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Consolidated Statements Of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated other Comprehensive Income (Loss)
Non Controlling Interest
Beginning Balance at Dec. 31, 2017 $ 931,700 $ 600 $ 733,900 $ 242,800 $ (45,600)  
Beginning Balance (in shares) at Dec. 31, 2017   63,100        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee stock compensation 64,000 $ 0 64,000      
Deferred compensation 4,800   (100) (4,700)    
Employee stock compensation (in shares)   200        
Proceeds from stock issuances under employee plans 47,100 $ 0 47,100      
Proceeds from stock issuances under employee plans (in shares)   800        
Cash dividends declared ($2.32 per share, $2.20 per share and $2.12 per share in 2017, 2016, and 2015 respectively) (149,000)     149,000    
Repurchase and retirement of common shares $ (348,700) $ 0 37,100 311,600    
Repurchase and retirement of common shares (in shares) (3,200) 3,200        
Noncontrolling Interest, Increase from Subsidiary Equity Issuance $ 300          
Net income 335,300     335,300    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 335,300          
Other comprehensive income (17,400)       (17,400)  
Ending Balance at Dec. 31, 2018 867,000 $ 600 808,000 121,100 (63,000)  
Ending Balance (in shares) at Dec. 31, 2018   60,900        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest           $ 300
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee stock compensation 74,900 $ 0 74,900      
Deferred compensation (6,700)   4,400 2,300    
Employee stock compensation (in shares)   400        
Proceeds from stock issuances under employee plans 15,700 $ 0 15,700      
Proceeds from stock issuances under employee plans (in shares)   200        
Cash dividends declared ($2.32 per share, $2.20 per share and $2.12 per share in 2017, 2016, and 2015 respectively) (149,100)     149,100    
Repurchase and retirement of common shares $ (8,400) $ 0 1,400 7,000    
Repurchase and retirement of common shares (in shares) (100) 100        
Cumulative effect of adoption of accounting standards $ 0     600 (600)  
Net income 324,000     324,000    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 323,900         (100)
Other comprehensive income (9,100)       (9,100)  
Ending Balance at Dec. 31, 2019 1,108,000          
Ending Balance (in shares) at Dec. 31, 2019   61,400        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,108,200 $ 600 892,800 287,300 (72,700) 200
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee stock compensation 65,300 $ 0 65,300      
Deferred compensation 1,300   (500) (800)    
Employee stock compensation (in shares)   600        
Proceeds from stock issuances under employee plans 33,600 $ 0 33,600      
Proceeds from stock issuances under employee plans (in shares)   500        
Cash dividends declared ($2.32 per share, $2.20 per share and $2.12 per share in 2017, 2016, and 2015 respectively) (152,500)     152,500    
Repurchase and retirement of common shares $ (50,300) $ 0 8,300 42,000    
Repurchase and retirement of common shares (in shares) (600) 600        
Net income $ 124,800          
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 124,900     124,800   100
Other comprehensive income 14,300       14,300  
Ending Balance at Dec. 31, 2020 1,144,500          
Ending Balance (in shares) at Dec. 31, 2020   61,900        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 1,144,800 $ 600 $ 983,900 $ 218,400 $ (58,400) $ 300