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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Sales | $ 293,841 | $ 301,757 | $ 866,891 | $ 873,671
Operating Income (Loss) | 40,355 | 35,886 | 96,545 | 96,216
Energy & Chemicals [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 98,759 | 79,986 | 277,859 | 239,563
Operating Income (Loss) | 22,993 | 14,493 | 55,642 | 42,226
Distribution & Storage [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 140,203 | 152,895 | 418,830 | 428,784
Operating Income (Loss) | 22,005 | 22,337 | 64,314 | 65,019
BioMedical [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 54,879 | 68,876 | 170,202 | 205,324
Operating Income (Loss) | 5,960 | 9,970 | 15,779 | 25,475
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | $ (10,603) | $ (10,914) | $ (39,190) | $ (36,504)

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