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SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ 120,691 | $ 110,445 | $ 200,826 | $ 177,765
Reconciliation to Consolidated Statements of Operations: |  |  |  |
Accretion of environmental liabilities | 2,416 | 2,548 | 4,706 | 5,053
Depreciation and amortization | 71,531 | 73,393 | 143,943 | 142,295
Income from operations | 46,744 | 34,504 | 52,177 | 30,417
Other expense | 833 | 189 | 2,382 | 539
Loss on early extinguishment of debt | 6,045 | 0 | 6,045 | 0
Gain on sale of business | (31,722) | 0 | (31,722) | 0
Interest expense, net of interest income | 22,492 | 21,647 | 45,068 | 40,627
Income (loss) before (benefit) provision for income taxes | 49,096 | 12,668 | 30,404 | (10,749)
Technical Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 73,080 | 68,891 | 131,567 | 129,289
Industrial and Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 21,484 | 19,960 | 23,397 | 20,393
Safety-Kleen |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 60,281 | 55,234 | 112,649 | 95,289
Oil, Gas and Lodging Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 268 | (1,199) | 58 | 111
Corporate Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ (34,422) | $ (32,441) | $ (66,845) | $ (67,317)

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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 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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