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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)

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