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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 (Loss) [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 awards, net of cancellations   11 (11)    
Stock awards, net of cancellations, shares   1,134      
Stock repurchases (845) (1) (727)   (117)
Stock repurchases, shares   (93)      
Stock-based compensation 2,667 0 2,667 0 0
Share-based compensation, shares           
Net income (loss) (11,666)       (11,666)
Other comprehensive income (loss) 57     57  
Shareholders' Equity end of period at Mar. 31, 2012 1,928,828 3,836 2,988,169 (1,249) (1,061,928)
Shareholders' Equity, shares end of period at Mar. 31, 2012   383,649      
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 options exercised 7,537 7 7,530 0 0
Stock option exercises, shares   669      
Stock awards, net of cancellations   5 (5)    
Stock awards, net of cancellations, shares   563      
Stock repurchases (6,427) (3) (2,587)   (3,837)
Stock repurchases, shares   (330)      
Stock-based compensation 2,979    2,979 0 0
Share-based compensation, shares           
Net income (loss) 81,762       81,762
Other comprehensive income (loss) 48     48  
Shareholders' Equity end of period at Mar. 31, 2013 $ 2,275,515 $ 3,875 $ 3,038,806 $ (944) $ (766,222)
Shareholders' Equity, shares end of period at Mar. 31, 2013   387,510