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SEGMENT REPORTING
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
SEGMENT REPORTING SEGMENT REPORTING
Segment reporting is prepared on the same basis that the Company's chief executive officer, who is the Company's chief operating decision maker, manages the business, makes operating decisions and assesses performance. As described in Note 2, during the first quarter of 2021, certain of the Company's businesses undertook a reorganization which included changes to the underlying business and management structures. The Company's chief operating decision maker also requested changes in the information that he regularly reviews for purposes of allocating resources and assessing performance so that information would align with the new operating structure of the business. Due to these changes, the Company reassessed its determination of operating segments in the first quarter of 2021 which resulted in a change in the operating segments. The Company consolidated the core services of Safety-Kleen Environmental Services into its Environmental Services segment, eliminated its Safety-Kleen segment and created the Safety-Kleen Sustainability Solutions segment. In addition, certain intercompany transactions previously recorded as Corporate Items have been allocated to the segments. All the historical balances presented below have been recast to reflect the impact of these changes.
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 years ended December 31, 2021, 2020 and 2019 (in thousands):
 For the year ended December 31, 2021
 Environmental
Services		Safety-Kleen Sustainability SolutionsCorporate
Items		Totals
Third-party revenues$3,025,907 $779,360 $299 $3,805,566 
Intersegment revenues, net6,547 (6,547)— — 
Direct revenues$3,032,454 $772,813 $299 $3,805,566 
 For the year ended December 31, 2020
 Environmental
Services
Safety-Kleen Sustainability Solutions
Corporate
Items		Totals
Third-party revenues$2,637,641 $506,166 $290 $3,144,097 
Intersegment revenues, net(1,740)1,740 — — 
Direct revenues$2,635,901 $507,906 $290 $3,144,097 
 For the year ended December 31, 2019
 Environmental
Services
Safety-Kleen Sustainability Solutions
Corporate
Items		Totals
Third-party revenues$2,802,682 $608,372 $1,136 $3,412,190 
Intersegment revenues, net(6,688)6,688 — — 
Direct revenues$2,795,994 $615,060 $1,136 $3,412,190 
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 expense (income), 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 years ended December 31,
 202120202019
Adjusted EBITDA:   
Environmental Services$659,718 $665,918 $600,413 
Safety-Kleen Sustainability Solutions227,354 83,214 128,249 
Corporate Items(210,466)(175,328)(170,529)
Total676,606 573,804 558,133 
Reconciliation to Consolidated Statements of Operations:   
Accretion of environmental liabilities11,745 11,051 10,136 
Stock-based compensation18,839 18,502 17,816 
Depreciation and amortization298,135 292,915 300,725 
Income from operations347,887 251,336 229,456 
Other expense (income), net515 290 (2,897)
Loss on early extinguishment of debt— — 6,131 
Loss (gain) on sale of businesses— 3,376 (687)
Interest expense, net of interest income77,657 73,120 78,670 
Income from operations before provision for income taxes$269,715 $174,550 $148,239 

The following table presents assets by reported segment and in the aggregate (in thousands):
December 31, 2021December 31, 2020
Property, plant and equipment, net  
Environmental Services$1,374,913 $1,068,910 
Safety-Kleen Sustainability Solutions373,721 366,160 
Corporate Items114,541 90,228 
Total property, plant and equipment, net$1,863,175 $1,525,298 
Goodwill and Permits and other intangibles, net  
Environmental Services  
Goodwill$1,085,534 $401,918 
Permits and other intangibles, net498,739 228,237 
Total Environmental Services1,584,273 630,155 
Safety-Kleen Sustainability Solutions
Goodwill$141,508 $125,105 
Permits and other intangibles, net146,173 158,383 
Total Safety-Kleen Sustainability Solutions287,681 283,488 
Total$1,871,954 $913,643 
Geographic Information
As of December 31, 2021 and 2020, the Company had property, plant and equipment, net of depreciation and amortization and permits and other intangible assets, net of amortization in the following geographic locations (in thousands):
December 31, 2021December 31, 2020
Total% of TotalTotal% of Total
Property, plant and equipment, net  
United States$1,610,402 86.4 %$1,246,758 81.7 %
Canada and other foreign252,773 13.6 278,540 18.3 
Total property, plant and equipment, net$1,863,175 100.0 %$1,525,298 100.0 %
Permits and other intangibles, net  
United States$604,076 93.7 %$342,787 88.7 %
Canada and other foreign40,836 6.3 43,833 11.3 
Total permits and other intangibles, net$644,912 100.0 %$386,620 100.0 %
The following table presents the total assets by geographical area (in thousands):
December 31, 2021December 31, 2020
United States$5,077,585 $3,447,811 
Canada and other foreign576,114 683,709 
Total$5,653,699 $4,131,520