CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (124,364)	$ (2,767)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	448,910	472,335
Deferred income tax expense (benefit)	(59,413)	8,226
(Gain) loss on sale of assets	768	(3,814)
Exploratory dry hole cost	18	184
(Gain) loss on derivative instruments	1,286	(44,668)
Net cash received (paid) in settlement of derivative instruments	3,204	133,827
Earnings on equity method investments	(208)	(4,581)
Amortization of debt issuance costs	3,888	3,395
Stock-based compensation and other	23,051	11,622
Changes in assets and liabilities:
Accounts receivable, net	(1,135)	112,712
Income taxes	(11,235)	(10,158)
Inventories	2,860	(4,256)
Other current assets	(917)	(2,106)
Accounts payable and accrued liabilities	(17,230)	(66,350)
Interest payable	17,618	17,082
Other assets and liabilities	784	(1,565)
Net cash provided by operating activities	252,649	584,954
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(245,033)	(819,839)
Acquisitions	0	(16,312)
Proceeds from sale of assets	49,068	7,380
Investment in equity method investments	(24,176)	(20,798)
Net cash used in investing activities	(220,141)	(849,569)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings from debt	90,000	790,000
Repayments of debt	(587,000)	(505,000)
Sale of common stock, net	995,279	0
Dividends paid	(26,885)	(24,812)
Capitalized debt issuance costs	(3,223)	(7,838)
Other	0	84
Net cash provided by financing activities	468,171	252,434
Net increase (decrease) in cash and cash equivalents	500,679	(12,181)
Cash and cash equivalents, beginning of period	514	20,954
Cash and cash equivalents, end of period	501,193	8,773
Supplemental non-cash investing transactions:
Change in accrued capital costs	$ 17,072	$ (159,102)