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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
A summary of property, plant and equipment is as follows:
 December 31,
 20202019
Land$30,061 $28,703 
Landfills635,144 578,814 
Finance lease right-of-use assets 39,683 24,038 
Buildings and improvements169,325 161,316 
Machinery and equipment178,104 168,735 
Rolling stock204,333 183,145 
Containers154,744 143,948 
1,411,394 1,288,699 
Less: accumulated depreciation and amortization (900,882)(844,874)
$510,512 $443,825 
Depreciation expense for fiscal years 2020, 2019 and 2018 was $54,370, $45,060 and $35,351, respectively. Landfill amortization expense for fiscal years 2020, 2019 and 2018 was $27,520, $27,512 and $31,841, respectively.