Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Details 3)

v2.4.1.9
Derivative Instruments (Details 3) (Net fair value of commodity derivative assets position, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Net fair value of commodity derivative assets position
   
Commodity derivative assets    
Gross amounts on balance sheet $ 2,196,341us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
$ 1,621,665us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Gross amounts offset on balance sheet (29,075)us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
(29,114)us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Total asset derivatives $ 2,167,266us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
$ 1,592,551us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember