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Consolidated Statements Of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Shareholders' Equity, shares at Dec. 31, 2016   319,090,000      
Shareholders' Equity at Dec. 31, 2016 $ 4,659,363 $ 3,191 $ 3,116,490 $ (526) $ 1,540,208
Stock option exercises, shares   2,352,000      
Stock option exercises 27,720 $ 24 27,696    
Share issuances, net of cancellations, shares   1,008,000      
Share issuances 3,568 $ 13 3,555    
Dividends declared (110,046)       (110,046)
Share repurchases, shares   (35,698,000)      
Share repurchases (910,331) $ (360)     (909,971)
Cash paid for shares withheld for taxes         5,995
Excess tax benefits (deficiencies) from share-based compensation (5,995)        
Share-based compensation 24,207   24,207    
Net income 447,221       447,221
Other comprehensive income 81     81  
Shareholders' Equity, shares at Dec. 31, 2017   286,752,000      
Shareholders' Equity at Dec. 31, 2017 4,154,026 $ 2,868 3,171,542 (445) 980,061
Stock option exercises, shares   605,000      
Stock option exercises 6,555 $ 6 6,549    
Share issuances, net of cancellations, shares   1,210,000      
Share issuances 3,487 $ 12 3,475    
Dividends declared (108,489)       (108,489)
Share repurchases, shares   (11,457,000)      
Share repurchases (294,566) $ (115)     (294,451)
Cash paid for shares withheld for taxes 7,910   284   7,626
Share-based compensation 20,145   20,145    
Net income 1,022,023       1,022,023
Other comprehensive income $ 100     100  
Shareholders' Equity, shares at Dec. 31, 2018 277,109,507 277,110,000      
Shareholders' Equity at Dec. 31, 2018 $ 4,817,782 $ 2,771 3,201,427 (345) 1,613,929
Stock option exercises, shares   547,000      
Stock option exercises 6,399 $ 5 6,394    
Share issuances, net of cancellations, shares   1,013,000      
Share issuances 5,800 $ 10 5,790    
Dividends declared (124,356)       (124,356)
Share repurchases, shares   (8,435,000)      
Share repurchases (274,333) $ (84)     (274,249)
Cash paid for shares withheld for taxes 11,450       11,450
Share-based compensation 21,538   21,538    
Net income 1,016,700       1,016,700
Other comprehensive income $ 100     100  
Shareholders' Equity, shares at Dec. 31, 2019 270,235,297 270,235,000      
Shareholders' Equity at Dec. 31, 2019 $ 5,458,180 $ 2,702 $ 3,235,149 $ (245) $ 2,220,574