Employee Benefit Plans (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended		12 Months Ended
	Dec. 31, 2020	Aug. 31, 2020		Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Recognized stock compensation expense		$ 6,100	[1]	$ 12,800
Deferred compensation plan	$ 0			$ 6,180
Employee Thrift Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution of shares, common stock				310,797
Recognized stock compensation expense	700	1,400		$ 5,200
Separation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Separation benefit plans expense	$ 1,400	$ 18,100		$ 3,800

[1] When the company's equity-based awards were cancelled on the Effective Date, we immediately recognized the expense for the cancelled awards of $1.4 million as reorganization costs, net.