Emergence from Voluntary Reorganization under Chapter 11 / Fresh Start Accounting Fresh Start Accounting (Details) $ in Thousands	May 31, 2020 USD ($)
Minimum [Member]
Fresh-Start Adjustment [Line Items]
Enterprise Value, Original Estimate	$ 275,000
Enterprise Value, Revised Estimate	249,000
Maximum [Member]
Fresh-Start Adjustment [Line Items]
Enterprise Value, Original Estimate	335,000
Enterprise Value, Revised Estimate	303,000
Median [Member]
Fresh-Start Adjustment [Line Items]
Enterprise Value, Original Estimate	305,000
Enterprise Value, Revised Estimate	$ 276,000