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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended
Jun. 02, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 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       $ 759,000  
Unrecognized compensation cost   $ 86,667,000   86,667,000  
Total intrinsic value of options exercised       23,814,000  
Aggregate intrinsic value of options exercisable   $ 125,738,000   $ 125,738,000  
Market value of Company's common stock (in USD per share)   $ 61.97   $ 61.97  
Weighted average exercise price per share (in USD per share)   $ 40.35   $ 40.35  
Total options outstanding (in shares)   17,345   17,345  
Total options exercisable (in shares)   5,814   5,814  
Dividends declared per common share (in USD per share) $ 0.37 $ 0.37 $ 0.35 $ 0.37 $ 0.35
Cash dividends declared   $ 52,389,000 $ 51,462,000 $ 52,389,000 $ 51,462,000
Common Stock Buyback          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares purchased and retired (in shares)       3,238  
Company purchased, cost       $ 196,158,000  
Additional authorized amount in the stock repurchase program $ 250,000,000        
Remaining stock repurchase authorization amount   $ 246,669,000   $ 246,669,000  
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