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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, 2011 $ 1,938,615 $ 3,826 $ 2,986,240 $ (1,306) $ (1,050,145)
Shareholders' Equity, shares beginning of period at Dec. 31, 2011   382,608      
Stock option exercises 27,432 24 27,408 0 0
Stock option exercises, shares   2,403      
Stock awards, net of cancellations   13 (13)    
Stock awards, net of cancellations, shares   1,316      
Stock repurchases (961) (1) (813)   (147)
Stock repurchases, shares   (104)      
Stock-based compensation 9,384 0 9,384 0 0
Share-based compensation, shares           
Net income 147,403       147,403
Other comprehensive income 173     173  
Shareholders' Equity end of period at Sep. 30, 2012 2,122,046 3,862 3,022,206 (1,133) (902,889)
Shareholders' Equity, shares end of period at Sep. 30, 2012   386,223      
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)    
Stock awards, net of cancellations, shares   700      
Cash dividends declared (38,462)       (38,462)
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