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Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Sales	$ 238,213	$ 247,095	$ 442,308	$ 440,852
Operating Income (Loss)	9,935	34,939	10,182	34,976
Energy & Chemicals [Member]
Segment Reporting Information [Line Items]
Sales	40,018	61,195	79,885	99,154
Operating Income (Loss)	(2,568)	22,124	(2,749)	19,926
Distribution & Storage [Member]
Segment Reporting Information [Line Items]
Sales	137,518	129,600	250,776	237,097
Operating Income (Loss)	16,577	13,005	28,170	22,835
BioMedical [Member]
Segment Reporting Information [Line Items]
Sales	60,677	56,300	111,647	104,601
Operating Income (Loss)	9,848	10,552	14,848	17,204
Corporate [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (13,922)	$ (10,742)	$ (30,087)	$ (24,989)

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+ 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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