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Other long-term liabilities - Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Opening balance $ 142,147 $ 79,968
Obligation assumed 793 57,067
Retirement activities (27,980) (4,133)
Accretion 4,589 4,381
Change in cash flow estimates (2,965) 4,864
Closing balance $ 116,584 $ 142,147