Intangible Assets (Schedule Of Components Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 255,274	$ 254,671
Intangible assets, Accumulated Amortization	166,830	161,315
Intangible assets, Carrying Value	88,444	93,356
Refinery Services Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	94,654	94,654
Intangible assets, Accumulated Amortization	63,875	62,111
Intangible assets, Carrying Value	30,779	32,543
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	24,289	23,584
Intangible assets, Carrying Value	11,141	11,846
Refinery Services Supplier Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	36,469	36,469
Intangible assets, Accumulated Amortization	34,696	34,105
Intangible assets, Carrying Value	1,773	2,364
Refinery Services Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	38,678	38,678
Intangible assets, Accumulated Amortization	20,330	19,476
Intangible assets, Carrying Value	18,348	19,202
Supply And Logistics Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	18,888	18,888
Intangible assets, Accumulated Amortization	18,053	17,048
Intangible assets, Carrying Value	835	1,840
Intangibles Associated With Supply And Logistics Lease [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	13,260	13,260
Intangible assets, Accumulated Amortization	2,210	2,092
Intangible assets, Carrying Value	11,050	11,168
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	17,895	17,292
Intangible assets, Accumulated Amortization	3,377	2,899
Intangible assets, Carrying Value	$ 14,518	$ 14,393