CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (54,820)	$ (47,095)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	171,113	127,873
Exploration costs	6,026	2,867
Accretion of asset retirement obligations	575	657
Loss (gain) on sale of property	119	(2,331)
Amortization and write off of deferred loan origination costs	2,293	2,125
Amortization of bond premium	(617)	(573)
Stock-based compensation	9,466	5,855
Deferred income tax benefit	(21,765)	(15,133)
Loss (gain) on derivatives	23,842	(23,699)
Net cash received for derivative settlements	28,678	32,054
Net cash received (paid) for option premiums	(2,270)	25,706
Net premiums received on options that settled during the period	26,181	7,130
Changes in operating assets and liabilities, net of acquisitions:
Restricted cash	(1,616)	0
Accounts receivable	(23,295)	16,450
Accounts receivable—related parties	59	3,478
Materials and supplies	0	3,767
Other current assets	(38,436)	(9,023)
Other noncurrent assets	682	(937)
Accounts payable and accrued expenses	28,168	(16,748)
Revenue and severance taxes payable	20,817	(1,569)
Other noncurrent liabilities	2	(374)
Net cash provided by operating activities	175,202	110,480
CASH FLOWS FROM INVESTING ACTIVITIES:
Development of oil and natural gas properties	(385,076)	(282,171)
Acquisitions of oil and natural gas properties	(864,870)	(64,921)
Acquisition of Pacesetter Drilling, LLC	0	(2,408)
Additions to other property and equipment	(20,818)	(19,690)
Proceeds from sale of oil and natural gas properties	0	10,448
Proceeds from sale of other property and equipment	0	1,199
Net cash used in investing activities	(1,270,764)	(357,543)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under long-term debt	404,000	105,000
Payments on long-term debt	(813)	(225,510)
Debt issuance costs	(8,958)	(782)
Proceeds from issuance of common stock, net	930,315	441,000
Repurchase of common stock	(213)	(71)
Vesting of restricted stock units	(91)	(6)
Net cash provided by financing activities	1,324,240	319,631
Net increase in cash and cash equivalents	228,678	72,568
Cash and cash equivalents at beginning of period	343,084	50,550
Cash and cash equivalents at end of period	571,762	123,118
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	42,909	43,306
Cash paid for income taxes	315	0
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES:
Asset retirement obligations incurred, including changes in estimate	(1,124)	3,201
(Reductions) additions to oil and natural gas properties - change in capital accruals	(46,669)	34,832
Additions to other property and equipment funded by capital lease borrowings	$ 1,517	$ 616