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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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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, 2024 |  | December 31, 2023
Commercial paper | $ | 4,035 |  |  | $ | 27,542 |
Total cash equivalents | 4,035 |  |  | 27,542 |
Commercial paper | 17,489 |  |  | 56,172 |
Corporate notes and bonds | 85,145 |  |  | 49,929 |
Total marketable securities | 102,634 |  |  | 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 Accounts |  | Revenue Allowance
| 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Balance at January 1, | $ | 22,568 |  |  | $ | 24,659 |  |  | $ | 24,136 |  |  | $ | 19,641 |  |  | $ | 20,594 |  |  | $ | 16,004 |
Additions charged to earnings | 8,129 |  |  | 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 Accounts |  | Revenue Allowance
| 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Balance at January 1, | $ | 22,568 |  |  | $ | 24,659 |  |  | $ | 24,136 |  |  | $ | 19,641 |  |  | $ | 20,594 |  |  | $ | 16,004 |
Additions charged to earnings | 8,129 |  |  | 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 Classification |  | Estimated 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, 2024 |  | December 31, 2023
Land | $ | 184,191 |  |  | $ | 174,891 |
Asset retirement costs (non-landfill) | 38,705 |  |  | 27,167 |
Landfill assets | 258,138 |  |  | 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 progress | 70,305 |  |  | 213,601 |
| 5,326,393 |  |  | 4,964,301 |
Less - accumulated depreciation and amortization | 2,878,452 |  |  | 2,770,983 |
Total property, plant and equipment, net | $ | 2,447,941 |  |  | $ | 2,193,318 |
___________________________________ (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 Name |  | Location |  | Remaining Lives (Years) |  | Permitted Remaining Highly Probable Airspace (cubic yards) (in thousands)
Buttonwillow |  | California |  | 21 |  | 4,909 |
Deer Trail |  | Colorado |  | 17 |  | 1,347 |
Grassy Mountain |  | Utah |  | 37 |  | 4,253 |
Kimball |  | Nebraska |  | 22 |  | 520 |
Lambton |  | Ontario, Canada |  | 46 |  | 4,218 |
Lone Mountain |  | Oklahoma |  | 13 |  | 2,913 |
Ryley |  | Alberta, Canada |  | 40 |  | 5,594 |
Sawyer |  | North Dakota |  | 61 |  | 3,197 |
|  |  |  |  |  | 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):
| 2024 |  | 2023
Remaining capacity, beginning of year | 27,753 |  |  | 28,270 |
Changes in highly probable airspace, net | — |  |  | 464 |
Consumed | (802) |  |  | (981) |
Remaining capacity, end of year | 26,951 |  |  | 27,753 |

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