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Fixed Assets and Asset Retirement Obligations (Schedule of Reconciliation of Liability for Asset Retirement Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Asset retirement obligations, beginning balance $ 220,906 $ 176,852
Accretion expense 13,092 10,038
Revisions in timing and estimated costs of AROs 11,216 35,735
Settlements   3,008
Settlements (16,641) (4,727)
Asset retirement obligations, ending balance $ 228,573 $ 220,906