GOODWILL AND INTANGIBLE ASSETS

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

A summary of the activity and balances related to goodwill by reporting segment is as follows:


	December 31, 2018		Acquisitions		Other (1)		September 30, 2019
Eastern region	$	28,154	$	2,566	$	—	$	30,720
Western region	120,536		21,614		(2,619)		139,531
Recycling	12,315		—		—		12,315
Other	1,729		—		—		1,729
Total	$	162,734	$	24,180	$	(2,619)	$	184,295

(1)Relates to the unregistered sale of Class A common stock that was previously held in escrow and released to us for liquidation . See Note 10, Stockholders' Equity for additional disclosure.

A summary of intangible assets by intangible asset type follows:


	Covenants Not-to-Compete		Client Lists		Total
Balance, September 30, 2019
Intangible assets	$	26,162	$	71,122	$	97,284
Less accumulated amortization	(18,575)		(17,726)		(36,301)
	$	7,587	$	53,396	$	60,983


	Covenants Not-to-Compete		Client Lists		Total
Balance, December 31, 2018
Intangible assets	$	21,750	$	44,363	$	66,113
Less accumulated amortization	(17,584)		(13,762)		(31,346)
	$	4,166	$	30,601	$	34,767

Intangible amortization expense was 1,916 and 4,956 during the three and nine months ended September 30, 2019, respectively, as compared to $714 and $1,848 during the three and nine months ended September 30, 2018, respectively.

A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2018 and thereafter follows:



Estimated Future Amortization Expense as of September 30, 2019
Fiscal year ending December 31, 2019	$	2,264
Fiscal year ending December 31, 2020	$	8,222
Fiscal year ending December 31, 2021	$	6,826
Fiscal year ending December 31, 2022	$	6,188
Fiscal year ending December 31, 2023	$	5,993
Thereafter	$	31,490