XML 44 R31.htm IDEA: XBRL DOCUMENT v3.22.0.1
SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Marketable Securities As of December 31, 2021 and 2020, the Company had total marketable securities as follows (in thousands):
December 31, 2021December 31, 2020
U.S. Treasury securities$901 $28,901 
Municipal bonds1,978 — 
Corporate notes and bonds57,685 22,956 
Commercial paper21,160 — 
Total marketable securities$81,724 $51,857 
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
202120202019202120202019
Balance at January 1,$24,634 $22,493 $26,368 $20,115 $16,218 $17,947 
Additions charged to earnings8,018 10,133 2,408 34,319 45,784 35,549 
Deductions from reserves, net of recoveries(8,516)(7,992)(6,283)(38,430)(41,887)(37,278)
Balance at December 31,$24,136 $24,634 $22,493 $16,004 $20,115 $16,218 
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
202120202019202120202019
Balance at January 1,$24,634 $22,493 $26,368 $20,115 $16,218 $17,947 
Additions charged to earnings8,018 10,133 2,408 34,319 45,784 35,549 
Deductions from reserves, net of recoveries(8,516)(7,992)(6,283)(38,430)(41,887)(37,278)
Balance at December 31,$24,136 $24,634 $22,493 $16,004 $20,115 $16,218 
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, 2021December 31, 2020
Land$165,010 $139,776 
Asset retirement costs (non-landfill)19,105 16,407 
Landfill assets205,873 191,687 
Buildings and improvements (1)
551,795 509,804 
Camp equipment127,680 159,021 
Vehicles (2)
912,836 844,026 
Equipment (3)
2,092,395 1,807,235 
Furniture and fixtures6,444 7,082 
Construction in progress60,447 24,378 
4,141,585 3,699,416 
Less - accumulated depreciation and amortization2,278,410 2,174,118 
Total property, plant and equipment, net$1,863,175 $1,525,298 
___________________________________
(1) Balances inclusive of gross ROU assets classified as finance leases of $8.9 million in both periods.
(2) Balances inclusive of gross ROU assets classified as finance leases of $77.7 million and $47.2 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.3 million both periods.
Schedule of Active Landfill Sites
As of December 31, 2021, the Company had 9 active landfill sites (including the Company's two non-commercial landfills), which have estimated remaining lives (based on anticipated waste volumes and remaining highly probable airspace) as follows:
Facility NameLocationRemaining
Lives
(Years)		Permitted Remaining Highly Probable Airspace
(cubic yards) (in thousands)
ButtonwillowCalifornia215,500 
Deer ParkTexas132 
Deer TrailColorado261,572 
Grassy MountainUtah404,608 
KimballNebraska5120 
LambtonOntario, Canada484,534 
Lone MountainOklahoma163,617 
RyleyAlberta, Canada3455 
SawyerNorth Dakota843,346 
  23,784 
Schedule of Remaining Highly Probable Airspace
The following table presents the remaining highly probable airspace from January 1, 2019 through December 31, 2021 (in thousands of cubic yards):
202120202019
Remaining capacity, beginning of year24,716 28,494 29,760 
Changes in highly probable airspace, net— (2,962)— 
Consumed(932)(816)(1,266)
Remaining capacity, end of year23,784 24,716 28,494