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Supplemental Disclosures to the Financial Statements - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Deferred financing costs, net of amortization   $ 8,000   $ 8,000   $ 11,000
Asset retirement obligation, noncurrent   136,392   136,392   124,019
Asset retirement obligation, accretion expense       7,000    
Asset retirement obligation, liabilities incurred $ 6,000     6,000    
Asset retirement obligation, current   13,700   13,700   25,208
Asset retirement obligation, liabilities settled       12,000    
Greenhouse gas liabilities, non-current   35,000   35,000   $ 33,000
Other operating income (expense)   (1,648) $ 550 (2,658) $ (3,814)  
Adjustment            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Asset retirement obligation, noncurrent   12,000   12,000    
Asset retirement obligation, current   $ (12,000)   $ (12,000)