Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities
Net (loss) income	$ (449,228)	$ 64,208
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Unrealized loss (gain) on derivatives	25,356	(7,950)
Depletion, depreciation and amortization	143,477	90,970
Accretion of asset retirement obligations	427	371
Full-cost ceiling impairment	581,874	0
Stock-based compensation expense	6,886	4,665
Deferred income tax (benefit) provision	(148,750)	34,017
Amortization of Financing Costs and Discounts	551	0
Net loss on asset sales and inventory impairment	97	0
Changes in operating assets and liabilities
Accounts receivable	1,997	(12,605)
Lease and well equipment inventory	(225)	(193)
Prepaid expenses	(329)	(74)
Other assets	665	(810)
Accounts payable, accrued liabilities and other current liabilities	16,863	(820)
Royalties payable	6,898	6,175
Advances from joint interest owners	306	0
Income taxes payable	(444)	2,565
Other long-term liabilities	(497)	(160)
Net cash provided by operating activities	185,924	180,359
Investing activities
Oil and natural gas properties capital expenditures	(334,951)	(407,023)
Expenditures for other property and equipment	(46,738)	(2,906)
Business combination, net of cash acquired	(24,028)	0
Increase (Decrease) in Restricted Cash	158	0
Net cash used in investing activities	(405,559)	(409,929)
Financing activities
Repayments of borrowings	(476,982)	(180,000)
Borrowings under Credit Agreement	125,000	230,000
Proceeds from issuance of senior unsecured notes	400,000	0
Cost to issue senior unsecured notes	(9,479)	0
Proceeds from issuance of common stock	188,720	181,875
Cost to issue equity	(1,151)	(590)
Proceeds from stock options exercised	10	6
Capital contribution from non-controlling interest owners in less-than-wholly-owned subsidiary	600	0
Payments to Noncontrolling Interests	(38)	0
Taxes paid related to net share settlement of stock-based compensation	(1,565)	(285)
Net cash provided by financing activities	225,115	231,006
Increase in cash	5,480	1,436
Cash at beginning of period	8,407	$ 6,287
Cash at end of period	$ 13,887