Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Preferred Stock	Paid-In Capital	Other Comprehensive Income (Loss)	Accumulated deficit/Retained earnings
Beginning balance (Predecessor) at Dec. 31, 2017	$ (248,935)	$ 26	$ 1	$ 313,244	$ 278	$ (562,484)
Beginning balance at Dec. 31, 2017					278
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares | Predecessor	(11)	0		(11)	0
Share-based compensation expense | Predecessor	361			361	0
Issuance of shares under employee stock purchase plan | Predecessor	43			43	0
Derivative fair value adjustment, net of tax | Predecessor	(1,055)					(59)
Preferred stock dividend | Predecessor	(1,285)					(1,285)
Net income (loss) | Predecessor	(927)					(927)
Ending balance (Predecessor) at Mar. 31, 2018	(251,809)	26	1	313,637	(718)	(564,755)
Ending balance at Mar. 31, 2018					(718)
Beginning balance (Predecessor) at Dec. 31, 2018	(262,167)	26	1	314,268	0	(576,462)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares | Predecessor	72,841	92	0	72,749	0	0
Share-based compensation expense | Predecessor	44			44	0
Issuance of Successor common stock upon vesting of restricted stock, net of shares retired for taxes | Predecessor	859	2		857	0
Net income (loss) | Predecessor	261,727					261,727
Cancellation of Predecessor equity | Predecessor	396	(26)	(1)	(314,312)	0	314,735
Ending balance (Predecessor) at Feb. 08, 2019	73,700	94	0	73,606	0	0
Ending balance at Feb. 08, 2019	73,700	94	0	73,606	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	366			366	0
Net income (loss)	737					737
Ending balance at Mar. 31, 2019	$ 74,803	$ 94	$ 0	$ 73,972	$ 0	$ 737