REVENUE (Tables)

12 Months Ended

Dec. 31, 2019

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, 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, 2018
	United States and Canada		Other Countries		Total
Revenue:
IHT	$	602,615	$	14,763	$	617,378
MS	383,405		148,960		532,365
Quest Integrity	62,262		34,924		97,186
Total	$	1,048,282	$	198,647	$	1,246,929

	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

	Twelve Months Ended December 31, 2018
	Non-Destructive Evaluation and Testing Services1		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	493,806	$	27,420	$	80,840	$	15,312	$	617,378
MS	402		523,701		2,753		5,509		532,365
Quest Integrity	97,186		—		—		—		97,186
Total	$	591,394	$	551,121	$	83,593	$	20,821	$	1,246,929

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1 This service type comprises the “Asset Integrity Management” and “Non-Destructive Evaluation” service types as disclosed in the 2018 Form 10-K.

Contract with Customer, Asset and Liability

The following table provides information about trade accounts receivable, contract assets and contract liabilities as of December 31, 2019 and December 31, 2018 (in thousands):

	December 31, 2019		December 31, 2018
Trade accounts receivable, net1	$	245,617	$	268,352
Contract assets2	$	4,671	$	5,745
Contract liabilities3	$	1,224	$	1,784

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1    Includes billed and unbilled amounts, net of allowance for doubtful accounts. 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.