REVENUE (Tables)

6 Months Ended

Jun. 30, 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):

	Three Months Ended June 30, 2019						Three Months Ended June 30, 2018
	(unaudited)						(unaudited)
	United States and Canada		Other Countries		Total		United States and Canada		Other Countries		Total
Revenue:
IHT	$	134,068	$	4,590	$	138,658	$	164,983	$	3,690	$	168,673
MS	107,176		37,721		144,897		111,964		37,014		148,978
Quest Integrity	24,649		7,625		32,274		16,990		9,248		26,238
Total	$	265,893	$	49,936	$	315,829	$	293,937	$	49,952	$	343,889

	Six Months Ended June 30, 2019						Six Months Ended June 30, 2018
	(unaudited)						(unaudited)
	United States and Canada		Other Countries		Total		United States and Canada		Other Countries		Total
Revenue:
IHT	$	257,688	$	8,026	$	265,714	$	313,193	$	6,899	$	320,092
MS	194,628		71,795		266,423		211,788		70,091		281,879
Quest Integrity	39,006		14,285		53,291		29,700		14,603		44,303
Total	$	491,322	$	94,106	$	585,428	$	554,681	$	91,593	$	646,274

	Three Months Ended June 30, 2019
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	107,991	$	136	$	17,511	$	13,020	$	138,658
MS	—		142,908		920		1,069		144,897
Quest Integrity	32,274		—		—		—		32,274
Total	$	140,265	$	143,044	$	18,431	$	14,089	$	315,829

Contract with Customer, Asset and Liability

The following table provides information about trade accounts receivable, contract assets and contract liabilities as of June 30, 2019 and December 31, 2018 (in thousands):

	June 30, 2019		December 31, 2018
	(unaudited)
Trade accounts receivable, net1	$	265,104	$	268,352
Contract assets2	$	7,367	$	5,745
Contract liabilities3	$	1,738	$	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 condensed consolidated balance sheets.

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