Fresh Start Accounting (Successor's Common Stock and Additional Paid-In Capital) (Details 7) $ in Thousands	Sep. 18, 2020 USD ($)
Reorganizations [Abstract]
Capital in excess of par value of 47, 499,999 issued and outstanding shares of New Common Stock issued to holders of the senior secured second lien note claims	$ 1,014,608
Capital in excess of par value of 2,500,000 issued and outstanding shares of New Common Stock issued to holders of the convertible senior note claims	53,400
Fair value of series A warrants issued to convertible senior note holders	15,683
Fair value of series B warrants issued to senior subordinated note holders	6,398
Fair value of series B warrants issued to Predecessor equity holders	5,330
Total change in Successor common stock and additional paid-in capital	1,095,419
Less: Par value of Successor common stock	(50)
Change in Successor additional paid-in capital	$ 1,095,369