REVENUE (Tables)

12 Months Ended

Dec. 31, 2020

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, 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, 2019
	United States and Canada		Other Countries		Total
Revenue:
IHT	$	496,789	$	16,161	$	512,950
MS	393,120		142,252		535,372
Quest Integrity	76,050		38,942		114,992
Total	$	965,959	$	197,355	$	1,163,314

	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

	Twelve Months Ended December 31, 2019
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	409,413	$	755	$	71,689	$	31,093	$	512,950
MS	—		527,020		2,773		5,579		535,372
Quest Integrity	114,992		—		—		—		114,992
Total	$	524,405	$	527,775	$	74,462	$	36,672	$	1,163,314

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Contract with Customer, Asset and Liability

The following table provides information about trade accounts receivable, contract assets and contract liabilities as of December 31, 2020 and 2019 (in thousands):

	December 31, 2020		December 31, 2019
Trade accounts receivable, net1	$	194,066	$	245,617
Contract assets2	$	5,242	$	4,671
Contract liabilities3	$	930	$	1,224

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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.