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REVENUES (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents our revenues disaggregated by revenue source (in thousands):
|  | Three Months Ended March 31, 2018
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 343,972 |  |  | $ | 287,642 |  |  | $ | 145 |  |  | $ | 631,759 |
Canada |  | 95,716 |  |  | 22,276 |  |  | 27 |  |  | 118,019 |
|  | 439,688 |  |  | 309,918 |  |  | 172 |  |  | 749,778 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | 236,306 |  |  | — |  |  | — |  |  | 236,306 |
Field and Emergency Response Services |  | 69,935 |  |  | — |  |  | — |  |  | 69,935 |
Industrial Services |  | 103,763 |  |  | — |  |  | — |  |  | 103,763 |
Oil, Gas and Lodging Services and Other |  | 29,684 |  |  | — |  |  | 172 |  |  | 29,856 |
Safety-Kleen Environmental Services |  | — |  |  | 194,161 |  |  | — |  |  | 194,161 |
Kleen Performance Products |  | — |  |  | 115,757 |  |  | — |  |  | 115,757 |
Total third party revenues |  | $ | 439,688 |  |  | $ | 309,918 |  |  | $ | 172 |  |  | $ | 749,778 |
|  | Three Months Ended March 31, 2017
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 313,783 |  |  | $ | 272,071 |  |  | $ | 133 |  |  | $ | 585,987 |
Canada |  | 82,124 |  |  | 20,830 |  |  | — |  |  | 102,954 |
|  | 395,907 |  |  | 292,901 |  |  | 133 |  |  | 688,941 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | 230,218 |  |  | — |  |  | — |  |  | 230,218 |
Field and Emergency Response Services |  | 61,019 |  |  | — |  |  | — |  |  | 61,019 |
Industrial Services |  | 75,068 |  |  | — |  |  | — |  |  | 75,068 |
Oil, Gas and Lodging Services and Other |  | 29,602 |  |  | — |  |  | 133 |  |  | 29,735 |
Safety-Kleen Environmental Services |  | — |  |  | 191,727 |  |  | — |  |  | 191,727 |
Kleen Performance Products |  | — |  |  | 101,174 |  |  | — |  |  | 101,174 |
Total third party revenues |  | $ | 395,907 |  |  | $ | 292,901 |  |  | $ | 133 |  |  | $ | 688,941 |
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1. | All revenue except Kleen Performance Products and product sales within Safety-Kleen Environmental Services, including allied products and direct blended oil sales, are recognized over time. Kleen Performance Products and Safety-Kleen Environmental Services product revenues are recognized at a point in time.
Contract Balances | Contract Balances
|  | March 31, 2018 |  | December 31, 2017 |  | March 31, 2017 |  | December 31, 2016
Receivables |  | $ | 551,841 |  |  | $ | 528,924 |  |  | $ | 480,044 |  |  | $ | 496,226 |
Contract Assets |  | 63,375 |  |  | 35,922 |  |  | 28,106 |  |  | 36,190 |
Contract Liabilities |  | 68,748 |  |  | 67,822 |  |  | 64,379 |  |  | 64,397 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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