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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets:    
Stock Compensation $ 1,249us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost $ 916us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Other 80us-gaap_DeferredTaxAssetsOther 45us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets 1,329us-gaap_DeferredTaxAssetsNet 961us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:    
Property and equipment (58,610)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (51,377)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Goodwill and other intangible assets (1,023)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (1,048)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Total deferred income tax liabilities (59,633)us-gaap_DeferredTaxLiabilities (52,425)us-gaap_DeferredTaxLiabilities
Net deferred income tax liabilities $ (58,304)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (51,464)us-gaap_DeferredTaxAssetsLiabilitiesNet