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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended
May 29, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jul. 23, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost   $ 55,538,000   $ 55,538,000    
Total intrinsic value of options exercised       21,816,000    
Aggregate intrinsic value of options exercisable   $ 192,595,000   $ 192,595,000    
Market value of Company's common stock (in USD per share)   $ 56.10   $ 56.10    
Weighted average exercise price per share (in USD per share)   $ 33.55   $ 33.55    
Total options outstanding (in shares)   14,784   14,784    
Total options exercisable (in shares)   8,540   8,540    
Dividends declared per common share (in USD per share) $ 0.33 $ 0.33 $ 0.30 $ 0.33 $ 0.30  
Cash dividends declared   $ 49,984,000 $ 47,139,000 $ 49,984,000 $ 47,139,000  
Common Stock Buyback            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares purchased and retired (in shares)       3,550    
Company purchased, cost       $ 185,817,000    
Remaining stock repurchase authorization amount   $ 30,061,000   $ 30,061,000    
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    
Subsequent Event | Common Stock Buyback            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Remaining stock repurchase authorization amount           $ 280,061,000
Stock repurchase program, authorized amount           $ 250,000,000