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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)   564      
Stock option exercises 6,596 $ 6 6,590    
Stock issuances, net of cancellations (shares)   358      
Stock issuances, net of cancellations 7,423 $ 3 7,420    
Dividends declared (29,449)   0   (29,449)
Share repurchases (107,955) $ (50)     (107,905)
Share repurchases (shares)   (4,954)      
Share-based compensation 5,662   5,662   0
Excess tax benefits (deficiencies) from share-based awards (229)   (229)    
Net income 54,971       54,971
Other comprehensive income 21     21  
Shareholders' Equity end of period at Mar. 31, 2015 4,741,994 $ 3,654 3,092,439 (669) 1,646,570
Shareholders' Equity, shares end of period (shares) at Mar. 31, 2015   365,427      
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)   4      
Stock option exercises 52 $ 0 52    
Stock issuances, net of cancellations (shares)   456      
Stock issuances, net of cancellations 8,856 $ 4 8,852    
Dividends declared (31,459)   0   (31,459)
Share repurchases (52,745) $ (32)     (52,713)
Share repurchases (shares)   (3,226)      
Share-based compensation 6,635   6,635    
Excess tax benefits (deficiencies) from share-based awards (458)   (458)    
Net income 83,300       83,300
Other comprehensive income 21     21  
Shareholders' Equity end of period at Mar. 31, 2016 $ 4,773,527 $ 3,463 $ 3,108,883 $ (588) $ 1,661,769
Shareholders' Equity, shares end of period (shares) at Mar. 31, 2016   346,383