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