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REVENUES (Tables) | 9 Months Ended
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Sep. 30, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents the Company’s revenues disaggregated by revenue source (in thousands):
|  | 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 |
Kleen Performance Products |  | — |  |  | 133,220 |  |  | — |  |  | 133,220 |
Total third party revenues |  | $ | 508,813 |  |  | $ | 333,901 |  |  | $ | 467 |  |  | $ | 843,181 |
|  | For the Three Months Ended September 30, 2017
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 334,625 |  |  | $ | 290,653 |  |  | $ | 468 |  |  | $ | 625,746 |
Canada |  | 105,538 |  |  | 24,375 |  |  | 187 |  |  | 130,100 |
Total third party revenues |  | $ | 440,163 |  |  | $ | 315,028 |  |  | $ | 655 |  |  | $ | 755,846 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 246,323 |  |  | $ | — |  |  | $ | — |  |  | $ | 246,323 |
Field and Emergency Response Services |  | 76,446 |  |  | — |  |  | — |  |  | 76,446 |
Industrial Services |  | 90,894 |  |  | — |  |  | — |  |  | 90,894 |
Oil, Gas and Lodging Services and Other |  | 26,500 |  |  | — |  |  | 655 |  |  | 27,155 |
Safety-Kleen Environmental Services |  | — |  |  | 191,420 |  |  | — |  |  | 191,420 |
Kleen Performance Products |  | — |  |  | 123,608 |  |  | — |  |  | 123,608 |
Total third party revenues |  | $ | 440,163 |  |  | $ | 315,028 |  |  | $ | 655 |  |  | $ | 755,846 |
|  | 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 |
Kleen Performance Products |  | — |  |  | 377,658 |  |  | — |  |  | 377,658 |
Total third party revenues |  | $ | 1,468,417 |  |  | $ | 972,534 |  |  | $ | 1,148 |  |  | $ | 2,442,099 |
|  | For the Nine Months Ended September 30, 2017
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 991,731 |  |  | $ | 843,341 |  |  | $ | 756 |  |  | $ | 1,835,828 |
Canada |  | 293,970 |  |  | 67,544 |  |  | 233 |  |  | 361,747 |
Total third party revenues |  | $ | 1,285,701 |  |  | $ | 910,885 |  |  | $ | 989 |  |  | $ | 2,197,575 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 731,028 |  |  | $ | — |  |  | $ | — |  |  | $ | 731,028 |
Field and Emergency Response Services |  | 208,172 |  |  | — |  |  | — |  |  | 208,172 |
Industrial Services |  | 265,695 |  |  | — |  |  | — |  |  | 265,695 |
Oil, Gas and Lodging Services and Other |  | 80,806 |  |  | — |  |  | 989 |  |  | 81,795 |
Safety-Kleen Environmental Services |  | — |  |  | 575,964 |  |  | — |  |  | 575,964 |
Kleen Performance Products |  | — |  |  | 334,921 |  |  | — |  |  | 334,921 |
Total third party revenues |  | $ | 1,285,701 |  |  | $ | 910,885 |  |  | $ | 989 |  |  | $ | 2,197,575 |
______________________
1. | All revenue except Kleen Performance Products and product sales within Safety-Kleen Environmental Services, which includes allied products and direct blended oil sales, are recognized over time. Kleen Performance Products and Safety-Kleen Environmental Services product sales are recognized at a point in time.
Contract Balances | Contract Balances
|  | September 30, 2018 |  | December 31, 2017 |  | September 30, 2017 |  | December 31, 2016
Receivables |  | $ | 608,645 |  |  | $ | 528,924 |  |  | $ | 531,696 |  |  | $ | 496,226 |
Contract Assets (Unbilled Receivables) |  | 63,964 |  |  | 35,922 |  |  | 40,933 |  |  | 36,190 |
Contract Liabilities (Deferred Revenue) |  | 65,172 |  |  | 67,822 |  |  | 69,236 |  |  | 64,397 |

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