Earnings Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator (both basic and diluted):
Net loss	$ (13,845)		$ (76,413)
Denominator:
Denominator for basic loss per share (in shares)	26,001,062		26,000,326
Denominator for diluted loss per share (in shares)	26,001,062		26,000,326
Basic loss per common share (in dollars per share)	$ (0.53)		$ (2.94)
Diluted loss per common share (in dollars per share)	$ (0.53)		$ (2.94)
Predecessor
Numerator (both basic and diluted):
Net loss		$ (92,097)		$ (265,319)
Denominator:
Denominator for basic loss per share (in shares)		42,689,773		41,957,755
Denominator for diluted loss per share (in shares)		42,689,773		41,957,755
Basic loss per common share (in dollars per share)		$ (2.16)		$ (6.32)
Diluted loss per common share (in dollars per share)		$ (2.16)		$ (6.32)