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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 02, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Increase (decrease) in stock-based compensation from change in management's estimate       $ 3,209 $ 0
Unrecognized compensation cost   $ 72,399   72,399  
Total intrinsic value of options exercised       30,496  
Aggregate intrinsic value of options exercisable   $ 104,146   $ 104,146  
Market value of Company's common stock (in USD per share)   $ 59.30   $ 59.30  
Weighted average exercise price per share (in USD per share)   $ 40.63   $ 40.63  
Total options outstanding (in shares)   16,925   16,925  
Total options exercisable (in shares)   5,578   5,578  
Dividends declared per common share (in USD per share) $ 0.37 $ 0 $ 0 $ 0.37 $ 0.35
Cash dividends declared       $ 52,389 $ 51,462
Common Stock Buyback          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares purchased and retired (in shares)       5,218  
Company purchased, cost       $ 316,053  
Remaining stock repurchase authorization amount   $ 126,775   $ 126,775  
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