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Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Sales	$ 270,252	$ 306,810	$ 515,357	$ 573,050
Operating Income (Loss)	25,129	34,044	40,086	56,190
Energy & Chemicals [Member]
Segment Reporting Information [Line Items]
Sales	91,339	92,954	178,809	179,100
Operating Income (Loss)	19,958	16,042	35,940	32,649
Distribution & Storage [Member]
Segment Reporting Information [Line Items]
Sales	121,813	149,105	226,884	278,627
Operating Income (Loss)	11,367	24,222	22,642	42,309
BioMedical [Member]
Segment Reporting Information [Line Items]
Sales	57,100	64,751	109,664	115,323
Operating Income (Loss)	6,225	7,424	9,878	9,819
Corporate [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (12,421)	$ (13,644)	$ (28,374)	$ (28,587)

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 1



-Article 5

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