Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net loss	$ (116,655)	$ (28,834)	$ (19,875)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation, depletion, and amortization	31,228	18,414	17,111
Impairment of proved and unproved oil and gas properties	138,086	19,359	12,298
Impairment of goodwill	1,547
Unrealized (gain) loss on derivative contracts	(125)	(3,614)	45
Dry hole costs			2,096
(Gain) loss on sales of oil and gas properties	(1,617)		121
Accretion of asset retirement obligations	550	317	217
Deferred income taxes	(26,533)	22,105
Amortization of deferred financing costs	264	164	103
Settlement of asset retirement obligations	(108)	(56)
Changes in assets and liabilities:
Decrease (increase) in accounts receivable	9,246	(5,305)	(12,141)
Decrease (increase) in prepaid expenses and other	779	(194)	(81)
(Decrease) increase in accounts payable and accrued expenses	(30,887)	28,408	2,171
(Decrease) increase in revenue and royalties payable	(8,739)	7,099	9,698
(Decrease) increase in advances	(5,929)	17,925	3,520
Net cash (used in) provided by operating activities	(10,440)	75,788	15,283
Cash flows from investing activities:
Acquisitions of oil and gas property	(8,706)	(18,772)	(86,687)
Additions to oil and gas property and equipment	(61,060)	(83,041)	(31,162)
Additions to other property and equipment	(378)	(1,385)	(678)
Reverse acquisition with Oak Valley, net of cash		(4,239)
Insurance proceeds			923
Proceeds from sales of oil and gas properties	3,441		488
Proceeds from sale of land	101
Net cash used in investing activities	(66,602)	(107,437)	(117,116)
Cash flows from financing activities:
Issuance of long-term debt		11,191
Reduction of long-term debt		(10,825)
Deferred financing costs	(141)	(613)	(425)
Contributions, net of issuance costs		106,920	107,530
Net cash (used in) provided by financing activities	(141)	106,673	107,105
Net (decrease) increase in cash and cash equivalents	(77,183)	75,024	5,272
Cash and cash equivalents at beginning of period	100,447	25,423	20,151
Cash and cash equivalents at end of period	23,264	100,447	25,423
Cash paid for:
Interest	415	493	375
Non-cash investing and financing activities:
Asset retirement obligations	150	237	1,033
Acquisitions of oil and gas properties	1,991
Stock issued for 2014 Eagle Ford Acquisition Properties		56,425
Proved And Unproved Property
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Impairment of proved and unproved oil and gas properties	$ 136,539	$ 19,359	$ 12,298