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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, 2015   349,149      
Shareholders' Equity beginning of period at Dec. 31, 2015 $ 4,759,325 $ 3,491 $ 3,093,802 $ (609) $ 1,662,641
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock option exercises (shares)   498      
Stock option exercises 5,845 $ 5 5,840    
Stock issuances, net of cancellations (shares)   523      
Stock issuances, net of cancellations 8,856 $ 5 8,851    
Dividends declared (93,127)       (93,127)
Share repurchases (shares)   (17,856)      
Share repurchases (350,846) $ (177)     (350,669)
Share-based compensation 12,976   12,976    
Excess tax benefits (deficiencies) from share-based awards (588)   (588)    
Net income 329,530       329,530
Other comprehensive income 61     61  
Shareholders' Equity, shares end of period (shares) at Sep. 30, 2016   332,314      
Shareholders' Equity end of period at Sep. 30, 2016 4,672,032 $ 3,324 3,120,881 (548) 1,548,375
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)   1,954      
Stock option exercises 22,765 $ 20 22,745    
Stock issuances, net of cancellations (shares)   741      
Stock issuances, net of cancellations 3,565 $ 10 3,555    
Dividends declared (83,685)       (83,685)
Share repurchases (shares)   (27,849)      
Share repurchases (665,812) $ (281)     (665,531)
Share-based compensation 20,784   20,784    
Net income 369,807       369,807
Other comprehensive income 61     61  
Shareholders' Equity, shares end of period (shares) at Sep. 30, 2017   293,936      
Shareholders' Equity end of period at Sep. 30, 2017 $ 4,345,085 $ 2,940 $ 3,163,168 $ (465) $ 1,179,442