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SEGMENT REPORTING (Tables) | 6 Months Ended
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Jun. 30, 2023
Segment Reporting [Abstract] |
Schedule of Reconciliation of Third Party Revenues to Direct Revenues | The following tables reconcile third-party revenues to direct revenues for the three and six months ended June 30, 2023 and 2022 (in thousands):
| For the Three Months Ended |  | For the Three Months Ended
| June 30, 2023 |  | June 30, 2022
| Third-Party Revenues |  | Intersegment Revenues (Expenses), net |  |  |  | Direct Revenues |  | Third-Party Revenues |  | Intersegment Revenues (Expenses), net |  |  |  | Direct Revenues
Environmental Services | $ | 1,161,482 |  |  | $ | 10,554 |  |  |  |  | $ | 1,172,036 |  |  | $ | 1,084,506 |  |  | $ | 6,237 |  |  |  |  | $ | 1,090,743 |
Safety-Kleen Sustainability Solutions | 236,302 |  |  | (10,554) |  |  |  |  | 225,748 |  |  | 271,727 |  |  | (6,237) |  |  |  |  | 265,490 |
Corporate Items | 116 |  |  | — |  |  |  |  | 116 |  |  | 79 |  |  | — |  |  |  |  | 79 |
Total | $ | 1,397,900 |  |  | $ | — |  |  |  |  | $ | 1,397,900 |  |  | $ | 1,356,312 |  |  | $ | — |  |  |  |  | $ | 1,356,312 |
| For the Six Months Ended |  | For the Six Months Ended
| June 30, 2023 |  | June 30, 2022
| Third-Party Revenues |  | Intersegment Revenues (Expenses), net |  |  |  | Direct Revenues |  | Third-Party Revenues |  | Intersegment Revenues (Expenses), net |  | Direct Revenues
Environmental Services | $ | 2,222,464 |  |  | $ | 20,313 |  |  |  |  | $ | 2,242,777 |  |  | $ | 2,025,304 |  |  | $ | 12,884 |  |  | $ | 2,038,188 |
Safety-Kleen Sustainability Solutions | 482,600 |  |  | (20,313) |  |  |  |  | 462,287 |  |  | 499,966 |  |  | (12,884) |  |  | 487,082 |
Corporate Items | 223 |  |  | — |  |  |  |  | 223 |  |  | 151 |  |  | — |  |  | 151 |
Total | $ | 2,705,287 |  |  | $ | — |  |  |  |  | $ | 2,705,287 |  |  | $ | 2,525,421 |  |  | $ | — |  |  | $ | 2,525,421 |
Schedule of 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 Three Months Ended |  | For the Six Months Ended
| June 30, |  | June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Adjusted EBITDA: |  |  |  |  |  |  |
Environmental Services | $ | 305,622 |  |  | $ | 269,341 |  |  | $ | 533,967 |  |  | $ | 452,943 |
Safety-Kleen Sustainability Solutions | 53,415 |  |  | 97,010 |  |  | 94,878 |  |  | 148,887 |
Corporate Items | (71,531) |  |  | (57,281) |  |  | (126,201) |  |  | (112,501) |
Total | 287,506 |  |  | 309,070 |  |  | 502,644 |  |  | 489,329 |
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |
Accretion of environmental liabilities | 3,486 |  |  | 3,197 |  |  | 6,893 |  |  | 6,353 |
Stock-based compensation | 4,500 |  |  | 6,835 |  |  | 10,518 |  |  | 12,547 |
Depreciation and amortization | 89,697 |  |  | 87,868 |  |  | 174,455 |  |  | 172,166 |
Income from operations | 189,823 |  |  | 211,170 |  |  | 310,778 |  |  | 298,263 |
Other expense (income), net | 1,283 |  |  | (1,265) |  |  | 1,167 |  |  | (1,969) |
Loss on early extinguishment of debt | — |  |  | — |  |  | 2,362 |  |  | — |
Gain on sale of business | — |  |  | (8,864) |  |  | — |  |  | (8,864) |
Interest expense, net of interest income | 30,072 |  |  | 26,256 |  |  | 50,704 |  |  | 51,273 |
Income before provision for income taxes | $ | 158,468 |  |  | $ | 195,043 |  |  | $ | 256,545 |  |  | $ | 257,823 |

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