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ASSET RETIREMENT OBLIGATIONS - Schedule of Roll-Forward Activity (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Change in asset retirement obligations    
Balance as of December 31, 2021 $ 225,315  
Additional liabilities incurred 2,072  
Accretion expense 8,102  
Liabilities settled (8,385)  
Balance as of June 30, 2022 227,104  
Current portion 24,000 $ 24,000
Long-term portion $ 203,104 $ 201,315