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Acquisition (Selected Financial Information) (Details) (American Phoenix Acquisition [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
American Phoenix Acquisition [Member]
 
SelectedFinancialInformation [Line Items]  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual $ 1,397us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= gel_AmericanPhoenixAcquisitionMember
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual $ 5,580us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= gel_AmericanPhoenixAcquisitionMember