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REVENUES (Tables) | 6 Months Ended
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Jun. 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 June 30, 2019
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 431,749 |  |  | $ | 316,688 |  |  | $ | 202 |  |  | $ | 748,639 |
Canada |  | 94,545 |  |  | 25,494 |  |  | — |  |  | 120,039 |
Total third-party revenues |  | $ | 526,294 |  |  | $ | 342,182 |  |  | $ | 202 |  |  | $ | 868,678 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 275,908 |  |  | $ | — |  |  | $ | — |  |  | $ | 275,908 |
Field and Emergency Response Services |  | 86,722 |  |  | — |  |  | — |  |  | 86,722 |
Industrial Services |  | 136,011 |  |  | — |  |  | — |  |  | 136,011 |
Oil, Gas and Lodging Services and Other |  | 27,653 |  |  | — |  |  | 202 |  |  | 27,855 |
Safety-Kleen Environmental Services |  | — |  |  | 216,434 |  |  | — |  |  | 216,434 |
Safety-Kleen Oil (2) |  | — |  |  | 125,748 |  |  | — |  |  | 125,748 |
Total third-party revenues |  | $ | 526,294 |  |  | $ | 342,182 |  |  | $ | 202 |  |  | $ | 868,678 |
|  | For the Three Months Ended June 30, 2018
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 408,127 |  |  | $ | 306,059 |  |  | $ | 363 |  |  | $ | 714,549 |
Canada |  | 111,789 |  |  | 22,656 |  |  | 146 |  |  | 134,591 |
Total third-party revenues |  | $ | 519,916 |  |  | $ | 328,715 |  |  | $ | 509 |  |  | $ | 849,140 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 257,006 |  |  | $ | — |  |  | $ | — |  |  | $ | 257,006 |
Field and Emergency Response Services |  | 76,092 |  |  | — |  |  | — |  |  | 76,092 |
Industrial Services |  | 161,046 |  |  | — |  |  | — |  |  | 161,046 |
Oil, Gas and Lodging Services and Other |  | 25,772 |  |  | — |  |  | 509 |  |  | 26,281 |
Safety-Kleen Environmental Services |  | — |  |  | 200,034 |  |  | — |  |  | 200,034 |
Safety-Kleen Oil (2) |  | — |  |  | 128,681 |  |  | — |  |  | 128,681 |
Total third-party revenues |  | $ | 519,916 |  |  | $ | 328,715 |  |  | $ | 509 |  |  | $ | 849,140 |
|  | For the Six Months Ended June 30, 2019
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 819,918 |  |  | $ | 603,262 |  |  | $ | 796 |  |  | $ | 1,423,976 |
Canada |  | 180,074 |  |  | 45,467 |  |  | — |  |  | 225,541 |
Total third-party revenues |  | $ | 999,992 |  |  | $ | 648,729 |  |  | $ | 796 |  |  | $ | 1,649,517 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 527,827 |  |  | $ | — |  |  | $ | — |  |  | $ | 527,827 |
Field and Emergency Response Services |  | 158,348 |  |  | — |  |  | — |  |  | 158,348 |
Industrial Services |  | 252,109 |  |  | — |  |  | — |  |  | 252,109 |
Oil, Gas and Lodging Services and Other |  | 61,708 |  |  | — |  |  | 796 |  |  | 62,504 |
Safety-Kleen Environmental Services |  | — |  |  | 423,517 |  |  | — |  |  | 423,517 |
Safety-Kleen Oil (2) |  | — |  |  | 225,212 |  |  | — |  |  | 225,212 |
Total third-party revenues |  | $ | 999,992 |  |  | $ | 648,729 |  |  | $ | 796 |  |  | $ | 1,649,517 |
|  | For the Six Months Ended June 30, 2018
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 752,099 |  |  | $ | 593,701 |  |  | $ | 508 |  |  | $ | 1,346,308 |
Canada |  | 207,505 |  |  | 44,932 |  |  | 173 |  |  | 252,610 |
Total third-party revenues |  | $ | 959,604 |  |  | $ | 638,633 |  |  | $ | 681 |  |  | $ | 1,598,918 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 493,312 |  |  | $ | — |  |  | $ | — |  |  | $ | 493,312 |
Field and Emergency Response Services |  | 146,027 |  |  | — |  |  | — |  |  | 146,027 |
Industrial Services |  | 264,809 |  |  | — |  |  | — |  |  | 264,809 |
Oil, Gas and Lodging Services and Other |  | 55,456 |  |  | — |  |  | 681 |  |  | 56,137 |
Safety-Kleen Environmental Services |  | — |  |  | 394,195 |  |  | — |  |  | 394,195 |
Safety-Kleen Oil (2) |  | — |  |  | 244,438 |  |  | — |  |  | 244,438 |
Total third-party revenues |  | $ | 959,604 |  |  | $ | 638,633 |  |  | $ | 681 |  |  | $ | 1,598,918 |
______________________
(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
|  | June 30, 2019 |  | December 31, 2018
Receivables |  | $ | 632,888 |  |  | $ | 606,952 |
Contract assets (unbilled receivables) |  | 52,174 |  |  | 54,794 |
Contract liabilities (deferred revenue) |  | 75,170 |  |  | 61,843 |

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