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Asset Impairments (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share Price   $ 17.96 $ 34.20 $ 95.64
Goodwill and Intangible Asset Impairment $ 0 $ 207,672    
Impairment of Intangible Assets, Finite-lived 542 38,083    
Impairment of Long-Lived Assets Held-for-use 675 9,361    
Asset impairments 1,217 253,560 $ 0  
Asset Impairments Charges and Other PP&E Impairment 1,217 255,116 $ 0  
Energy & Chemicals [Member]        
Goodwill and Intangible Asset Impairment   65,023    
Impairment of Intangible Assets, Finite-lived   0    
Impairment of Long-Lived Assets Held-for-use   3,773    
Asset Impairments Charges and Other PP&E Impairment   68,796    
Distribution & Storage [Member]        
Goodwill and Intangible Asset Impairment 0 316    
Impairment of Intangible Assets, Finite-lived 542 0    
Impairment of Long-Lived Assets Held-for-use 675 1,704 [1]    
Asset Impairments Charges and Other PP&E Impairment $ 1,217 2,020    
BioMedical [Member]        
Goodwill and Intangible Asset Impairment   142,333    
Impairment of Intangible Assets, Finite-lived   38,083    
Impairment of Long-Lived Assets Held-for-use   3,884    
Asset Impairments Charges and Other PP&E Impairment   184,300    
Energy & Chemical and BioMedical [Member]        
Impairment of Long-Lived Assets Held-for-use   7,657    
Customer Relationships [Member]        
Impairment of Intangible Assets, Finite-lived   15,667    
Unpatented Technology [Member]        
Impairment of Intangible Assets, Finite-lived   22,417    
Cost of Sales [Member]        
Asset impairments   $ 1,556    
[1] Asset impairments of $1,556 were included in cost of sales on the consolidated statement of operations for the year ended December 31, 2015.