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REVENUE (Tables) | 3 Months Ended
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Mar. 31, 2022
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): Geographic area:
| Three Months Ended March 31, 2022 |  | Three Months Ended March 31, 2021
| (unaudited) |  | (unaudited)
| United States and Canada |  | Other Countries |  | Total |  | United States and Canada |  | Other Countries |  | Total
Revenue: |  |  |  |  |  |  |  |  |  |  |
IHT | $ | 93,376 |  |  | $ | 2,219 |  |  | $ | 95,595 |  |  | $ | 89,225 |  |  | $ | 1,914 |  |  | $ | 91,139 |
MS | 63,931 |  |  | 29,510 |  |  | 93,441 |  |  | 60,046 |  |  | 27,350 |  |  | 87,396 |
Quest Integrity | 14,691 |  |  | 14,849 |  |  | 29,540 |  |  | 9,055 |  |  | 7,028 |  |  | 16,083 |
Total | $ | 171,998 |  |  | $ | 46,578 |  |  | $ | 218,576 |  |  | $ | 158,326 |  |  | $ | 36,292 |  |  | $ | 194,618 |
| Three Months Ended March 31, 2022
| (unaudited)
| Non-Destructive Evaluation and Testing Services |  | Repair and Maintenance Services |  | Heat Treating |  |  |  | Other |  | Total
Revenue: |  |  |  |  |  |  |  |  |  |  |
IHT | $ | 76,449 |  |  | $ | 24 |  |  | $ | 13,839 |  |  |  |  | $ | 5,283 |  |  | $ | 95,595 |
MS | — |  |  | 91,770 |  |  | 57 |  |  |  |  | 1,614 |  |  | 93,441 |
Quest Integrity | 29,540 |  |  | — |  |  | — |  |  |  |  | — |  |  | 29,540 |
Total | $ | 105,989 |  |  | $ | 91,794 |  |  | $ | 13,896 |  |  |  |  | $ | 6,897 |  |  | $ | 218,576 |
| Three Months Ended March 31, 2021
| (unaudited)
| Non-Destructive Evaluation and Testing Services |  | Repair and Maintenance Services |  | Heat Treating |  |  |  | Other |  | Total
Revenue: |  |  |  |  |  |  |  |  |  |  |
IHT | $ | 71,530 |  |  | $ | 81 |  |  | $ | 13,455 |  |  |  |  | $ | 6,073 |  |  | $ | 91,139 |
MS | — |  |  | 85,976 |  |  | 689 |  |  |  |  | 731 |  |  | 87,396 |
Quest Integrity | 16,083 |  |  | — |  |  | — |  |  |  |  | — |  |  | 16,083 |
Total | $ | 87,613 |  |  | $ | 86,057 |  |  | $ | 14,144 |  |  |  |  | $ | 6,804 |  |  | $ | 194,618 |
Contract with Customer, Asset and Liability | The following table provides information about trade accounts receivable, contract assets and contract liabilities as of March 31, 2022 and December 31, 2021 (in thousands):
| March 31, 2022 |  | December 31, 2021 |  | Change
| (unaudited) |  |  |  |
Trade accounts receivable, net 1 | $ | 207,779 |  |  | $ | 188,772 |  |  | $ | 19,007 |
Contract assets 2 | $ | 1,011 |  |  | $ | 1,602 |  |  | $ | (591) |
Contract liabilities 3 | $ | 1,588 |  |  | $ | 313 |  |  | $ | 1,275 |
_________________ 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.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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