REVENUE (Tables)

3 Months Ended

Mar. 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):

	Three Months Ended March 31, 2019						Three Months Ended March 31, 2018
	(unaudited)						(unaudited)
	United States and Canada		Other Countries		Total		United States and Canada		Other Countries		Total
Revenue:
IHT	$	123,620	$	3,436	$	127,056	$	148,210	$	3,209	$	151,419
MS	87,452		34,074		121,526		99,824		33,077		132,901
Quest Integrity	14,357		6,660		21,017		12,710		5,355		18,065
Total	$	225,429	$	44,170	$	269,599	$	260,744	$	41,641	$	302,385

	Three Months Ended March 31, 2019
	(unaudited)
	Non-Destructive Evaluation and Testing Services1		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	102,936	$	362	$	18,793	$	4,965	$	127,056
MS	—		119,489		739		1,298		121,526
Quest Integrity	21,017		—		—		—		21,017
Total	$	123,953	$	119,851	$	19,532	$	6,263	$	269,599

Contract with Customer, Asset and Liability

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

	March 31, 2019		December 31, 2018
	(unaudited)
Trade accounts receivable, net1	$	244,306	$	268,352
Contract assets2	$	6,748	$	5,745
Contract liabilities3	$	2,014	$	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 sheet.

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