Fresh Start Accounting (Accumulated Deficit Adjustments) (Details 8) $ in Thousands	Sep. 18, 2020 USD ($)
Reorganizations [Abstract]
Cancellation of Predecessor common stock, paid-in capital in excess of par, and treasury stock	$ 2,763,824
Gain on settlement of liabilities subject to compromise	1,024,864
Acceleration of Predecessor stock compensation expense	(4,601)
Recognition of tax expenses related to reorganization adjustments	(128,556)
Professional service provider fees recognized at emergence	(9,700)
Issuance of series B warrants to Predecessor equity holders	(5,330)
Other	(1,092)
Net impact to Predecessor accumulated deficit	$ 3,639,409