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 loss	$ (188,328)	$ (44,216)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	356,885	361,430
Gain on extinguishment of debt	(4,865)	0
(Gain) loss on sale of properties	1,305	(172)
Impairment	3,967	24,917
Deferred income taxes	(96,818)	(17,829)
Derivative instruments	55,624	(111,285)
Stock-based compensation expenses	18,761	19,629
Deferred financing costs amortization and other	10,174	7,468
Working capital and other changes:
Change in accounts receivable	11,349	108,309
Change in inventory	2,559	8,425
Change in prepaid expenses	1,168	638
Change in other current assets	(240)	5,529
Change in other assets	(148)	0
Change in accounts payable, interest payable and accrued liabilities	(41,991)	(84,133)
Change in other current liabilities	(6,000)	1,655
Change in other liabilities	17	(28)
Net cash provided by operating activities	123,419	280,337
Cash flows from investing activities:
Capital expenditures	(340,314)	(740,633)
Proceeds from sale of properties	12,333	78
Costs related to sale of properties	(310)	0
Derivative settlements	115,576	291,436
Advances from joint interest partners	544	(1,239)
Net cash used in investing activities	(212,171)	(450,358)
Cash flows from financing activities:
Proceeds from revolving credit facility	835,000	618,000
Principal payments on revolving credit facility	(778,000)	(938,000)
Repurchase of senior unsecured notes	(435,907)	0
Proceeds from issuance of senior unsecured convertible notes	300,000	0
Deferred financing costs	(8,811)	(3,587)
Proceeds from sale of common stock	182,791	462,833
Purchases of treasury stock	(2,275)	(2,771)
Net cash provided by financing activities	92,798	136,475
Increase (decrease) in cash and cash equivalents	4,046	(33,546)
Cash and cash equivalents:
Beginning of period	9,730	45,811
End of period	13,776	12,265
Supplemental non-cash transactions:
Change in accrued capital expenditures	(49,177)	(233,913)
Change in asset retirement obligations	$ (8,083)	$ 3,405