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Stock Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2015
Feb. 28, 2015
Mar. 31, 2014
Stock options | Stock Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 3 years    
Expiration period 10 years    
Restricted Stock Units (RSUs) | Stock Compensation Plan | 3 year vesting period      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 3 years    
Grants in period (in shares)   99,814us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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Weighted average grant date fair value   $ 65.15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Restricted Stock Units (RSUs) | Petrotech Incentive Plan | 3 year vesting period      
Share-based Compensation Arrangement by Share-based Payment Award      
Grants in period (in shares) 64,305us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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Weighted average grant date fair value 91.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Performance share awards | Stock Compensation Plan | 3 year vesting period      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 3 years    
Grants in period (in shares) 120,372us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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Weighted average grant date fair value 83.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Performance share awards | Petrotech Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Grants in period (in shares) 59,288us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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Weighted average grant date fair value 65.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Performance share awards | Petrotech Incentive Plan | Vesting Period, Twenty Months [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 24 months    
Performance share awards | Petrotech Incentive Plan | 3 year vesting period      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 3 years    
Performance share awards | Petrotech Incentive Plan | 16 month vesting period      
Share-based Compensation Arrangement by Share-based Payment Award      
Grants in period (in shares) 1,472us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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Weighted average grant date fair value 65.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Performance share awards | Petrotech Incentive Plan | 24 month vesting period      
Share-based Compensation Arrangement by Share-based Payment Award      
Grants in period (in shares) 265us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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Weighted average grant date fair value 65.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 3 years    
Deferred Compensation      
Share-based Compensation Arrangement by Share-based Payment Award      
Noncash payments for repurchase of common stock 4.4egn_NoncashPaymentsForRepurchaseOfCommonStock
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  $ 0.3egn_NoncashPaymentsForRepurchaseOfCommonStock
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