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PROPERTY AND EQUIPMENT
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT PROPERTY AND EQUIPMENT
A summary of property and equipment is as follows:
 December 31,
 20232022
Land$47,863 $37,321 
Landfills786,130 730,914 
Finance lease right-of-use assets 101,770 90,362 
Buildings and improvements262,204 209,234 
Machinery and equipment287,175 243,359 
Rolling stock396,247 276,282 
Containers266,705 197,834 
Total property and equipment (1)
2,148,094 1,785,306 
Less: accumulated depreciation and amortization (1,167,541)(1,064,756)
Property and equipment, net
$980,553 $720,550 
(1)Includes construction-in-process of $74,408 and $53,439 at December 31, 2023 and December 31, 2022, respectively, that have have not been placed in service and, therefore, have not begun depreciating..
Depreciation expense for fiscal years 2023, 2022 and 2021 was $99,249, $78,139 and $62,342, respectively. Landfill amortization expense for fiscal years 2023, 2022 and 2021 was $40,419, $31,619 and $30,295, respectively.