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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]  
Schedule of Marketable Securities As of December 31, 2022 and 2021, the Company had total marketable securities as follows (in thousands):
December 31, 2022December 31, 2021
Commercial paper$5,035 $— 
U.S. Treasury securities28,973 — 
Total cash equivalents34,008 — 
U.S. Treasury securities— 901 
Municipal bonds1,930 1,978 
Commercial paper24,075 21,160 
Corporate notes and bonds36,028 57,685 
Total marketable securities62,033 81,724 
Total$96,041 $81,724 
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
202220212020202220212020
Balance at January 1,$24,136 $24,634 $22,493 $16,004 $20,115 $16,218 
Additions charged to earnings7,783 8,018 10,133 54,836 34,319 45,784 
Deductions from reserves, net of recoveries(7,260)(8,516)(7,992)(50,246)(38,430)(41,887)
Balance at December 31,$24,659 $24,136 $24,634 $20,594 $16,004 $20,115 
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
202220212020202220212020
Balance at January 1,$24,136 $24,634 $22,493 $16,004 $20,115 $16,218 
Additions charged to earnings7,783 8,018 10,133 54,836 34,319 45,784 
Deductions from reserves, net of recoveries(7,260)(8,516)(7,992)(50,246)(38,430)(41,887)
Balance at December 31,$24,659 $24,136 $24,634 $20,594 $16,004 $20,115 
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
Camp and lodging equipment
8-15 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, 2022December 31, 2021
Land$172,579 $165,010 
Asset retirement costs (non-landfill)22,001 19,105 
Landfill assets232,872 205,873 
Buildings and improvements (1)
584,916 551,795 
Camp equipment116,976 127,680 
Vehicles (2)
1,112,188 912,836 
Equipment (3)
2,078,088 2,092,395 
Furniture and fixtures6,481 6,444 
Construction in progress140,328 60,447 
4,466,429 4,141,585 
Less - accumulated depreciation and amortization2,486,127 2,278,410 
Total property, plant and equipment, net$1,980,302 $1,863,175 
___________________________________
(1) Balances inclusive of gross ROU assets classified as finance leases of $8.0 million and $8.9 million, respectively.
(2) Balances inclusive of gross ROU assets classified as finance leases of $106.7 million and $77.7 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.2 million and $9.3 million, respectively.
Schedule of Active Landfill Sites
As of December 31, 2022, the Company had nine active landfill sites including the Company's two non-commercial landfills. It is anticipated that the non-commercial landfill at the Deer Park, Texas incineration facility will reach its permitted capacity early in 2023 at which point the Company will commence closure activities. This landfill has been excluded from the table below which includes the estimated remaining lives (based on anticipated waste volumes and remaining highly probable airspace) for the remaining eight landfills, as follows:
Facility NameLocationRemaining
Lives
(Years)		Permitted Remaining Highly Probable Airspace
(cubic yards) (in thousands)
ButtonwillowCalifornia205,197 
Deer TrailColorado231,488 
Grassy MountainUtah394,454 
KimballNebraska5116 
LambtonOntario, Canada474,443 
Lone MountainOklahoma163,412 
RyleyAlberta, Canada375,851 
SawyerNorth Dakota833,309 
  28,270 
Schedule of Remaining Highly Probable Airspace
The following table presents the remaining highly probable airspace from January 1, 2021 through December 31, 2022 (in thousands of cubic yards):
20222021
Remaining capacity, beginning of year23,784 24,716 
Changes in highly probable airspace, net5,579 — 
Consumed(1,093)(932)
Remaining capacity, end of year28,270 23,784