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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Feb. 26, 2020
Mar. 18, 2019
Mar. 11, 2019
Feb. 27, 2018
Oct. 30, 2014
Stockholders' Equity [Line Items]              
Document Period End Date Mar. 31, 2020            
Treasury Stock, Value, Acquired, Cost Method $ 239,763            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 886,000 402,000          
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 0 2,411,194          
Translation adjustment $ 59,818 $ 16,156          
Debt Instrument, Convertible, Conversion Price       $ 188.73     $ 72.18
Share Price $ 85.72 $ 142.59          
Share Repurchase Plan [Member]              
Stockholders' Equity [Line Items]              
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     5,000,000.0     10,000,000.0  
Stock Repurchase Program, Authorized Amount     $ 250,000   $ 120,000 $ 375,000