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Debt Textuals (Details)
€ in Thousands, $ in Thousands, SFr in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Rate
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
CHF (SFr)
Rate
Dec. 31, 2018
EUR (€)
Rate
Debt Instrument          
Senior Notes $ 491,819 $ 498,298      
Combined Senior Notes 250,000        
Derivatives used in Net Investment Hedge, Increase (Decrease), Gross of Tax $ 6,700 18,200      
Consolidated Interest Coverage Ratio Covenant 3.5 to 1.0        
Consolidated Leverage Ratio Covenant 3.5 to 1.0        
Payments of Debt Issuance Costs $ 1,914 7,205 $ 680    
Credit Agreement Borrowing Capacity $ 1,100,000        
Debt Instrument, Basis Spread on Variable Rate | Rate 0.875%        
Debt, Weighted Average Interest Rate | Rate 3.31%     3.31% 3.31%
Swiss Pension Loans [Member]          
Debt Instrument          
Swiss Pension Loans (local currency) | SFr       SFr 38  
Notes Payable, Related Parties $ 39,600        
3.67% Senior Notes          
Debt Instrument          
Senior Notes, Stated Interest Rate 3.67%     3.67% 3.67%
Senior Notes $ 50,000 50,000      
Maturity Date Dec. 17, 2022        
Debt Instrument, Covenant Compliance The Company was in compliance with its covenants at December 31, 2018.        
Payments of Debt Issuance Costs $ 400        
Amortized Issuance Costs Period 10 years        
4.10% Senior Notes [Member]          
Debt Instrument          
Senior Notes, Stated Interest Rate 4.10%     4.10% 4.10%
Senior Notes $ 50,000 50,000      
Maturity Date Sep. 19, 2023        
Debt Instrument, Covenant Compliance The Company was in compliance with its covenants at December 31, 2018.        
Payments of Debt Issuance Costs $ 400        
Amortized Issuance Costs Period 10 years        
3.84% Senior Notes [Member]          
Debt Instrument          
Senior Notes, Stated Interest Rate 3.84%     3.84% 3.84%
Senior Notes $ 125,000 125,000      
Maturity Date Sep. 19, 2024        
Debt Instrument, Covenant Compliance The Company was in compliance with its covenants at December 31, 2018.        
Payments of Debt Issuance Costs $ 900        
Amortized Issuance Costs Period 10 years        
4.24% Senior Notes [Member]          
Debt Instrument          
Senior Notes, Stated Interest Rate 4.24%     4.24% 4.24%
Senior Notes $ 125,000 125,000      
Maturity Date Jun. 25, 2025        
Debt Instrument, Covenant Compliance The Company was in compliance with these covenants at December 31, 2018.        
1.47% EURO Senior Notes [Member]          
Debt Instrument          
Senior Notes, Stated Interest Rate 1.47%     1.47% 1.47%
Senior Notes $ 143,053 149,736     € 125,000
Maturity Date Jun. 17, 2030        
Debt Instrument, Covenant Compliance The Company was in compliance with its covenants at December 31, 2018.        
Payments of Debt Issuance Costs $ 400        
Amortized Issuance Costs Period 15 years        
Line of Credit [Member]          
Debt Instrument          
Maturity Date Jun. 15, 2023        
Consolidated Interest Coverage Ratio Covenant 3.5 to 1.0        
Consolidated Leverage Ratio Covenant 3.5 to 1.0        
Payments of Debt Issuance Costs $ 2,000        
Credit Agreement Borrowing Capacity   $ 800,000      
Line of Credit Facility, Remaining Borrowing Capacity $ 601,000