Earnings (Loss) Per Common Share (Weighted Average Number of Shares) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended								9 Months Ended	12 Months Ended
	Oct. 01, 2016	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Oct. 01, 2016	Dec. 31, 2015	Dec. 31, 2014
Predecessor [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 1,676,091		$ (51,421)	$ (175,887)	$ (206,702)	$ (632,368)	$ (1,999,476)	$ (168,103)	$ (113,195)	$ 1,242,081	$ (2,913,142)	$ (558,353)
Less: earnings allocated to participating securities										0	0	0
Net income (loss) attributable to common shareholders, after earnings allocated to participating securities										$ 1,242,081	$ (2,913,142)	$ (558,353)
Basic weighted average shares outstanding										21,293	21,285	21,222
Effect of dilutive securities										20	0	0
Diluted weighted average shares outstanding										21,313	21,285	21,222
Successor [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)		$ 33,449
Less: earnings allocated to participating securities		(217)
Net income (loss) attributable to common shareholders, after earnings allocated to participating securities		$ 33,232
Basic weighted average shares outstanding		25,002
Effect of dilutive securities		467
Diluted weighted average shares outstanding		25,469