Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net (loss) income	$ (50,198)us-gaap_ProfitLoss	$ 16,363us-gaap_ProfitLoss
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Unrealized loss on derivatives	8,557us-gaap_UnrealizedGainLossOnDerivatives	3,108us-gaap_UnrealizedGainLossOnDerivatives
Depletion, depreciation and amortization	46,470	24,030
Accretion of asset retirement obligations	112	117
Full-cost ceiling impairment	67,127us-gaap_ImpairmentOfOilAndGasProperties	0us-gaap_ImpairmentOfOilAndGasProperties
Stock-based compensation expense	2,337us-gaap_ShareBasedCompensation	1,795us-gaap_ShareBasedCompensation
Deferred income tax (benefit) provision	(26,390)us-gaap_DeferredIncomeTaxExpenseBenefit	8,261us-gaap_DeferredIncomeTaxExpenseBenefit
Net loss on asset sales and inventory impairment	97	0
Changes in operating assets and liabilities
Accounts receivable	2,140	(6,941)
Lease and well equipment inventory	(112)us-gaap_IncreaseDecreaseInInventories	(31)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	(364)	(424)
Other assets	193	(466)
Accounts payable, accrued liabilities and other current liabilities	45,703	(16,540)
Royalties payable	(2,907)	1,597
Advances from joint interest owners	1,378	0
Income taxes payable	(444)	1,275
Other long-term liabilities	(353)	(199)
Net cash provided by operating activities	93,346	31,945
Investing activities
Oil and natural gas properties capital expenditures	(127,440)	(92,891)
Expenditures for other property and equipment	(14,241)	(1,007)
Business combination, net of cash acquired	(24,028)	0
Restricted cash in less than wholly-owned subsidiary	(383)	0
Net cash used in investing activities	(166,092)	(93,898)
Financing activities
Borrowings under Credit Agreement	70,000us-gaap_ProceedsFromLinesOfCredit	70,000us-gaap_ProceedsFromLinesOfCredit
Proceeds from stock options exercised	0	6
Capital commitment from non-controlling interest in subsidiary	450	0
Taxes paid related to net share settlement of stock-based compensation	(50)	0
Net cash provided by financing activities	70,400	70,006
Increase (decrease) in cash	(2,346)	8,053
Cash at beginning of period	8,407	6,287
Cash at end of period	$ 6,061	$ 14,340

The increase (decrease) in payments made in advance by joint interest partners in oil and gas properties.

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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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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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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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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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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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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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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period in other obligations or expenses incurred but not yet paid.

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The increase (decrease) during the reporting period in other obligations not otherwise defined in the taxonomy where the payments will be made in future periods.

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The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods.

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The increase (decrease) during the reporting period in the obligations due for compensation payments related to the use of copyrights, patents, trade names, licenses, technology. Royalty payments are also paid by the lease holders for oil, gas, and mineral extraction.

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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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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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