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Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Income (loss)	$ 3,397	$ 1,553	$ 3,983	$ (99,634)
Other comprehensive income (loss):
Foreign currency translation adjustments	(5,472)	5,963	(3,117)	(4,924)
Comprehensive Income (Loss)	(2,075)	7,516	866	(104,558)
Less: net income attributable to noncontrolling interests, net of taxes	17	30	28	8
Less: Foreign currency translation adjustments attributable to noncontrolling interests	(3)	4	(2)	(2)
Comprehensive income (loss) attributable to Mistras Group, Inc	$ (2,089)	$ 7,482	$ 840	$ (104,564)

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