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PROPERTY, PLANT AND EQUIPMENT
 3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following (in thousands):
March 31, 2021December 31, 2020
Land$145,662 $139,776 
Asset retirement costs (non-landfill)17,747 16,407 
Landfill assets193,009 191,687 
Buildings and improvements (1)
514,711 509,804 
Camp equipment158,281 159,021 
Vehicles (2)
855,842 844,026 
Equipment (3)
1,812,858 1,807,235 
Furniture and fixtures6,992 7,082 
Construction in progress39,943 24,378 
3,745,045 3,699,416 
Less - accumulated depreciation and amortization2,217,101 2,174,118 
Total property, plant and equipment, net$1,527,944 $1,525,298 
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(1) Balances inclusive of gross right-of-use ("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 $56.4 million and $47.2 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.4 million and $9.3 million, respectively.
Depreciation expense, inclusive of landfill and finance lease amortization, was $64.6 million and $65.4 million for the three months ended March 31, 2021 and March 31, 2020, respectively.