REVENUE (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021
	United States and Canada		Other Countries		Total
Revenue:
IHT	$	405,007	$	10,364	$	415,371
MS	256,806		122,020		378,826
Quest Integrity	47,511		32,845		80,356
Total	$	709,324	$	165,229	$	874,553

	Twelve Months Ended December 31, 2020
	United States and Canada		Other Countries		Total
Revenue:
IHT	$	365,847	$	8,893	$	374,740
MS	278,882		113,602		392,484
Quest Integrity	49,117		36,198		85,315
Total	$	693,846	$	158,693	$	852,539

	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
Quest Integrity	80,356		—		—		—		80,356
Total	$	405,560	$	375,352	$	60,661	$	32,980	$	874,553

	Twelve Months Ended December 31, 2020
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	294,838	$	206	$	50,220	$	29,476	$	374,740
MS	—		388,313		1,088		3,083		392,484
Quest Integrity	85,315		—		—		—		85,315
Total	$	380,153	$	388,519	$	51,308	$	32,559	$	852,539

Contract with Customer, Asset and Liability

The following table provides information about trade accounts receivable, contract assets and contract liabilities as of December 31, 2021 and 2020 (in thousands):

	December 31, 2021		December 31, 2020
Trade accounts receivable, net1	$	188,772	$	194,066
Contract assets2	$	1,602	$	5,242
Contract liabilities3	$	313	$	930

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1    Includes billed and unbilled amounts, net of allowance for credit losses. See Note 3 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.