Net Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator (both basic and diluted):
Net loss available to common stockholders									$ (96,674)
Denominator:
Denominator for basic earnings per share (in shares)	26,049,000	26,001,000	26,011,000	25,999,000					26,005,870
Denominator for diluted earnings per share (in shares)	26,049,000	26,001,000	26,011,000	25,999,000					26,005,870		40,505,429
Basic loss per common share (in dollars per share)	$ (0.78)	$ (0.53)	$ (0.92)	$ (1.49)					$ (3.72)
Diluted loss per common share (in dollars per share)	$ (0.78)	$ (0.53)	$ (0.92)	$ (1.49)					$ (3.72)
Predecessor
Numerator (both basic and diluted):
Net loss available to common stockholders										$ (123,373)	$ (241,745)
Denominator:
Denominator for basic earnings per share (in shares)					42,691,000	42,690,000	42,602,000	41,609,000		41,998,669	40,505,429
Denominator for diluted earnings per share (in shares)					42,691,000	42,690,000	42,602,000	41,609,000		41,998,669
Basic loss per common share (in dollars per share)					$ 3.32	$ (2.16)	$ (2.11)	$ (2.00)		$ (2.94)	$ (5.97)
Diluted loss per common share (in dollars per share)					$ 3.32	$ (2.16)	$ (2.11)	$ (2.00)		$ (2.94)	$ (5.97)