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Supplemental Disclosures to the Financial Statements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Deferred financing costs, net of amortization $ 9,000   $ 9,000   $ 11,000
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Asset retirement obligation, noncurrent 137,800   137,800   124,019
Asset retirement obligation, accretion expense     5,000    
Asset retirement obligation, liabilities incurred     6,000    
Asset retirement obligation, current 13,700   13,700   25,208
Asset retirement obligation, liabilities settled     (9,000)    
Greenhouse gas liabilities, non-current 31,000   31,000   $ 33,000
Other operating income (expense) 1,192 $ (3,119) (1,010) $ (4,364)  
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)