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REVENUES (Tables) | 3 Months Ended
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Mar. 31, 2021
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | We disaggregate the Company's third party revenues by geographic location and source of revenue as we believe these categories depict how revenue and cash flows are affected by economic factors (in thousands):
|  | For the Three Months Ended March 31, 2021
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 575,508 |  |  | $ | 138,990 |  |  | $ | 79 |  |  | $ | 714,577 |
Canada |  | 77,370 |  |  | 16,201 |  |  | — |  |  | 93,571 |
Total third-party revenues |  | $ | 652,878 |  |  | $ | 155,191 |  |  | $ | 79 |  |  | $ | 808,148 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 272,040 |  |  | $ | — |  |  | $ | — |  |  | $ | 272,040 |
Field and Emergency Response Services |  | 105,168 |  |  | — |  |  | — |  |  | 105,168 |
Industrial Services and Other |  | 119,810 |  |  | — |  |  | 79 |  |  | 119,889 |
Safety-Kleen Environmental Services |  | 155,860 |  |  | 38,978 |  |  | — |  |  | 194,838 |
Safety-Kleen Oil |  | — |  |  | 116,213 |  |  | — |  |  | 116,213 |
Total third-party revenues |  | $ | 652,878 |  |  | $ | 155,191 |  |  | $ | 79 |  |  | $ | 808,148 |
|  | For the Three Months Ended March 31, 2020
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 607,110 |  |  | $ | 139,437 |  |  | $ | (302) |  |  | $ | 746,245 |
Canada |  | 97,926 |  |  | 14,000 |  |  | 392 |  |  | 112,318 |
Total third-party revenues |  | $ | 705,036 |  |  | $ | 153,437 |  |  | $ | 90 |  |  | $ | 858,563 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 275,273 |  |  | $ | — |  |  | $ | — |  |  | $ | 275,273 |
Field and Emergency Response Services |  | 105,912 |  |  | — |  |  | — |  |  | 105,912 |
Industrial Services and Other |  | 146,919 |  |  | — |  |  | 90 |  |  | 147,009 |
Safety-Kleen Environmental Services |  | 176,932 |  |  | 37,549 |  |  | — |  |  | 214,481 |
Safety-Kleen Oil |  | — |  |  | 115,888 |  |  | — |  |  | 115,888 |
Total third-party revenues |  | $ | 705,036 |  |  | $ | 153,437 |  |  | $ | 90 |  |  | $ | 858,563 |
Schedule of Contract Balances |
(in thousands) |  | March 31, 2021 |  | December 31, 2020
Receivables |  | $ | 620,184 |  |  | $ | 611,534 |
Contract assets (unbilled receivables) |  | 55,239 |  |  | 55,681 |
Contract liabilities (deferred revenue) |  | 83,165 |  |  | 74,066 |

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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=121604090&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=121604090&loc=SL49130545-203045 + Details
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- References No definition available. + Details
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