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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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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, 2022 |  | December 31, 2021
Commercial paper | $ | 5,035 |  |  | $ | — |
U.S. Treasury securities | 28,973 |  |  | — |
Total cash equivalents | 34,008 |  |  | — |
U.S. Treasury securities | — |  |  | 901 |
Municipal bonds | 1,930 |  |  | 1,978 |
Commercial paper | 24,075 |  |  | 21,160 |
Corporate notes and bonds | 36,028 |  |  | 57,685 |
Total marketable securities | 62,033 |  |  | 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 Accounts |  | Revenue Allowance
| 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Balance at January 1, | $ | 24,136 |  |  | $ | 24,634 |  |  | $ | 22,493 |  |  | $ | 16,004 |  |  | $ | 20,115 |  |  | $ | 16,218 |
Additions charged to earnings | 7,783 |  |  | 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 Accounts |  | Revenue Allowance
| 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Balance at January 1, | $ | 24,136 |  |  | $ | 24,634 |  |  | $ | 22,493 |  |  | $ | 16,004 |  |  | $ | 20,115 |  |  | $ | 16,218 |
Additions charged to earnings | 7,783 |  |  | 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 Classification |  | Estimated 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, 2022 |  | December 31, 2021
Land | $ | 172,579 |  |  | $ | 165,010 |
Asset retirement costs (non-landfill) | 22,001 |  |  | 19,105 |
Landfill assets | 232,872 |  |  | 205,873 |
Buildings and improvements (1) | 584,916 |  |  | 551,795 |
Camp equipment | 116,976 |  |  | 127,680 |
Vehicles (2) | 1,112,188 |  |  | 912,836 |
Equipment (3) | 2,078,088 |  |  | 2,092,395 |
Furniture and fixtures | 6,481 |  |  | 6,444 |
Construction in progress | 140,328 |  |  | 60,447 |
| 4,466,429 |  |  | 4,141,585 |
Less - accumulated depreciation and amortization | 2,486,127 |  |  | 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 Name |  | Location |  | Remaining Lives (Years) |  | Permitted Remaining Highly Probable Airspace (cubic yards) (in thousands)
Buttonwillow |  | California |  | 20 |  | 5,197 |
Deer Trail |  | Colorado |  | 23 |  | 1,488 |
Grassy Mountain |  | Utah |  | 39 |  | 4,454 |
Kimball |  | Nebraska |  | 5 |  | 116 |
Lambton |  | Ontario, Canada |  | 47 |  | 4,443 |
Lone Mountain |  | Oklahoma |  | 16 |  | 3,412 |
Ryley |  | Alberta, Canada |  | 37 |  | 5,851 |
Sawyer |  | North Dakota |  | 83 |  | 3,309 |
|  |  |  |  |  | 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):
| 2022 |  | 2021
Remaining capacity, beginning of year | 23,784 |  |  | 24,716 |
Changes in highly probable airspace, net | 5,579 |  |  | — |
Consumed | (1,093) |  |  | (932) |
Remaining capacity, end of year | 28,270 |  |  | 23,784 |

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