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Goodwill and Intangible Assets Goodwill (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
Goodwill [Roll Forward]  
Beginning Balance, Goodwill $ 405,522
Goodwill, Translation and Purchase Accounting Adjustments (1,649)
Goodwill, Acquired During Period 181
Ending Balance, Goodwill 404,054
Energy & Chemicals [Member]  
Goodwill [Roll Forward]  
Beginning Balance, Goodwill 92,638
Goodwill, Translation and Purchase Accounting Adjustments 8
Goodwill, Acquired During Period 0
Ending Balance, Goodwill 92,646
Distribution & Storage [Member]  
Goodwill [Roll Forward]  
Beginning Balance, Goodwill 157,248
Goodwill, Translation and Purchase Accounting Adjustments (1,657)
Goodwill, Acquired During Period 181
Ending Balance, Goodwill 155,772
BioMedical [Member]  
Goodwill [Roll Forward]  
Beginning Balance, Goodwill 155,636
Goodwill, Translation and Purchase Accounting Adjustments 0
Goodwill, Acquired During Period 0
Ending Balance, Goodwill $ 155,636