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Intangible Assets (Schedule Of Components Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | $ 237,843 us-gaap_FiniteLivedIntangibleAssetsGross | $ 236,819 us-gaap_FiniteLivedIntangibleAssetsGross
Intangible assets, Accumulated Amortization | 157,925 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 153,888 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, Carrying Value | 79,918 us-gaap_FiniteLivedIntangibleAssetsNet | 82,931 us-gaap_FiniteLivedIntangibleAssetsNet
Refinery Services Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 94,654 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesCustomerRelationshipsMember | 94,654 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesCustomerRelationshipsMember
Intangible assets, Accumulated Amortization | 82,981 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesCustomerRelationshipsMember | 81,880 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesCustomerRelationshipsMember
Intangible assets, Carrying Value | 11,673 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesCustomerRelationshipsMember | 12,774 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesCustomerRelationshipsMember
Refinery Services Licensing Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 38,678 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesLicensingAgreementsMember | 38,678 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesLicensingAgreementsMember
Intangible assets, Accumulated Amortization | 29,661 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesLicensingAgreementsMember | 28,983 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesLicensingAgreementsMember
Intangible assets, Carrying Value | 9,017 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesLicensingAgreementsMember | 9,695 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesLicensingAgreementsMember
Refinery Services Segment Total [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 133,332 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesSegmentTotalMember | 133,332 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesSegmentTotalMember
Intangible assets, Accumulated Amortization | 112,642 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesSegmentTotalMember | 110,863 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesSegmentTotalMember
Intangible assets, Carrying Value | 20,690 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesSegmentTotalMember | 22,469 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_RefineryServicesSegmentTotalMember
Supply And Logistics Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 35,430 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsCustomerRelationshipsMember | 35,430 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsCustomerRelationshipsMember
Intangible assets, Accumulated Amortization | 30,601 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsCustomerRelationshipsMember | 30,228 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsCustomerRelationshipsMember
Intangible assets, Carrying Value | 4,829 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsCustomerRelationshipsMember | 5,202 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsCustomerRelationshipsMember
Supply And Logistics Intangibles Associated With Lease [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 13,260 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsLeaseMember | 13,260 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsLeaseMember
Intangible assets, Accumulated Amortization | 3,631 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsLeaseMember | 3,512 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsLeaseMember
Intangible assets, Carrying Value | 9,629 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsLeaseMember | 9,748 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsLeaseMember
Supply And Logistics Segment Total [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 48,690 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsSegmentTotalMember | 48,690 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsSegmentTotalMember
Intangible assets, Accumulated Amortization | 34,232 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsSegmentTotalMember | 33,740 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsSegmentTotalMember
Intangible assets, Carrying Value | 14,458 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsSegmentTotalMember | 14,950 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_SupplyAndLogisticsSegmentTotalMember
Marine Transportation Contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 32,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_MarineTransportationContractsMember | 32,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_MarineTransportationContractsMember
Intangible assets, Accumulated Amortization | 2,083 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_MarineTransportationContractsMember | 833 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_MarineTransportationContractsMember
Intangible assets, Carrying Value | 29,917 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_MarineTransportationContractsMember | 31,167 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gel_MarineTransportationContractsMember
Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 23,821 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 22,797 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Intangible assets, Accumulated Amortization | 8,968 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 8,452 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Intangible assets, Carrying Value | $ 14,853 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | $ 14,345 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember

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