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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]  
Schedule of Marketable Securities As of December 31, 2023 and 2022, the Company had total marketable securities as follows (in thousands):
December 31, 2023December 31, 2022
Commercial paper$27,542 $5,035 
U.S. Treasury securities— 28,973 
Total cash equivalents27,542 34,008 
Municipal bonds— 1,930 
Commercial paper56,172 24,075 
Corporate notes and bonds49,929 36,028 
Total marketable securities106,101 62,033 
Total$133,643 $96,041 
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
202320222021202320222021
Balance at January 1,$24,659 $24,136 $24,634 $20,594 $16,004 $20,115 
Additions charged to earnings5,956 7,783 8,018 46,467 54,836 34,319 
Deductions from reserves, net of recoveries(8,047)(7,260)(8,516)(47,420)(50,246)(38,430)
Balance at December 31,$22,568 $24,659 $24,136 $19,641 $20,594 $16,004 
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
202320222021202320222021
Balance at January 1,$24,659 $24,136 $24,634 $20,594 $16,004 $20,115 
Additions charged to earnings5,956 7,783 8,018 46,467 54,836 34,319 
Deductions from reserves, net of recoveries(8,047)(7,260)(8,516)(47,420)(50,246)(38,430)
Balance at December 31,$22,568 $24,659 $24,136 $19,641 $20,594 $16,004 
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, 2023December 31, 2022
Land$174,891 $172,579 
Asset retirement costs (non-landfill)27,167 22,001 
Landfill assets253,180 232,872 
Buildings and improvements (1)
630,525 591,397 
Vehicles (2)
1,276,567 1,112,188 
Equipment (3)
2,388,370 2,195,064 
Construction in progress213,601 140,328 
4,964,301 4,466,429 
Less - accumulated depreciation and amortization2,770,983 2,486,127 
Total property, plant and equipment, net$2,193,318 $1,980,302 
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(1) Balances inclusive of gross ROU assets classified as finance leases of $8.0 million.
(2) Balances inclusive of gross ROU assets classified as finance leases of $151.7 million and $106.7 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.2 million.
Schedule of Active Landfill Sites
As of December 31, 2023, 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)
ButtonwillowCalifornia204,999 
Deer TrailColorado211,420 
Grassy MountainUtah344,320 
KimballNebraska23547 
LambtonOntario, Canada464,350 
Lone MountainOklahoma163,165 
RyleyAlberta, Canada305,692 
SawyerNorth Dakota653,260 
  27,753 
Schedule of Remaining Highly Probable Airspace
The following table presents the remaining highly probable airspace from January 1, 2022 through December 31, 2023 (in thousands of cubic yards):
20232022
Remaining capacity, beginning of year28,270 23,784 
Changes in highly probable airspace, net464 5,579 
Consumed(981)(1,093)
Remaining capacity, end of year27,753 28,270