Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Apr. 22, 2016	Jun. 30, 2016	Jun. 30, 2015	Apr. 22, 2016	Jun. 30, 2015
Predecessor [Member]
Basic EPS:
Net Income (Loss)	$ 959,913		$ (292,867)	$ 851,611	$ (769,944)
Income, share amounts	44,754		44,516	44,692	44,374
Earnings Per Share, Basic	$ 21.45		$ (6.58)	$ 19.06	$ (17.35)
Dilutive Securities:
Dilutive RSA's, Shares	894		0	1,005	0
Dilutive RSU's, Shares	0		0	0	0
Diluted EPS:
Net Income (Loss) Available to Common Stockholders, Diluted	$ 959,913		$ (292,867)	$ 851,611	$ (769,944)
Weighted Average Number of Shares Outstanding, Diluted	45,648		44,516	45,697	44,374
Earnings Per Share, Diluted	$ 21.03		$ (6.58)	$ 18.64	$ (17.35)
Predecessor [Member] | Stock Options [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	1,200		1,300	1,300	1,300
Predecessor [Member] | Restricted Stock [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	300		700	300	700
Predecessor [Member] | Restricted Stock Units (RSUs) [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	800		1,200	800	1,200
Successor [Member]
Basic EPS:
Net Income (Loss)		$ (149,601)
Income, share amounts		10,000
Earnings Per Share, Basic		$ (14.96)
Dilutive Securities:
Dilutive RSA's, Shares		0
Dilutive RSU's, Shares		0
Diluted EPS:
Net Income (Loss) Available to Common Stockholders, Diluted		$ (149,601)
Weighted Average Number of Shares Outstanding, Diluted		10,000
Earnings Per Share, Diluted		$ (14.96)