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REVENUES (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
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 year ended December 31, 2019
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,721,322 |  |  | $ | 1,220,096 |  |  | $ | (586 | ) |  | $ | 2,940,832 |
Canada |  | 371,041 |  |  | 98,595 |  |  | 1,722 |  |  | 471,358 |
Total third party revenues |  | $ | 2,092,363 |  |  | $ | 1,318,691 |  |  | $ | 1,136 |  |  | $ | 3,412,190 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,120,043 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,120,043 |
Field and Emergency Response Services |  | 340,906 |  |  | — |  |  | — |  |  | 340,906 |
Industrial Services |  | 514,390 |  |  | — |  |  | — |  |  | 514,390 |
Oil, Gas and Lodging Services and Other |  | 117,024 |  |  | — |  |  | 1,136 |  |  | 118,160 |
Safety-Kleen Environmental Services |  | — |  |  | 851,520 |  |  | — |  |  | 851,520 |
Safety-Kleen Oil (2) |  | — |  |  | 467,171 |  |  | — |  |  | 467,171 |
Total third party revenues |  | $ | 2,092,363 |  |  | $ | 1,318,691 |  |  | $ | 1,136 |  |  | $ | 3,412,190 |
|  | For the year ended December 31, 2018
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,598,402 |  |  | $ | 1,196,661 |  |  | $ | 1,082 |  |  | $ | 2,796,145 |
Canada |  | 405,441 |  |  | 98,694 |  |  | 23 |  |  | 504,158 |
Total third party revenues |  | $ | 2,003,843 |  |  | $ | 1,295,355 |  |  | $ | 1,105 |  |  | $ | 3,300,303 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,037,388 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,037,388 |
Field and Emergency Response Services |  | 304,727 |  |  | — |  |  | — |  |  | 304,727 |
Industrial Services |  | 541,895 |  |  | — |  |  | — |  |  | 541,895 |
Oil, Gas and Lodging Services and Other |  | 119,833 |  |  | — |  |  | 1,105 |  |  | 120,938 |
Safety-Kleen Environmental Services |  | — |  |  | 795,077 |  |  | — |  |  | 795,077 |
Safety-Kleen Oil (2) |  | — |  |  | 500,278 |  |  | — |  |  | 500,278 |
Total third party revenues |  | $ | 2,003,843 |  |  | $ | 1,295,355 |  |  | $ | 1,105 |  |  | $ | 3,300,303 |
_____________________
(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) |  | December 31, 2019 |  | December 31, 2018
Receivables |  | $ | 644,738 |  |  | $ | 606,952 |
Contract assets (unbilled receivables) |  | 56,326 |  |  | 54,794 |
Contract liabilities (deferred revenue) |  | 73,370 |  |  | 61,843 |

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