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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]  
Schedule of Marketable Securities As of December 31, 2024 and 2023, the Company had total marketable securities as follows (in thousands):
December 31, 2024December 31, 2023
Commercial paper$4,035 $27,542 
Total cash equivalents4,035 27,542 
Commercial paper17,489 56,172 
Corporate notes and bonds85,145 49,929 
Total marketable securities102,634 106,101 
Total$106,669 $133,643 
Schedule of Activity in Allowance for Doubtful Accounts
The following table reflects the activity in the allowance for doubtful accounts and revenue allowance (in thousands):
Allowance for Doubtful AccountsRevenue Allowance
202420232022202420232022
Balance at January 1,$22,568 $24,659 $24,136 $19,641 $20,594 $16,004 
Additions charged to earnings8,129 5,956 7,783 48,301 46,467 54,836 
Deductions from reserves, net of recoveries(7,789)(8,047)(7,260)(43,608)(47,420)(50,246)
Balance at December 31,$22,908 $22,568 $24,659 $24,334 $19,641 $20,594 
Schedule of Activity in Revenue Allowance
The following table reflects the activity in the allowance for doubtful accounts and revenue allowance (in thousands):
Allowance for Doubtful AccountsRevenue Allowance
202420232022202420232022
Balance at January 1,$22,568 $24,659 $24,136 $19,641 $20,594 $16,004 
Additions charged to earnings8,129 5,956 7,783 48,301 46,467 54,836 
Deductions from reserves, net of recoveries(7,789)(8,047)(7,260)(43,608)(47,420)(50,246)
Balance at December 31,$22,908 $22,568 $24,659 $24,334 $19,641 $20,594 
Schedule of Asset Classification and Estimated Useful Life
The Company depreciates and amortizes the capitalized cost of these assets, using the straight-line method as follows:
Asset ClassificationEstimated Useful Life
Buildings and building improvements 
Buildings
20-42 years
Leasehold and building improvements
2-45 years
Vehicles
2-15 years
Equipment 
Capitalized software and computer equipment
3-5 years
Containers and railcars
8-16 years
All other equipment
4-30 years
Furniture and fixtures
5-8 years
Property, plant and equipment consisted of the following (in thousands):
December 31, 2024December 31, 2023
Land$184,191 $174,891 
Asset retirement costs (non-landfill)38,705 27,167 
Landfill assets258,138 253,180 
Buildings and improvements (1)
719,439 630,525 
Vehicles (2)
1,455,530 1,276,567 
Equipment (3)
2,600,085 2,388,370 
Construction in progress70,305 213,601 
5,326,393 4,964,301 
Less - accumulated depreciation and amortization2,878,452 2,770,983 
Total property, plant and equipment, net$2,447,941 $2,193,318 
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(1) Balances inclusive of gross ROU assets classified as finance leases of $8.0 million in both periods.
(2) Balances inclusive of gross ROU assets classified as finance leases of $230.5 million and $151.7 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.2 million in both periods.
Schedule of Active Landfill Sites
As of December 31, 2024, the Company had eight active landfill sites (including the Company's non-commercial landfill), which have estimated remaining lives (based on anticipated waste volumes and the remaining highly probable airspace) as follows:
Facility NameLocationRemaining
Lives
(Years)		Permitted Remaining Highly Probable Airspace
(cubic yards) (in thousands)
ButtonwillowCalifornia214,909 
Deer TrailColorado171,347 
Grassy MountainUtah374,253 
KimballNebraska22520 
LambtonOntario, Canada464,218 
Lone MountainOklahoma132,913 
RyleyAlberta, Canada405,594 
SawyerNorth Dakota613,197 
  26,951 
Schedule of Remaining Highly Probable Airspace
The following table presents the remaining highly probable airspace from January 1, 2023 through December 31, 2024 (in thousands of cubic yards):
20242023
Remaining capacity, beginning of year27,753 28,270 
Changes in highly probable airspace, net— 464 
Consumed(802)(981)
Remaining capacity, end of year26,951 27,753