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FRESH START ACCOUNTING (Reconciliation of Enterprise Value and Reorganization Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	May 17, 2021	May 16, 2021	Dec. 31, 2020
Reorganizations [Abstract]
Enterprise Value		$ 1,600,000
Plus: Cash and cash equivalents	$ 9,389	1,526		$ 89,861
Less: Fair value of debt		(852,751)
Successor equity value		748,775
Enterprise Value		1,600,000
Mezzanine equity	55,860	55,000
Plus: Current and other liabilities		686,489
Plus: Asset retirement obligations	$ 19,347	19,084		$ 0
Less: Common stock reserved for settlement of claims post Emergence Date		(54,109)
Reorganization value of Successor assets		$ 2,252,990	$ 2,300,000

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