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ASSET RETIREMENT OBLIGATIONS - Schedule of Roll-Forward Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Change in asset retirement obligations    
Balance as of December 31, 2021 $ 225,315  
Additional liabilities incurred 1,748  
Accretion expense 4,019  
Liabilities settled (5,131)  
Balance as of March 31, 2022 225,951  
Current portion 24,000 $ 24,000
Long-term portion $ 201,951 $ 201,315