REVENUE (Tables)

12 Months Ended

Dec. 31, 2018

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, 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, 2018
	Asset Integrity Management		Repair and Maintenance Services		Heat Treating		Non-Destructive Evaluation		Other		Total
Revenue:
IHT	$	46,726	$	27,420	$	80,840	$	447,080	$	15,312	$	617,378
MS	402		523,701		2,753		—		5,509		532,365
Quest Integrity	97,186		—		—		—		—		97,186
Total	$	144,314	$	551,121	$	83,593	$	447,080	$	20,821	$	1,246,929

For additional information on our reportable operating segments and geographic information, refer to Note 15.

Contract with Customer, Asset and Liability

The following table provides information about trade accounts receivable, contract assets and contract liabilities as of December 31, 2018 and January 1, 2018, the date of adoption of ASC 606, (in thousands):

	December 31, 2018		January 1, 2018
Trade accounts receivable, net1	$	268,352	$	301,963
Contract assets2	$	5,745	$	9,823
Contract liabilities3	$	1,784	$	5,415

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1    Includes billed and unbilled amounts, net of allowance for doubtful accounts. See Note 4 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.