Intangible Assets (Schedule Of Components Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 201,912	$ 256,311
Intangible assets, Accumulated Amortization	133,126	181,246
Intangible assets, Carrying Value	68,786	75,065
Refinery Services Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	94,654	94,654
Intangible assets, Accumulated Amortization	72,725	69,167
Intangible assets, Carrying Value	21,929	25,487
Refinery Services Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	38,678	38,678
Intangible assets, Accumulated Amortization	24,474	22,892
Intangible assets, Carrying Value	14,204	15,786
Refinery Services Supplier Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	0	36,469
Intangible assets, Accumulated Amortization	0	36,469
Intangible assets, Carrying Value	0	0
Refinery Services Segment Total [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	133,332	169,801
Intangible assets, Accumulated Amortization	97,199	128,528
Intangible assets, Carrying Value	36,133	41,273
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	27,485	26,403
Intangible assets, Carrying Value	7,945	9,027
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	2,802	2,565
Intangible assets, Carrying Value	10,458	10,695
Supply And Logistics Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	0	18,888
Intangible assets, Accumulated Amortization	0	18,888
Intangible assets, Carrying Value	0	0
Supply And Logistics Segment Total [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	48,690	67,578
Intangible assets, Accumulated Amortization	30,287	47,856
Intangible assets, Carrying Value	18,403	19,722
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	19,890	18,932
Intangible assets, Accumulated Amortization	5,640	4,862
Intangible assets, Carrying Value	$ 14,250	$ 14,070