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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table reflects the changes in carrying amounts of goodwill by each reporting unit for the years ended December 31, 2023 and 2022:
(In thousands)
Harsco Environmental
Clean Earth
Consolidated
Totals
Balance at December 31, 2021$399,230 $483,879 $883,109 
Goodwill impairment— (104,580)(104,580)
Foreign currency translation(19,276)— (19,276)
Balance at December 31, 2022379,954 379,299 759,253 
Foreign currency translation8,699 — 8,699 
Balance at December 31, 2023$388,653 $379,299 $767,952 
Schedule of Acquired Finite-Lived Intangible Assets by Major Class The following table reflects these intangible assets by major category:
December 31, 2023December 31, 2022
(In thousands)Gross Carrying
Amount		Accumulated
Amortization		Gross Carrying
Amount		Accumulated
Amortization
Customer related$97,963 $64,040 $95,573 $54,482 
Permits309,679 66,733 309,177 50,703 
Technology related21,803 17,001 20,800 15,491 
Trade names30,409 11,816 30,212 9,198 
Air rights26,139 3,281 26,139 2,411 
Patents206 178 189 155 
Non-compete agreement2,500 2,344 2,500 1,718 
Other3,063 1,508 3,147 1,419 
Total$491,762 $166,901 $487,737 $135,577 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense The following table shows the estimated amortization expense for the next five fiscal years based on current intangible assets.
(In thousands)20242025202620272028
Estimated amortization expense (a)
$28,000 $27,800 $25,900 $24,600 $23,000 
(a)    These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange rate fluctuations.