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CHAPTER 11 PROCEEDINGS (Company's Audited Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
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Reorganizations [Abstract] |  |  |
Debt subject to compromise | $ 2,003,004 | $ 2,005,219 |
Accounts payable and accrued liabilities | 134,344 | 164,939 |
Asset retirement obligations | 64,854 | 63,566 | $ 0
Accrued interest on debt subject to compromise | 55,159 | 55,634 |
Other liabilities | 4,092 | 4,122 |
Liabilities subject to compromise | $ 2,261,453 | $ 2,293,480 |

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