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Reportable Segments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Sales $ 264,047 $ 293,841 $ 779,404 $ 866,891
Operating Income (Loss) 15,609 40,355 55,695 96,545
Energy & Chemicals [Member]        
Segment Reporting Information [Line Items]        
Sales 78,388 98,759 257,197 277,859
Operating Income (Loss) 11,180 22,993 47,120 55,642
Distribution & Storage [Member]        
Segment Reporting Information [Line Items]        
Sales 129,590 140,203 356,474 418,830
Operating Income (Loss) 8,255 22,005 30,897 64,314
BioMedical [Member]        
Segment Reporting Information [Line Items]        
Sales 56,069 54,879 165,733 170,202
Operating Income (Loss) 6,151 5,960 16,029 15,779
Corporate [Member]        
Segment Reporting Information [Line Items]        
Operating Income (Loss) $ (9,977) $ (10,603) $ (38,351) $ (39,190)