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Statements of Changes in Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Capital In Excess Of Par Value [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2016 $ 1,851,158 $ 8,242 $ 135,466 $ 1,707,450
Balance, in shares at Dec. 31, 2016   82,417    
Net income 463,774     463,774
Share repurchases (8,013) $ (9)   (8,004)
Share repurchases, shares   (92)    
Cash dividends declared (32,963)     (32,963)
Share-based compensation and restricted share issuances, net of taxes   $ 5    
Share-based compensation and restricted share issuances, net of taxes, shares   51    
Share-based compensation and restricted share issuances, net of taxes     2,893  
Share-based compensation and restricted share issuances, net of taxes 2,898      
Balance at Dec. 31, 2017 2,276,854 $ 8,238 138,359 2,130,257
Balance, in shares at Dec. 31, 2017   82,376    
Net income 605,668     605,668
Share repurchases (163,265) $ (118)   (163,147)
Share repurchases, shares   (1,176)    
Cash dividends declared (42,594)     (42,594)
Share-based compensation and restricted share issuances, net of taxes   $ 3    
Share-based compensation and restricted share issuances, net of taxes, shares   31    
Share-based compensation and restricted share issuances, net of taxes     3,817  
Share-based compensation and restricted share issuances, net of taxes 3,820      
Balance at Dec. 31, 2018 2,680,483 $ 8,123 142,176 2,530,184
Balance, in shares at Dec. 31, 2018   81,231    
Net income 615,518     615,518
Share repurchases (240,960) $ (160)   (240,800)
Share repurchases, shares   (1,602)    
Cash dividends declared (54,584)     (54,584)
Reclassification of liability for modified equity awards 64,991   64,991  
Share-based compensation and restricted share issuances, net of taxes   $ 6    
Share-based compensation and restricted share issuances, net of taxes, shares   59    
Share-based compensation and restricted share issuances, net of taxes     15,263  
Share-based compensation and restricted share issuances, net of taxes 15,269      
Balance at Dec. 31, 2019 $ 3,080,717 $ 7,969 $ 222,430 $ 2,850,318
Balance, in shares at Dec. 31, 2019   79,688