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SEGMENT REPORTING
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
SEGMENT REPORTING SEGMENT REPORTING
We report selected information about our reportable operating segments in a manner consistent with that used for internal management reporting. We classify our solid waste operations on a geographic basis through regional operating segments, our Western and Eastern regions. Revenues associated with our solid waste operations are derived mainly from solid waste collection and disposal, landfill, landfill gas-to-energy, processing, transfer and recycling services in the northeastern United States. Effective January 1, 2021, we reorganized the Resource Solutions operating segment, which includes our larger-scale recycling and commodity brokerage operations along with our organics services and large scale commercial and industrial services, from our historical lines-of-service of recycling, organics and customer solutions into two lines-of-service: processing and non-processing. Revenues from processing services are derived from municipalities and customers in the form of processing fees, tipping fees, commodity sales, and organic material sales. Revenues from non-processing services are derived from brokerage services; overall resource management services providing a wide range of environmental services and zero waste solutions to large and complex organizations; and traditional collection, disposal and recycling services provided to large account multi-site customers. Revenues classification by service line reported in the three months ended March 31, 2020 has been reclassified to conform with the presentation for the three months ended March 31, 2021. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment.
Three Months Ended March 31, 2021
SegmentOutside
revenues		Inter-company
revenues		Depreciation and
amortization		Operating
income (loss)		Total
assets
Eastern$52,345 $12,426 $6,622 $2,245 $221,200 
Western85,764 28,682 14,039 7,756 646,381 
Resource solutions51,423 1,903 1,568 2,462 88,759 
Corporate entities— — 453 (454)237,906 
Eliminations— (43,011)— — — 
$189,532 $— $22,682 $12,009 $1,194,246 

Three Months Ended March 31, 2020
SegmentOutside
revenues		Inter-company
revenues		Depreciation and
amortization		Operating
income (loss)		Total
assets
Eastern$50,143 $11,839 $5,958 $975 $206,334 
Western85,206 25,546 13,232 5,642 599,815 
Resource solutions47,561 2,894 1,610 1,003 93,199 
Corporate entities— — 606 (608)58,292 
Eliminations— (40,279)— — — 
$182,910 $— $21,406 $7,012 $957,640 

A summary of our revenues attributable to services provided follows:
 Three Months Ended
March 31,
 20212020
Collection$97,469 $94,561 
Disposal37,853 38,625 
Power generation1,303 1,026 
Processing1,484 1,137 
Solid waste operations138,109 135,349 
Processing17,272 13,818 
Non-processing34,151 33,743 
Resource solutions operations51,423 47,561 
Total revenues$189,532 $182,910