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Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Sales	$ 204,095	$ 193,757
Operating Income (Loss)	247	37
Energy & Chemicals [Member]
Segment Reporting Information [Line Items]
Sales	39,867	37,959
Operating Income (Loss)	(181)	(2,198)
Distribution & Storage [Member]
Segment Reporting Information [Line Items]
Sales	113,258	107,497
Operating Income (Loss)	11,593	9,830
BioMedical [Member]
Segment Reporting Information [Line Items]
Sales	50,970	48,301
Operating Income (Loss)	5,000	6,652
Corporate [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (16,165)	$ (14,247)

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=63488584&loc=d3e20235-122688

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