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REVENUES (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following tables present the Company's third-party revenue disaggregated by source of revenue and geography (in thousands):
|  | For the year ended December 31, 2021
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 2,631,112 |  |  | $ | 693,542 |  |  | $ | 299 |  |  | $ | 3,324,953 |
Canada |  | 394,795 |  |  | 85,818 |  |  | — |  |  | 480,613 |
Total third-party revenues |  | $ | 3,025,907 |  |  | $ | 779,360 |  |  | $ | 299 |  |  | $ | 3,805,566 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,209,624 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,209,624 |
Field and Emergency Response Services (1) |  | 466,380 |  |  | — |  |  | — |  |  | 466,380 |
Industrial Services and Other (2) |  | 705,999 |  |  | — |  |  | 299 |  |  | 706,298 |
Safety-Kleen Environmental Services |  | 643,904 |  |  | 161,587 |  |  | — |  |  | 805,491 |
Safety-Kleen Oil |  | — |  |  | 617,773 |  |  | — |  |  | 617,773 |
Total third-party revenues |  | $ | 3,025,907 |  |  | $ | 779,360 |  |  | $ | 299 |  |  | $ | 3,805,566 |
_____________ (1) Includes $28.4 million of third-party revenues generated from the operations of the HydroChemPSC business (2) Includes $137.7 million of third-party revenues generated from the operations of the HydroChemPSC business
|  | For the year ended December 31, 2020
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 2,287,796 |  |  | $ | 452,435 |  |  | $ | (674) |  |  | $ | 2,739,557 |
Canada |  | 349,845 |  |  | 53,731 |  |  | 964 |  |  | 404,540 |
Total third-party revenues |  | $ | 2,637,641 |  |  | $ | 506,166 |  |  | $ | 290 |  |  | $ | 3,144,097 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,062,714 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,062,714 |
Field and Emergency Response Services |  | 461,036 |  |  | — |  |  | — |  |  | 461,036 |
Industrial Services and Other |  | 480,331 |  |  | — |  |  | 290 |  |  | 480,621 |
Safety-Kleen Environmental Services |  | 633,560 |  |  | 175,676 |  |  | — |  |  | 809,236 |
Safety-Kleen Oil |  | — |  |  | 330,490 |  |  | — |  |  | 330,490 |
Total third-party revenues |  | $ | 2,637,641 |  |  | $ | 506,166 |  |  | $ | 290 |  |  | $ | 3,144,097 |
|  | For the year ended December 31, 2019
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 2,390,718 |  |  | $ | 550,700 |  |  | $ | (586) |  |  | $ | 2,940,832 |
Canada |  | 411,964 |  |  | 57,672 |  |  | 1,722 |  |  | 471,358 |
Total third-party revenues |  | $ | 2,802,682 |  |  | $ | 608,372 |  |  | $ | 1,136 |  |  | $ | 3,412,190 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,120,043 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,120,043 |
Field and Emergency Response Services |  | 340,906 |  |  | — |  |  | — |  |  | 340,906 |
Industrial Services and Other |  | 631,414 |  |  | — |  |  | 1,136 |  |  | 632,550 |
Safety-Kleen Environmental Services |  | 710,319 |  |  | 141,201 |  |  | — |  |  | 851,520 |
Safety-Kleen Oil |  | — |  |  | 467,171 |  |  | — |  |  | 467,171 |
Total third-party revenues |  | $ | 2,802,682 |  |  | $ | 608,372 |  |  | $ | 1,136 |  |  | $ | 3,412,190 |
Schedule of Contract Balances | Contract Balances
(in thousands) |  | December 31, 2021 |  | December 31, 2020 |  |
Receivables |  | $ | 792,734 |  |  | $ | 611,534 |  |  |
Contract assets (unbilled receivables) |  | 94,963 |  |  | 55,681 |  |  |
Contract liabilities (deferred revenue) |  | 83,749 |  |  | 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=123351226&loc=SL49130551-203045 + Details
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