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REVENUES (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Schedule of 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, 2020
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,690,256 |  |  | $ | 1,049,975 |  |  | $ | (674) |  |  | $ | 2,739,557 |
Canada |  | 313,825 |  |  | 89,751 |  |  | 964 |  |  | 404,540 |
Total third-party revenues |  | $ | 2,004,081 |  |  | $ | 1,139,726 |  |  | $ | 290 |  |  | $ | 3,144,097 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,062,714 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,062,714 |
Field and Emergency Response Services |  | 461,036 |  |  | — |  |  | — |  |  | 461,036 |
Industrial Services and Other |  | 480,331 |  |  | — |  |  | 290 |  |  | 480,621 |
Safety-Kleen Environmental Services |  | — |  |  | 809,236 |  |  | — |  |  | 809,236 |
Safety-Kleen Oil |  | — |  |  | 330,490 |  |  | — |  |  | 330,490 |
Total third-party revenues |  | $ | 2,004,081 |  |  | $ | 1,139,726 |  |  | $ | 290 |  |  | $ | 3,144,097 |
|  | 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 and Other (2) |  | 631,414 |  |  | — |  |  | 1,136 |  |  | 632,550 |
Safety-Kleen Environmental Services |  | — |  |  | 851,520 |  |  | — |  |  | 851,520 |
Safety-Kleen Oil |  | — |  |  | 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 and Other (3) |  | 661,728 |  |  | — |  |  | 1,105 |  |  | 662,833 |
Safety-Kleen Environmental Services |  | — |  |  | 795,077 |  |  | — |  |  | 795,077 |
Safety-Kleen Oil |  | — |  |  | 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)Environmental Services third-party revenues of $117.0 million and Corporate third party revenues of $1.1 million previously reported as Oil, Gas and Lodging Services and Other for the year ended December 31, 2019 are now reported within Industrial Services and Other based on relative materiality to the business. (3)Environmental Services third-party revenues of $119.8 million and Corporate third party revenues of $1.1 million previously reported as Oil, Gas and Lodging Services and Other for the year ended December 31, 2018 are now reported within Industrial Services and Other based on relative materiality to the business.
Schedule of Contract Balances | Contract Balances
(in thousands) |  | December 31, 2020 |  | December 31, 2019 |  |
Receivables |  | $ | 611,534 |  |  | $ | 644,738 |  |  |
Contract assets (unbilled receivables) |  | 55,681 |  |  | 56,326 |  |  |
Contract liabilities (deferred revenue) |  | 74,066 |  |  | 73,370 |  |  |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + 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=121604090&loc=SL49130551-203045 + Details
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