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Consolidated Statements Of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Shareholders' Equity, shares beginning of period (shares) at Dec. 31, 2016   319,090      
Shareholders' Equity beginning of period at Dec. 31, 2016 $ 4,659,363 $ 3,191 $ 3,116,490 $ (526) $ 1,540,208
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of accounting change (see Note 1) 18,237   (406)   18,643
Stock option exercises (shares)   1,378      
Stock option exercises 15,966 $ 14 15,952    
Stock issuances, net of cancellations (shares)   729      
Stock issuances, net of cancellations 3,564 $ 10 3,554    
Dividends declared (56,941)       (56,941)
Share repurchases (shares)   (17,498)      
Share repurchases (405,819) $ (178)     (405,641)
Share-based compensation 17,323   17,323    
Net income 192,268       192,268
Other comprehensive income 41     41  
Shareholders' Equity, shares end of period (shares) at Jun. 30, 2017   303,699      
Shareholders' Equity end of period at Jun. 30, 2017 4,444,002 $ 3,037 3,152,913 (485) 1,288,537
Shareholders' Equity, shares beginning of period (shares) at Dec. 31, 2017   286,752      
Shareholders' Equity beginning of period at Dec. 31, 2017 4,154,026 $ 2,868 3,171,542 (445) 980,061
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of accounting change (see Note 1) 22,411   0   22,411
Stock option exercises (shares)   434      
Stock option exercises 4,467 $ 4 4,463    
Stock issuances, net of cancellations (shares)   870      
Stock issuances, net of cancellations 3,483 $ 8 3,475    
Dividends declared (51,966)       (51,966)
Share repurchases (shares)   (3,694)      
Share repurchases (112,491) $ (37) (284)   (112,170)
Share-based compensation 11,891   11,891    
Net income 494,841       494,841
Other comprehensive income 50     50  
Shareholders' Equity, shares end of period (shares) at Jun. 30, 2018   284,362      
Shareholders' Equity end of period at Jun. 30, 2018 $ 4,526,712 $ 2,843 $ 3,191,087 $ (395) $ 1,333,177