Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Members' Equity [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Oak Valley Resources, LLC [Member]	Oak Valley Resources, LLC [Member] Members' Equity [Member]	Oak Valley Resources, LLC [Member] Members' Equity [Member] Subsidiaries [Member]	Oak Valley Resources, LLC [Member] Common Stock [Member]	Oak Valley Resources, LLC [Member] Common Stock [Member] Subsidiaries [Member]	Oak Valley Resources, LLC [Member] Additional Paid-in Capital [Member]	Oak Valley Resources, LLC [Member] Additional Paid-in Capital [Member] Subsidiaries [Member]	Oak Valley Resources, LLC [Member] Treasury Stock [Member]	Eagle Ford [Member]	Eagle Ford [Member] Common Stock [Member]	Eagle Ford [Member] Additional Paid-in Capital [Member]
Beginning Balance, amount at Dec. 31, 2012	$ 61,267	$ 61,267
Contributions							$ 107,530	$ 107,530
Net income (loss)	(19,875)	(19,875)
Ending Balance, amount at Dec. 31, 2013	148,922	148,922
Contributions							107,020	$ 107,020	$ (268,220)		$ 9		$ 268,211
Contribution, shares											9,124,452
Reverse acquisition							$ 32,995			$ 2		$ 33,453		$ (460)	$ 56,425	$ 3	$ 56,422
Reverse acquisition, shares										1,753,388				(15,357)		2,957,288
Net income (loss)	(28,834)	$ 12,278			$ (41,112)
Ending Balance, amount at Dec. 31, 2014	316,528		$ 14	$ 358,086	(41,112)	$ (460)
Ending Balance, shares at Dec. 31, 2014			13,835,128			(15,357)
Net income (loss)	(116,655)				(116,655)
Ending Balance, amount at Dec. 31, 2015	$ 199,873		$ 14	$ 358,086	$ (157,767)	$ (460)
Ending Balance, shares at Dec. 31, 2015			13,835,128			(15,357)