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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   1,043      
Stock repurchases (1,956) (2) (1,963)   (9)
Stock repurchases, shares   (252)      
Stock-based compensation 11,405 0 11,405 0 0
Net income (loss) (94,911)       (94,911)
Other comprehensive income (loss) 22     22  
Shareholders' Equity end of period at Jun. 30, 2011 2,049,727 3,828 2,982,351 (1,497) (934,955)
Shareholders' Equity, shares end of period at Jun. 30, 2011   382,819      
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   12 (12)    
Stock awards, net of cancellations, shares   1,235      
Stock repurchases (908) (1) (785)   (122)
Stock repurchases, shares   (101)      
Stock-based compensation 6,455 0 6,455 0 0
Net income (loss) 30,770       30,770
Other comprehensive income (loss) 115     115  
Shareholders' Equity end of period at Jun. 30, 2012 $ 1,975,047 $ 3,837 $ 2,991,898 $ (1,191) $ (1,019,497)
Shareholders' Equity, shares end of period at Jun. 30, 2012   383,742