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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2021
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,
 20212020
Land$34,118 $30,061 
Landfills677,023 635,144 
Finance lease right-of-use assets 78,851 39,683 
Buildings and improvements187,810 169,325 
Machinery and equipment207,305 178,104 
Rolling stock252,642 204,333 
Containers179,949 154,744 
1,617,698 1,411,394 
Less: accumulated depreciation and amortization (973,094)(900,882)
$644,604 $510,512