REVENUE (Tables)

9 Months Ended

Sep. 30, 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):

	Three Months Ended September 30, 2020						Three Months Ended September 30, 2019
	(unaudited)						(unaudited)
	United States and Canada		Other Countries		Total		United States and Canada		Other Countries		Total
Revenue:
IHT	$	94,414	$	2,223	$	96,637	$	121,772	$	4,607	$	126,379
MS	73,204		28,534		101,738		101,929		33,696		135,625
Quest Integrity	12,382		8,336		20,718		18,370		9,705		28,075
Total	$	180,000	$	39,093	$	219,093	$	242,071	$	48,008	$	290,079

	Nine Months Ended September 30, 2020						Nine Months Ended September 30, 2019
	(unaudited)						(unaudited)
	United States and Canada		Other Countries		Total		United States and Canada		Other Countries		Total
Revenue:
IHT	$	277,947	$	7,045	$	284,992	$	379,460	$	12,633	$	392,093
MS	217,189		81,888		299,077		296,557		105,491		402,048
Quest Integrity	35,967		25,200		61,167		57,376		23,990		81,366
Total	$	531,103	$	114,133	$	645,236	$	733,393	$	142,114	$	875,507

	Three Months Ended September 30, 2020
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	77,323	$	—	$	12,667	$	6,647	$	96,637
MS	—		101,032		221		485		101,738
Quest Integrity	20,718		—		—		—		20,718
Total	$	98,041	$	101,032	$	12,888	$	7,132	$	219,093

	Three Months Ended September 30, 2019
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	102,448	$	100	$	16,500	$	7,331	$	126,379
MS	—		134,096		382		1,147		135,625
Quest Integrity	28,075		—		—		—		28,075
Total	$	130,523	$	134,196	$	16,882	$	8,478	$	290,079

	Nine Months Ended September 30, 2020
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	226,693	$	121	$	37,583	$	20,595	$	284,992
MS	—		295,741		896		2,440		299,077
Quest Integrity	61,167		—		—		—		61,167
Total	$	287,860	$	295,862	$	38,479	$	23,035	$	645,236

	Nine Months Ended September 30, 2019
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	313,375	$	598	$	52,804	$	25,316	$	392,093
MS	—		396,493		2,041		3,514		402,048
Quest Integrity	81,366		—		—		—		81,366
Total	$	394,741	$	397,091	$	54,845	$	28,830	$	875,507

Contract with Customer, Asset and Liability

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

	September 30, 2020		December 31, 2019
	(unaudited)
Trade accounts receivable, net1	$	214,361	$	245,617
Contract assets2	$	6,565	$	4,671
Contract liabilities3	$	940	$	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 condensed consolidated balance sheets.

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