Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net Income (Loss)	$ (15,420)us-gaap_NetIncomeLoss	$ 53,316us-gaap_NetIncomeLoss
Income from discontinued operations	0	(37,669)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	134,381	124,220
Asset impairment	6,583us-gaap_AssetImpairmentCharges	1,246us-gaap_AssetImpairmentCharges
Accretion of discount on asset retirement obligations	2,010	1,843
Deferred income taxes	(16,009)us-gaap_DeferredIncomeTaxExpenseBenefit	10,958us-gaap_DeferredIncomeTaxExpenseBenefit
Change in derivative fair value	30,987us-gaap_UnrealizedGainLossOnDerivatives	39,555us-gaap_UnrealizedGainLossOnDerivatives
Gain on sale of assets	(28,502)us-gaap_GainLossOnDispositionOfAssets1	(60)us-gaap_GainLossOnDispositionOfAssets1
Stock-based compensation expense	(61)us-gaap_ShareBasedCompensation	5,041us-gaap_ShareBasedCompensation
Exploration, including dry holes	24egn_ExplorationNonCashPortionOfExpense	31egn_ExplorationNonCashPortionOfExpense
Discontinued operations	0	111,678
Other, net	(10,968)us-gaap_OtherNoncashIncomeExpense	6,335us-gaap_OtherNoncashIncomeExpense
Net change in:
Accounts receivable	42,908	(32,463)
Inventories	(3,512)us-gaap_IncreaseDecreaseInInventories	247us-gaap_IncreaseDecreaseInInventories
Accounts payable	(11,814)	24,161
Accrued taxes/income tax receivable	13,633	1,273
Pension and other postretirement benefit contributions	(10,872)	(2,290)
Other current assets and liabilities	9,634	(10,471)
Net cash provided by operating activities	143,002	296,951
Investing Activities
Additions to oil and natural gas properties	(395,317)	(266,869)
Acquisitions, net of cash acquired	(30,767)	(6,537)
Proceeds from the sale of assets	392,802	7,313
Purchase of short-term investments	(649,000)	(84,000)
Sale of short-term investments	340,000	84,000
Discontinued operations	0	(14,731)
Other, net	0	(150)
Net cash used in investing activities	(342,282)	(280,974)
Financing Activities
Payment of dividends on common stock	(1,462)us-gaap_PaymentsOfDividendsCommonStock	(10,907)us-gaap_PaymentsOfDividendsCommonStock
Issuance of common stock	291	3,060
Reduction of long-term debt	0us-gaap_RepaymentsOfLongTermDebt	(15,000)us-gaap_RepaymentsOfLongTermDebt
Net change in credit facility	200,000	86,000
Tax benefit on stock compensation	129	686
Discontinued operations	0	(50,028)
Net cash provided by financing activities	198,958	13,811
Net increase (decrease) in cash and cash equivalents	(322)	29,788
Cash and cash equivalents at beginning of period	1,852	5,555
Cash and cash equivalents at end of period	$ 1,530	$ 35,343

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The increase (decrease) during the reporting period in the amount due to fund pension and non-pension benefits to employees, retired and disabled former employees.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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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 the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash inflow from the additional capital contribution to the entity.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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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.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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