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Reclamation (Tables)
 9 Months Ended
Sep. 30, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Changes to the Company’s asset retirement obligations for its operating sites are as follows:
Three Months Ended September 30,Nine Months Ended September 30,
In thousands2024202320242023
Asset retirement obligation - Beginning$219,917 $207,960 $214,013 $202,431 
Accretion4,233 4,153 12,463 12,219 
Additions and changes to estimates— (2,682)— (2,682)
Settlements(2,060)(1,415)(4,386)(3,952)
Asset retirement obligation - Ending$222,090 $208,016 $222,090 $208,016