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Debt (Narrative) (Details)
€ in Thousands
1 Months Ended 9 Months Ended
Sep. 19, 2018
USD ($)
Jul. 23, 2018
USD ($)
Feb. 28, 2017
USD ($)
Sep. 30, 2018
EUR (€)
Oct. 19, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 31, 2014
USD ($)
Debt Instrument [Line Items]                  
Borrowings under lines of credit and overdrafts           $ 63,000 $ 5,669,000    
Debt covenant ratio of senior debt to EBITDA       3.25   3.25      
Debt covenant ratio of total debt to EBITDA       3.75   3.75      
Debt covenant ratio of EBITDA to cash interest expense       4.25   4.25      
Liabilities incurred   $ 3,502,000              
Revolving Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Carrying amount of debt           $ 455,648,000 421,500,000    
Line of credit facility, maximum borrowing capacity               $ 750,000,000  
Line of credit facility with accordian feature, maximum borrowing capacity               $ 250,000,000  
Remaining borrowing capacity           394,352,000 428,500,000    
Revolving Credit Agreement [Member] | Euro Member Countries, Euro                  
Debt Instrument [Line Items]                  
Carrying amount of debt       € 171,350   $ 199,648,000 $ 0    
Stated interest rate       2.34%   2.34% 2.65%    
Revolving Credit Agreement [Member] | International Subsidiary Borrowings [Member]                  
Debt Instrument [Line Items]                  
Carrying amount of debt       € 179,000   $ 208,589,000      
Senior Notes [Member] | 3.97% Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Carrying amount of debt           100,000,000 $ 100,000,000    
Stated interest rate                 3.97%
Converted amount with accrued interest                 $ 100,000,000
Percent allowed to be prepaid                 100.00%
Lines of Credit [Member]                  
Debt Instrument [Line Items]                  
Borrowings under lines of credit and overdrafts           0 $ 5,300,000    
Line of credit facility, maximum borrowing capacity           59,000,000      
Line of credit, interest rate at period end             2.33%    
Bank Overdrafts [Member]                  
Debt Instrument [Line Items]                  
Borrowings under lines of credit and overdrafts           62,000 $ 369,000    
Repayment period       2 days          
Capital Lease Obligations [Member]                  
Debt Instrument [Line Items]                  
Carrying amount of debt           6,974,000 4,541,000    
Foreign Bank Borrowings [Member]                  
Debt Instrument [Line Items]                  
Carrying amount of debt           $ 520,000 $ 886,000    
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     $ 850,000,000            
Debt fees and expenses     2,542,000            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | United Kingdom, Pounds                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     600,000,000            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Euro Member Countries, Euro                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     600,000,000            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Switzerland, Francs                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     $ 600,000,000            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | one-month LIBOR [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Variable basis spread     1.10%            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | one-month LIBOR [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Variable basis spread     1.70%            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Base Rate [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Variable basis spread     0.10%            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Base Rate [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Variable basis spread     0.70%            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Euribor [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate     0.00%            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Euribor [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Variable basis spread     1.10%            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Euribor [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Variable basis spread     1.70%            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022, Accordion Feature [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     $ 350,000,000            
SPA with Gimatic [Member]                  
Debt Instrument [Line Items]                  
Percent acquired 100.00%                
Liabilities incurred $ 150,000,000                
Subsequent Event [Member] | Revolving Credit Agreement [Member] | Fifth Amendment, Maturity February 2022 [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity         $ 1,000,000,000        
Line of credit facility with accordian feature, maximum borrowing capacity         $ 200,000,000