REVENUE (Tables)

12 Months Ended

Dec. 31, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

A disaggregation of our revenue from contracts with customers by geographic region, by reportable operating segment and by service type is presented below (in thousands):

	Twelve Months Ended December 31, 2022
	United States and Canada		Other Countries		Total
Revenue:
IHT	$	412,661	$	9,901	$	422,562
MS	296,151		121,495		417,646
Total	$	708,812	$	131,396	$	840,208

	Twelve Months Ended December 31, 2021
	United States and Canada		Other Countries		Total
Revenue:
IHT	$	405,007	$	10,364	$	415,371
MS	256,806		122,020		378,826
Total	$	661,813	$	132,384	$	794,197

	Twelve Months Ended December 31, 2022
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	336,821	$	180	$	61,526	$	24,035	$	422,562
MS	—		413,424		276		3,946		417,646
Total	$	336,821	$	413,604	$	61,802	$	27,981	$	840,208

	Twelve Months Ended December 31, 2021
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	325,204	$	467	$	59,855	$	29,845	$	415,371
MS	—		374,885		806		3,135		378,826
Total	$	325,204	$	375,352	$	60,661	$	32,980	$	794,197

Contract with Customer, Asset and Liability

The following table provides information about trade accounts receivable, contract assets and contract liabilities as of December 31, 2022 and 2021 (in thousands):

	December 31,
	2022		2021
Trade accounts receivable, net1	$	186,689	$	168,273
Contract assets2	$	2	$	2
Contract liabilities3	$	—	$	80

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1    Includes billed and unbilled amounts, net of allowance for credit losses. See Note 4 - Receivables for details.    

2    Included in the “Prepaid expenses and other current assets” line on the consolidated balance sheet.

3    Included in the “Other accrued liabilities” line of the consolidated balance sheet.