CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (96,714)	$ (59,586)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	57,306	128,929
Deferred income tax benefit	0	(36,544)
Impairment of oil and gas properties	10,000	0
Abandonment and impairment of unproved properties	16,781	19,996
Dry hole expense	966	5,680
Stock-based compensation	5,384	7,787
Amortization of deferred financing costs and debt premium	2,279	1,226
Accretion of contractual obligation for land acquisition	0	698
Derivative (gain) loss	13,930	(13,378)
Derivative cash settlements	11,401	50,655
Other	(112)	(43)
Changes in current assets and liabilities:
Accounts receivable	23,415	18,319
Prepaid expenses and other assets	(1,348)	(1,348)
Accounts payable and accrued liabilities	(28,457)	(23,054)
Settlement of asset retirement obligations	(75)	(519)
Net cash provided by operating activities	14,756	98,818
Cash flows from investing activities:
Acquisition of oil and gas properties	(816)	(11,914)
Payments of contractual obligation	(12,000)	0
Exploration and development of oil and gas properties	(42,753)	(283,106)
Increase in restricted cash	(2,535)	0
Additions to property and equipment - non oil and gas	39	(649)
Net cash used in investing activities	(58,065)	(295,669)
Cash flows from financing activities:
Proceeds from credit facility	209,000	87,000
Payments to credit facility	(14,667)	(77,000)
Proceeds from sale of common stock	0	209,300
Offering costs related to sale of common stock	0	(6,607)
Offering costs related to sale of Senior Notes	0	(93)
Payment of employee tax withholdings in exchange for the return of common stock	(273)	(2,448)
Deferred restructuring charges	(1,684)	0
Deferred financing costs	(237)	(545)
Net cash provided by financing activities	192,139	209,607
Net change in cash and cash equivalents	148,830	12,756
Cash and cash equivalents:
Beginning of period	21,341	2,584
End of period	170,171	15,340
Supplemental cash flow disclosure:
Cash paid for interest	28,553	27,396
Cash paid for income taxes	0	820
Changes in working capital related to drilling expenditures, natural gas plant expenditures, and property acquisition	$ (25,462)	$ (12,935)