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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Components of Property, Plant and Equipment We provide for depreciation and amortization using the straight-line method by charges to operations in amounts that allocate the cost of the assets over their estimated useful lives as follows:
Asset ClassificationEstimated
Useful Life
Buildings and improvements
10-30 years
Machinery and equipment
5-10 years
Rolling stock
5-10 years
Containers
5-12 years
Furniture and Fixtures
3-8 years
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