Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 22, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Predecessor [Member]
Basic EPS:
Net Income (Loss)	$ 851,611		$ (1,653,971)	$ (283,427)
Income, Share Amounts	44,692		44,463	43,795
Earnings (Loss) Per Share, Basic	$ 19.06		$ (37.20)	$ (6.47)
Dilutive Securities:
Dilutive RSA's, Shares	1,005		0	0
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares	0		0	0
Contingently Issuable Shares Not Included in Diluted EPS	0		0	0
Diluted EPS:
Net Income (Loss) Available to Common Stockholders, Diluted	$ 851,611		$ (1,653,971)	$ (283,427)
Weighted Average Number of Shares Outstanding, Diluted	45,697		44,463	43,795
Earnings (Loss) Per Share, Diluted	$ 18.64		$ (37.20)	$ (6.47)
Predecessor [Member] | Stock Options [Member]
Earnings Per Share (Textual) [Abstract]
Antidilutive shares not included in the computation of diluted EPS	1,300		1,300	1,400
Predecessor [Member] | Restricted Stock Awards [Member]
Earnings Per Share (Textual) [Abstract]
Antidilutive shares not included in the computation of diluted EPS	300		500	500
Predecessor [Member] | Restricted Stock Units (RSUs) [Member]
Earnings Per Share (Textual) [Abstract]
Antidilutive shares not included in the computation of diluted EPS	800		600	400
Successor [Member]
Basic EPS:
Net Income (Loss)		$ (156,288)
Income, Share Amounts		10,013
Earnings (Loss) Per Share, Basic		$ (15.61)
Dilutive Securities:
Dilutive RSA's, Shares		0
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares		0
Contingently Issuable Shares Not Included in Diluted EPS		0
Diluted EPS:
Net Income (Loss) Available to Common Stockholders, Diluted		$ (156,288)
Weighted Average Number of Shares Outstanding, Diluted		10,013
Earnings (Loss) Per Share, Diluted		$ (15.61)
Successor [Member] | Stock Options [Member]
Earnings Per Share (Textual) [Abstract]
Antidilutive shares not included in the computation of diluted EPS		100
Successor [Member] | Restricted Stock Units (RSUs) [Member]
Earnings Per Share (Textual) [Abstract]
Antidilutive shares not included in the computation of diluted EPS		200