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PROPERTY, PLANT AND EQUIPMENT
 9 Months Ended
Sep. 30, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following (in thousands):
September 30, 2022December 31, 2021
Land$172,143 $165,010 
Asset retirement costs (non-landfill)20,832 19,105 
Landfill assets217,277 205,873 
Buildings and improvements (1)
575,429 551,795 
Camp equipment115,859 127,680 
Vehicles (2)
1,066,576 912,836 
Equipment (3)
2,042,972 2,092,395 
Furniture and fixtures6,458 6,444 
Construction in progress124,069 60,447 
4,341,615 4,141,585 
Less - accumulated depreciation and amortization2,417,940 2,278,410 
Total property, plant and equipment, net$1,923,675 $1,863,175 
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(1) Balances inclusive of gross right-of-use ("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 $88.8 million and $77.7 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.1 million and $9.3 million, respectively.
Depreciation expense, inclusive of landfill and finance lease amortization, was $75.3 million and $223.0 million for the three and nine months ended September 30, 2022, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $63.9 million and $192.3 million for the three and nine months ended September 30, 2021, respectively.