Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ 17,062us-gaap_ProfitLoss	$ (2,127)us-gaap_ProfitLoss
Adjustments to net income (loss) to reconcile to net cash provided by operating activities:
Net change in fair value of unsettled derivatives	(16,230)	18,931
Depreciation, depletion and amortization	55,820	46,639
Impairment of crude oil and natural gas properties	2,484us-gaap_ImpairmentOfOilAndGasProperties	979us-gaap_ImpairmentOfOilAndGasProperties
Accretion of asset retirement obligation	1,560	861
Stock-based compensation	4,368us-gaap_ShareBasedCompensation	3,847us-gaap_ShareBasedCompensation
Gain (loss) on sale of properties and equipment	(21)	725
Amortization of debt discount and issuance costs	1,751	1,709
Deferred income taxes	8,534us-gaap_DeferredIncomeTaxExpenseBenefit	(1,636)us-gaap_DeferredIncomeTaxExpenseBenefit
Non-cash interest income	(1,112)us-gaap_PaidInKindInterest	0us-gaap_PaidInKindInterest
Other	(280)	(272)
Changes in assets and liabilities	7,941	10,835
Net cash from operating activities	81,877	80,491
Cash flows from investing activities:
Capital expenditures	(176,111)	(135,758)
Proceeds from sale of properties and equipment	24	769
Net cash from investing activities	(176,087)	(134,989)
Cash flows from financing activities:
Proceeds from revolving credit facility	165,000	9,250
Repayment of revolving credit facility	(221,000)us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit
Proceeds from sale of common stock, net of issuance costs	202,851	0
Other	(1,213)	(801)
Net cash from financing activities	145,638	8,449
Net change in cash and cash equivalents	51,428	(46,049)
Cash and cash equivalents, beginning of period	16,066	193,243
Cash and cash equivalents, end of period	67,494	147,194
Cash payments (receipts) for:
Interest, net of capitalized interest	569us-gaap_InterestPaidNet	1,159us-gaap_InterestPaidNet
Income taxes	8,088us-gaap_IncomeTaxesPaidNet	1,800us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities:
Change in accounts payable related to purchases of properties and equipment	(35,836)	(10,978)
Change in asset retirement obligation, with a corresponding change to natural gas and crude oil properties, net of disposals	302	137
Purchase of properties and equipment under capital leases	$ 472us-gaap_CapitalLeaseObligationsIncurred	$ 0us-gaap_CapitalLeaseObligationsIncurred

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

+ Details

Name:	us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration