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SEGMENT REPORTING (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Reconciliation of Third Party Revenues to Direct Revenues | The following table reconciles third-party revenues to direct revenues for the years ended December 31, 2018, 2017 and 2016 (in thousands):
| For the Year Ended December 31, 2018
| Environmental Services |  | Safety-Kleen |  | Corporate Items |  | Totals
Third-party revenues | $ | 2,003,843 |  |  | $ | 1,295,355 |  |  | $ | 1,105 |  |  | $ | 3,300,303 |
Intersegment revenues, net | 134,104 |  |  | (134,104 | ) |  | — |  |  | — |
Corporate Items, net | 3,247 |  |  | 31 |  |  | (3,278 | ) |  | — |
Direct revenues | $ | 2,141,194 |  |  | $ | 1,161,282 |  |  | $ | (2,173 | ) |  | $ | 3,300,303 |
| For the Year Ended December 31, 2017
| Environmental Services |  | Safety-Kleen |  | Corporate Items |  | Totals
Third-party revenues | $ | 1,728,700 |  |  | $ | 1,213,703 |  |  | $ | 2,575 |  |  | $ | 2,944,978 |
Intersegment revenues, net | 125,822 |  |  | (125,822 | ) |  | — |  |  | — |
Corporate Items, net | 2,952 |  |  | 5 |  |  | (2,957 | ) |  | — |
Direct revenues | $ | 1,857,474 |  |  | $ | 1,087,886 |  |  | $ | (382 | ) |  | $ | 2,944,978 |
| For the Year Ended December 31, 2016
| Environmental Services |  | Safety-Kleen |  | Corporate Items |  | Totals
Third-party revenues | $ | 1,641,432 |  |  | $ | 1,110,727 |  |  | $ | 3,067 |  |  | $ | 2,755,226 |
Intersegment revenues, net | 115,013 |  |  | (115,013 | ) |  | — |  |  | — |
Corporate Items, net | 2,388 |  |  | 369 |  |  | (2,757 | ) |  | — |
Direct revenues | $ | 1,758,833 |  |  | $ | 996,083 |  |  | $ | 310 |  |  | $ | 2,755,226 |
Reconciliation to Consolidated Statements of Income to Adjusted EBITDA | The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Adjusted EBITDA: |  |  |  |  |
Environmental Services | $ | 380,856 |  |  | $ | 321,310 |  |  | $ | 319,075 |
Safety-Kleen | 282,029 |  |  | 249,811 |  |  | 219,546 |
Corporate Items | (171,880 | ) |  | (145,464 | ) |  | (138,267 | )
Total | 491,005 |  |  | 425,657 |  |  | 400,354 |
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |
Accretion of environmental liabilities | 9,806 |  |  | 9,460 |  |  | 10,177 |
Depreciation and amortization | 298,625 |  |  | 288,422 |  |  | 287,002 |
Goodwill impairment charge | — |  |  | — |  |  | 34,013 |
Income from operations | 182,574 |  |  | 127,775 |  |  | 69,162 |
Other expense (income), net | 4,510 |  |  | 6,119 |  |  | (6,195 | )
Loss on early extinguishment of debt | 2,488 |  |  | 7,891 |  |  | — |
Gain on sale of businesses | — |  |  | (30,732 | ) |  | (16,884 | )
Interest expense, net of interest income | 81,094 |  |  | 85,808 |  |  | 83,525 |
Income from operations before provision (benefit) for income taxes | $ | 94,482 |  |  | $ | 58,689 |  |  | $ | 8,716 |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] | For the years ended December 31, 2018, 2017, and 2016, the Company generated direct revenues in the following geographic locations (in thousands):
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| Revenue |  | % of Total |  | Revenue |  | % of Total |  | Revenue |  | % of Total
United States | $ | 2,721,814 |  |  | 82.5 | % |  | $ | 2,392,000 |  |  | 81.2 | % |  | $ | 2,213,355 |  |  | 80.3 | %
Canada | 578,489 |  |  | 17.5 | % |  | 552,978 |  |  | 18.8 | % |  | 541,871 |  |  | 19.7 | %
Total Revenues | $ | 3,300,303 |  |  | 100.0 | % |  | $ | 2,944,978 |  |  | 100.0 | % |  | $ | 2,755,226 |  |  | 100.0 | %
As of December 31, 2018 and 2017, the Company had property, plant and equipment, net of depreciation and amortization and permits and other intangible assets in the following geographic locations (in thousands):
| For the Year Ended December 31,
| 2018 |  | 2017
| Total |  | % of Total |  | Total |  | % of Total
Property, plant and equipment, net |  |  |  |  |  |  |
United States | $ | 1,233,949 |  |  | 79.0 | % |  | $ | 1,175,437 |  |  | 74.0 | %
Canada | 328,029 |  |  | 21.0 | % |  | 411,928 |  |  | 26.0 | %
Total property, plant and equipment, net | $ | 1,561,978 |  |  | 100.0 | % |  | $ | 1,587,365 |  |  | 100.0 | %
Permits and other intangibles, net |  |  |  |  |  |  |
United States | $ | 393,045 |  |  | 88.9 | % |  | $ | 408,654 |  |  | 87.1 | %
Canada | 48,830 |  |  | 11.1 | % |  | 60,474 |  |  | 12.9 | %
Total permits and other intangibles, net | $ | 441,875 |  |  | 100.0 | % |  | $ | 469,128 |  |  | 100.0 | %
PP&E and Intangible Assets by Segment | The following table presents assets by reported segment and in the aggregate (in thousands):
| December 31, 2018 |  | December 31, 2017
Property, plant and equipment, net |  |  |
Environmental Services | $ | 951,867 |  |  | $ | 927,139 |
Safety-Kleen | 553,220 |  |  | 582,162 |
Corporate Items | 56,891 |  |  | 78,064 |
Total property, plant and equipment, net | $ | 1,561,978 |  |  | $ | 1,587,365 |
Goodwill and Permits and other intangibles, net |  |  |
Environmental Services |  |  |
Goodwill | $ | 207,019 |  |  | $ | 172,386 |
Permits and other intangibles, net | 93,313 |  |  | 97,519 |
Total Environmental Services | 300,332 |  |  | 269,905 |
Safety-Kleen |  |  |
Goodwill | $ | 307,170 |  |  | $ | 306,137 |
Permits and other intangibles, net | 348,562 |  |  | 371,609 |
Total Safety-Kleen | 655,732 |  |  | 677,746 |
Total | $ | 956,064 |  |  | $ | 947,651 |
Total Assets by Segment | The following table presents the total assets by reported segment (in thousands):
| December 31, 2018 |  | December 31, 2017
Environmental Services | $ | 1,640,706 |  |  | $ | 1,541,241 |
Safety-Kleen | 1,431,381 |  |  | 1,471,291 |
Corporate Items | 666,234 |  |  | 694,038 |
Total | $ | 3,738,321 |  |  | $ | 3,706,570 |
Total Assets by Geographical Area | The following table presents the total assets by geographical area (in thousands):
| December 31, 2018 |  | December 31, 2017
United States | $ | 3,090,311 |  |  | $ | 2,985,394 |
Canada | 648,010 |  |  | 721,176 |
Total | $ | 3,738,321 |  |  | $ | 3,706,570 |

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