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SEGMENT REPORTING - Adjusted EBITDA Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ 149,825 | $ 139,561 | $ 251,488 | $ 227,826
Reconciliation to Consolidated Statements of Operations: |  |  |  |
Accretion of environmental liabilities | 2,560 | 2,448 | 5,134 | 4,878
Depreciation and amortization | 74,217 | 72,760 | 149,572 | 147,604
Income from operations | 73,048 | 64,353 | 96,782 | 75,344
Other expense (income), net | 564 | (846) | (2,419) | (547)
Interest expense, net of interest income | 20,215 | 20,769 | 39,979 | 41,039
Income before provision for income taxes | 52,269 | 44,430 | 59,222 | 34,852
Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 117,868 | 109,199 | 207,378 | 170,616
Safety-Kleen |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 79,459 | 73,069 | 134,252 | 134,953
Corporate Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ (47,502) | $ (42,707) | $ (90,142) | $ (77,743)

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- Definition This element represents the income or loss from continuing operations before interest, taxes, depreciation and amortization to the economic entity. + References No definition available. + Details
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- Definition Reconciliation Between Adjusted EBITDA and Income Statement [Abstract] + References No definition available. + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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