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Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Deferred tax assets, Other current assets $ 262gel_DeferredTaxAssetsOtherCurrent $ 297gel_DeferredTaxAssetsOtherCurrent
Deferred tax assets, Other 8us-gaap_DeferredTaxAssetsOther 8us-gaap_DeferredTaxAssetsOther
Total current deferred tax asset 270us-gaap_DeferredTaxAssetsNetCurrent 305us-gaap_DeferredTaxAssetsNetCurrent
Net operating loss carryforwards 9,048us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 7,784us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Total long-term deferred tax asset 9,048us-gaap_DeferredTaxAssetsNetNoncurrent 7,784us-gaap_DeferredTaxAssetsNetNoncurrent
Valuation allowances (737)us-gaap_DeferredTaxAssetsValuationAllowance (660)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 8,581us-gaap_DeferredTaxAssetsNet 7,429us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities, Other (871)us-gaap_DeferredTaxLiabilitiesOther (785)us-gaap_DeferredTaxLiabilitiesOther
Fixed assets (4,335)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (4,441)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible assets (14,419)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (11,503)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total long-term liability (18,754)us-gaap_DeferredTaxLiabilitiesNoncurrent (15,944)us-gaap_DeferredTaxLiabilitiesNoncurrent
Total deferred tax liabilities (19,625)us-gaap_DeferredTaxLiabilities (16,729)us-gaap_DeferredTaxLiabilities
Total net deferred tax liability $ (11,044)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (9,300)us-gaap_DeferredTaxAssetsLiabilitiesNet