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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Estimated Useful Lives of Assets
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 Classification
  
Estimated
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,
 
2018
 
2017
Land
$
25,490

 
$
24,224

Landfills
544,663

 
513,548

Landfill operating lease contracts
121,877

 
114,462

Buildings and improvements
150,885

 
140,155

Machinery and equipment
153,222

 
139,029

Rolling stock
163,758

 
138,102

Containers
123,383

 
103,501

 
1,283,278

 
1,173,021

Less: accumulated depreciation and amortization
(878,701
)
 
(811,474
)
 
$
404,577

 
$
361,547