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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Sales	$ 306,810	$ 298,266	$ 573,050	$ 571,914
Operating Income (Loss)	34,044	32,979	56,190	60,330
Energy & Chemicals [Member]
Segment Reporting Information [Line Items]
Sales	92,954	78,716	179,100	159,577
Operating Income (Loss)	16,042	14,914	32,649	27,733
Distribution & Storage [Member]
Segment Reporting Information [Line Items]
Sales	149,105	147,156	278,627	275,889
Operating Income (Loss)	24,222	23,393	42,309	42,682
BioMedical [Member]
Segment Reporting Information [Line Items]
Sales	64,751	72,394	115,323	136,448
Operating Income (Loss)	7,424	8,752	9,819	15,505
Corporate [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (13,644)	$ (14,080)	$ (28,587)	$ (25,590)

X

- Definition

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

+ References

No definition available.

+ Details

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X

- 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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