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Income Taxes - Reconciliation of (Benefit) Provision for Income Taxes at Statutory Federal Tax Rate to Company's Actual Income Tax (Benefit) Provision (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Dec. 31, 2018	Dec. 31, 2017
Successor
Reconciliation Of Provision Of Income Taxes [Line Items]
Computed at federal statutory rate	$ (116,891)		$ (1,921)	$ 13,409
State taxes, net of federal benefit	(3,696)		119	(284)
Non-deductible expenses	144		849	1,711
Non-deductible debt costs	0		0	0
Stock-based compensation	306		1,874	1,109
Discharge of debt and other reorganization related items	0		206	1,018
Return to provision adjustments	0		(1,292)	341,681
Impact of legislative changes	0		0	243,801
Release of valuation allowance	0		0	(8,719)
Change in valuation allowance	120,144		132	(602,452)
Other	2		(38)	(23)
Total (benefit) provision	$ 9		$ (71)	$ (8,749)
Predecessor
Reconciliation Of Provision Of Income Taxes [Line Items]
Computed at federal statutory rate		$ 504,283
State taxes, net of federal benefit		10,512
Non-deductible expenses		462
Non-deductible debt costs		22,694
Stock-based compensation		5,884
Discharge of debt and other reorganization related items		359,278
Return to provision adjustments		0
Impact of legislative changes		0
Release of valuation allowance		0
Change in valuation allowance		(903,102)
Other		0
Total (benefit) provision		$ 11

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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