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SEGMENT REPORTING (Tables) | 6 Months Ended
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Jun. 30, 2022
Segment Reporting [Abstract] |
Reconciliation of Third Party Revenues to Direct Revenues | The following table reconciles third-party revenues to direct revenues for the three and six months ended June 30, 2022 and 2021 (in thousands):
| For the Three Months Ended June 30, 2022 |  | For the Three Months Ended June 30, 2021
| Third-party revenues |  | Intersegment revenues, net |  |  |  | Direct revenues |  | Third-party revenues |  | Intersegment revenues, net |  | Direct revenues
Environmental Services | $ | 1,084,506 |  |  | $ | 6,237 |  |  |  |  | $ | 1,090,743 |  |  | $ | 723,147 |  |  | $ | 950 |  |  | $ | 724,097 |
Safety-Kleen Sustainability Solutions | 271,727 |  |  | (6,237) |  |  |  |  | 265,490 |  |  | 203,232 |  |  | (950) |  |  | 202,282 |
Corporate Items | 79 |  |  | — |  |  |  |  | 79 |  |  | 79 |  |  | — |  |  | 79 |
Total | $ | 1,356,312 |  |  | $ | — |  |  |  |  | $ | 1,356,312 |  |  | $ | 926,458 |  |  | $ | — |  |  | $ | 926,458 |
| For the Six Months Ended June 30, 2022 |  | For the Six Months Ended June 30, 2021
| Third-party revenues |  | Intersegment revenues, net |  |  |  | Direct revenues |  | Third-party revenues |  | Intersegment revenues, net |  | Direct revenues
Environmental Services | $ | 2,025,304 |  |  | $ | 12,884 |  |  |  |  | $ | 2,038,188 |  |  | $ | 1,376,025 |  |  | $ | 2,674 |  |  | $ | 1,378,699 |
Safety-Kleen Sustainability Solutions | 499,966 |  |  | (12,884) |  |  |  |  | 487,082 |  |  | 358,423 |  |  | (2,674) |  |  | 355,749 |
Corporate Items | 151 |  |  | — |  |  |  |  | 151 |  |  | 158 |  |  | — |  |  | 158 |
Total | $ | 2,525,421 |  |  | $ | — |  |  |  |  | $ | 2,525,421 |  |  | $ | 1,734,606 |  |  | $ | — |  |  | $ | 1,734,606 |
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,
| 2022 |  | 2021 |  | 2022 |  | 2021
Adjusted EBITDA: |  |  |  |  |  |  |
Environmental Services | $ | 269,341 |  |  | $ | 176,041 |  |  | $ | 452,943 |  |  | $ | 316,295 |
Safety-Kleen Sustainability Solutions | 97,010 |  |  | 63,314 |  |  | 148,887 |  |  | 94,946 |
Corporate Items | (57,281) |  |  | (51,584) |  |  | (112,501) |  |  | (94,019) |
Total | 309,070 |  |  | 187,771 |  |  | 489,329 |  |  | 317,222 |
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |
Accretion of environmental liabilities | 3,197 |  |  | 2,873 |  |  | 6,353 |  |  | 5,826 |
Stock-based compensation | 6,835 |  |  | 3,305 |  |  | 12,547 |  |  | 6,785 |
Depreciation and amortization | 87,868 |  |  | 71,592 |  |  | 172,166 |  |  | 143,755 |
Income from operations | 211,170 |  |  | 110,001 |  |  | 298,263 |  |  | 160,856 |
Other (income) expense, net | (1,265) |  |  | 1,480 |  |  | (1,969) |  |  | 2,708 |
Gain on sale of business | (8,864) |  |  | — |  |  | (8,864) |  |  | — |
Interest expense, net of interest income | 26,256 |  |  | 18,051 |  |  | 51,273 |  |  | 35,969 |
Income before provision for income taxes | $ | 195,043 |  |  | $ | 90,470 |  |  | $ | 257,823 |  |  | $ | 122,179 |

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 + Details
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