Intangible Assets (Schedule Of Components Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 255,711	$ 254,671
Intangible assets, Accumulated Amortization	172,186	161,315
Intangible assets, Carrying Value	83,525	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	65,639	62,111
Intangible assets, Carrying Value	29,015	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	21,184	19,476
Intangible assets, Carrying Value	17,494	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	35,287	34,105
Intangible assets, Carrying Value	1,182	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	122,110	115,692
Intangible assets, Carrying Value	47,691	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	24,994	23,584
Intangible assets, Carrying Value	10,436	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	2,328	2,092
Intangible assets, Carrying Value	10,932	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	46,210	42,724
Intangible assets, Carrying Value	21,368	24,854
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	18,332	17,292
Intangible assets, Accumulated Amortization	3,866	2,899
Intangible assets, Carrying Value	$ 14,466	$ 14,393