GOODWILL AND OTHER INTANGIBLE ASSETS

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill by segment for the three months ended March 31, 2021 were as follows (in thousands):


	Environmental Services		Safety-Kleen Sustainability Solutions		Totals
Balance at January 1, 2021	$	401,918	$	125,105	$	527,023
Increase from current period acquisition	—		15,875		15,875



Foreign currency translation	520		187		707
Balance at March 31, 2021	$	402,438	$	141,167	$	543,605

The balances in the table above have been recast to reflect the Company's segment change in the first quarter of 2021. As discussed in Note 17, "Segment Reporting," as a result of operational and managerial changes, the Company changed its operating segments in accordance with ASC 280, Segment Reporting. In addition, the Company concluded that, for purposes of reviewing for potential goodwill impairment, it now has three reporting units. The Environmental Services operating segment has two reporting units consisting of (i) Environmental Sales and Service which includes the legacy Environmental Sales and Service reporting unit and certain operations previously included within Safety-Kleen Environmental Services including the core service offerings of containerized waste, parts washer and vacuum services and (ii) Environmental Facilities, unchanged from prior year. The Safety-Kleen Sustainability Solutions operating segment is a single reporting unit which includes the legacy Safety-Kleen Oil reporting unit and the remaining operations of the legacy Safety-Kleen Environmental Services reporting unit primarily consisting of collection services for waste oil, anti-freeze and used oil filters as well as the sale of bulk blended re-refined oil and other automotive related finished fluid products. The Company allocated goodwill to the newly identified reporting units using a relative fair value approach. In addition, the Company completed an assessment of any potential goodwill impairment for all reporting units immediately prior and subsequent to the reallocation and determined that no impairment existed.

As of March 31, 2021 and December 31, 2020, the Company's intangible assets consisted of the following (in thousands):


	March 31, 2021						December 31, 2020
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	184,675	$	97,061	$	87,614	$	183,766	$	95,033	$	88,733
Customer and supplier relationships	372,860		207,929		164,931		382,083		211,895		170,188
Other intangible assets	39,334		35,107		4,227		39,287		34,744		4,543
Total amortizable permits and other intangible assets	596,869		340,097		256,772		605,136		341,672		263,464
Trademarks and trade names	123,281		—		123,281		123,156		—		123,156
Total permits and other intangible assets	$	720,150	$	340,097	$	380,053	$	728,292	$	341,672	$	386,620

Amortization expense of permits, customer and supplier relationships and other intangible assets was $7.6 million and $9.2 million in the three months ended March 31, 2021 and March 31, 2020, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at March 31, 2021 was as follows (in thousands):


Years Ending December 31,	Expected Amortization
2021 (nine months)	$	22,674
2022	30,013
2023	25,681
2024	24,183
2025	23,205
Thereafter	131,016
	$	256,772