GOODWILL AND OTHER INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill for the years ended December 31, 2020 and 2019 were as follows (in thousands):


	Environmental Services		Safety-Kleen		Totals
Balance at January 1, 2019	$	207,019	$	307,170	$	514,189
Increase from current period acquisitions	7,378		5,225		12,603
Measurement period adjustments from prior period acquisitions	(2,675)		(1,355)		(4,030)


Foreign currency translation	809		1,442		2,251
Balance at December 31, 2019	$	212,531	$	312,482	$	525,013
Increase from current period acquisition	—		1,439		1,439
Measurement period adjustments from prior period acquisitions	23		—		23
Decrease from disposition of businesses	(674)		—		(674)

Foreign currency translation	506		716		1,222
Balance at December 31, 2020	$	212,386	$	314,637	$	527,023

The Company regularly assesses goodwill for impairment when it is more likely than not that events or changes in the business environment ("triggering events") would reduce the fair value of a reporting unit below its carrying value. The Company considered the effects of COVID-19 and evolving changes in demand and pricing for oil during 2020 but concluded that there were no triggering events requiring an impairment assessment.

Goodwill impairment is also tested annually. The Company conducted its annual impairment test of goodwill as of December 31, 2020 and determined that no adjustment to the carrying value of goodwill for any reporting unit was then necessary because the fair values of the reporting units exceeded their respective carrying values. The fair value of all reporting units was determined using an income approach based upon estimates of future discounted cash flows. The resulting estimates of fair value were validated through the consideration of other factors such as the fair value of comparable companies to the reporting units and a reconciliation of the sum of all estimated fair values of the reporting units to the Company’s overall market capitalization. In all cases, the estimated fair values of the reporting units significantly exceeded the respective carrying values.

Significant judgments and unobservable inputs categorized as Level 3 in the fair value hierarchy are inherent in the impairment tests performed and include assumptions about the amount and timing of expected future cash flows, growth rates, and the determination of appropriate discount rates. Level 3 inputs are unobservable inputs for the asset or liability in which there is little, if any, market activity for the asset or liability at the measurement date. The Company believes that the assumptions used in its impairment tests are reasonable, but variations in any of the assumptions may result in different measurements of fair values.

The impacts of any adverse business and market conditions which may impact the overall performance of the Company's reporting units will continue to be monitored. If the Company's reporting units do not achieve the financial performance that the Company expects, or if the impact of the COVID-19 pandemic and macroeconomic factors on the Company and its customers result in significant prolonged changes in demand for our products and services, it is possible that goodwill impairment charges may result. There can therefore be no assurance that future events will not result in an impairment of goodwill.

As of December 31, 2020 and 2019, the Company's finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):


	December 31, 2020						December 31, 2019
	Cost		Accumulated Amortization		Net			Cost		Accumulated Amortization		Net
Permits	$	183,766	$	95,033	$	88,733		$	184,235	$	87,228	$	97,007
Customer and supplier relationships	382,083		211,895		170,188			401,696		207,884		193,812
Other intangible assets	39,287		34,744		4,543			38,331		33,018		5,313
Total amortizable permits and other intangible assets	605,136		341,672		263,464			624,262		328,130		296,132
Trademarks and trade names	123,156		—		123,156			122,934		—		122,934
Total permits and other intangible assets	$	728,292	$	341,672	$	386,620		$	747,196	$	328,130	$	419,066

The Company regularly monitors and assesses whether events or changes in circumstances relative to the Company's business might indicate that future cash flows attributable to the Company's asset groups may not be sufficient to recover the current value of those assets. During the periods presented, there were no events or changes in circumstances which would indicate that the carrying values of the Company's asset groups would not be recoverable and thus no impairment charge was recorded related to the Company's long-lived assets. If expectations of future cash flows were to decrease in the future as a result of worse than expected or prolonged periods of depressed activity, including prolonged macroeconomic impacts from the COVID-19 pandemic as noted above, future impairments may become evident.

Amortization expense of permits and other intangible assets for the years ended December 31, 2020, 2019 and 2018 were $35.8 million, $35.2 million and $34.4 million, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at December 31, 2020 is as follows (in thousands):


Years ending December 31,	Expected Amortization
2021	$	30,163
2022	29,911
2023	25,587
2024	24,092
2025	23,121
Thereafter	130,590
	$	263,464