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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)   620      
Stock option exercises 7,222 $ 6 7,216    
Stock issuances, net of cancellations (shares)   442      
Stock issuances, net of cancellations 7,423 $ 4 7,419    
Dividends declared (58,227)   8   (58,235)
Share repurchases (322,066) $ (157)     (321,909)
Share repurchases (shares)   (15,702)      
Share-based compensation 10,233   10,233   0
Excess tax benefits (deficiencies) from share-based awards (1,617)   (1,617)    
Net income 158,295       158,295
Other comprehensive income 42     42  
Shareholders' Equity end of period at Jun. 30, 2015 4,606,259 $ 3,548 3,096,255 (648) 1,507,104
Shareholders' Equity, shares end of period (shares) at Jun. 30, 2015   354,819      
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)   67      
Stock option exercises 742 $ 0 742    
Stock issuances, net of cancellations (shares)   499      
Stock issuances, net of cancellations 8,856 $ 5 8,851    
Dividends declared (62,747)   0   (62,747)
Share repurchases (100,806) $ (58)     (100,748)
Share repurchases (shares)   (5,819)      
Share-based compensation 12,209   12,209    
Excess tax benefits (deficiencies) from share-based awards (563)   (563)    
Net income 201,060       201,060
Other comprehensive income 41     41  
Shareholders' Equity end of period at Jun. 30, 2016 $ 4,818,117 $ 3,438 $ 3,115,041 $ (568) $ 1,700,206
Shareholders' Equity, shares end of period (shares) at Jun. 30, 2016   343,896