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Impairment (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Impaired Intangible Assets
The following table summarizes the allocation to the Asset Group of the Impairment Charge of $26.1 million recorded as of June 30, 2020:
(in thousands)
Property, plant and equipment, net$18,986 
Intangible assets, net1,445 
Other long-term assets, net5,672 
Total impairment$26,103