affiliates and enter into burdensome agreements. The Company may borrow up to $100 million in non-U.S. Dollar currencies and use up to $20 million of the credit limit for the issuance of letters of credit. As of June 30, 2020, the Company had borrowings of $230.2 million and a total of $3.9 million of letters of credit outstanding under the Credit Agreement. The Company has capitalized costs associated with debt modifications of $1.3 million as of June 30, 2020, which is included in Other assets on the Condensed Consolidated Balance Sheets. The Amendment reduced the Company's total available loan capacity, amongst other things, and as a result, the Company expensed approximately $0.6 million in capitalized debt issuance costs during the second quarter of 2020, which was included in Selling, general and administrative expenses on the Unaudited Condensed Consolidated Statements of Income (Loss). As of June 30, 2020, the Company was in compliance with the terms of the Credit Agreement and will continuously monitor its compliance with the covenants contained in its Credit Agreement. The Company believes that it is probable, based on the amended covenants, that the Company will be able to comply with the financial covenants in the Credit Agreement as modified by the Amendment and that sufficient credit remains available under the Credit Agreement to meet the Company's liquidity needs. However, due to the uncertainties being caused by the COVID-19 pandemic, the significant volatility in oil prices, and volatility in the aerospace production, such matters cannot be predicted with certainty. Other debt The Company's other debt includes local bank financing provided at the local subsidiary level used to support working capital requirements and fund capital expenditures. At June 30, 2020, there was an aggregate of approximately $9.2 million outstanding, payable at various times through 2030. Monthly payments range from $1 thousand to $17 thousand and interest rates range from 0.4% to 3.5%.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company performs fair value measurements in accordance with the guidance provided by ASC 820, Fair Value Measurements and Disclosures. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Financial instruments measured at fair value on a recurring basis The fair value of contingent consideration liabilities was estimated using a discounted cash flow technique with significant inputs that are not observable in the market and thus represents a Level 3 fair value measurement as defined in ASC 820. The significant inputs in the Level 3 measurement not supported by market activity include the probability assessments of expected future cash flows related to the acquisitions, appropriately discounted considering the uncertainties associated with the obligation, and as calculated in accordance with the terms of the applicable acquisition agreements. The following table represents the changes in the fair value of Level 3 contingent consideration: Six months ended June 30, 2020 2019 Beginning balance $ 3,216 $ 2,365 Payments (1,303) — Accretion of liability 30 75 Revaluation (553) 597 Foreign currency translation (34) 58 Ending balance $ 1,356 $ 3,095 Financial instruments not measured at fair value on a recurring basis The Company has evaluated current market conditions and borrower credit quality and has determined that the carrying value of its long-term debt approximates fair value. The fair value of the Company’s notes payable and capital lease obligations approximates their carrying amounts based on anticipated interest rates which management believes would currently be available to the Company for similar issuances of debt.

Leases

Leases	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Leases	Leases The Company leases certain office and operating facilities, machinery, equipment, and vehicles. Concurrent with the adoption of ASC 842, the Company recognized a right-of-use (ROU) asset and lease liability based on the present value of the future lease payments over the lease term for each lease agreement. The Company has elected not to recognize a ROU asset and lease liability for leases with terms of 12 months or less and will continue to recognize lease expense for these leases on a straight-line basis over the lease term. The Company has leases with both lease components and non-lease components, such as common area maintenance, utilities, or other repairs and maintenance. For all asset classes, the Company decided to utilize the practical expedient to include both fixed lease components and fixed non-lease components in calculating the ROU asset and lease liability. The Company identified variable lease payments, such as maintenance payments based on actual activities performed or costs incurred, at lease commencement by assessing the nature of the payment provisions, including whether the payments are subject to a minimum charge. Many of the Company's leases include one or more options to renew. When it is reasonably certain that the Company will exercise the option, the Company will include the impact of the option in the lease term for purposes of determining future lease payments. As the Company is unable to determine the discount rate implicit in its lease agreements, the Company uses its incremental borrowing rate on the commencement date to calculate the present value of future payments. The Company’s Condensed Consolidated Balance Sheets includes the following related to operating leases: Leases Classification June 30, 2020 December 31, 2019 Assets ROU assets Other Assets $ 43,458 $ 45,817 Liabilities ROU - current Accrued and other current liabilities $ 9,857 $ 10,133 ROU liability - long-term Other liabilities 34,843 36,750 Total ROU liabilities $ 44,700 $ 46,883 Included within the balance of operating leases is a lease for the Company’s headquarters which is with a related party. The ROU liability for this facility was approximately $4.2 million and $4.5 million as of June 30, 2020 and December 31, 2019, respectively. Total rent payments for this facility were approximately $0.2 million for each of the three months ended June 30, 2020 and June 30, 2019. Total rent payments for this facility were approximately $0.4 million and $0.5 million for the six months ended June 30, 2020 and June 30, 2019, respectively. As part of the COVID-19 related vendor concessions, an agreement was reached during the second quarter of 2020 with the related party to reduce rental payments by 20% and defer payments for 90 days for the lease of the Company’s headquarters, starting in June 2020 through December 2020. As part of other COVID-19 related vendor discussions, the Company has modified the terms of several North America operating lease contracts to provide temporary reductions in monthly rental payments and/or temporary deferrals of monthly rental payments. Temporary rent reductions and deferred rental payments have been accounted for on a cash basis and is reflected as a reduction of variable lease expense in the chart below. The total ROU assets attributable to finance leases were approximately $17.3 million and $19.2 million as of June 30, 2020 and December 31, 2019, respectively, which is included in Property, plant, and equipment, net on the Condensed Consolidated Balance Sheets. As described in Note 9– Intangible Assets , during the first quarter of 2020 the Company performed an analysis to determine whether there was any impairment of long-lived assets, which included the ROU assets, within the Services, International, and Products and Systems operating segments as well as Corporate. The result of the analysis was a $0.2 million impairment of a ROU asset in an asset group within the Services segment which was included in Impairment charges on the Unaudited Condensed Consolidated Statements of Income (Loss) for the six months ended June 30, 2020. The components of lease costs were as follows: Three months ended June 30, Six months ended June 30, Classification 2020 2019 2020 2019 Finance lease expense Amortization of ROU assets Depreciation and amortization $ 1,133 $ 1,226 $ 2,375 $ 2,403 Interest on lease liabilities Interest expense 216 189 437 380 Operating lease expense Cost of revenue; Selling, general & administrative expenses 3,317 3,139 6,664 6,259 Short-term lease expense Cost of revenue; Selling, general & administrative expenses 1 2 2 6 Variable lease expense Cost of revenue; Selling, general & administrative expenses 114 273 437 518 Total $ 4,781 $ 4,829 $ 9,915 $ 9,566 Additional information related to leases was as follows: Six months ended June 30, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities for finance leases Finance - financing cash flows $ 2,132 $ 2,411 Finance - operating cash flows $ 437 $ 380 Operating - operating cash flows $ 6,562 $ 6,196 ROU assets obtained in the exchange for lease liabilities Finance leases $ 1,266 $ 2,887 Operating leases $ 2,451 $ 8,962 Weighted-average remaining lease term (in years) Finance leases 5.9 5.8 Operating leases 6.0 6.0 Weighted-average discount rate Finance leases 5.9 % 6.3 % Operating leases 5.8 % 6.0 % Maturities of lease liabilities as of June 30, 2020 were as follows: Finance Operating Remainder of 2020 $ 3,280 $ 6,367 2021 4,518 10,933 2022 3,678 8,853 2023 2,806 7,367 2024 1,893 5,755 Thereafter 1,096 14,094 Total 17,271 53,369 Less: Present value discount (1,665) (8,669) Lease liability $ 15,606 $ 44,700
Leases	Leases The Company leases certain office and operating facilities, machinery, equipment, and vehicles. Concurrent with the adoption of ASC 842, the Company recognized a right-of-use (ROU) asset and lease liability based on the present value of the future lease payments over the lease term for each lease agreement. The Company has elected not to recognize a ROU asset and lease liability for leases with terms of 12 months or less and will continue to recognize lease expense for these leases on a straight-line basis over the lease term. The Company has leases with both lease components and non-lease components, such as common area maintenance, utilities, or other repairs and maintenance. For all asset classes, the Company decided to utilize the practical expedient to include both fixed lease components and fixed non-lease components in calculating the ROU asset and lease liability. The Company identified variable lease payments, such as maintenance payments based on actual activities performed or costs incurred, at lease commencement by assessing the nature of the payment provisions, including whether the payments are subject to a minimum charge. Many of the Company's leases include one or more options to renew. When it is reasonably certain that the Company will exercise the option, the Company will include the impact of the option in the lease term for purposes of determining future lease payments. As the Company is unable to determine the discount rate implicit in its lease agreements, the Company uses its incremental borrowing rate on the commencement date to calculate the present value of future payments. The Company’s Condensed Consolidated Balance Sheets includes the following related to operating leases: Leases Classification June 30, 2020 December 31, 2019 Assets ROU assets Other Assets $ 43,458 $ 45,817 Liabilities ROU - current Accrued and other current liabilities $ 9,857 $ 10,133 ROU liability - long-term Other liabilities 34,843 36,750 Total ROU liabilities $ 44,700 $ 46,883 Included within the balance of operating leases is a lease for the Company’s headquarters which is with a related party. The ROU liability for this facility was approximately $4.2 million and $4.5 million as of June 30, 2020 and December 31, 2019, respectively. Total rent payments for this facility were approximately $0.2 million for each of the three months ended June 30, 2020 and June 30, 2019. Total rent payments for this facility were approximately $0.4 million and $0.5 million for the six months ended June 30, 2020 and June 30, 2019, respectively. As part of the COVID-19 related vendor concessions, an agreement was reached during the second quarter of 2020 with the related party to reduce rental payments by 20% and defer payments for 90 days for the lease of the Company’s headquarters, starting in June 2020 through December 2020. As part of other COVID-19 related vendor discussions, the Company has modified the terms of several North America operating lease contracts to provide temporary reductions in monthly rental payments and/or temporary deferrals of monthly rental payments. Temporary rent reductions and deferred rental payments have been accounted for on a cash basis and is reflected as a reduction of variable lease expense in the chart below. The total ROU assets attributable to finance leases were approximately $17.3 million and $19.2 million as of June 30, 2020 and December 31, 2019, respectively, which is included in Property, plant, and equipment, net on the Condensed Consolidated Balance Sheets. As described in Note 9– Intangible Assets , during the first quarter of 2020 the Company performed an analysis to determine whether there was any impairment of long-lived assets, which included the ROU assets, within the Services, International, and Products and Systems operating segments as well as Corporate. The result of the analysis was a $0.2 million impairment of a ROU asset in an asset group within the Services segment which was included in Impairment charges on the Unaudited Condensed Consolidated Statements of Income (Loss) for the six months ended June 30, 2020. The components of lease costs were as follows: Three months ended June 30, Six months ended June 30, Classification 2020 2019 2020 2019 Finance lease expense Amortization of ROU assets Depreciation and amortization $ 1,133 $ 1,226 $ 2,375 $ 2,403 Interest on lease liabilities Interest expense 216 189 437 380 Operating lease expense Cost of revenue; Selling, general & administrative expenses 3,317 3,139 6,664 6,259 Short-term lease expense Cost of revenue; Selling, general & administrative expenses 1 2 2 6 Variable lease expense Cost of revenue; Selling, general & administrative expenses 114 273 437 518 Total $ 4,781 $ 4,829 $ 9,915 $ 9,566 Additional information related to leases was as follows: Six months ended June 30, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities for finance leases Finance - financing cash flows $ 2,132 $ 2,411 Finance - operating cash flows $ 437 $ 380 Operating - operating cash flows $ 6,562 $ 6,196 ROU assets obtained in the exchange for lease liabilities Finance leases $ 1,266 $ 2,887 Operating leases $ 2,451 $ 8,962 Weighted-average remaining lease term (in years) Finance leases 5.9 5.8 Operating leases 6.0 6.0 Weighted-average discount rate Finance leases 5.9 % 6.3 % Operating leases 5.8 % 6.0 % Maturities of lease liabilities as of June 30, 2020 were as follows: Finance Operating Remainder of 2020 $ 3,280 $ 6,367 2021 4,518 10,933 2022 3,678 8,853 2023 2,806 7,367 2024 1,893 5,755 Thereafter 1,096 14,094 Total 17,271 53,369 Less: Present value discount (1,665) (8,669) Lease liability $ 15,606 $ 44,700

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings and Government Investigations The Company is subject to periodic lawsuits, investigations and claims that arise in the ordinary course of business. The Company cannot predict with certainty the ultimate resolution of lawsuits, investigations and claims asserted against it. Except possible liabilities that could arise for certain of the matters described below, the Company does not believe that any currently pending legal proceeding to which the Company is a party will have a material adverse effect on its business, results of operations, cash flows or financial condition. The costs of defense and amounts that may be recovered against the Company may be covered by insurance for certain matters. Litigation and Commercial Claims The Company was contracted to perform inspections of welds on various pipeline projects in Texas for a customer. As of June 30, 2020, approximately $1.4 million of past due receivables were outstanding from this customer. The customer provided the Company with notice in December 2019, alleging that the Company’s inspection of 66 welds (out of over 16,000 welds inspected) were not in compliance with the contract, claimed approximately $7.6 million in damages, and requested that the Company pay these damages and any other damages incurred. The Company has filed a lawsuit in the District Court of Bexar County, Texas, 37th Judicial District, in an action captioned Mistras Group, Inc. v. Epic Y-Grade Pipeline LP, to recover the $1.4 million and other amounts due to the Company. The customer filed a counterclaim, alleging breach of contract and seeking recovery of its alleged damages. The Company believes that any successful claim by the customer regarding the Company’s workmanship will be covered by insurance, subject to payment of a deductible. At this time, the Company is unable to determine whether it has any liability in connection with this matter and if so, the amount or range of any such liability, and accordingly, has not established any accruals for this matter. The Company recorded a full reserve in the amount of $1.4 million during the second half of 2019 for these past due receivables. See Note 6– Accounts Receivable, net . Pension Related Contingencies The workforce of certain of the Company’s subsidiaries are unionized and the terms of employment for these workers are governed by collective bargaining agreements, or CBAs. Under these CBAs, the Company’s subsidiaries are required to contribute to the national pension funds for the unions representing these employees, which are multi-employer pension plans. The Company was notified that a significant project was awarded to another contractor in January 2018, and as a result, one of the Company’s subsidiaries experienced a significant reduction in the number of its employees covered by one of the CBAs. Under certain circumstances, such a reduction in the number of employees participating in multi-employer pension plans pursuant to this CBA could result in a complete or partial withdrawal liability to these multi-employer pension plans under the Employee Retirement Income Security Act of 1974 ("ERISA"). Management explored options to retain a level of union work that would avoid withdrawal liability to the pension plans but concluded during the third quarter of 2018 that the Company's subsidiaries probably would not obtain sufficient union work to avoid withdrawal liability. Therefore, the Company determined that it is probable that its subsidiary would incur a withdrawal liability related to these multi-employer pension plans. Accordingly, the Company recorded a charge of $5.9 million during 2018 and $0.8 million during 2019 for this potential withdrawal liability. The Company’s subsidiary reached an agreement with one of the pension funds in September 2019 and made a final payment of $0.9 million in complete satisfaction of the withdrawal liability of the subsidiary. Excluding the settlement payment, the Company made monthly payments totaling $3.3 million through the time of the final settlement payment, for total payments of $4.2 million. The balance of the estimated total amount of this potential liability as of June 30, 2020 is approximately $2.5 million. Severance and labor disputes The Company’s German subsidiary provides employees to customers under temporary staff leasing arrangements. In April 2017, the German Labor Lease Act was passed in Germany limiting the duration of temporary workers to eighteen months, or longer as subsequently agreed with by a customer appropriate authority. Since the passing of the German Labor Lease Act, the Company explored selling its staff leasing services and concluded during the third quarter of 2018 that a sale would not be probable. As a result, the Company decided that it would not renew several of these leasing services contracts when they expired beginning in 2019. Due to the limit on the length of service allowed under the German Labor Lease Act, employees are being transitioned off the customer contracts. The German subsidiary has terminated, or will terminate, some these employees, creating a severance obligation to the terminated employees, and has transitioned, or will transition other employees to the Company's other customers. During December 2019, the Company executed an agreement to sell the rights of certain customer contracts for total consideration of approximately $0.1 million, effective January 1, 2020. No other assets or liabilities other than those employee benefits related to employees working on the customer contracts were included in the sale. As of June 30, 2020, the Company has approximately $0.4 million of accrued estimated severance payment obligations, which takes into account the Company's estimate with respect to the employees that have been or will be transitioned to the German subsidiaries' other customers. The $0.4 million of estimated obligations is net of $0.3 million in payments made and $0.8 million in reversals due to employees being transitioned to customer contracts. Acquisition and disposition related contingencies The Company is liable for contingent consideration in connection with certain of its acquisitions. As of June 30, 2020, total potential acquisition-related contingent consideration ranged from zero to approximately $5.7 million and would be payable upon the achievement of specific performance metrics by certain of the acquired companies over the next 2.2 years. During 2018, the Company sold a subsidiary in the Products and Systems segment. As part of the sale, the Company entered into a three-year agreement to purchase products from the buyer, with a cumulative commitment of $2.3 million, of which $1.3 million is remaining as of June 30, 2020. The agreement is based on third-party pricing and the Company's planned purchase requirements over the three-year purchase period to meet the minimum contractual purchases.

Segment Disclosure

Segment Disclosure	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Segment Disclosure	Segment Disclosure The Company’s three operating segments are: • Services. This segment provides asset protection solutions predominantly in North America, with the largest concentration in the United States, followed by Canada, consisting primarily of NDT, inspection, mechanical and engineering services that are used to evaluate the safety, structural integrity and reliability of critical energy, industrial and public infrastructure and commercial aerospace components. PCMS software and pipeline related software and data analysis solutions are included in this segment. • International. This segment offers services, products and systems similar to those of the other segments to select markets within Europe, the Middle East, Africa, Asia and South America, but not to customers in China and South Korea, which are served by the Products and Systems segment. • Products and Systems. This segment designs, manufactures, sells, installs and services the Company’s asset protection products and systems, including equipment and instrumentation, predominantly in the United States. Costs incurred for general corporate services, including finance, legal, and certain other costs that are provided to the segments are reported within Corporate and eliminations. Sales to the International segment from the Products and Systems segment and subsequent sales by the International segment of the same items are recorded and reflected in the operating performance of both segments. Additionally, engineering charges and royalty fees charged to the Services and International segments by the Products and Systems segment are reflected in the operating performance of each segment. All such intersegment transactions are eliminated in the Company’s consolidated financial reporting. Selected consolidated financial information by segment for the periods shown was as follows: (with intercompany transactions eliminated in Corporate and eliminations) Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Revenue Services $ 100,677 $ 161,210 $ 229,550 $ 301,507 International 21,343 37,090 50,410 72,252 Products and Systems 4,002 4,269 6,814 7,701 Corporate and eliminations (1,587) (1,953) (2,874) (4,057) $ 124,435 $ 200,616 $ 283,900 $ 377,403 Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Gross profit Services $ 33,940 $ 47,208 $ 66,177 $ 84,573 International 5,392 11,058 13,415 21,418 Products and Systems 1,838 1,825 2,206 3,064 Corporate and eliminations (12) (20) 4 (110) $ 41,158 $ 60,071 $ 81,802 $ 108,945 Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Income (loss) from operations Services $ 10,837 $ 20,905 $ (70,657) $ 24,958 International (1,937) 2,450 (22,356) 2,234 Products and Systems (96) (405) (1,776) (1,733) Corporate and eliminations (9,187) (7,531) (16,822) (14,436) $ (383) $ 15,419 $ (111,611) $ 11,023 Income (loss) from operations by operating segment includes intercompany transactions, which are eliminated in Corporate and eliminations. Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Depreciation and amortization Services $ 6,211 $ 7,209 $ 13,286 $ 14,478 International 2,077 2,042 4,217 4,131 Products and Systems 255 300 508 589 Corporate and eliminations (13) 50 (14) 71 $ 8,530 $ 9,601 $ 17,997 $ 19,269 June 30, 2020 December 31, 2019 Intangible assets, net Services $ 60,713 $ 98,284 International 8,859 9,814 Products and Systems 1,095 1,181 Corporate and eliminations 181 258 $ 70,848 $ 109,537 June 30, 2020 December 31, 2019 Total assets Services $ 409,745 $ 537,518 International 124,519 153,380 Products and Systems 15,426 16,028 Corporate and eliminations 17,988 12,952 $ 567,678 $ 719,878 Refer to Note 2 –Revenue, for revenue by geographic area for the three and six months ended June 30, 2020 and June 30, 2019.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsJoint VentureOn July 3, 2020, a Canadian subsidiary of the Company entered into a joint venture with the Mikisew First Nation through a limited partnership named Mikisew-Mistras Limited Partnership. The Canadian subsidiary is a limited partner with a 49% interest in Mikisew-Mistras Limited Partnership (the limited partnership), and a 49% shareholder in the corporate general partner of the limited partnership. Mikisew holds the other 51% interest in the limited partnership and the corporate general partner. The limited partnership’s purpose is to provide nondestructive testing, inspection and related services to producers and extractors of oil and gas in the Greater Wood Buffalo region of Alberta, Canada. The limited partnership will subcontract with the Company to provide the nondestructive testing, inspection and related services for the customers of the limited partnership. The Company will also be providing certain administrative support services for the limited partnership, such as billing and collecting. None of the Company’s existing contracts will be transferred to the limited partnership, but any new NDT and inspection services in the Greater Wood Buffalo region the Company seeks to perform would be done through the limited partnership.

Description of Business_and B_2

Description of Business and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The Unaudited Condensed Consolidated Financial Statements contained in this report have been prepared in conformity with U.S. generally accepted accounting principles ("GAAP"). In the opinion of management, the Unaudited Condensed Consolidated Financial Statements include all adjustments, which are of a normal recurring nature, necessary for a fair presentation of the results for the interim periods of the years ending December 31, 2020 and December 31, 2019. Certain items included in these statements are based on management’s estimates. Actual results may differ from those estimates. The results of operations for any interim period are not necessarily indicative of the results expected for the year. The accompanying Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the notes to the Audited Consolidated Financial Statements contained in the Company's 2019 Annual Report on Form 10-K ("2019 Annual Report").
Principles of Consolidation	Principles of Consolidation The accompanying Unaudited Condensed Consolidated Financial Statements include the accounts of Mistras Group, Inc. and its wholly and majority-owned subsidiaries. For subsidiaries in which the Company’s ownership interest is less than 100%, the non-controlling interests are reported in stockholders’ equity in the accompanying Condensed Consolidated Balance Sheets. The non-controlling interests in net results, net of tax, is classified separately in the accompanying Unaudited Condensed Consolidated Statements of Income (Loss). All significant intercompany accounts and transactions have been eliminated in consolidation.
Reclassification	Reclassification Certain amounts in prior periods have been reclassified to conform to the current year presentation. Such reclassifications did not have a material effect on the Company's financial condition or results of operations as previously reported.
Income Taxes	Income Taxes Income taxes are accounted for under the asset and liability method. Deferred income tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and tax credit carry-forwards. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred income tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided if it is more likely than not that some or all of a deferred income tax asset will not be realized. Financial accounting standards prescribe a minimum recognition threshold a tax position is required to meet before being recognized in the financial statements. These standards also provide guidance on de-recognition, measurement, and classification of amounts relating to uncertain tax positions, accounting for and disclosure of interest and penalties, accounting in interim periods and disclosures required. Interest and penalties related to unrecognized tax positions are recognized as incurred within “provision for income taxes” in the consolidated statements of income. ASC 740-270, Income Taxes-Interim Reporting, requires the Company to use an estimated annual effective tax rate (EAETR) for calculating its tax provision for interim periods. At each interim period, the Company is required, with certain exceptions and limitations, to estimate its forecasted worldwide EAETR, which is applied to the Company's year-to-date consolidated ordinary income or loss resulting in the year-to-date income tax provision before considering items not included in ordinary income or loss. The tax effects of events or transactions not considered to represent ordinary income or loss are accounted for discretely in the interim period and are not included in the determination of the EAETR. In response to the COVID-19 pandemic, the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”) was signed into law on March 27, 2020. The CARES Act, among other things, includes tax provisions relating to deferment of employer’s social security payments, net operating loss utilization and carryback periods, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property (QIP). The ultimate impact of the CARES Act may differ from the estimated impact the Company recorded during this interim period due to changes in interpretations and guidance that may be issued and actions the Company may take in response to the CARES Act. The Company will continue to assess the impact that various provisions of the CARES Act, and how they are interpreted and effected, will have on its business. The Company continues to evaluate its deferred tax assets each period to determine if a valuation allowance is required based on whether it is more likely than not that some portion of these deferred tax assets will not be realized. As of June 30, 2020, management concluded that it is more likely than not that a substantial portion of the Company's deferred tax assets will be realized. As part of the Company's analysis, it considered both positive and negative factors that impact profitability and whether those factors would lead to a change in the estimate of the Company's deferred tax assets that may be realized in the future. In the current period, the impact of the COVID-19 pandemic on the Company's business was more pronounced given the pandemic spanned the full quarter. The Company will continue to monitor the impacts of the COVID-19 pandemic on its business, and any sustained or prolonged reductions in future earnings periods may change the Company's conclusions on whether it is more likely than not to realize portions of the Company's deferred tax assets.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). ASU 2019-12 simplifies the accounting for income taxes by eliminating certain exceptions related to the approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period, and the recognition of deferred tax liabilities related to outside basis differences. The standard is effective for interim and annual periods beginning January 1, 2021, with certain amendments applied prospectively and others requiring retrospective application. Early adoption is permitted, with any adjustments reflected as of the beginning of the fiscal year of adoption. If early adoption is elected, all changes as a result of the standard must be adopted in the same period. The Company is currently evaluating the impact of this guidance on its consolidated financial position, results of operations, and cash flows. In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The guidance provides optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another rate that is expected to be discontinued. The amendments in ASU 2020-04 are effective for all entities as of March 12, 2020 through December 31, 2022. The Company is currently evaluating the impact of this guidance on its consolidated financial position, results of operations, and cash flows.
Revenue	Revenue The Company derives the majority of its revenue by providing services on a time and material basis, which are generally short-term in nature. The Company accounts for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers . 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 ASC Topic 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of the Company's contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and is, therefore, not distinct. The Company provides highly integrated and bundled inspection services to its customers. Some of the Company's contracts have multiple performance obligations, most commonly due to the contract providing both goods and services. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation using its best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate standalone selling price is a relative selling price based on price lists. Contract modifications are not routine in the performance of the Company contracts. Generally, when contracts are modified, the modification is to account for changes in scope to the goods and services that are provided. In most instances, contract modifications are for goods or services that are distinct, and, therefore, are accounted for as a separate contract. The Company's performance obligations are satisfied over time as work progresses or at a point in time. The majority of the Company's revenue recognized over time as work progresses is related to its service deliverables, which includes providing testing, inspection and mechanical services to the Company's customers. Revenue is recognized over time based on time and material incurred to date which best portrays the transfer of control to the customer. The Company also utilizes an available practical expedient that provides for revenue to be recognized in an amount that corresponds directly with the value to the customer of the entity’s performance completed to date. Fixed fee arrangements are determined based on expected labor, material, and overhead to be consumed on fulfillment of such services. Revenue is recognized on a cost-to-cost method tracked on an input basis. The majority of the Company's revenue recognized at a point in time is related to product sales when the customer obtains control of the asset, which is generally upon shipment to the customer. Contract costs include labor, material and overhead. The Company expects any significant remaining performance obligations to be satisfied within one year. Contract Estimates The majority of the Company's revenue are short-term in nature. The Company has many master service agreements (MSAs) that specify an overall framework and contract terms when the Company and customers agree upon services or products to be provided. The actual contracting to provide services or furnish products is triggered by a work order, purchase order, or some similar document issued pursuant to a MSA which sets forth the scope of services and/or identifies the products to be provided. From time-to-time, the Company may enter into long-term contracts, which can range from several months to several years. Revenue on such long-term contracts is recognized as work is performed based on total costs incurred to date in relation to the total estimated costs for the performance of the contract at completion. This includes contract estimates of costs to be incurred for the performance of the contract. Cost estimation is based upon the professional knowledge and experience of the Company's project managers, engineers and financial professionals. Factors that are considered in estimating the work to be completed include the availability of materials, the effect of any delays in the Company's project performance and the recoverability of any claims. Whenever revisions of estimates, contract costs and/or contract values indicate that the contract costs will exceed estimated revenue, thus creating a loss, a provision for the total estimated loss is recorded in that period. Contract Balances The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) on the Condensed Consolidated Balance Sheets. Amounts are generally billed as work progresses in accordance with agreed-upon contractual terms, generally at periodic intervals (e.g., weekly, bi-weekly or monthly). Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. However, the Company sometimes receives advances or deposits from its customers before revenue is recognized, resulting in contract liabilities. These assets and liabilities are aggregated on an individual contract basis and reported on the Condensed Consolidated Balance Sheets at the end of each reporting period within accounts receivables or accrued expenses and other current liabilities.
Fair Value Measurements	Fair Value Measurements The Company performs fair value measurements in accordance with the guidance provided by ASC 820, Fair Value Measurements and Disclosures. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Financial instruments measured at fair value on a recurring basis The fair value of contingent consideration liabilities was estimated using a discounted cash flow technique with significant inputs that are not observable in the market and thus represents a Level 3 fair value measurement as defined in ASC 820. The significant inputs in the Level 3 measurement not supported by market activity include the probability assessments of expected future cash flows related to the acquisitions, appropriately discounted considering the uncertainties associated with the obligation, and as calculated in accordance with the terms of the applicable acquisition agreements. Financial instruments not measured at fair value on a recurring basis The Company has evaluated current market conditions and borrower credit quality and has determined that the carrying value of its long-term debt approximates fair value. The fair value of the Company’s notes payable and capital lease obligations approximates their carrying amounts based on anticipated interest rates which management believes would currently be available to the Company for similar issuances of debt.
Leases	LeasesThe Company leases certain office and operating facilities, machinery, equipment, and vehicles. Concurrent with the adoption of ASC 842, the Company recognized a right-of-use (ROU) asset and lease liability based on the present value of the future lease payments over the lease term for each lease agreement. The Company has elected not to recognize a ROU asset and lease liability for leases with terms of 12 months or less and will continue to recognize lease expense for these leases on a straight-line basis over the lease term. The Company has leases with both lease components and non-lease components, such as common area maintenance, utilities, or other repairs and maintenance. For all asset classes, the Company decided to utilize the practical expedient to include both fixed lease components and fixed non-lease components in calculating the ROU asset and lease liability. The Company identified variable lease payments, such as maintenance payments based on actual activities performed or costs incurred, at lease commencement by assessing the nature of the payment provisions, including whether the payments are subject to a minimum charge. Many of the Company's leases include one or more options to renew. When it is reasonably certain that the Company will exercise the option, the Company will include the impact of the option in the lease term for purposes of determining future lease payments. As the Company is unable to determine the discount rate implicit in its lease agreements, the Company uses its incremental borrowing rate on the commencement date to calculate the present value of future payments.

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregated Revenues by Industry and Key Geographic Location	The following series of tables present the Company's disaggregated revenue: Revenue by industry was as follows: Three Months Ended June 30, 2020 Services International Products Corp/Elim Total Oil & Gas $ 59,279 $ 7,339 $ 68 $ — $ 66,686 Aerospace & Defense 14,248 3,595 151 — 17,994 Industrials 10,298 3,817 419 — 14,534 Power generation & Transmission 7,652 1,207 644 — 9,503 Other Process Industries 4,999 2,610 74 — 7,683 Infrastructure, Research & Engineering 2,994 2,020 1,900 — 6,914 Other 1,207 755 746 (1,587) 1,121 Total $ 100,677 $ 21,343 $ 4,002 $ (1,587) $ 124,435 Three Months Ended June 30, 2019 Services International Products Corp/Elim Total Oil & Gas $ 109,103 $ 11,767 $ 465 $ — $ 121,335 Aerospace & Defense 13,511 10,504 315 — 24,330 Industrials 19,638 5,459 647 — 25,744 Power generation & Transmission 8,352 2,499 619 — 11,470 Other Process Industries 6,384 2,504 68 — 8,956 Infrastructure, Research & Engineering 2,806 2,517 1,059 — 6,382 Other 1,416 1,840 1,096 (1,953) 2,399 Total $ 161,210 $ 37,090 $ 4,269 $ (1,953) $ 200,616 Six Months Ended June 30, 2020 Services International Products Corp/Elim Total Oil & Gas $ 142,578 $ 16,443 $ 163 $ — $ 159,184 Aerospace & Defense 28,900 11,010 298 — 40,208 Industrials 23,165 8,736 907 — 32,808 Power generation & Transmission 12,747 2,904 1,498 — 17,149 Other Process Industries 11,003 4,730 77 — 15,810 Infrastructure, Research & Engineering 7,511 4,481 2,460 — 14,452 Other 3,646 2,106 1,411 (2,874) 4,289 Total $ 229,550 $ 50,410 $ 6,814 $ (2,874) $ 283,900 Six Months Ended June 30, 2019 Services International Products Corp/Elim Total Oil & Gas $ 200,769 $ 21,472 $ 480 $ — $ 222,721 Aerospace & Defense 26,305 22,158 622 — 49,085 Industrials 35,762 10,534 1,079 — 47,375 Power generation & Transmission 14,614 3,921 2,000 — 20,535 Other Process Industries 12,702 4,746 73 — 17,521 Infrastructure, Research & Engineering 5,396 5,250 1,905 — 12,551 Other 5,959 4,171 1,542 (4,057) 7,615 Total $ 301,507 $ 72,252 $ 7,701 $ (4,057) $ 377,403 Revenue per key geographic location was as follows: Three Months Ended June 30, 2020 Services International Products Corp/Elim Total United States $ 88,205 $ 160 $ 2,053 $ (810) $ 89,608 Other Americas 12,046 959 72 (93) 12,984 Europe 263 20,031 588 (662) 20,220 Asia-Pacific 163 193 1,289 (22) 1,623 Total $ 100,677 $ 21,343 $ 4,002 $ (1,587) $ 124,435 Three Months Ended June 30, 2019 Services International Products Corp/Elim Total United States $ 131,880 $ 57 $ 2,977 $ (1,274) $ 133,640 Other Americas 28,804 1,686 71 (207) 30,354 Europe 271 33,740 436 (472) 33,975 Asia-Pacific 255 1,607 785 — 2,647 Total $ 161,210 $ 37,090 $ 4,269 $ (1,953) $ 200,616 Six Months Ended June 30, 2020 Services International Products Corp/Elim Total United States $ 197,786 $ 314 $ 3,612 $ (1,521) $ 200,191 Other Americas 30,781 2,464 350 (246) 33,349 Europe 371 46,266 928 (1,041) 46,524 Asia-Pacific 612 1,366 1,924 (66) 3,836 Total $ 229,550 $ 50,410 $ 6,814 $ (2,874) $ 283,900 Six Months Ended June 30, 2019 Services International Products Corp/Elim Total United States $ 245,015 $ 334 $ 4,947 $ (2,554) $ 247,742 Other Americas 55,513 3,915 137 (264) 59,301 Europe 698 65,280 857 (1,235) 65,600 Asia-Pacific 281 2,723 1,760 (4) 4,760 Total $ 301,507 $ 72,252 $ 7,701 $ (4,057) $ 377,403

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Stock Option Activity	The following table sets forth a summary of the stock option activity, weighted-average exercise prices and options outstanding as of June 30, 2020 and June 30, 2019: Six months ended June 30, 2020 2019 Common Stock Options Weighted Average Exercise Price Common Stock Options Weighted Average Exercise Price Outstanding at beginning of period: 5 $ 22.35 2,105 $ 13.47 Granted — $ — — $ — Exercised — $ — (4) $ 10.00 Expired or forfeited — $ — (7) $ 10.00 Outstanding at end of period: 5 $ 22.35 2,094 $ 13.48
Schedule of Vesting Activity of Restricted Stock Unit Awards	A summary of the vesting activity of restricted stock unit awards, with the respective fair value of the awards, is as follows: Six months ended June 30, 2020 2019 Restricted stock awards vested 143 77 Fair value of awards vested $ 542 $ 1,052
Schedule of Fully-vested Common Stock Issued to Non-employee Directors	A summary of the fully-vested common stock the Company issued to its six non-employee directors, in connection with its non-employee director compensation plan, is as follows: Six months ended June 30, 2020 2019 Awards issued 15 15 Grant date fair value of awards issued $ 57 $ 210
Schedule of Company's Outstanding, Nonvested Restricted Share Units and Performance Restricted Stock Units	A summary of the Company's outstanding, non-vested restricted share units is as follows: Six months ended June 30, 2020 2019 Units Weighted Units Weighted Outstanding at beginning of period: 559 $ 16.92 443 $ 20.55 Granted 557 $ 3.77 334 $ 14.04 Released (143) $ 16.74 (77) $ 19.88 Forfeited (14) $ 13.74 (23) $ 19.35 Outstanding at end of period: 959 $ 9.35 677 $ 17.46 A summary of the Company's PRSU activity is as follows: Six months ended June 30, 2020 2019 Units Weighted Units Weighted Outstanding at beginning of period: 260 $ 16.77 277 $ 17.80 Granted 292 $ 3.68 190 $ 13.63 Performance condition adjustments 1 $ 13.63 (3) $ 18.46 Released (79) $ 15.43 (77) $ 15.86 Forfeited — $ — — $ — Outstanding at end of period: 474 $ 8.17 387 $ 15.94

Earnings (loss) per Share (Tabl

Earnings (loss) per Share (Tables)	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Schedule of Computations of Basic and Diluted Earnings per Share	The following table sets forth the computations of basic and diluted earnings per share: Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Basic earnings (loss) per share: Numerator: Net income (loss) attributable to Mistras Group, Inc. $ (2,656) $ 7,431 $ (101,165) $ 2,138 Denominator: Weighted-average common shares outstanding 29,085 28,657 29,024 28,616 Basic earnings (loss) per share $ (0.09) $ 0.26 $ (3.49) $ 0.07 Diluted earnings (loss) per share: Numerator: Net income (loss) attributable to Mistras Group, Inc. $ (2,656) $ 7,431 $ (101,165) $ 2,138 Denominator: Weighted-average common shares outstanding 29,085 28,657 29,024 28,616 Dilutive effect of stock options outstanding (1) — 46 — 131 Dilutive effect of restricted stock units outstanding (1) — 159 — 171 29,085 28,862 29,024 28,918 Diluted earnings (loss) per share $ (0.09) $ 0.26 $ (3.49) $ 0.07 _______________ (1) For the three and six months ended June 30, 2020, 118 thousand shares and 223 thousand shares related to restricted stock were excluded from the calculation of diluted EPS due to the net loss for the period.

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables)	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed	The following table summarizes the estimated fair value of the assets acquired and liabilities assumed, the Company's allocation of purchase price and any subsequent adjustments made for the September 2019 acquisition: Cash paid $ 4,380 Working capital adjustments (152) Fair value of contingent consideration 1,142 Total consideration $ 5,370 Current net assets $ 142 Other assets 34 Property, plant and equipment 65 Intangibles 3,594 Goodwill 1,535 Net assets acquired $ 5,370
Schedule of Acquisition-related Expenses	These amounts are reported as Acquisition-related expense, net on the Unaudited Condensed Consolidated Statements of Income (Loss) and were as follows for the three and six months ended June 30, 2020 and 2019: Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Due diligence, professional fees and other transaction costs $ — $ 182 $ — $ 330 Adjustments to fair value of contingent consideration liabilities 19 367 (523) 672 Acquisition-related expense, net $ 19 $ 549 $ (523) $ 1,002

Accounts Receivable, net (Table

Accounts Receivable, net (Tables)	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Schedule of Accounts Receivable, Net	Accounts receivable consisted of the following: June 30, 2020 December 31, 2019 Trade accounts receivable $ 111,658 $ 144,282 Allowance for doubtful accounts (7,960) (8,285) Accounts receivable, net $ 103,698 $ 135,997

Property, Plant and Equipment_2

Property, Plant and Equipment, net (Tables)	6 Months Ended
	Jun. 30, 2020
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment, Net	Property, plant and equipment consisted of the following: Useful Life (Years) June 30, 2020 December 31, 2019 Land $ 2,669 $ 2,672 Buildings and improvements 30-40 24,543 24,537 Office furniture and equipment 5-8 19,465 17,227 Machinery and equipment 5-7 227,671 225,974 274,348 270,410 Accumulated depreciation and amortization (181,110) (171,803) Property, plant and equipment, net $ 93,238 $ 98,607

Goodwill (Tables)

Goodwill (Tables)	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill	Changes in the carrying amount of goodwill by segment is shown below: Services International Products and Systems Total Balance at December 31, 2019 $ 247,215 $ 35,195 $ — $ 282,410 Goodwill acquired during the period — — — — Impairment charges (57,227) (19,862) — (77,089) Adjustments to preliminary purchase price allocations — — — — Foreign currency translation (5,263) (781) — (6,044) Balance at June 30, 2020 $ 184,725 $ 14,552 $ — $ 199,277

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Schedule of Net Carrying Amount of Intangible Assets	The gross amount, accumulated amortization and net carrying amount of intangible assets were as follows: June 30, 2020 December 31, 2019 Useful Life Gross Amount Accumulated Amortization Impairment Net Carrying Amount Gross Amount Accumulated Amortization Net Carrying Amount Customer relationships 5-18 $ 112,813 $ (70,370) $ (2,206) $ 40,237 $ 113,861 $ (67,853) $ 46,008 Software/Technology 3-15 74,899 (21,365) (25,874) 27,660 77,914 (18,756) 59,158 Covenants not to compete 2-5 12,688 (11,846) (212) 630 12,795 (11,630) 1,165 Other 2-12 10,864 (8,041) (502) 2,321 10,813 (7,607) 3,206 Total $ 211,264 $ (111,622) $ (28,794) $ 70,848 $ 215,383 $ (105,846) $ 109,537

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	6 Months Ended
	Jun. 30, 2020
Payables and Accruals [Abstract]
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following: June 30, 2020 December 31, 2019 Accrued salaries, wages and related employee benefits $ 27,014 $ 30,072 Contingent consideration, current portion 1,023 2,614 Accrued workers’ compensation and health benefits 4,434 4,467 Deferred revenue 6,861 5,860 Pension accrual 2,519 2,519 Right-of-use liability - operating 9,857 10,133 Other accrued expenses 25,600 25,724 Total $ 77,308 $ 81,389

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following: June 30, 2020 December 31, 2019 Senior credit facility $ 138,033 $ 151,773 Senior secured term loan, net of debt issuance costs of $0.3 million 92,202 94,919 Other 9,161 8,021 Total debt 239,396 254,713 Less: Current portion (8,735) (6,593) Long-term debt, net of current portion $ 230,661 $ 248,120

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Schedule of Changes in Fair Value of Level 3 Contingent Consideration	The following table represents the changes in the fair value of Level 3 contingent consideration: Six months ended June 30, 2020 2019 Beginning balance $ 3,216 $ 2,365 Payments (1,303) — Accretion of liability 30 75 Revaluation (553) 597 Foreign currency translation (34) 58 Ending balance $ 1,356 $ 3,095

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Schedule of Supplemental Balance Sheet Information	The Company’s Condensed Consolidated Balance Sheets includes the following related to operating leases: Leases Classification June 30, 2020 December 31, 2019 Assets ROU assets Other Assets $ 43,458 $ 45,817 Liabilities ROU - current Accrued and other current liabilities $ 9,857 $ 10,133 ROU liability - long-term Other liabilities 34,843 36,750 Total ROU liabilities $ 44,700 $ 46,883
Schedule of Components of Lease Costs and Other Information Related to Leases	The components of lease costs were as follows: Three months ended June 30, Six months ended June 30, Classification 2020 2019 2020 2019 Finance lease expense Amortization of ROU assets Depreciation and amortization $ 1,133 $ 1,226 $ 2,375 $ 2,403 Interest on lease liabilities Interest expense 216 189 437 380 Operating lease expense Cost of revenue; Selling, general & administrative expenses 3,317 3,139 6,664 6,259 Short-term lease expense Cost of revenue; Selling, general & administrative expenses 1 2 2 6 Variable lease expense Cost of revenue; Selling, general & administrative expenses 114 273 437 518 Total $ 4,781 $ 4,829 $ 9,915 $ 9,566 Additional information related to leases was as follows: Six months ended June 30, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities for finance leases Finance - financing cash flows $ 2,132 $ 2,411 Finance - operating cash flows $ 437 $ 380 Operating - operating cash flows $ 6,562 $ 6,196 ROU assets obtained in the exchange for lease liabilities Finance leases $ 1,266 $ 2,887 Operating leases $ 2,451 $ 8,962 Weighted-average remaining lease term (in years) Finance leases 5.9 5.8 Operating leases 6.0 6.0 Weighted-average discount rate Finance leases 5.9 % 6.3 % Operating leases 5.8 % 6.0 %
Schedule of Maturities of Operating Lease Liabilities	Maturities of lease liabilities as of June 30, 2020 were as follows: Finance Operating Remainder of 2020 $ 3,280 $ 6,367 2021 4,518 10,933 2022 3,678 8,853 2023 2,806 7,367 2024 1,893 5,755 Thereafter 1,096 14,094 Total 17,271 53,369 Less: Present value discount (1,665) (8,669) Lease liability $ 15,606 $ 44,700
Schedule of Maturities of Finance Lease Liabilities	Maturities of lease liabilities as of June 30, 2020 were as follows: Finance Operating Remainder of 2020 $ 3,280 $ 6,367 2021 4,518 10,933 2022 3,678 8,853 2023 2,806 7,367 2024 1,893 5,755 Thereafter 1,096 14,094 Total 17,271 53,369 Less: Present value discount (1,665) (8,669) Lease liability $ 15,606 $ 44,700

Segment Disclosure (Tables)

Segment Disclosure (Tables)	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Schedule of Consolidated Financial Information by Segment	Selected consolidated financial information by segment for the periods shown was as follows: (with intercompany transactions eliminated in Corporate and eliminations) Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Revenue Services $ 100,677 $ 161,210 $ 229,550 $ 301,507 International 21,343 37,090 50,410 72,252 Products and Systems 4,002 4,269 6,814 7,701 Corporate and eliminations (1,587) (1,953) (2,874) (4,057) $ 124,435 $ 200,616 $ 283,900 $ 377,403 Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Gross profit Services $ 33,940 $ 47,208 $ 66,177 $ 84,573 International 5,392 11,058 13,415 21,418 Products and Systems 1,838 1,825 2,206 3,064 Corporate and eliminations (12) (20) 4 (110) $ 41,158 $ 60,071 $ 81,802 $ 108,945 Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Income (loss) from operations Services $ 10,837 $ 20,905 $ (70,657) $ 24,958 International (1,937) 2,450 (22,356) 2,234 Products and Systems (96) (405) (1,776) (1,733) Corporate and eliminations (9,187) (7,531) (16,822) (14,436) $ (383) $ 15,419 $ (111,611) $ 11,023 Income (loss) from operations by operating segment includes intercompany transactions, which are eliminated in Corporate and eliminations. Three months ended June 30, Six months ended June 30, 2020 2019 2020 2019 Depreciation and amortization Services $ 6,211 $ 7,209 $ 13,286 $ 14,478 International 2,077 2,042 4,217 4,131 Products and Systems 255 300 508 589 Corporate and eliminations (13) 50 (14) 71 $ 8,530 $ 9,601 $ 17,997 $ 19,269 June 30, 2020 December 31, 2019 Intangible assets, net Services $ 60,713 $ 98,284 International 8,859 9,814 Products and Systems 1,095 1,181 Corporate and eliminations 181 258 $ 70,848 $ 109,537 June 30, 2020 December 31, 2019 Total assets Services $ 409,745 $ 537,518 International 124,519 153,380 Products and Systems 15,426 16,028 Corporate and eliminations 17,988 12,952 $ 567,678 $ 719,878

Description of Business_and B_3

Description of Business and Basis of Presentation (Details)	3 Months Ended				6 Months Ended
	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Jun. 30, 2019	Jun. 30, 2020USD ($)	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Goodwill impairment charge					$ 77,089,000
Effective income tax rate		21.00%		37.00%	14.00%	45.00%
COVID-19
Restructuring Cost and Reserve [Line Items]
Goodwill impairment charge			$ 77,100,000
Impairment of intangibles			28,800,000
Impairment of ROU assets			$ 200,000
COVID-19 | Cost Reduction and Efficiency Program
Restructuring Cost and Reserve [Line Items]
Quarterly payment reduction to non-employee directors		$ 3,750,000
COVID-19 | Cost Reduction and Efficiency Program | Subsequent Event | Forecast
Restructuring Cost and Reserve [Line Items]
Quarterly payment reduction to non-employee directors	$ 3,750,000
COVID-19 | Cost Reduction and Efficiency Program | Minimum
Restructuring Cost and Reserve [Line Items]
Salary reduction percentage		0.25
COVID-19 | Cost Reduction and Efficiency Program | Maximum
Restructuring Cost and Reserve [Line Items]
Salary reduction percentage		0.45

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue recognized that was included in contract liability balance at the beginning of the year	$ 3.2	$ 2.7
Revenue, practical expedient, incremental cost of obtaining a contract, maximum period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period	1 year

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 124,435	$ 200,616	$ 283,900	$ 377,403
United States
Disaggregation of Revenue [Line Items]
Revenue	89,608	133,640	200,191	247,742
Other Americas
Disaggregation of Revenue [Line Items]
Revenue	12,984	30,354	33,349	59,301
Europe
Disaggregation of Revenue [Line Items]
Revenue	20,220	33,975	46,524	65,600
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	1,623	2,647	3,836	4,760
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	66,686	121,335	159,184	222,721
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	17,994	24,330	40,208	49,085
Industrials
Disaggregation of Revenue [Line Items]
Revenue	14,534	25,744	32,808	47,375
Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	9,503	11,470	17,149	20,535
Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	7,683	8,956	15,810	17,521
Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	6,914	6,382	14,452	12,551
Other
Disaggregation of Revenue [Line Items]
Revenue	1,121	2,399	4,289	7,615
Operating segments | Services
Disaggregation of Revenue [Line Items]
Revenue	100,677	161,210	229,550	301,507
Operating segments | Services | United States
Disaggregation of Revenue [Line Items]
Revenue	88,205	131,880	197,786	245,015
Operating segments | Services | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	12,046	28,804	30,781	55,513
Operating segments | Services | Europe
Disaggregation of Revenue [Line Items]
Revenue	263	271	371	698
Operating segments | Services | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	163	255	612	281
Operating segments | Services | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	59,279	109,103	142,578	200,769
Operating segments | Services | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	14,248	13,511	28,900	26,305
Operating segments | Services | Industrials
Disaggregation of Revenue [Line Items]
Revenue	10,298	19,638	23,165	35,762
Operating segments | Services | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	7,652	8,352	12,747	14,614
Operating segments | Services | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	4,999	6,384	11,003	12,702
Operating segments | Services | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	2,994	2,806	7,511	5,396
Operating segments | Services | Other
Disaggregation of Revenue [Line Items]
Revenue	1,207	1,416	3,646	5,959
Operating segments | International
Disaggregation of Revenue [Line Items]
Revenue	21,343	37,090	50,410	72,252
Operating segments | International | United States
Disaggregation of Revenue [Line Items]
Revenue	160	57	314	334
Operating segments | International | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	959	1,686	2,464	3,915
Operating segments | International | Europe
Disaggregation of Revenue [Line Items]
Revenue	20,031	33,740	46,266	65,280
Operating segments | International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	193	1,607	1,366	2,723
Operating segments | International | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	7,339	11,767	16,443	21,472
Operating segments | International | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	3,595	10,504	11,010	22,158
Operating segments | International | Industrials
Disaggregation of Revenue [Line Items]
Revenue	3,817	5,459	8,736	10,534
Operating segments | International | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	1,207	2,499	2,904	3,921
Operating segments | International | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	2,610	2,504	4,730	4,746
Operating segments | International | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	2,020	2,517	4,481	5,250
Operating segments | International | Other
Disaggregation of Revenue [Line Items]
Revenue	755	1,840	2,106	4,171
Operating segments | Products
Disaggregation of Revenue [Line Items]
Revenue	4,002	4,269	6,814	7,701
Operating segments | Products | United States
Disaggregation of Revenue [Line Items]
Revenue	2,053	2,977	3,612	4,947
Operating segments | Products | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	72	71	350	137
Operating segments | Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	588	436	928	857
Operating segments | Products | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	1,289	785	1,924	1,760
Operating segments | Products | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	68	465	163	480
Operating segments | Products | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	151	315	298	622
Operating segments | Products | Industrials
Disaggregation of Revenue [Line Items]
Revenue	419	647	907	1,079
Operating segments | Products | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	644	619	1,498	2,000
Operating segments | Products | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	74	68	77	73
Operating segments | Products | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	1,900	1,059	2,460	1,905
Operating segments | Products | Other
Disaggregation of Revenue [Line Items]
Revenue	746	1,096	1,411	1,542
Corp/Elim
Disaggregation of Revenue [Line Items]
Revenue	(1,587)	(1,953)	(2,874)	(4,057)
Corp/Elim | United States
Disaggregation of Revenue [Line Items]
Revenue	(810)	(1,274)	(1,521)	(2,554)
Corp/Elim | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	(93)	(207)	(246)	(264)
Corp/Elim | Europe
Disaggregation of Revenue [Line Items]
Revenue	(662)	(472)	(1,041)	(1,235)
Corp/Elim | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	(22)	0	(66)	(4)
Corp/Elim | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Industrials
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Other
Disaggregation of Revenue [Line Items]
Revenue	$ (1,587)	$ (1,953)	$ (2,874)	$ (4,057)

Share-Based Compensation - Equi

Share-Based Compensation - Equity Incentive Plans (Details)	May 19, 2020shares	Jun. 30, 2020planshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans | plan		2
2009 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards that may be granted (in shares)		0
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in total number of shares authorized for issuance (in shares)	2,000,000
Total number of shares authorized for issuance (in shares)	3,700,000

Share-Based Compensation - Stoc

Share-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 0		$ 0
Common Stock Options
Outstanding at the beginning of the period (in shares)			5	2,105
Granted (in shares)			0	0
Exercised (in shares)			0	(4)
Expired or forfeited (in shares)			0	(7)
Outstanding at the end of the period (in shares)	5	2,094	5	2,094
Weighted Average Exercise Price
Outstanding at the beginning of period (in dollars per share)			$ 22.35	$ 13.47
Granted (in dollars per share)			0	0
Exercised (in dollars per share)			0	10
Expired or forfeited (in dollars per share)			0	10
Outstanding at the end of period (in dollars per share)	$ 22.35	$ 13.48	$ 22.35	$ 13.48
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	$ 0	$ 0	$ 0	$ 0

Share-Based Compensation - Rest

Share-Based Compensation - Restricted Stock Unit Awards - Narrative (Details) - Restricted Stock Unit Awards - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense (benefit)	$ 1.4	$ 1.1	$ 2.1	$ 2
Unrecognized compensation cost, net of estimated forfeitures	$ 6.6		$ 6.6
Weighted-average period over which unrecognized compensation cost is expected to be recognized (years)			2 years 3 months 18 days

Share-Based Compensation - Vest

Share-Based Compensation - Vesting Activity of Restricted Stock Unit Awards (Details) - Restricted Stock Unit Awards - USD ($) shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards vested (in shares)	143	77
Fair value of awards vested	$ 542	$ 1,052

Share-Based Compensation - Full

Share-Based Compensation - Fully-vested Common Stock Issued to Non-employee Directors (Details) - Common Stock - Non-employee Directors shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)directorshares	Jun. 30, 2019USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of non-employee directors to whom fully vested common stock is granted | director	6
Awards issued (in shares) | shares	15	15
Grant date fair value of awards issued | $	$ 57	$ 210

Share-Based Compensation - Re_2

Share-Based Compensation - Restricted Stock Units Awards - Activity (Details) - Restricted Stock Unit Awards - $ / shares shares in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Restricted Stock Units Awards (Units)
Outstanding at beginning of period (in shares)	559	443
Granted (in shares)	557	334
Released (in shares)	(143)	(77)
Forfeited (in shares)	(14)	(23)
Outstanding at end of period (in shares)	959	677
Weighted Average Grant-Date Fair Value (in dollars per share)
Outstanding at the beginning of period (in dollars per share)	$ 16.92	$ 20.55
Granted (in dollars per share)	3.77	14.04
Released (in dollars per share)	16.74	19.88
Forfeited (in dollars per share)	13.74	19.35
Outstanding at end of period (in dollars per share)	$ 9.35	$ 17.46

Share-Based Compensation - Perf

Share-Based Compensation - Performance Restricted Stock Units - Narrative (Details) - PRSUs shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020USD ($)shares	Jun. 30, 2019USD ($)shares	Jun. 30, 2020USD ($)performance_metricshares	Jun. 30, 2019USD ($)shares	Dec. 31, 2019performance_metricshares	Dec. 31, 2018shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance award metrics | performance_metric			4
Number of additional performance award metrics | performance_metric			2
Number of units increased (decreased) during the period (in shares) | shares					1	(3)
Compensation shares classified as liability (in shares) | shares	146		146
Compensation liability (less than) | $	$ 0.1		$ 0.1
Recognized share-based compensation expense (benefit) | $	0.3	$ 0.4	0.6	$ 0.7
Unrecognized compensation cost | $	$ 2		$ 2
Nonvested shares outstanding (in shares) | shares	474	387	474	387	260	277
Weighted-average period over which unrecognized compensation cost is expected to be recognized (years)			2 years 6 months
Executive and Senior Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (years)			1 year
Number of performance award metrics | performance_metric					3
Requisite service period (years)			5 years
Executive and Senior Officers | Anniversary 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			25.00%
Executive and Senior Officers | Anniversary 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			25.00%
Executive and Senior Officers | Anniversary 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			25.00%
Executive and Senior Officers | Anniversary 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			25.00%

Share-Based Compensation - Pe_2

Share-Based Compensation - Performance Restricted Stock Units - Activity (Details) - PRSUs - $ / shares shares in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Performance Restricted Stock (Units)
Outstanding at beginning of period (in shares)	260	277
Granted (in shares)	292	190
Performance condition adjustments (in shares)	1	(3)
Released (in shares)	(79)	(77)
Forfeited (in shares)	0	0
Outstanding at end of period (in shares)	474	387
Weighted Average Grant-Date Fair Value (in dollars per share)
Outstanding at the beginning of period (in dollars per share)	$ 16.77	$ 17.80
Granted (in dollars per share)	3.68	13.63
Performance condition adjustments (in dollars per share)	13.63	18.46
Released (in dollars per share)	15.43	15.86
Forfeited (in dollars per share)	0	0
Outstanding at end of period (in dollars per share)	$ 8.17	$ 15.94

Earnings (loss) per Share (Deta

Earnings (loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic earnings (loss) per share:
Net income (loss) attributable to Mistras Group, Inc.	$ (2,656)	$ 7,431	$ (101,165)	$ 2,138
Denominator:
Weighted-average common shares outstanding (in shares)	29,085	28,657	29,024	28,616
Basic earnings (loss) per share (in dollars per share)	$ (0.09)	$ 0.26	$ (3.49)	$ 0.07
Denominator:
Weighted-average common shares outstanding (in shares)	29,085	28,657	29,024	28,616
Dilutive effect of stock options outstanding (in shares)	0	46	0	131
Dilutive effect of restricted stock units outstanding (in shares)	0	159	0	171
Weighted average common shares outstanding, diluted (in shares)	29,085	28,862	29,024	28,918
Diluted earnings (loss) per share (in dollars per share)	$ (0.09)	$ 0.26	$ (3.49)	$ 0.07

Earnings (loss) per Share - Nar

Earnings (loss) per Share - Narrative (Details) - shares shares in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Restricted Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock excluded from computation of diluted earnings per share due to net loss for the period (in shares)	118	223

Acquisitions and Dispositions -

Acquisitions and Dispositions - Narrative (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Sep. 30, 2019USD ($)Entity	Jun. 30, 2020Entity	Jun. 30, 2019Entity
Business Acquisition [Line Items]
Number of acquisitions | Entity		0	0
Acquisition that Provides Pipeline Integrity Management Software
Business Acquisition [Line Items]
Number of acquisitions | Entity	1
Aggregate consideration paid | $	$ 4,380
Contingent consideration, maximum amount | $	$ 4,300
Contingent consideration payment period based upon achievement of specific performance metrics	3 years

Acquisitions and Dispositions_2

Acquisitions and Dispositions - Estimated Fair Value of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	1 Months Ended
	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill		$ 199,277	$ 282,410
Acquisition that Provides Pipeline Integrity Management Software
Business Combination, Consideration Transferred [Abstract]
Cash paid	$ 4,380
Working capital adjustments	(152)
Fair value of contingent consideration	1,142
Total consideration	5,370
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Current net assets	142
Other assets	34
Property, plant and equipment	65
Intangibles	3,594
Goodwill	1,535
Net assets acquired	$ 5,370

Acquisitions and Dispositions_3

Acquisitions and Dispositions - Acquisition-Related Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Combinations [Abstract]
Due diligence, professional fees and other transaction costs	$ 0	$ 182	$ 0	$ 330
Adjustments to fair value of contingent consideration liabilities	19	367	(523)	672
Acquisition-related expense, net	$ 19	$ 549	$ (523)	$ 1,002

Accounts Receivable, net (Detai

Accounts Receivable, net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Trade accounts receivable	$ 111,658	$ 144,282
Allowance for doubtful accounts	(7,960)	(8,285)
Accounts receivable, net	$ 103,698	$ 135,997

Accounts Receivable, net - Narr

Accounts Receivable, net - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended				6 Months Ended
	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled revenues accrued	$ 22,200	$ 16,600				$ 16,600	$ 22,200
Receivables outstanding balance	135,997	103,698				103,698	135,997
Provision (reversal) of allowance for doubtful accounts receivables		0	$ (2,693)			0		$ 2,798
Texas Customer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables outstanding balance		$ 1,400				$ 1,400
Amount of damages claimed	$ 1,400
Provision (reversal) of allowance for doubtful accounts receivables							$ 1,400
Renewable Energy Industry Customer | Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (reversal) of allowance for doubtful accounts receivables			(1,000)	$ 5,700	$ 700
Recovery from bad debt provision			$ 1,700	$ 200

Property, Plant and Equipment_3

Property, Plant and Equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment, net
Property, plant and equipment, gross	$ 274,348		$ 274,348		$ 270,410
Accumulated depreciation and amortization	(181,110)		(181,110)		(171,803)
Property, plant and equipment, net	93,238		93,238		98,607
Depreciation and amortization expense	6,000	$ 6,100	12,100	$ 12,200
Depreciation and amortization expense	6,000	$ 6,100	12,100	$ 12,200
Land
Property, Plant and Equipment, net
Property, plant and equipment, gross	2,669		2,669		2,672
Buildings and improvements
Property, Plant and Equipment, net
Property, plant and equipment, gross	24,543		$ 24,543		24,537
Buildings and improvements | Minimum
Property, Plant and Equipment, net
Useful Life (Years)			30 years
Buildings and improvements | Maximum
Property, Plant and Equipment, net
Useful Life (Years)			40 years
Office furniture and equipment
Property, Plant and Equipment, net
Property, plant and equipment, gross	19,465		$ 19,465		17,227
Office furniture and equipment | Minimum
Property, Plant and Equipment, net
Useful Life (Years)			5 years
Office furniture and equipment | Maximum
Property, Plant and Equipment, net
Useful Life (Years)			8 years
Machinery and equipment
Property, Plant and Equipment, net
Property, plant and equipment, gross	$ 227,671		$ 227,671		$ 225,974
Machinery and equipment | Minimum
Property, Plant and Equipment, net
Useful Life (Years)			5 years
Machinery and equipment | Maximum
Property, Plant and Equipment, net
Useful Life (Years)			7 years

Goodwill - Changes in Carrying

Goodwill - Changes in Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2019	$ 282,410
Goodwill acquired during the period	0
Impairment charges	(77,089)
Adjustments to preliminary purchase price allocations	0
Foreign currency translation	(6,044)
Balance at June 30, 2020	199,277
Services
Goodwill [Roll Forward]
Balance at December 31, 2019	247,215
Goodwill acquired during the period	0
Impairment charges	(57,227)
Adjustments to preliminary purchase price allocations	0
Foreign currency translation	(5,263)
Balance at June 30, 2020	184,725
International
Goodwill [Roll Forward]
Balance at December 31, 2019	35,195
Goodwill acquired during the period	0
Impairment charges	(19,862)
Adjustments to preliminary purchase price allocations	0
Foreign currency translation	(781)
Balance at June 30, 2020	14,552
Products and Systems
Goodwill [Roll Forward]
Balance at December 31, 2019	0
Goodwill acquired during the period	0
Impairment charges	0
Adjustments to preliminary purchase price allocations	0
Foreign currency translation	0
Balance at June 30, 2020	$ 0

Goodwill - Narrative (Details)

Goodwill - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill impairment charge		$ 77,089
Cumulative goodwill impairment		100,200	$ 23,100
COVID-19
Goodwill [Line Items]
Goodwill impairment charge	$ 77,100
Services
Goodwill [Line Items]
Goodwill impairment charge		57,227
Cumulative goodwill impairment		57,200
Services | COVID-19
Goodwill [Line Items]
Goodwill impairment charge	57,200
International
Goodwill [Line Items]
Goodwill impairment charge		19,862
Cumulative goodwill impairment		29,800	9,900
European Reporting Unit | COVID-19
Goodwill [Line Items]
Goodwill impairment charge	19,300
Brazilian Reporting Unit | COVID-19
Goodwill [Line Items]
Goodwill impairment charge	$ 600
Products and Systems
Goodwill [Line Items]
Goodwill impairment charge		0
Cumulative goodwill impairment		$ 13,200	$ 13,200

Intangible Assets (Details)

Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 211,264	$ 215,383
Accumulated Amortization	(111,622)	(105,846)
Impairment	(28,794)
Net Carrying Amount	70,848	109,537
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	112,813	113,861
Accumulated Amortization	(70,370)	(67,853)
Impairment	(2,206)
Net Carrying Amount	$ 40,237	46,008
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	5 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	18 years
Software/Technology
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 74,899	77,914
Accumulated Amortization	(21,365)	(18,756)
Impairment	(25,874)
Net Carrying Amount	$ 27,660	59,158
Software/Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	3 years
Software/Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	15 years
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 12,688	12,795
Accumulated Amortization	(11,846)	(11,630)
Impairment	(212)
Net Carrying Amount	$ 630	1,165
Covenants not to compete | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	2 years
Covenants not to compete | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	5 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 10,864	10,813
Accumulated Amortization	(8,041)	(7,607)
Impairment	(502)
Net Carrying Amount	$ 2,321	$ 3,206
Other | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	2 years
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	12 years

Intangible Assets - Narrative (

Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangibles	$ 2.6		$ 3.5	$ 5.9	$ 7.1
COVID-19
Finite-Lived Intangible Assets [Line Items]
Impairment of intangibles		$ 28.8
COVID-19 | Services
Finite-Lived Intangible Assets [Line Items]
Impairment of intangibles		28.8
Software/Technology | COVID-19 | Services
Finite-Lived Intangible Assets [Line Items]
Impairment of intangibles		25.9
Customer relationships | COVID-19 | Services
Finite-Lived Intangible Assets [Line Items]
Impairment of intangibles		2.2
Other | COVID-19 | Services
Finite-Lived Intangible Assets [Line Items]
Impairment of intangibles		0.5
Covenants not to compete | COVID-19 | Services
Finite-Lived Intangible Assets [Line Items]
Impairment of intangibles		$ 0.2

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued salaries, wages and related employee benefits	$ 27,014	$ 30,072
Contingent consideration, current portion	1,023	2,614
Accrued workers’ compensation and health benefits	4,434	4,467
Deferred revenue	6,861	5,860
Pension accrual	2,519	2,519
Right-of-use liability - operating	9,857	10,133
Other accrued expenses	25,600	25,724
Total	$ 77,308	$ 81,389

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 239,396	$ 254,713
Less: Current portion	(8,735)	(6,593)
Long-term debt, net of current portion	230,661	248,120
Senior credit facility
Debt Instrument [Line Items]
Total debt	138,033	151,773
Senior credit facility | Senior Secured Term Loan
Debt Instrument [Line Items]
Total debt	92,202	94,919
Debt issuance costs	300	300
Other
Debt Instrument [Line Items]
Total debt	$ 9,161	$ 8,021

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Details)	May 15, 2020USD ($)d	Jun. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Debt outstanding		$ 239,396,000	$ 239,396,000	$ 254,713,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity in non-U.S. Dollar currencies		100,000,000	100,000,000
Maximum amount available for the issuance of letters of credit		20,000,000	20,000,000
Outstanding borrowings		230,200,000	230,200,000
Outstanding letters of credit		3,900,000	3,900,000
Capitalized costs associated with debt modifications		1,300,000	1,300,000
Capitalized debt issuance costs expensed		600,000
Debt outstanding		138,033,000	138,033,000	151,773,000
Revolving Credit Facility | Senior Secured Term A Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		100,000,000	100,000,000
Debt outstanding		92,202,000	92,202,000	94,919,000
Revolving Credit Facility | Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000,000
Revolving Credit Facility | Credit Agreement | COVID-19
Debt Instrument [Line Items]
Maximum borrowing capacity		175,000,000	175,000,000
Amount deducted from aggregate cash and cash equivalents held by company and it's subsidiaries if prepayment of credit facility is required	$ 10,000,000
Number of consecutive business days | d	2
Maximum amount outstanding under the revolving credit facility if prepayment of facility is required	$ 75,000,000
Cash and cash equivalents if prepayment of facility is required	$ 10,000,000
Revolving Credit Facility | Credit Agreement | COVID-19 | Maximum
Debt Instrument [Line Items]
Funded debt leverage ratio for acquisitions	2.50
Pro forma funded debt leverage ratio	3.25
Revolving Credit Facility | Credit Agreement | COVID-19 | LIBOR
Debt Instrument [Line Items]
Margin percentage	1.00%
Revolving Credit Facility | Credit Agreement | COVID-19 | LIBOR | Minimum
Debt Instrument [Line Items]
Margin percentage	1.50%
Revolving Credit Facility | Credit Agreement | COVID-19 | LIBOR | Maximum
Debt Instrument [Line Items]
Margin percentage	4.15%
Revolving Credit Facility | Credit Agreement | COVID-19 | Quarter ending December 31, 2020 and decreasing each successive quarter
Debt Instrument [Line Items]
Funded debt leverage ratio	5.25
Revolving Credit Facility | Credit Agreement | COVID-19 | Quarter ending September 30, 2021 and all quarterly periods thereafter
Debt Instrument [Line Items]
Funded debt leverage ratio	3.50
Revolving Credit Facility | Credit Agreement | COVID-19 | Quarter ending March 31, 2021
Debt Instrument [Line Items]
Fixed charge coverage ratio	1
Revolving Credit Facility | Credit Agreement | COVID-19 | Quarter ending June 30, 2021
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.25
Revolving Credit Facility | Credit Agreement | COVID-19 | Three months ending June 30, 2020
Debt Instrument [Line Items]
Debt covenant, minimum EBITDA, amount	$ 3,440,000
Revolving Credit Facility | Credit Agreement | COVID-19 | Six months ending September 30, 2020
Debt Instrument [Line Items]
Debt covenant, minimum EBITDA, amount	24,250,000
Revolving Credit Facility | Credit Agreement | COVID-19 | Nine months ending December 31, 2020
Debt Instrument [Line Items]
Debt covenant, minimum EBITDA, amount	38,550,000
Revolving Credit Facility | Credit Agreement | COVID-19 | At all times through September 30, 2021
Debt Instrument [Line Items]
Debt covenant, minimum EBITDA, amount	$ 20,000,000
Other
Debt Instrument [Line Items]
Debt outstanding		$ 9,161,000	9,161,000	$ 8,021,000
Other | Minimum
Debt Instrument [Line Items]
Debt monthly periodic payments			$ 1,000
Interest rate		0.40%	0.40%
Other | Maximum
Debt Instrument [Line Items]
Debt monthly periodic payments			$ 17,000
Interest rate		3.50%	3.50%

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Contingent Consideration Liability [Roll Forward]
Revaluation	$ 19	$ 367	$ (523)	$ 672
Level 3
Contingent Consideration Liability [Roll Forward]
Beginning balance			3,216	2,365
Payments			(1,303)	0
Accretion of liability			30	75
Revaluation			(553)	597
Foreign currency translation			(34)	58
Ending balance	$ 1,356	$ 3,095	$ 1,356	$ 3,095

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
ROU assets	$ 43,458	$ 45,817
Liabilities
ROU - current	9,857	10,133
ROU liability - long-term	34,843	36,750
Total ROU liabilities	$ 44,700	$ 46,883
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherNoncurrentAssetsMember	us-gaap:OtherNoncurrentAssetsMember
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	mg:AccruedExpensesAndOtherLiabilitiesCurrent	mg:AccruedExpensesAndOtherLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
ROU operating lease liabilities	$ 44,700			$ 44,700		$ 46,883
Operating rental payments				6,562	$ 6,196
ROU finance lease assets	$ 17,300			$ 17,300		$ 19,200
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization			us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization		us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
COVID-19
Lessee, Lease, Description [Line Items]
Impairment of ROU assets		$ 200
COVID-19 | Services
Lessee, Lease, Description [Line Items]
Impairment of ROU assets		$ 200
Operating Lease Arrangement | Company's Headquarters
Lessee, Lease, Description [Line Items]
ROU operating lease liabilities	$ 4,200			$ 4,200		$ 4,500
Operating rental payments	$ 200		$ 200	$ 400	$ 500
Operating Lease Arrangement | Company's Headquarters | COVID-19
Lessee, Lease, Description [Line Items]
Percentage of reduction of rental payments	20.00%
Deferral period of rental payments	90 days

Leases - Components of Lease Co

Leases - Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finance lease expense
Amortization of ROU assets	$ 1,133	$ 1,226	$ 2,375	$ 2,403
Interest on lease liabilities	216	189	437	380
Operating lease expense	3,317	3,139	6,664	6,259
Short-term lease expense	1	2	2	6
Variable lease expense	114	273	437	518
Total	$ 4,781	$ 4,829	$ 9,915	$ 9,566

Leases - Additional Information

Leases - Additional Information Related to Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities for finance leases
Finance - financing cash flows	$ 2,132	$ 2,411
Finance - operating cash flows	437	380
Operating - operating cash flows	6,562	6,196
ROU assets obtained in the exchange for lease liabilities
Finance leases	1,266	2,887
Operating leases	$ 2,451	$ 8,962
Weighted-average remaining lease term (in years)
Finance leases	5 years 10 months 24 days	5 years 9 months 18 days
Operating leases	6 years	6 years
Weighted-average discount rate
Finance leases	5.90%	6.30%
Operating leases	5.80%	6.00%

Leases - Maturity of Lease Liab

Leases - Maturity of Lease Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finance
Remainder of 2020	$ 3,280
2021	4,518
2022	3,678
2023	2,806
2024	1,893
Thereafter	1,096
Total	17,271
Less: Present value discount	(1,665)
Lease liability	15,606
Operating
Remainder of 2020	6,367
2021	10,933
2022	8,853
2023	7,367
2024	5,755
Thereafter	14,094
Total	53,369
Less: Present value discount	(8,669)
Lease liability	$ 44,700	$ 46,883

Commitments and Contingencies (

Commitments and Contingencies (Details)	1 Months Ended			6 Months Ended	12 Months Ended
	Dec. 31, 2019USD ($)welds	Sep. 30, 2019USD ($)	Apr. 30, 2017	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)welds	Dec. 31, 2018USD ($)	Jan. 01, 2020USD ($)
Litigation
Accounts receivable, net	$ 135,997,000			$ 103,698,000	$ 135,997,000
Pension accrual	2,519,000			2,519,000	2,519,000
Right to Customer Contracts | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Litigation
Consideration received on sale of subsidiary							$ 100,000
Contingency charges				400,000
Payments of severance obligations				300,000
Reversal of severance obligations				800,000
Foreign Subsidiaries | Products and Systems | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Litigation
Term of agreement to purchase products from the buyer on sale of subsidiary						3 years
Amount of purchased commitment to buy products from the buyer on sale of subsidiary						$ 2,300,000
Remaining balance under purchase commitment agreement				1,300,000
Pension Related Contingencies
Litigation
Pension withdrawal expense		$ 900,000			$ 800,000	$ 5,900,000
Monthly payments, excluding final settlement				3,300,000
Total payments				4,200,000
Severance and Labor Disputes | Germany | Affiliated Entity
Litigation
Temporary employment contract period			18 months
Acquisition-related Contingencies
Litigation
Potential acquisition-related contingent consideration, low end of range				0
Potential acquisition-related contingent consideration, high end of range				$ 5,700,000
Contingent consideration payment period based upon achievement of specific performance metrics				2 years 2 months 12 days
Various Pipeline Projects For Texas Customer
Litigation
Amount of damages claimed	$ 7,600,000
Texas Customer
Litigation
Accounts receivable, net				$ 1,400,000
Number or welds not in compliance | welds	66				66
Number of welds inspected (over) | welds	16,000				16,000
Amount of damages claimed	$ 1,400,000
Texas Customer | Various Pipeline Projects For Texas Customer
Litigation
Amount of damages claimed	$ 1,400,000

Segment Disclosure (Details)

Segment Disclosure (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)segment	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			3
Financial information by segment
Revenue	$ 124,435	$ 200,616	$ 283,900	$ 377,403
Gross profit	41,158	60,071	81,802	108,945
Income (loss) from operations	(383)	15,419	(111,611)	11,023
Depreciation and amortization	8,530	9,601	17,997	19,269
Intangible assets, net	70,848		70,848		$ 109,537
Total assets	567,678		567,678		719,878
Operating segments | Services
Financial information by segment
Revenue	100,677	161,210	229,550	301,507
Gross profit	33,940	47,208	66,177	84,573
Income (loss) from operations	10,837	20,905	(70,657)	24,958
Depreciation and amortization	6,211	7,209	13,286	14,478
Intangible assets, net	60,713		60,713		98,284
Total assets	409,745		409,745		537,518
Operating segments | International
Financial information by segment
Revenue	21,343	37,090	50,410	72,252
Gross profit	5,392	11,058	13,415	21,418
Income (loss) from operations	(1,937)	2,450	(22,356)	2,234
Depreciation and amortization	2,077	2,042	4,217	4,131
Intangible assets, net	8,859		8,859		9,814
Total assets	124,519		124,519		153,380
Operating segments | Products and Systems
Financial information by segment
Revenue	4,002	4,269	6,814	7,701
Gross profit	1,838	1,825	2,206	3,064
Income (loss) from operations	(96)	(405)	(1,776)	(1,733)
Depreciation and amortization	255	300	508	589
Intangible assets, net	1,095		1,095		1,181
Total assets	15,426		15,426		16,028
Corporate and eliminations
Financial information by segment
Revenue	(1,587)	(1,953)	(2,874)	(4,057)
Gross profit	(12)	(20)	4	(110)
Income (loss) from operations	(9,187)	(7,531)	(16,822)	(14,436)
Depreciation and amortization	(13)	$ 50	(14)	$ 71
Intangible assets, net	181		181		258
Total assets	$ 17,988		$ 17,988		$ 12,952

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event - Mikisew-Mistras Limited Partnership - Joint Venture	Jul. 03, 2020
Mikisew
Subsequent Event [Line Items]
Limited partner, ownership percentage	51.00%
Corporate general partner, ownership percentage	51.00%
Canadian Subsidiary
Subsequent Event [Line Items]
Limited partner, ownership percentage	49.00%
Corporate general partner, ownership percentage	49.00%