| **Consolidated Statements of Cash Flows (USD $)In Thousands, unless otherwise specified**                                    | 3 Months Ended                                                       |
|------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------|
||
| **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)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts | 18,931us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts |
| Depreciation, depletion and amortization                                                                                     | 55,820us-gaap_DepreciationDepletionAndAmortization                   | 46,639us-gaap_DepreciationDepletionAndAmortization |
| Impairment of crude oil and natural gas properties                                                                           | 2,484us-gaap_ImpairmentOfOilAndGasProperties                         | 979us-gaap_ImpairmentOfOilAndGasProperties |
| Accretion of asset retirement obligation                                                                                     | 1,560us-gaap_AssetRetirementObligationAccretionExpense               | 861us-gaap_AssetRetirementObligationAccretionExpense |
| Stock-based compensation                                                                                                     | 4,368us-gaap_ShareBasedCompensation                                  | 3,847us-gaap_ShareBasedCompensation |
| Gain (loss) on sale of properties and equipment                                                                              | (21)us-gaap_GainLossOnSaleOfPropertyPlantEquipment                   | 725us-gaap_GainLossOnSaleOfPropertyPlantEquipment |
| Amortization of debt discount and issuance costs                                                                             | 1,751us-gaap_AmortizationOfFinancingCostsAndDiscounts                | 1,709us-gaap_AmortizationOfFinancingCostsAndDiscounts |
| 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)us-gaap_OtherOperatingActivitiesCashFlowStatement               | (272)us-gaap_OtherOperatingActivitiesCashFlowStatement |
| Changes in assets and liabilities                                                                                            | 7,941us-gaap_IncreaseDecreaseInOperatingCapital                      | 10,835us-gaap_IncreaseDecreaseInOperatingCapital |
| Net cash from operating activities                                                                                           | 81,877us-gaap_NetCashProvidedByUsedInOperatingActivities             | 80,491us-gaap_NetCashProvidedByUsedInOperatingActivities |
| **Cash flows from investing activities:**                                                                                    |                                                                 |   |
| Capital expenditures                                                                                                         | (176,111)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties      | (135,758)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties |
| Proceeds from sale of properties and equipment                                                                               | 24us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment                | 769us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |
| Net cash from investing activities                                                                                           | (176,087)us-gaap_NetCashProvidedByUsedInInvestingActivities          | (134,989)us-gaap_NetCashProvidedByUsedInInvestingActivities |
| **Cash flows from financing activities:**                                                                                    |                                                                 |   |
| Proceeds from revolving credit facility                                                                                      | 165,000us-gaap_ProceedsFromLongTermLinesOfCredit                     | 9,250us-gaap_ProceedsFromLongTermLinesOfCredit |
| Repayment of revolving credit facility                                                                                       | (221,000)us-gaap_RepaymentsOfLinesOfCredit                           | 0us-gaap_RepaymentsOfLinesOfCredit |
| Proceeds from sale of common stock, net of issuance costs                                                                    | 202,851us-gaap_ProceedsFromIssuanceOfCommonStock                     | 0us-gaap_ProceedsFromIssuanceOfCommonStock |
| Other                                                                                                                        | (1,213)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities       | (801)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities |
| Net cash from financing activities                                                                                           | 145,638us-gaap_NetCashProvidedByUsedInFinancingActivities            | 8,449us-gaap_NetCashProvidedByUsedInFinancingActivities |
| Net change in cash and cash equivalents                                                                                      | 51,428us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease           | (46,049)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |
| Cash and cash equivalents, beginning of period                                                                               | 16,066us-gaap_CashAndCashEquivalentsAtCarryingValue                  | 193,243us-gaap_CashAndCashEquivalentsAtCarryingValue |
| Cash and cash equivalents, end of period                                                                                     | 67,494us-gaap_CashAndCashEquivalentsAtCarryingValue                  | 147,194us-gaap_CashAndCashEquivalentsAtCarryingValue |
| **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)us-gaap_CapitalExpendituresIncurredButNotYetPaid             | (10,978)us-gaap_CapitalExpendituresIncurredButNotYetPaid |
| Change in asset retirement obligation, with a corresponding change to natural gas and crude oil properties, net of disposals | 302us-gaap_IncreaseDecreaseInAssetRetirementObligations              | 137us-gaap_IncreaseDecreaseInAssetRetirementObligations |
| Purchase of properties and equipment under capital leases                                                                    | $ 472us-gaap_CapitalLeaseObligationsIncurred                         | $ 0us-gaap_CapitalLeaseObligationsIncurred |

| X                                                                                                                                                                                                                        |
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| - Definition
Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.
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| - Definition
Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.
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| - Definition
Future cash outflow to pay for purchases of fixed assets that have occurred.
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| - Definition
The increase during the period in capital lease obligations due to entering into new capital leases.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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| - Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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| - Definition
Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.
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| - Definition
The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.
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| - Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.
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| - Definition
The increase (decrease) during the reporting period in the carrying amount of asset retirement obligations.
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| - Definition
The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.
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| - Definition
The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.
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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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| - Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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| - Definition
Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example,  cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).
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| - Definition
Interest paid other than in cash for example by issuing additional debt securities. As a noncash item, it is added to net income when calculating cash provided by or used in operations using the indirect method.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas).
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from the additional capital contribution to the entity.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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