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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)

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