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Long-Term Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Mar. 29, 2019
Jun. 30, 2016
Jun. 30, 2016
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]            
Unamortized discounts and issuance costs of unsecured notes       $ 4,037   $ 3,052
Long-term Debt       656,984   421,948
Current portion, long-term debt       12,104   0
Long-term debt       644,880   421,948
Senior unsecured notes, maturity date     Jun. 15, 2021      
Net proceeds from credit facility and long-term debt, including current portion       723,054 $ 0  
Unsecured notes            
Debt Instrument [Line Items]            
Long-term Debt, Gross       425,000   425,000
Credit Agreement            
Debt Instrument [Line Items]            
Long-term Debt, Gross       236,021   $ 0
Term of agreement 5 years          
Three Point One Two Five Percent Senior Unsecured Notes Due June Fifteenth Twenty Twenty Five [Domain]            
Debt Instrument [Line Items]            
Senior unsecured notes, issued amount   $ 425,000 $ 425,000      
Senior unsecured notes, interest rate   3.125% 3.125%      
Senior unsecured notes, proceeds   $ 421,000        
Term of agreement     5 years      
Term Loan Facility            
Debt Instrument [Line Items]            
Net proceeds from credit facility and long-term debt, including current portion       100,000    
Swedish Kronor | Term Loan Facility            
Debt Instrument [Line Items]            
Senior unsecured notes, issued amount       150,000    
Net proceeds from credit facility and long-term debt, including current portion       $ 150,000    
Debt instrument, annual amortization (percent)       5.00%    
United States of America, Dollars | Term Loan Facility            
Debt Instrument [Line Items]            
Senior unsecured notes, issued amount       $ 100,000    
Debt instrument, annual amortization (percent)       5.00%