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REVENUES (Tables) | 9 Months Ended
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Sep. 30, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents the Company’s third-party revenues disaggregated by revenue source (in thousands):
|  | 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 |  | 131,855 |  |  | — |  |  | — |  |  | 131,855 |
Oil, Gas and Lodging Services and Other |  | 30,215 |  |  | — |  |  | 129 |  |  | 30,344 |
Safety-Kleen Environmental Services |  | — |  |  | 217,439 |  |  | — |  |  | 217,439 |
Safety-Kleen Oil (2) |  | — |  |  | 123,978 |  |  | — |  |  | 123,978 |
Total third-party revenues |  | $ | 550,122 |  |  | $ | 341,417 |  |  | $ | 129 |  |  | $ | 891,668 |
|  | For the Three Months Ended September 30, 2018
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 410,792 |  |  | $ | 307,497 |  |  | $ | (66 | ) |  | $ | 718,223 |
Canada |  | 98,021 |  |  | 26,404 |  |  | 533 |  |  | 124,958 |
Total third-party revenues |  | $ | 508,813 |  |  | $ | 333,901 |  |  | $ | 467 |  |  | $ | 843,181 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 264,769 |  |  | $ | — |  |  | $ | — |  |  | $ | 264,769 |
Field and Emergency Response Services |  | 77,025 |  |  | — |  |  | — |  |  | 77,025 |
Industrial Services |  | 134,323 |  |  | — |  |  | — |  |  | 134,323 |
Oil, Gas and Lodging Services and Other |  | 32,696 |  |  | — |  |  | 467 |  |  | 33,163 |
Safety-Kleen Environmental Services |  | — |  |  | 200,681 |  |  | — |  |  | 200,681 |
Safety-Kleen Oil (2) |  | — |  |  | 133,220 |  |  | — |  |  | 133,220 |
Total third-party revenues |  | $ | 508,813 |  |  | $ | 333,901 |  |  | $ | 467 |  |  | $ | 843,181 |
|  | 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 |  | 383,964 |  |  | — |  |  | — |  |  | 383,964 |
Oil, Gas and Lodging Services and Other |  | 91,923 |  |  | — |  |  | 925 |  |  | 92,848 |
Safety-Kleen Environmental Services |  | — |  |  | 640,956 |  |  | — |  |  | 640,956 |
Safety-Kleen Oil (2) |  | — |  |  | 349,190 |  |  | — |  |  | 349,190 |
Total third-party revenues |  | $ | 1,550,114 |  |  | $ | 990,146 |  |  | $ | 925 |  |  | $ | 2,541,185 |
|  | For the Nine Months Ended September 30, 2018
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,162,891 |  |  | $ | 901,198 |  |  | $ | 442 |  |  | $ | 2,064,531 |
Canada |  | 305,526 |  |  | 71,336 |  |  | 706 |  |  | 377,568 |
Total third-party revenues |  | $ | 1,468,417 |  |  | $ | 972,534 |  |  | $ | 1,148 |  |  | $ | 2,442,099 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 758,081 |  |  | $ | — |  |  | $ | — |  |  | $ | 758,081 |
Field and Emergency Response Services |  | 223,052 |  |  | — |  |  | — |  |  | 223,052 |
Industrial Services |  | 399,132 |  |  | — |  |  | — |  |  | 399,132 |
Oil, Gas and Lodging Services and Other |  | 88,152 |  |  | — |  |  | 1,148 |  |  | 89,300 |
Safety-Kleen Environmental Services |  | — |  |  | 594,876 |  |  | — |  |  | 594,876 |
Safety-Kleen Oil (2) |  | — |  |  | 377,658 |  |  | — |  |  | 377,658 |
Total third-party revenues |  | $ | 1,468,417 |  |  | $ | 972,534 |  |  | $ | 1,148 |  |  | $ | 2,442,099 |
______________________
(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) | Safety-Kleen Oil was formerly known as Kleen Performance Products.
Contract Balances | Contract Balances
(in thousands) |  | September 30, 2019 |  | December 31, 2018
Receivables |  | $ | 641,667 |  |  | $ | 606,952 |
Contract assets (unbilled receivables) |  | 58,842 |  |  | 54,794 |
Contract liabilities (deferred revenue) |  | 73,157 |  |  | 61,843 |

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