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REVENUES (Tables) | 12 Months Ended
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Dec. 31, 2018
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 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 |
Kleen Performance Products |  | — |  |  | 500,278 |  |  | — |  |  | 500,278 |
Total third party revenues |  | $ | 2,003,843 |  |  | $ | 1,295,355 |  |  | $ | 1,105 |  |  | $ | 3,300,303 |
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1. | All revenue except oil and oil product sales within Kleen Performance Products 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. Kleen Performance Products and Safety-Kleen Environmental Services product sales are recognized at a point in time.
Contract Balances | Contract Balances
|  | December 31, 2018 |  | December 31, 2017
Receivables |  | $ | 606,952 |  |  | $ | 528,924 |
Contract Assets (Unbilled Receivables) |  | 54,794 |  |  | 35,922 |
Contract Liabilities (Deferred Revenue) |  | 61,843 |  |  | 67,822 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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