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(Loss) Earnings per Share - Calculation of Weighted Average Common Shares Outstanding used in Computation of Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									9 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Oct. 01, 2016	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
(Loss) Earnings Per Share, Basic (in dollars per share)	$ 1.53	$ 0.33	$ (0.97)	$ (1.18)	$ (0.54)	$ (0.25)	$ 0.69	$ 1.90
Effect of dilutive securities
(Loss) Earnings Per Share, Diluted (in dollars per share)	$ 1.53	$ 0.33	$ (0.97)	$ (1.18)	$ (0.54)	$ (0.25)	$ 0.69	$ 1.90
Successor
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net (Loss) Income									$ (333,982)		$ (9,075)	$ 47,062
Weighted Average Shares, basic (in shares)									18,967,000		35,057,000	32,442,000
(Loss) Earnings Per Share, Basic (in dollars per share)									$ (17.61)		$ (0.26)	$ 1.45
Effect of dilutive securities
Net (Loss) Income, Restricted stock									$ 0		$ 0	$ 0
Weighted Average Shares, Restricted stock awards (in shares)									0		0	221,000
Net (Loss) Income, Performance share units											$ 0	$ 0
Weighted Average Shares, Performance share units (in shares)											0	0
Net (Loss) Income, Warrants									$ 0		$ 0	$ 0
Weighted Average Shares, Warrants (in shares)									0		0	0
Net (Loss) Income, Convertible notes									$ 0
Weighted Average Shares, Convertible notes (in shares)									0
Net (Loss) Income, Diluted									$ (333,982)		$ (9,075)	$ 47,062
Weighted Average Shares, Diluted (in shares)									18,967,000		35,057,000	32,663,000
(Loss) Earnings Per Share, Diluted (in dollars per share)									$ (17.61)		$ (0.26)	$ 1.44
Successor | Warrants
Effect of dilutive securities
Antidilutive securities excluded from computation of earnings per share (in shares)									0		0	0
Successor | Performance Share Units
Effect of dilutive securities
Antidilutive securities excluded from computation of earnings per share (in shares)											0	0
Successor | Restricted Stock
Effect of dilutive securities
Antidilutive securities excluded from computation of earnings per share (in shares)									0		0
Successor | New Convertible Notes
Effect of dilutive securities
Antidilutive securities excluded from computation of earnings per share (in shares)									14,600,000
Predecessor
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net (Loss) Income										$ 1,424,476
Weighted Average Shares, basic (in shares)										708,928,000
(Loss) Earnings Per Share, Basic (in dollars per share)										$ 2.01
Effect of dilutive securities
Net (Loss) Income, Restricted stock										$ 0
Weighted Average Shares, Restricted stock awards (in shares)										0
Net (Loss) Income, Diluted										$ 1,424,476
Weighted Average Shares, Diluted (in shares)										708,928,000
(Loss) Earnings Per Share, Diluted (in dollars per share)										$ 2.01
Predecessor | Restricted Stock
Effect of dilutive securities
Antidilutive securities excluded from computation of earnings per share (in shares)										0

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