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Counterparties representing 10% or more (Details)
Dec. 31, 2015
Dec. 31, 2014
Assets from price risk management activities:    
Counterparty A 59.00% 63.00%
Counterparty B 10.00% 14.00%
Concentration of Risk, Derivative Instruments, Assets 69.00% 77.00%
Liabilities from price risk management activities: [Abstract]    
Counterparty C 36.00% 22.00%
Counterparty D 10.00% 7.00%
Counterparty E 10.00% 9.00%
Counterparty F 5.00% 12.00%
Concentration of Risk, Derivative Instruments, Liabilities 61.00% 50.00%