CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ 74,434	$ (347,210)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net (gain) loss on divestiture activity	(37,463)	69,021
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	137,812	214,207
Impairment of proved properties	0	269,785
Abandonment and impairment of unproved properties	0	2,311
Stock-based compensation expense	5,455	6,868
Net derivative gain	(114,774)	(14,228)
Derivative settlement gain	7	147,028
Amortization of discount and deferred financing costs	4,946	(920)
Non-cash (gain) loss on extinguishment of debt, net	22	(15,722)
Deferred income taxes	33,225	(195,039)
Plugging and abandonment	(1,191)	(604)
Other, net	4,567	(1,151)
Changes in current assets and liabilities:
Accounts receivable	30,407	26,922
Prepaid expenses and other	178	4,984
Accounts payable and accrued expenses	(5,497)	(52,294)
Accrued derivative settlements	2,838	4,318
Net cash provided by operating activities	134,966	118,276
Cash flows from investing activities:
Net proceeds from the sale of oil and gas properties	744,333	1,206
Capital expenditures	(154,401)	(176,370)
Acquisition of proved and unproved oil and gas properties	(75,105)	(15,044)
Other, net	2,486	885
Net cash provided by (used in) investing activities	517,313	(189,323)
Cash flows from financing activities:
Proceeds from credit facility	397,500	317,000
Repayment of credit facility	(397,500)	(226,000)
Cash paid to repurchase Senior Notes	2,344	19,917
Other, net	(160)	(3)
Net cash provided by (used in) financing activities	(2,504)	71,080
Net change in cash and cash equivalents	649,775	33
Cash and cash equivalents at beginning of period	9,372	18
Cash and cash equivalents at end of period	659,147	51
Supplemental schedule of additional cash flow information and non-cash activities:
Cash paid for interest, net of capitalized interest	(42,872)	(24,453)
Net cash refunded for income taxes	15	4,689
Changes in capital expenditure accruals and other	27,214	20,643
Fair value of properties exchanged	24,544	733
Dividends declared, but not paid	$ 5,563	$ 3,404