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Summary of Significant Accounting Policies Summary (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Reconciliation Of Enterprise Value To Estimated Reorganization Value | The following table reconciles the enterprise value to the estimated reorganization value as of the Emergence Date (in thousands):
Enterprise value |  | $ | 1,089,808
Plus: cash and cash equivalents |  | 563,372
Plus: other working capital liabilities |  | 131,766
Plus: other long-term liabilities |  | 8,549
Reorganization value of Successor assets |  | $ | 1,793,495
Reorganization Items | The following table summarizes reorganization items for the Predecessor 2016 Period (in thousands):
Unamortized long-term debt |  | $ | 3,546,847
Litigation claims |  | (20,478)
Rejections and cures of executory contracts |  | (16,038)
Ad valorem and franchise taxes |  | (3,494)
Legal and professional fees and expenses |  | (44,920)
Write off of director and officer insurance policy |  | (7,533)
Gain on accounts payable settlements |  | 84,228
Loss on mortgage |  | (8,153)
Gain on preferred stock dividends |  | 37,893
Fresh start valuation adjustments |  | (28,549)
Fair value of equity issued |  | (827,424)
Principal value of Convertible Notes issued |  | (281,780)
Gain on reorganization items, net |  | $ | 2,430,599
Schedules of Concentration of Risk | The Company had sales exceeding 10% of total revenues to the following oil and natural gas purchasers (in thousands):
| Sales |  | % of Revenue
December 31, 2018 - Successor |  |  |
Targa Midstream Services L.P. | $ | 126,548 |  | 36.2 | %
Plains Marketing, L.P. | $ | 102,182 |  | 29.2 | %
Sinclair Crude Company | $ | 62,623 |  | 17.9 | %
December 31, 2017 - Successor |  |  |
Targa Pipeline Mid-Continent West OK LLC | $ | 144,583 |  | 40.5 | %
Plains Marketing, L.P. | $ | 117,927 |  | 33.0 | %
Period from October 2, 2016 through December 31, 2016 - Successor |  |  |
Targa Pipeline Mid-Continent West OK LLC | $ | 35,845 |  | 36.4 | %
Plains Marketing, L.P. | $ | 32,022 |  | 32.5 | %
Period from January 1, 2016 through October 1, 2016 - Predecessor |  |  |
Plains Marketing, L.P. | $ | 110,370 |  | 37.6 | %
Targa Pipeline Mid-Continent West OK LLC | $ | 108,238 |  | 36.8 | %

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