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REVENUES (Tables) | 3 Months Ended
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Mar. 31, 2020
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 Three Months Ended March 31, 2020
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 440,014 |  |  | $ | 306,533 |  |  | $ | (302 | ) |  | $ | 746,245 |
Canada |  | 88,090 |  |  | 23,836 |  |  | 392 |  |  | 112,318 |
Total third-party revenues |  | $ | 528,104 |  |  | $ | 330,369 |  |  | $ | 90 |  |  | $ | 858,563 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 275,273 |  |  | $ | — |  |  | $ | — |  |  | $ | 275,273 |
Field and Emergency Response Services |  | 105,912 |  |  | — |  |  | — |  |  | 105,912 |
Industrial Services and Other |  | 146,919 |  |  | — |  |  | 90 |  |  | 147,009 |
Safety-Kleen Environmental Services |  | — |  |  | 214,481 |  |  | — |  |  | 214,481 |
Safety-Kleen Oil |  | — |  |  | 115,888 |  |  | — |  |  | 115,888 |
Total third-party revenues |  | $ | 528,104 |  |  | $ | 330,369 |  |  | $ | 90 |  |  | $ | 858,563 |
|  | For the Three Months Ended March 31, 2019
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 388,169 |  |  | $ | 286,574 |  |  | $ | 594 |  |  | $ | 675,337 |
Canada |  | 85,529 |  |  | 19,973 |  |  | — |  |  | 105,502 |
Total third-party revenues |  | $ | 473,698 |  |  | $ | 306,547 |  |  | $ | 594 |  |  | $ | 780,839 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 251,919 |  |  | $ | — |  |  | $ | — |  |  | $ | 251,919 |
Field and Emergency Response Services |  | 71,626 |  |  | — |  |  | — |  |  | 71,626 |
Industrial Services and Other (2) |  | 150,153 |  |  | — |  |  | 594 |  |  | 150,747 |
Safety-Kleen Environmental Services |  | — |  |  | 207,083 |  |  | — |  |  | 207,083 |
Safety-Kleen Oil |  | — |  |  | 99,464 |  |  | — |  |  | 99,464 |
Total third-party revenues |  | $ | 473,698 |  |  | $ | 306,547 |  |  | $ | 594 |  |  | $ | 780,839 |
________________ (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) Third-party revenues of $34,055 and $594, respectively, previously reported as Oil, Gas and Lodging Services and Other for the three months ended March 31, 2019 are now disclosed within Industrial Services and Other based on relative materiality to the business.
Contract Balances |
(in thousands) |  | March 31, 2020 |  | December 31, 2019
Receivables |  | $ | 658,482 |  |  | $ | 644,738 |
Contract assets (unbilled receivables) |  | 51,215 |  |  | 56,326 |
Contract liabilities (deferred revenue) |  | 71,243 |  |  | 73,370 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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