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Consolidated Statements Of Shareholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income [Member]
Retained Earnings (Accumulated Deficit) [Member]
Shareholders' Equity beginning of period at Dec. 31, 2012 $ 2,189,616 $ 3,866 $ 3,030,889 $ (992) $ (844,147)
Shareholders' Equity, shares beginning of period at Dec. 31, 2012   386,608      
Stock option exercises 18,549 14 18,535 0 0
Stock option exercises, shares   1,359      
Stock awards, net of cancellations   7 (7)    
Dividends (38,462)   0    
Cash dividends declared         (38,462)
Stock awards, net of cancellations, shares   700      
Stock repurchases (89,940) (56) (3,063)   (86,821)
Stock repurchases, shares   (5,609)      
Stock-based compensation 11,586 0 11,586 0 0
Share-based compensation, shares           
Net income 2,400,063       2,400,063
Other comprehensive income 273     273  
Shareholders' Equity end of period at Sep. 30, 2013 4,491,685 3,831 3,057,940 (719) 1,430,633
Shareholders' Equity, shares end of period at Sep. 30, 2013   383,058      
Shareholders' Equity beginning of period at Dec. 31, 2013 4,648,952 3,813 3,052,016 (795) 1,593,918
Shareholders' Equity, shares beginning of period at Dec. 31, 2013   381,300      
Stock option exercises 6,034 5 6,029 0 0
Stock option exercises, shares   554      
Dividends (56,689)   72    
Cash dividends declared         (56,761)
Stock awards, net of cancellations, shares   (42)      
Stock repurchases (155,140) (80)     (155,060)
Stock repurchases, shares   (8,034)      
Stock-based compensation 10,586 0 10,586 0 0
Share-based compensation, shares           
Excess tax benefits (deficiencies) from share-based awards (660)   (660)    
Net income 257,244       257,244
Other comprehensive income 82     82  
Shareholders' Equity end of period at Sep. 30, 2014 $ 4,710,409 $ 3,738 $ 3,068,043 $ (713) $ 1,639,341
Shareholders' Equity, shares end of period at Sep. 30, 2014   373,778