CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (25,691)	$ (23,558)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	49,384	37,381
Exploration costs	82	1,716
Accretion of asset retirement obligations	170	249
Amortization and write off of deferred loan origination costs	588	1,108
Amortization of bond premium	(191)	(191)
Deferred income tax benefit	(9,568)	(5,474)
Stock-based compensation	2,759	1,641
Derivative income	(2,088)	(7,142)
Net cash received for derivative settlements	21,988	13,196
Net cash (paid) received for option premiums	(488)	17,398
Net premiums received (paid) on options that settled during the period	10,414	(136)
Changes in operating assets and liabilities, net of acquisitions:
Restricted cash	(468)
Accounts receivable	(14,733)	4,547
Accounts receivable—related parties	(857)	1,822
Materials and supplies		(575)
Other current assets	(14,108)	2
Other noncurrent assets	347	(97)
Accounts payable and accrued expenses	3,889	(22,865)
Revenue and severance taxes payable	(1,524)	(661)
Other noncurrent liabilities		(374)
Net cash provided by operating activities	19,905	17,987
CASH FLOWS FROM INVESTING ACTIVITIES:
Development of oil and natural gas properties	(122,623)	(117,930)
Acquisitions of oil and natural gas properties	(208,832)	(21,722)
Additions to other property and equipment	(3,004)	(4,567)
Other investing activities		(925)
Net cash used in investing activities	(334,459)	(145,144)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on long-term debt	(236)	(120,164)
Debt issuance costs	(1)
Proceeds from issuance of common stock, net	36	224,007
Repurchase of restricted stock	(19)
Net cash (used in) provided by financing activities	(220)	103,843
Net decrease in cash and cash equivalents	(314,774)	(23,314)
Cash and cash equivalents at beginning of period	343,084	50,550
Cash and cash equivalents at end of period	28,310	27,236
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	21,211	21,262
Cash paid for income taxes	315
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES:
Asset retirement obligations incurred, including changes in estimate	675	73
(Reductions) additions to oil and natural gas properties - change in capital accruals	(12,254)	$ 3,802
Additions to other property and equipment funded by capital lease borrowings	$ 84