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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Feb. 27, 2018
Oct. 30, 2014
Stockholders' Equity [Line Items]                
Document Period End Date         Sep. 30, 2019      
Treasury Stock, Value, Acquired, Cost Method $ 39,751   $ 50,000 $ 125,000        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 751,000 436,000     841,000 792,000    
Translation adjustment $ (56,863) $ (4,613)     $ (60,887) $ (40,198)    
Debt Instrument, Convertible, Conversion Price $ 147.24       $ 147.24      
Share Price $ 83.77       $ 83.77      
Share Repurchase Plan [Member]                
Stockholders' Equity [Line Items]                
Treasury Stock, Value, Acquired, Cost Method         $ 39,800 $ 175,000    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased             10,000,000.0  
Stock Repurchase Program, Authorized Amount $ 160,200       160,200   $ 375,000  
2019 Share Repurchase Plan [Member]                
Stockholders' Equity [Line Items]                
Stock Repurchase Program, Authorized Amount $ 120,000       $ 120,000      
1.5% Issue [Member]                
Stockholders' Equity [Line Items]                
Debt Instrument, Convertible, Conversion Price               $ 72.18