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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, 2010 $ 2,135,167 $ 3,820 $ 2,972,919 $ (1,519) $ (840,053)
Shareholders' Equity, shares beginning of period at Dec. 31, 2010   382,028      
Stock awards, net of cancellations   10 (10)    
Stock awards, net of cancellations, shares   1,020      
Stock repurchases (2,021) (2) (2,081)   (62)
Stock repurchases, shares   (267)      
Stock-based compensation 14,444 0 14,444 0 0
Net income (loss) (224,209)       (224,209)
Other comprehensive income (loss) 86     86  
Shareholders' Equity end of period at Sep. 30, 2011 1,923,467 3,828 2,985,272 (1,433) (1,064,200)
Shareholders' Equity, shares end of period at Sep. 30, 2011   382,781      
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 options exercised 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    9,384 0 0
Net income (loss) 147,403       147,403
Other comprehensive income (loss) 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