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Deferred Tax Asset (Liabilities) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss $ 528,782us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 535,959us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
State deferred tax assets 7,885us-gaap_DeferredTaxAssetsStateTaxes 8,418us-gaap_DeferredTaxAssetsStateTaxes
Capital loss carry forwards 26,141us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 26,141us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Property and equipment 34,312us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 34,683us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Investment in Piceance Energy 31,334us-gaap_DeferredTaxAssetsInvestments 32,138us-gaap_DeferredTaxAssetsInvestments
Other 6,112us-gaap_DeferredTaxAssetsOther 2,510us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 634,566us-gaap_DeferredTaxAssetsGross 639,849us-gaap_DeferredTaxAssetsGross
Valuation allowance (631,599)us-gaap_DeferredTaxAssetsValuationAllowance (637,464)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 2,967us-gaap_DeferredTaxAssetsNet 2,385us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Property and equipment 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 5us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Texadian Energy intangibles 1,677us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 2,380us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Other 1,272us-gaap_DeferredTaxLiabilitiesOther 0us-gaap_DeferredTaxLiabilitiesOther
State liabilities 57us-gaap_DeferredTaxLiabilitiesFinancingArrangements 216us-gaap_DeferredTaxLiabilitiesFinancingArrangements
Total deferred tax liabilities 3,006us-gaap_DeferredTaxLiabilities 2,601us-gaap_DeferredTaxLiabilities
Total deferred tax liability, net $ (39)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (216)us-gaap_DeferredTaxAssetsLiabilitiesNet