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REVENUES (Tables) | 9 Months Ended
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Sep. 30, 2020
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 September 30, 2020
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 409,787 |  |  | $ | 257,048 |  |  | $ | (186) |  |  | $ | 666,649 |
Canada |  | 88,396 |  |  | 24,041 |  |  | 258 |  |  | 112,695 |
Total third-party revenues |  | $ | 498,183 |  |  | $ | 281,089 |  |  | $ | 72 |  |  | $ | 779,344 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 257,612 |  |  | $ | — |  |  | $ | — |  |  | $ | 257,612 |
Field and Emergency Response Services |  | 115,989 |  |  | — |  |  | — |  |  | 115,989 |
Industrial Services and Other |  | 124,582 |  |  | — |  |  | 72 |  |  | 124,654 |
Safety-Kleen Environmental Services |  | — |  |  | 203,455 |  |  | — |  |  | 203,455 |
Safety-Kleen Oil |  | — |  |  | 77,634 |  |  | — |  |  | 77,634 |
Total third-party revenues |  | $ | 498,183 |  |  | $ | 281,089 |  |  | $ | 72 |  |  | $ | 779,344 |
|  | For the Three Months Ended September 30, 2019
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 450,638 |  |  | $ | 313,979 |  |  | $ | (265) |  |  | $ | 764,352 |
Canada |  | 99,484 |  |  | 27,438 |  |  | 394 |  |  | 127,316 |
Total third-party revenues |  | $ | 550,122 |  |  | $ | 341,417 |  |  | $ | 129 |  |  | $ | 891,668 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 292,506 |  |  | $ | — |  |  | $ | — |  |  | $ | 292,506 |
Field and Emergency Response Services |  | 95,546 |  |  | — |  |  | — |  |  | 95,546 |
Industrial Services and Other (2) |  | 162,070 |  |  | — |  |  | 129 |  |  | 162,199 |
Safety-Kleen Environmental Services |  | — |  |  | 217,439 |  |  | — |  |  | 217,439 |
Safety-Kleen Oil |  | — |  |  | 123,978 |  |  | — |  |  | 123,978 |
Total third-party revenues |  | $ | 550,122 |  |  | $ | 341,417 |  |  | $ | 129 |  |  | $ | 891,668 |
|  | For the Nine Months Ended September 30, 2020
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,253,252 |  |  | $ | 791,919 |  |  | $ | (648) |  |  | $ | 2,044,523 |
Canada |  | 237,389 |  |  | 65,129 |  |  | 866 |  |  | 303,384 |
Total third-party revenues |  | $ | 1,490,641 |  |  | $ | 857,048 |  |  | $ | 218 |  |  | $ | 2,347,907 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 774,814 |  |  | $ | — |  |  | $ | — |  |  | $ | 774,814 |
Field and Emergency Response Services |  | 349,254 |  |  | — |  |  | — |  |  | 349,254 |
Industrial Services and Other |  | 366,573 |  |  | — |  |  | 218 |  |  | 366,791 |
Safety-Kleen Environmental Services |  | — |  |  | 612,808 |  |  | — |  |  | 612,808 |
Safety-Kleen Oil |  | — |  |  | 244,240 |  |  | — |  |  | 244,240 |
Total third-party revenues |  | $ | 1,490,641 |  |  | $ | 857,048 |  |  | $ | 218 |  |  | $ | 2,347,907 |
|  | For the Nine Months Ended September 30, 2019
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,270,556 |  |  | $ | 917,240 |  |  | $ | 531 |  |  | $ | 2,188,327 |
Canada |  | 279,558 |  |  | 72,906 |  |  | 394 |  |  | 352,858 |
Total third-party revenues |  | $ | 1,550,114 |  |  | $ | 990,146 |  |  | $ | 925 |  |  | $ | 2,541,185 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 820,333 |  |  | $ | — |  |  | $ | — |  |  | $ | 820,333 |
Field and Emergency Response Services |  | 253,894 |  |  | — |  |  | — |  |  | 253,894 |
Industrial Services and Other (2) |  | 475,887 |  |  | — |  |  | 925 |  |  | 476,812 |
Safety-Kleen Environmental Services |  | — |  |  | 640,956 |  |  | — |  |  | 640,956 |
Safety-Kleen Oil |  | — |  |  | 349,190 |  |  | — |  |  | 349,190 |
Total third-party revenues |  | $ | 1,550,114 |  |  | $ | 990,146 |  |  | $ | 925 |  |  | $ | 2,541,185 |
________________ (1) All revenue except oil and oil product sales within Safety-Kleen Oil and product sales within Safety-Kleen Environmental Services, which include various automotive related fluids, shop supplies and direct blended oil sales, are recognized over time. Safety-Kleen Oil and Safety-Kleen Environmental Services product sales are recognized at a point in time. (2) Third-party revenues previously reported as Oil, Gas and Lodging Services of $30.2 million and Other of $0.1 million for the three months ended September 30, 2019, respectively, and $91.9 million and $0.9 million, respectively for the nine months ended September 30, 2019, are now disclosed within Industrial Services and Other based on relative materiality to the business.
Schedule of Contract Balances |
(in thousands) |  | September 30, 2020 |  | December 31, 2019
Receivables |  | $ | 602,069 |  |  | $ | 644,738 |
Contract assets (unbilled receivables) |  | 59,438 |  |  | 56,326 |
Contract liabilities (deferred revenue) |  | 67,412 |  |  | 73,370 |

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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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