Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net loss	$ (35,500)	$ (4,537)
Adjustments to net loss to reconcile to net cash provided by operating activities:
Unrealized loss on derivatives, net	(32,057)	(20,917)
Depreciation, depletion and amortization	88,877	106,745
Impairment of crude oil and natural gas properties	52,436	1,418
Exploratory dry hole costs	0	1,043
Accretion of asset retirement obligation	3,667	2,839
Stock-based compensation	9,991	6,126
(Gain) loss on sale of properties and equipment	(1,571)	23,828
Amortization of debt discount and issuance costs	5,093	5,082
Deferred income taxes	(21,714)	(7,090)
Other	(1,017)	4,674
Changes in assets and liabilities	(15,918)	13,786
Net cash from operating activities	119,543	127,175
Cash flows from investing activities:
Capital expenditures	(256,096)	(271,769)
Acquisition of oil and gas properties	0	(309,285)
Proceeds from acquisition adjustments	7,579	11,969
Proceeds from sale of properties and equipment	178,987	192,040
Increase in Restricted Cash	0	17,497
Net cash from investing activities	(69,530)	(394,542)
Cash flows from financing activities:
Proceeds from revolving credit facility	252,500	591,250
Payment of revolving credit facility	(278,000)	(492,250)
Proceeds from sale of common stock, net of issuance costs	275,847	164,496
Other	(4,329)	(1,460)
Net cash from financing activities	246,018	262,036
Net increase (decrease) in cash and cash equivalents	296,031	(5,331)
Cash and cash equivalents, beginning of period	2,457	8,238
Cash and cash equivalents, end of period	298,488	2,907
Cash payments (receipts) for:
Interest, net of capitalized interest	26,408	30,868
Income taxes	525	1,830
Non-cash investing activities:
Change in accounts payable related to purchases of properties and equipment	24,308	(9,514)
Change in asset retirement obligation, with a corresponding change to natural gas and crude oil properties, net of disposals	$ 337	$ 11,871