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SEGMENT REPORTING (Segment Information, Revenues, EBITA, and Reconciliation to the Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 3,144,097 | $ 3,412,190 | $ 3,300,303
Adjusted EBITDA | 555,302 | 540,317 | 491,005
Reconciliation to Consolidated Statements of Operations: |  |  |
Accretion of environmental liabilities | 11,051 | 10,136 | 9,806
Depreciation and amortization | 292,915 | 300,725 | 298,625
Income from operations | 251,336 | 229,456 | 182,574
Other expense (income), net | 290 | (2,897) | 4,510
Loss on early extinguishment of debt | 0 | 6,131 | 2,488
Loss (gain) on sale of businesses | 3,376 | (687) | 0
Interest expense, net of interest income | 73,120 | 78,670 | 81,094
Income before provision for income taxes | 174,550 | 148,239 | 94,482
Property, plant and equipment, net | 1,525,298 | 1,588,151 |
Goodwill | 527,023 | 525,013 | 514,189
Permits and other intangibles, net | 386,620 | 419,066 |
Permits and other intangibles, net | 913,643 | 944,079 |
Environmental Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 2,137,306 | 2,237,068 | 2,141,194
Reconciliation to Consolidated Statements of Operations: |  |  |
Goodwill | 212,386 | 212,531 | 207,019
Safety-Kleen |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,010,202 | 1,178,129 | 1,161,282
Reconciliation to Consolidated Statements of Operations: |  |  |
Goodwill | 314,637 | 312,482 | 307,170
Operating segments | Environmental Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 2,004,081 | 2,092,363 | 2,003,843
Adjusted EBITDA | 519,960 | 446,284 | 380,856
Reconciliation to Consolidated Statements of Operations: |  |  |
Property, plant and equipment, net | 879,176 | 939,352 |
Goodwill | 212,386 | 212,531 |
Permits and other intangibles, net | 78,928 | 89,722 |
Permits and other intangibles, net | 291,314 | 302,253 |
Operating segments | Safety-Kleen |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,139,726 | 1,318,691 | 1,295,355
Adjusted EBITDA | 229,172 | 282,378 | 282,029
Reconciliation to Consolidated Statements of Operations: |  |  |
Property, plant and equipment, net | 555,894 | 555,310 |
Goodwill | 314,637 | 312,482 |
Permits and other intangibles, net | 307,692 | 329,344 |
Permits and other intangibles, net | 622,329 | 641,826 |
Intersegment revenues, net | Environmental Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 129,666 | 140,577 | 134,104
Intersegment revenues, net | Safety-Kleen |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (129,666) | (140,577) | (134,104)
Corporate Items, net |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (3,701) | (4,143) | (3,278)
Corporate Items, net | Environmental Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 3,559 | 4,128 | 3,247
Corporate Items, net | Safety-Kleen |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 142 | 15 | 31
Corporate Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 290 | 1,136 | 1,105
Adjusted EBITDA | (193,830) | (188,345) | (171,880)
Reconciliation to Consolidated Statements of Operations: |  |  |
Property, plant and equipment, net | 90,228 | 93,489 |
Operating segments and corporate non segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ (3,411) | $ (3,007) | $ (2,173)

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