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Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Sales	$ 193,757	$ 245,105
Operating Income (Loss)	37	14,957
Energy & Chemicals [Member]
Segment Reporting Information [Line Items]
Sales	37,959	87,470
Operating Income (Loss)	(2,198)	15,291
Distribution & Storage [Member]
Segment Reporting Information [Line Items]
Sales	107,497	105,071
Operating Income (Loss)	9,830	10,312
BioMedical [Member]
Segment Reporting Information [Line Items]
Sales	48,301	52,564
Operating Income (Loss)	6,652	3,236
Corporate [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (14,247)	$ (13,882)

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

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