Fresh Start Accounting (Accumulated Deficit Adjustments) (Details 8) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Sep. 18, 2020
Fresh-Start Adjustment [Line Items]
Accumulated deficit	$ 5,344	$ (50,658)
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	$ 5,344	$ (50,658)
Reorganization Adjustments
Fresh-Start Adjustment [Line Items]
Accumulated deficit			3,639,409
Net impact to Predecessor accumulated deficit			$ 3,639,409