REVENUE (Tables)

6 Months Ended

Jun. 30, 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):

	Three Months Ended June 30, 2021						Three Months Ended June 30, 2020
	(unaudited)						(unaudited)
	United States and Canada		Other Countries		Total		United States and Canada		Other Countries		Total
Revenue:
IHT	$	114,834	$	2,628	$	117,462	$	78,234	$	2,240	$	80,474
MS	65,303		31,864		97,167		67,403		25,417		92,820
Quest Integrity	16,480		7,764		24,244		10,748		5,262		16,010
Total	$	196,617	$	42,256	$	238,873	$	156,385	$	32,919	$	189,304

	Six Months Ended June 30, 2021						Six Months Ended June 30, 2020
	(unaudited)						(unaudited)
	United States and Canada		Other Countries		Total		United States and Canada		Other Countries		Total
Revenue:
IHT	$	204,059	$	4,542	$	208,601	$	183,536	$	4,819	$	188,355
MS	125,349		59,214		184,563		143,985		53,354		197,339
Quest Integrity	25,535		14,792		40,327		23,582		16,867		40,449
Total	$	354,943	$	78,548	$	433,491	$	351,103	$	75,040	$	426,143

	Three Months Ended June 30, 2021
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	92,291	$	207	$	17,267	$	7,697	$	117,462
MS	—		97,149		8		10		97,167
Quest Integrity	24,244		—		—		—		24,244
Total	$	116,535	$	97,356	$	17,275	$	7,707	$	238,873

	Three Months Ended June 30, 2020
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	62,963	$	62	$	10,770	$	6,679	$	80,474
MS	—		92,094		196		530		92,820
Quest Integrity	16,010		—		—		—		16,010
Total	$	78,973	$	92,156	$	10,966	$	7,209	$	189,304

	Six Months Ended June 30, 2021
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	163,820	$	288	$	30,722	$	13,771	$	208,601
MS	—		183,125		697		741		184,563
Quest Integrity	40,327		—		—		—		40,327
Total	$	204,147	$	183,413	$	31,419	$	14,512	$	433,491

	Six Months Ended June 30, 2020
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	149,370	$	163	$	24,916	$	13,906	$	188,355
MS	—		194,709		675		1,955		197,339
Quest Integrity	40,449		—		—		—		40,449
Total	$	189,819	$	194,872	$	25,591	$	15,861	$	426,143

Contract with Customer, Asset and Liability

Trade accounts receivable, contract assets and contract liabilities consisted of the following (in thousands):

	June 30, 2021		December 31, 2020
	(unaudited)
Trade accounts receivable, net1	$	217,461	$	194,066
Contract assets2	$	1,453	$	5,242
Contract liabilities3	$	893	$	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 condensed consolidated balance sheets.

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