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Reclamation (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
In thousands2020201920202019
Asset retirement obligation - Beginning$136,628  $135,741  $134,543  $133,508  
Accretion2,863  2,959  5,667  5,854  
Settlements(587) (1,155) (1,306) (1,817) 
Asset retirement obligation - Ending$138,904  $137,545  $138,904  $137,545