CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (45,473)	$ (515,891)
Adjustments to reconcile net loss to net cash provided by operating activities:
Net loss on divestiture activity	129,670	18,975
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	291,044	425,227
Impairment of proved properties	3,806	269,785
Abandonment and impairment of unproved properties	157	2,349
Stock-based compensation expense	9,813	13,915
Net derivative (gain) loss	(169,963)	149,123
Proceeds from Derivative Settlement	16,310	248,738
Amortization of debt discount and deferred financing costs	8,679	1,930
Non-cash (gain) loss on extinguishment of debt, net	22	(15,722)
Deferred income taxes	(30,790)	(291,014)
Plugging and abandonment	(1,609)	(2,716)
Other, net	2,267	2,517
Changes in current assets and liabilities:
Accounts receivable	46,993	(11,220)
Prepaid expenses and other	(9,321)	8,487
Accounts payable and accrued expenses	(8,973)	(61,727)
Accrued derivative settlements	(517)	14,117
Net cash provided by operating activities	242,115	256,873
Cash flows from investing activities:
Net proceeds from the sale of oil and gas properties	766,247	12,967
Capital expenditures	(366,743)	(345,570)
Acquisition of proved and unproved oil and gas properties	(88,140)	(17,751)
Other, net	3,000	(900)
Net cash provided by (used in) investing activities	314,364	(351,254)
Cash flows from financing activities:
Proceeds from credit facility	406,000	585,000
Repayment of credit facility	(406,000)	(456,500)
Debt issuance costs related to credit facility	0	(3,132)
Cash paid to repurchase Senior Notes	(2,344)	(29,904)
Net proceeds from sale of common stock	1,738	2,354
Dividends paid	(5,563)	(3,404)
Other, net	(161)	(33)
Net cash provided by (used in) financing activities	(6,330)	94,381
Net change in cash and cash equivalents	550,149	0
Cash and cash equivalents at beginning of period	9,372	18
Cash and cash equivalents at end of period	559,521	18
Supplemental schedule of additional cash flow information and non-cash activities:
Cash paid for interest, net of capitalized interest	(83,493)	(63,590)
Net cash (paid) refunded for income taxes	(8,220)	4,564
Changes in capital expenditures accruals and other	44,770	2,986
Fair value of properties exchanged	$ 279,750	$ 733