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Intangible Assets (Schedule Of Components Of Intangible Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | $ 394,651 | $ 236,819
Intangible assets, Accumulated Amortization | 165,194 | 153,888
Intangible assets, Carrying Value | 229,457 | 82,931
Refinery Services Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 94,654 | 94,654
Intangible assets, Accumulated Amortization | 85,184 | 81,880
Intangible assets, Carrying Value | 9,470 | 12,774
Refinery Services Licensing Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 38,678 | 38,678
Intangible assets, Accumulated Amortization | 31,016 | 28,983
Intangible assets, Carrying Value | 7,662 | 9,695
Refinery Services Segment Total [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 133,332 | 133,332
Intangible assets, Accumulated Amortization | 116,200 | 110,863
Intangible assets, Carrying Value | 17,132 | 22,469
Supply And Logistics Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 35,430 | 35,430
Intangible assets, Accumulated Amortization | 31,563 | 30,228
Intangible assets, Carrying Value | 3,867 | 5,202
Supply And Logistics Intangibles Associated With Lease [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 13,260 | 13,260
Intangible assets, Accumulated Amortization | 3,868 | 3,512
Intangible assets, Carrying Value | 9,392 | 9,748
Supply And Logistics Segment Total [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 48,690 | 48,690
Intangible assets, Accumulated Amortization | 35,431 | 33,740
Intangible assets, Carrying Value | 13,259 | 14,950
Marine Transportation Contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 32,000 | 32,000
Intangible assets, Accumulated Amortization | 4,583 | 833
Intangible assets, Carrying Value | 27,417 | 31,167
Offshore Pipeline Contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 158,831 | 0
Intangible assets, Accumulated Amortization | 1,393 | 0
Intangible assets, Carrying Value | 157,438 | 0
Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Carrying Amount | 21,798 | 22,797
Intangible assets, Accumulated Amortization | 7,587 | 8,452
Intangible assets, Carrying Value | $ 14,211 | $ 14,345

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