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Debt (Narrative) (Details)
€ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 19, 2018
USD ($)
Oct. 31, 2018
Mar. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Oct. 19, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 28, 2017
USD ($)
Oct. 31, 2014
USD ($)
Debt Instrument [Line Items]                      
Borrowings under lines of credit and overdrafts         $ 23,051,000   $ 2,137,000        
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            
Revolving Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Carrying amount of debt         $ 772,737,000   831,016,000        
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         227,263,000   168,984,000        
Revolving Credit Agreement [Member] | Euro Member Countries, Euro                      
Debt Instrument [Line Items]                      
Carrying amount of debt     € 490,080   $ 550,237,000 € 470,350 $ 538,316,000        
Stated interest rate     1.82%   1.82% 1.99% 1.99%        
Revolving Credit Agreement [Member] | International Subsidiary Borrowings [Member]                      
Debt Instrument [Line Items]                      
Carrying amount of debt     € 44,100   $ 49,506,000 € 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         23,000,000   $ 2,041,000        
Line of credit facility, maximum borrowing capacity         $ 87,000,000            
Line of credit, interest rate at period end     3.21%   3.21% 0.17% 0.17%        
Bank Overdrafts [Member]                      
Debt Instrument [Line Items]                      
Borrowings under lines of credit and overdrafts         $ 51,000   $ 96,000        
Repayment period     2 days                
Capital Lease Obligations [Member]                      
Debt Instrument [Line Items]                      
Carrying amount of debt         9,400,000   10,216,000        
Foreign Bank Borrowings [Member]                      
Debt Instrument [Line Items]                      
Carrying amount of debt         634,000   $ 647,000        
Revolving Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Covenant, Threshold for Permitted Acquisition         $ 150,000,000            
Debt Instrument, Covenant, Material Acquisition, Consolidated Senior Credit to Consolidated EBITDA     3.50   3.50            
Debt Instrument, Covenant, Material Acquisition, Total Consolidated Debt to Consolidated EBITDA     4.25   4.25            
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member]                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity                   $ 850,000,000  
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] | Euribor [Member]                      
Debt Instrument [Line Items]                      
Stated interest rate   0.00%                  
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      
Debt fees and expenses       $ 529,000              
Revolving Credit Agreement [Member] | Fifth Amendment, Maturity February 2022 [Member] | one-month LIBOR [Member] | Minimum [Member]                      
Debt Instrument [Line Items]                      
Variable basis spread   1.10%                  
Revolving Credit Agreement [Member] | Fifth Amendment, Maturity February 2022 [Member] | one-month LIBOR [Member] | Maximum [Member]                      
Debt Instrument [Line Items]                      
Variable basis spread   1.70%                  
Revolving Credit Agreement [Member] | Fifth Amendment, Maturity February 2022 [Member] | Base Rate [Member] | Minimum [Member]                      
Debt Instrument [Line Items]                      
Variable basis spread   0.10%                  
Revolving Credit Agreement [Member] | Fifth Amendment, Maturity February 2022 [Member] | Base Rate [Member] | Maximum [Member]                      
Debt Instrument [Line Items]                      
Variable basis spread   0.70%                  
Revolving Credit Agreement [Member] | Fifth Amendment, Maturity February 2022 [Member] | Euribor [Member] | Minimum [Member]                      
Debt Instrument [Line Items]                      
Variable basis spread   1.10%                  
Revolving Credit Agreement [Member] | Fifth 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]                      
Business Combination, Consideration Transferred, Liabilities Incurred $ 150,000,000