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Debt Textuals (Details)
€ in Thousands, $ in Thousands, SFr in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Rate
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
CHF (SFr)
Rate
Dec. 31, 2019
EUR (€)
Rate
Debt Instrument [Line Items]          
Debt, Weighted Average Interest Rate | Rate 3.30%     3.30% 3.30%
Senior Notes $ 714,351 $ 491,819      
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, before Tax 1,300 6,700 $ 18,200    
Cumulative (gain) loss in other other comprehensive income related to the change in a net investment hedge. 1,500        
Line of Credit Facility, Maximum Borrowing Capacity $ 1,100,000        
Debt Instrument, Covenant Description The agreements also require the Company to maintain a consolidated interest coverage ratio of not less than 3.5 to 1.0 and a consolidated leverage ratio of not more than 3.5 to 1.0.        
Debt Instrument, Covenant Compliance The Company was in compliance with its covenants at December 31, 2019.        
Debt Issuance Costs, Gross $ 3,400        
Debt Instrument, Basis Spread on Variable Rate | Rate 87.50%        
1.47% EURO Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Maturity Date Jun. 17, 2030        
Senior Notes $ 140,197 143,053     € 125,000
Debt Instrument, Interest Rate, Stated Percentage 1.47%     1.47% 1.47%
1.30% Euro-Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Maturity Date Nov. 06, 2034        
Senior Notes $ 151,413 $ 0     € 135,000
Debt Instrument, Interest Rate, Stated Percentage 1.30%     1.30% 1.30%
3.19% Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Maturity Date Jan. 24, 2035        
Senior Notes $ 50,000        
Debt Instrument, Interest Rate, Stated Percentage | Rate 3.19%     3.19% 3.19%
Swiss Pension Loans [Member]          
Debt Instrument [Line Items]          
Notes Payable, Related Parties $ 39,600        
Swiss Pension Loans (local currency) | SFr       SFr 38  
Debt Instrument, Basis Spread on Variable Rate | Rate 87.50%        
Line of Credit [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Maturity Date Jun. 15, 2023        
Line of Credit Facility, Remaining Borrowing Capacity $ 572,300        
Debt Instrument, Covenant Description The Company is required to maintain a ratio of funded debt to consolidated EBITDA of 3.5 to 1.0 or less and an interest coverage ratio of 3.5 to 1.0 or greater.        
Debt Instrument, Covenant Compliance The Company was in compliance with its covenants as of December 31, 2019.        
Debt Issuance Costs, Gross $ 2,000        
Debt Instrument, Basis Spread on Variable Rate | Rate 0.875%