Intangible Assets (Schedule Of Components Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 255,846	$ 254,671
Intangible assets, Accumulated Amortization	176,706	161,315
Intangible assets, Carrying Value	79,140	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	67,403	62,111
Intangible assets, Carrying Value	27,251	32,543
Refinery Services Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	38,678	38,678
Intangible assets, Accumulated Amortization	22,038	19,476
Intangible assets, Carrying Value	16,640	19,202
Refinery Services Supplier Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	36,469	36,469
Intangible assets, Accumulated Amortization	35,878	34,105
Intangible assets, Carrying Value	591	2,364
Refinery Services Segment Total [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	169,801	169,801
Intangible assets, Accumulated Amortization	125,319	115,692
Intangible assets, Carrying Value	44,482	54,109
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	25,698	23,584
Intangible assets, Carrying Value	9,732	11,846
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	2,447	2,092
Intangible assets, Carrying Value	10,813	11,168
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	18,888	17,048
Intangible assets, Carrying Value	0	1,840
Supply And Logistics Segment Total [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	67,578	67,578
Intangible assets, Accumulated Amortization	47,033	42,724
Intangible assets, Carrying Value	20,545	24,854
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	18,467	17,292
Intangible assets, Accumulated Amortization	4,354	2,899
Intangible assets, Carrying Value	$ 14,113	$ 14,393