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REVENUE (Tables) | 12 Months Ended
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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, net 1 | $ | 268,352 |  |  | $ | 301,963 |
Contract assets 2 | $ | 5,745 |  |  | $ | 9,823 |
Contract liabilities 3 | $ | 1,784 |  |  | $ | 5,415 |
_________________ 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.

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