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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 9 Months Ended
Jun. 03, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Oct. 20, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost   $ 59,056,000   $ 59,056,000    
Total intrinsic value of options exercised       25,788,000    
Aggregate intrinsic value of options exercisable   $ 96,715,000   $ 96,715,000    
Market value of Company's common stock (in USD per share)   $ 50.72   $ 50.72    
Weighted average exercise price per share (in USD per share)   $ 38.11   $ 38.11    
Total options outstanding (in shares)   14,767   14,767    
Total options exercisable (in shares)   7,352   7,352    
Dividends declared per common share (in USD per share) $ 0.35 $ 0 $ 0 $ 0.35 $ 0.33  
Cash dividends declared       $ 51,462,000 $ 49,984,000  
Common Stock Buyback            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares purchased and retired (in shares)       6,185    
Company purchased, cost       $ 325,644,000    
Remaining stock repurchase authorization amount   $ 41,885,000   $ 41,885,000    
Common Stock Buyback | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Remaining stock repurchase authorization amount           $ 291,885,000
Increase in the stock repurchase program by an additional           $ 250,000,000
2014 Plan | Tranche One            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate       50.00%    
2014 Plan | Tranche Two            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate       50.00%    
Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award waiting period       2 years    
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award waiting period       4 years