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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:      
Net operating loss carryforwards $ 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Other 0us-gaap_DeferredTaxAssetsOther 0us-gaap_DeferredTaxAssetsOther  
Deferred tax assets, gross 0us-gaap_DeferredTaxAssetsNet 0us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities:      
Property and equipment principally due to differences in depreciation 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Other 69us-gaap_DeferredTaxLiabilitiesDerivatives 0us-gaap_DeferredTaxLiabilitiesDerivatives  
Deferred tax liabilities, gross 69us-gaap_DeferredIncomeTaxLiabilities 0us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax liabilities $ 69us-gaap_DeferredTaxLiabilities $ 0us-gaap_DeferredTaxLiabilities $ 256,000us-gaap_DeferredTaxLiabilities