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Goodwill and Intangible Assets Goodwill (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Goodwill [Roll Forward]  
Beginning Balance, Goodwill $ 217,970
Goodwill, Translation and Purchase Accounting Adjustments 262
Goodwill, Acquired During Period 10,120
Ending Balance, Goodwill 228,352
Goodwill, Impaired, Accumulated Impairment Loss 195,846
Energy & Chemicals [Member]  
Goodwill [Roll Forward]  
Beginning Balance, Goodwill 27,873
Goodwill, Translation and Purchase Accounting Adjustments 0
Goodwill, Acquired During Period 10,120
Ending Balance, Goodwill 37,993
Goodwill, Impaired, Accumulated Impairment Loss 64,603
Distribution & Storage [Member]  
Goodwill [Roll Forward]  
Beginning Balance, Goodwill 165,520
Goodwill, Translation and Purchase Accounting Adjustments 262
Goodwill, Acquired During Period 0
Ending Balance, Goodwill 165,782
Goodwill, Impaired, Accumulated Impairment Loss 0
BioMedical [Member]  
Goodwill [Roll Forward]  
Beginning Balance, Goodwill 24,577
Goodwill, Translation and Purchase Accounting Adjustments 0
Goodwill, Acquired During Period 0
Ending Balance, Goodwill 24,577
Goodwill, Impaired, Accumulated Impairment Loss $ 131,243