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Restructuring Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve   $ 7,324 $ 5,832
Severance Costs   10,928 4,810
Severance Costs     7,448
Restructuring Charges   10,928  
Payments for Restructuring   (9,436)  
Cost of Sales [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs   4,412 1,700
Selling, General and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs   6,516 2,960
Asset Impairment [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs     150
Corporate [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve   3,025 850
Restructuring Charges   4,167  
Payments for Restructuring   (1,992)  
BioMedical [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve   1,308 430
Restructuring Charges   1,957  
Payments for Restructuring   (1,079)  
Energy & Chemicals [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve   127 1,106
Restructuring Charges   962  
Payments for Restructuring   (1,941)  
Distribution & Storage [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve   2,864 $ 3,446
Restructuring and Related Cost, Expected Cost Remaining   2,152  
Restructuring Charges   3,842  
Payments for Restructuring   $ (4,424)  
Scenario, Forecast [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs $ 10,400    
Scenario, Forecast [Member] | Corporate [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs 3,300    
Scenario, Forecast [Member] | BioMedical [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs 2,900    
Scenario, Forecast [Member] | Energy & Chemicals [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs 3,000    
Scenario, Forecast [Member] | Distribution & Storage [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs $ 1,200