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Price Risk Management Counterparties Representing 10% or More (Details)
Mar. 31, 2015
Dec. 31, 2014
Assets from price risk management activities:    
Counterparty A 67.00%por_CounterpartyA 63.00%por_CounterpartyA
Counterparty B 8.00%por_CounterpartyB 14.00%por_CounterpartyB
Total 75.00%por_ConcentrationOfRiskDerivativeInstrumentsAssets 77.00%por_ConcentrationOfRiskDerivativeInstrumentsAssets
Liabilities from price risk management activities:    
Counterparty C 31.00%por_CounterpartyDforPRMLiab 22.00%por_CounterpartyDforPRMLiab
Counterparty D 9.00%por_CounterpartyEForPRMLiab 12.00%por_CounterpartyEForPRMLiab
Total 40.00%por_ConcentrationOfRiskDerivativeInstrumentsLiabilities 34.00%por_ConcentrationOfRiskDerivativeInstrumentsLiabilities