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Reclamation (Tables)
 9 Months Ended
Sep. 30, 2020
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 thousands2020201920202019
Asset retirement obligation - Beginning$138,904 $137,545 $134,543 $133,508 
Accretion2,924 3,024 8,591 8,878 
Settlements(930)(833)(2,236)(2,650)
Asset retirement obligation - Ending$140,898 $139,736 $140,898 $139,736