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Segment and Geographic Information Goodwill by Segment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]      
Goodwill $ 398,905 $ 398,941 $ 288,770
Foreign currency translation adjustments and other (344) 408  
Goodwill acquired during the year 308 109,763  
Energy & Chemicals [Member]
      
Goodwill [Line Items]      
Goodwill 83,215 83,215 83,215
Foreign currency translation adjustments and other 0 0  
Goodwill acquired during the year 0 0  
Distribution & Storage [Member]
      
Goodwill [Line Items]      
Goodwill 160,054 158,789 158,381
Foreign currency translation adjustments and other 957 408  
Goodwill acquired during the year 308 0  
BioMedical [Member]
      
Goodwill [Line Items]      
Goodwill 155,636 156,937 47,174
Foreign currency translation adjustments and other (1,301) 0  
Goodwill acquired during the year $ 0 $ 109,763