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SEGMENT REPORTING
 9 Months Ended
Sep. 30, 2023
Segment Reporting [Abstract]  
SEGMENT REPORTING SEGMENT REPORTING 
Segment reporting is prepared on the same basis that the Company's chief operating decision maker, which is a committee comprised of the Company's co-Chief Executive Officers, manages the business, makes operating decisions and assesses performance. The Company is managed and reports as two operating segments; (i) the Environmental Services segment and (ii) the Safety-Kleen Sustainability Solutions segment.
Third-party revenue is revenue billed to outside customers by a particular segment. Direct revenues is revenue allocated to the segment providing the product or service. Intersegment revenues represent the sharing of third-party revenues among the segments based on products and services provided by each segment as if the products and services were sold directly to the third-party. The intersegment revenues are shown net. The operations not managed through the Company’s operating segments described above are recorded as “Corporate Items.”
The following tables reconcile third-party revenues to direct revenues for the three and nine months ended September 30, 2023 and 2022 (in thousands):
For the Three Months EndedFor the Three Months Ended
September 30, 2023September 30, 2022
Third-Party RevenuesIntersegment Revenues (Expenses), netDirect RevenuesThird-Party RevenuesIntersegment Revenues (Expenses), netDirect Revenues
Environmental Services$1,135,279 $11,084 $1,146,363 $1,080,032 $6,452 $1,086,484 
Safety-Kleen Sustainability Solutions230,305 (11,084)219,221 282,771 (6,452)276,319 
Corporate Items112 — 112 283 — 283 
Total$1,365,696 $— $1,365,696 $1,363,086 $— $1,363,086 

For the Nine Months EndedFor the Nine Months Ended
September 30, 2023September 30, 2022
Third-Party RevenuesIntersegment Revenues (Expenses), netDirect RevenuesThird-Party RevenuesIntersegment Revenues (Expenses), netDirect Revenues
Environmental Services$3,357,743 $31,397 $3,389,140 $3,105,336 $19,336 $3,124,672 
Safety-Kleen Sustainability Solutions712,905 (31,397)681,508 782,737 (19,336)763,401 
Corporate Items335 — 335 434 — 434 
Total$4,070,983 $— $4,070,983 $3,888,507 $— $3,888,507 
The primary financial measure by which the Company evaluates the performance of its segments is Adjusted EBITDA, which consists of net income plus accretion of environmental liabilities, stock-based compensation, depreciation and amortization, net interest expense, loss on early extinguishment of debt and provision for income taxes and excludes other gains, losses and non-cash charges not deemed representative of fundamental segment results and other income (expense), net. Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers.
The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):
 For the Three Months EndedFor the Nine Months Ended
September 30,September 30,
 2023202220232022
Adjusted EBITDA:  
Environmental Services$288,982 $260,687 $822,949 $713,630 
Safety-Kleen Sustainability Solutions31,146 103,156 126,024 252,043 
Corporate Items(65,111)(55,288)(191,312)(167,789)
Total255,017 308,555 757,661 797,884 
Reconciliation to Consolidated Statements of Operations:  
Accretion of environmental liabilities3,388 3,246 10,281 9,599 
Stock-based compensation4,291 7,828 14,809 20,375 
Depreciation and amortization92,970 88,394 267,425 260,560 
Income from operations154,368 209,087 465,146 507,350 
Other (income) expense, net(334)(104)833 (2,073)
Loss on early extinguishment of debt— — 2,362 — 
Gain on sale of business— — — (8,864)
Interest expense, net of interest income29,696 28,081 80,400 79,354 
Income before provision for income taxes$125,006 $181,110 $381,551 $438,933