GOODWILL AND OTHER INTANGIBLE ASSETS

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill by segment for the nine months ended September 30, 2020 were as follows (in thousands):


	Environmental Services		Safety-Kleen		Totals
Balance at January 1, 2020	$	212,531	$	312,482	$	525,013
Increase from current period acquisition	—		1,440		1,440
Measurement period adjustments from prior period acquisitions	23		—		23
Decrease from disposition of businesses	(674)		—		(674)

Foreign currency translation	(741)		(800)		(1,541)
Balance at September 30, 2020	$	211,139	$	313,122	$	524,261

The Company assesses goodwill for impairment on an annual basis as of December 31 or at an interim date when events or changes in the business environment ("triggering events") would more likely than not reduce the fair value of a reporting unit below its carrying value. During the period ended September 30, 2020, the Company considered the effects of COVID-19 and evolving changes in demand and pricing for oil, but concluded that there were no triggering events requiring an impairment assessment. This conclusion was based on a qualitative analysis incorporating (i) the significant excess fair value that previously existed in each reporting unit and (ii) assessing the current and long-term performance of the Company given the expectation that these negative effects on the operations and cash flows of each reporting unit arising from COVID-19 related disruptions will be short-lived.

The Company continues to evaluate the impact of macroeconomic conditions including, but not limited to, the impact of the COVID-19 pandemic on the Company, customers and the greater economy as well as the impact on trends of oil demand. If these macroeconomic conditions are protracted or result in significant changes in demand for our products and services, a goodwill impairment might be identified and the amount might be material.

As of September 30, 2020 and December 31, 2019, the Company's intangible assets consisted of the following (in thousands):


	September 30, 2020						December 31, 2019
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	182,478	$	92,725	$	89,753	$	184,235	$	87,228	$	97,007
Customer and supplier relationships	388,862		213,700		175,162		401,696		207,884		193,812
Other intangible assets	38,153		33,334		4,819		38,331		33,018		5,313
Total amortizable permits and other intangible assets	609,493		339,759		269,734		624,262		328,130		296,132
Trademarks and trade names	122,667		—		122,667		122,934		—		122,934
Total permits and other intangible assets	$	732,160	$	339,759	$	392,401	$	747,196	$	328,130	$	419,066

Amortization expense of permits and other intangible assets was $9.6 million and $27.6 million in the three and nine months ended September 30, 2020, respectively. Amortization expense of permits and other intangible assets was $8.4 million and $26.6 million in the three and nine months ended September 30, 2019, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at September 30, 2020 was as follows (in thousands):


Years Ending December 31,	Expected Amortization
2020 (three months)	$	7,841
2021	29,997
2022	29,742
2023	25,482
2024	23,997
Thereafter	152,675
	$	269,734