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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 beginning of period at Dec. 31, 2014 $ 4,804,954 $ 3,695 $ 3,072,996 $ (690) $ 1,728,953
Shareholders' Equity, shares beginning of period (shares) at Dec. 31, 2014   369,459      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock option exercises (shares)   888      
Stock option exercises 10,371 $ 9 10,362    
Stock issuances, net of cancellations (shares)   431      
Stock issuances, net of cancellations 7,423 $ 4 7,419    
Dividends declared (86,296)   8   (86,304)
Share repurchases (442,738) $ (216)     (442,522)
Share repurchases (shares)   (21,641)      
Share-based compensation 13,556   13,556    
Excess tax benefits (deficiencies) from share-based awards (1,790)   (1,790)    
Net income 266,062       266,062
Other comprehensive income 63     63  
Shareholders' Equity end of period at Sep. 30, 2015 4,571,605 $ 3,492 3,102,551 (627) 1,466,189
Shareholders' Equity, shares end of period (shares) at Sep. 30, 2015   349,137      
Shareholders' Equity beginning of period at Dec. 31, 2015 4,759,325 $ 3,491 3,093,802 (609) 1,662,641
Shareholders' Equity, shares beginning of period (shares) at Dec. 31, 2015   349,149      
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 (350,846) $ (177)     (350,669)
Share repurchases (shares)   (17,856)      
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 end of period at Sep. 30, 2016 $ 4,672,032 $ 3,324 $ 3,120,881 $ (548) $ 1,548,375
Shareholders' Equity, shares end of period (shares) at Sep. 30, 2016   332,314