Consolidated Statement of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands		Treasury Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Total
Balance (Predecessor Company [Member]) at Dec. 31, 2011		$ (11,361)	$ 40	$ 505,235	$ (2,869)	$ 491,045
Balance, shares (Predecessor Company [Member]) at Dec. 31, 2011		922	40,326
Net income (loss) | Predecessor Company [Member]					58,810	58,810
Stock option and restricted share awards | Predecessor Company [Member]				4,717		4,717
Stock option and restricted share awards, shares | Predecessor Company [Member]			226
Exercise of stock options | Predecessor Company [Member]				441		441
Exercise of stock options, shares | Predecessor Company [Member]			48
Purchase of shares into treasury | Predecessor Company [Member]		$ (8,798)				(8,798)
Purchase of shares into treasury, shares | Predecessor Company [Member]		549
Restricted Stock used for tax withholding | Predecessor Company [Member]		$ (318)				(318)
Restricted Stock used for tax withholding, shares | Predecessor Company [Member]		28
Other | Predecessor Company [Member]				76		76
Other, shares | Predecessor Company [Member]			2
Balance (Predecessor Company [Member]) at Dec. 31, 2012		$ (20,477)	$ 40	510,469	55,941	545,973
Balance, shares (Predecessor Company [Member]) at Dec. 31, 2012		1,499	40,602
Net income (loss) | Predecessor Company [Member]					85,274	85,274
Stock option and restricted share awards | Predecessor Company [Member]				7,344		7,344
Stock option and restricted share awards, shares | Predecessor Company [Member]		2	258
Exercise of stock options | Predecessor Company [Member]			$ 1	1,384		1,385
Exercise of stock options, shares | Predecessor Company [Member]			108
Purchase of shares into treasury | Predecessor Company [Member]		$ (9,640)				(9,640)
Purchase of shares into treasury, shares | Predecessor Company [Member]		334
Restricted Stock used for tax withholding | Predecessor Company [Member]		$ (1,040)				(1,040)
Restricted Stock used for tax withholding, shares | Predecessor Company [Member]		38
Other | Predecessor Company [Member]				(83)		(83)
Other, shares | Predecessor Company [Member]			2
Balance (Predecessor Company [Member]) at Dec. 31, 2013		$ (31,157)	$ 41	519,114	141,215	629,213
Balance, shares (Predecessor Company [Member]) at Dec. 31, 2013		1,873	40,970
Net income (loss) | Predecessor Company [Member]					(22,956)	(22,956)
Net income (loss)						(22,956)
Stock option and restricted share awards | Predecessor Company [Member]				11,456		11,456
Stock option and restricted share awards, shares | Predecessor Company [Member]			162
Exercise of stock options | Predecessor Company [Member]				8,248		8,248
Restricted Stock used for tax withholding | Predecessor Company [Member]		$ (7,637)				(7,637)
Restricted Stock used for tax withholding, shares | Predecessor Company [Member]		208
Other | Predecessor Company [Member]				26		26
Other, shares | Predecessor Company [Member]			1
Balance (Predecessor Company [Member]) at Jun. 03, 2014		$ (38,794)	$ 41	538,844	118,259	618,350
Balance (Successor Company [Member]) at Jun. 03, 2014						1,504,341
Balance, shares (Predecessor Company [Member]) at Jun. 03, 2014		2,081	41,133
Pushdown adjustments | Successor Company [Member]		$ 38,794	$ (41)	965,497	(118,259)	885,991
Pushdown adjustments, shares | Successor Company [Member]		(2,081)	(41,132)
Net income (loss) | Successor Company [Member]					373	373
Net income (loss)						373
Capital contribution from EGC | Successor Company [Member]				95,000		95,000
Balance (Successor Company [Member]) at Jun. 30, 2014				1,599,341	373	1,599,714
Balance, shares (Successor Company [Member]) at Jun. 30, 2014			1
Net income (loss) | Successor Company [Member]						(306,356)
Net income (loss)	[1]					(306,356)
Balance (Successor Company [Member]) at Sep. 30, 2014						1,293,358
Balance (Successor Company [Member]) at Jun. 30, 2014				1,599,341	373	1,599,714
Balance, shares (Successor Company [Member]) at Jun. 30, 2014			1
Net income (loss) | Successor Company [Member]						(760,968)
Balance (Successor Company [Member]) at Dec. 31, 2014						838,746
Balance (Successor Company [Member]) at Jun. 30, 2014				1,599,341	373	1,599,714
Balance, shares (Successor Company [Member]) at Jun. 30, 2014			1
Net income (loss) | Successor Company [Member]						(1,056,601)
Balance (Successor Company [Member]) at Mar. 31, 2015						543,113
Balance (Successor Company [Member]) at Jun. 30, 2014				1,599,341	373	1,599,714
Balance, shares (Successor Company [Member]) at Jun. 30, 2014			1
Net income (loss) | Successor Company [Member]					(1,653,866)	(1,653,866)
Balance (Successor Company [Member]) at Jun. 30, 2015			$ 1	1,599,341	(1,653,493)	(54,152)
Balance (Successor Company [Member]) at Sep. 30, 2014						1,293,358
Net income (loss) | Successor Company [Member]						(454,612)
Net income (loss)	[2]					(454,612)
Balance (Successor Company [Member]) at Dec. 31, 2014						838,746
Net income (loss) | Successor Company [Member]						(295,633)
Net income (loss)	[3]					(295,633)
Balance (Successor Company [Member]) at Mar. 31, 2015						543,113
Net income (loss)	[4]					(597,265)
Balance (Successor Company [Member]) at Jun. 30, 2015			$ 1	$ 1,599,341	$ (1,653,493)	$ (54,152)

[1] Included in costs and expenses for the three months ended September 30, 2014 is goodwill impairment of $329.3 million.

[2] Included in costs and expenses for the three months ended December 31, 2014 is impairment of oil and natural gas properties of $690.3 million.

[3] Included in costs and expenses for the three months ended March 31, 2015 is impairment of oil and natural gas properties of $404.3 million.

[4] Included in costs and expenses for the three months ended June 30, 2015 is impairment of oil and natural gas properties of $584.2 million.