GOODWILL AND OTHER INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill for the years ended December 31, 2019 and 2018 were as follows (in thousands):



	Environmental Services			Safety-Kleen			Totals
Balance at January 1, 2018	$	172,386		$	306,137		$	478,523
Increase from current period acquisitions	37,007			3,697			40,704
Measurement period adjustments from prior period acquisitions	(78		)	—			(78		)
Decrease from disposition of business	—			—			—
Foreign currency translation	(2,296		)	(2,664		)	(4,960		)
Balance at December 31, 2018	$	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

The Company conducted its annual impairment test of goodwill as of December 31, 2019 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 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, 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, 2019 and 2018, the Company's finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):



	December 31, 2019						December 31, 2018
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	184,235	$	87,228	$	97,007	$	177,583	$	79,358	$	98,225
Customer and supplier relationships	401,696		207,884		193,812		393,487		179,824		213,663
Other intangible assets	38,331		33,018		5,313		37,262		29,743		7,519
Total amortizable permits and other intangible assets	624,262		328,130		296,132		608,332		288,925		319,407
Trademarks and trade names	122,934		—		122,934		122,468		—		122,468
Total permits and other intangible assets	$	747,196	$	328,130	$	419,066	$	730,800	$	288,925	$	441,875

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 year ended and as of December 31, 2019, 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, future impairments may become evident.

Amortization expense of permits and other intangible assets for the years ended December 31, 2019, 2018 and 2017 were $35.2 million, $34.4 million and $37.0 million, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at December 31, 2019 is as follows (in thousands):



Years ending December 31,	Expected Amortization
2020	$	33,083
2021	29,788
2022	29,534
2023	25,306
2024	23,921
Thereafter	154,500
	$	296,132