Income Taxes - Components of Predecessor's Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Federal, State and Local, Tax Expense (Benefit) [Abstract]
Deferred Income Tax Expense (Benefit)	$ 0	$ 5,240	$ 788
Total income tax expense	$ 0	22,858	24,857
Predecessor
Current Federal, State and Local, Tax Expense (Benefit) [Abstract]
Federal		15,571	21,272
State		2,047	2,797
Current Income Tax Expense (Benefit)		17,618	24,069
Deferred Federal, State and Local, Tax Expense (Benefit) [Abstract]
Federal		4,631	772
State		609	16
Deferred Income Tax Expense (Benefit)		5,240	788
Total income tax expense		$ 22,858	$ 24,857