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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
The Company’s goodwill and intangible assets consist of the following:
 September 30, 2020December 31, 2019
 Gross Carrying AmountAccumulated
Amortization		Gross Carrying AmountAccumulated
Amortization
Definite-lived intangibles:
Customer relationships$78,942 $(28,859)$78,942 $(22,938)
Technology2,003 (501)2,003 (351)
Non-compete and other agreements289 (289)289 (253)
SCB trade name694 (503)694 (243)
Rail easement110 (110)110 (110)
Total$82,038 $(30,262)$82,038 $(23,895)
Indefinite-lived intangibles:
Charah trade name$34,330 $34,330 
Goodwill74,213 74,213 
Total$108,543 $108,543 
Schedule Of Finite Lived Intangible Assets, Estimated Useful Life
As of September 30, 2020 and December 31, 2019, definite-lived intangible assets included customer relationships, technology, non-compete and other agreements, the SCB trade name and a rail easement. These assets are amortized on a straight-line basis over their estimated useful lives as shown in the table below. Amortization expense of definite-lived intangibles was $2,215 and $2,094 during the three months ended September 30, 2020 and 2019, respectively, and $6,367 and $6,305 during the nine months ended September 30, 2020 and 2019, respectively.
Definite-Lived Intangible AssetUseful Life
Customer relationships10 years
Technology10 years
Non-compete and other agreements2 years
SCB trade name3 years
Rail easement2 years
Schedule Of Sensitivity Analysis Of Impact To Estimated Fair Values The table below provides, in isolation, the estimated fair value impacts related to (i) a 50-basis point increase to the discount rate assumption and (ii) a 75-basis point decrease to our shorter-term revenue and residual growth rates assumptions, both of which would result in impairment charges.
Approximate Percent Decrease in Estimated Fair Value
+50 bps Discount Rate-75 bps Growth Rate
Environmental Solutions reporting unit6.3 %7.9 %