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Divestitures and Discontinued Operations - Discontinued Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Loss from discontinued operations, net of income taxes $ 0 $ (180,568) $ 0 $ (179,466)
Natural Gas Storage Assets | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Total revenues   11,902   22,836
Total costs and expenses and other, net, excluding depreciation and amortization   (9,609)   (15,360)
Depreciation and amortization   (4,080)   (8,161)
Other operating loss   (178,781)   (178,781)
Loss from discontinued operations before income taxes   (180,568)   (179,466)
Income tax expense   0   0
Loss from discontinued operations, net of income taxes   $ (180,568)   $ (179,466)