Intangible Assets (Schedule Of Components Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 203,736	$ 203,378
Intangible assets, Accumulated Amortization	146,743	140,450
Intangible assets, Carrying Value	56,993	62,928
Refinery Services Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	94,654	94,654
Intangible assets, Accumulated Amortization	79,082	76,283
Intangible assets, Carrying Value	15,572	18,371
Refinery Services Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	38,678	38,678
Intangible assets, Accumulated Amortization	27,519	26,055
Intangible assets, Carrying Value	11,159	12,623
Refinery Services Segment Total [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	133,332	133,332
Intangible assets, Accumulated Amortization	106,601	102,338
Intangible assets, Carrying Value	26,731	30,994
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	29,398	28,568
Intangible assets, Carrying Value	6,032	6,862
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	3,275	3,039
Intangible assets, Carrying Value	9,985	10,221
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	32,673	31,607
Intangible assets, Carrying Value	16,017	17,083
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	21,714	21,356
Intangible assets, Accumulated Amortization	7,469	6,505
Intangible assets, Carrying Value	$ 14,245	$ 14,851