CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (69,109)	$ (80,201)
Adjustments to reconcile net loss to net cash provided by (used for) operating activities:
Deferred income taxes	768	3,687
Loss on sale of oil and gas properties	1,060	14,103
Exploratory lease impairments		84,144
Impairment of oil and gas properties		24,573
Depreciation, depletion and amortization	93,009	112,410
Gain on derivative financial instruments	(14,585)	(674)
Cash settlements of derivative financial instruments	5,352	2,120
Gain on extinguishment of debt		(190,116)
Amortization of debt discount, premium and issuance costs	24,914	6,413
Interest paid in-kind	28,194	2,576
Stock-based compensation	4,455	3,571
Decrease (increase) in accounts receivable	(11,952)	101
Decrease (increase) in other current assets	(670)	18
Increase (decrease) in accounts payable and accrued expenses	29,327	(37,443)
Net cash provided by (used for) operating activities	90,763	(54,718)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(132,493)	(41,142)
Proceeds from sales of oil and gas properties	1,528	2,067
Net cash used for investing activities	(130,965)	(39,075)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments to retire debt		(3,397)
Common stock warrants exercised	2	9
Debt and equity issuance costs		(9,928)
Tax withholdings related to equity awards	(312)	(313)
Net cash used for financing activities	(310)	(13,629)
Net decrease in cash and cash equivalents	(40,512)	(107,422)
Cash and cash equivalents, beginning of period	65,904	134,006
Cash and cash equivalents, end of period	$ 25,392	$ 26,584