SEGMENT REPORTING (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Summary of Segment Reporting Information by Segment

Three Months Ended September 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	75,154	$	18,768	$	9,407	$	5,374	$	352,067
Western	103,523		35,523		15,710		15,805		673,608
Resource solutions	63,292		156		1,903		6,679		126,529
Corporate entities	—		—		471		(471)		128,193
Eliminations	—		(54,447)		—		—		—
	$	241,969	$	—	$	27,491	$	27,387	$	1,280,397

Three Months Ended September 30, 2020

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	58,323	$	14,261	$	6,659	$	3,683	$	215,639
Western	94,728		31,692		15,000		15,344		635,153
Resource solutions	49,616		2,806		1,544		2,204		89,870
Corporate entities	—		—		596		(598)		53,593
Eliminations	—		(48,759)		—		—		—
	$	202,667	$	—	$	23,799	$	20,633	$	994,255

Nine Months Ended September 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	188,557	$	47,322	$	23,342	$	11,401	$	352,067
Western	288,139		97,771		44,838		38,462		673,608
Resource solutions	170,679		3,337		5,020		12,792		126,529
Corporate entities	—		—		1,310		(1,312)		128,193
Eliminations	—		(148,430)		—		—		—
	$	647,375	$	—	$	74,510	$	61,343	$	1,280,397

Nine Months Ended September 30, 2020

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	161,803	$	39,936	$	18,956	$	9,023	$	215,639
Western	267,218		86,259		41,847		32,849		635,153
Resource solutions	145,323		8,147		4,692		5,008		89,870
Corporate entities	—		—		1,786		(1,791)		53,593
Eliminations	—		(134,342)		—		—		—
	$	574,344	$	—	$	67,281	$	45,089	$	994,255

Summary of Revenue Attributable to Services

A summary of our revenues attributable to services provided follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Collection	$	118,872	$	102,270	$	323,667	$	290,837
Disposal	55,593		47,600		142,618		129,971
Power generation	1,253		987		3,657		2,931
Processing	2,959		2,194		6,754		5,282
Solid waste operations	178,677		153,051		476,696		429,021
Processing	27,418		15,701		65,721		45,724
Non-processing	35,874		33,915		104,958		99,599
Resource solutions operations	63,292		49,616		170,679		145,323
Total revenues	$	241,969	$	202,667	$	647,375	$	574,344