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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 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
Share-based compensation, shares           
Net income 30,770       30,770
Other comprehensive income 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      
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 18,544 14 18,530 0 0
Stock option exercises, shares   1,357      
Stock awards, net of cancellations   7 (7)    
Stock awards, net of cancellations, shares   719      
Stock repurchases (6,447) (3) (2,593)   (3,851)
Stock repurchases, shares   (331)      
Stock-based compensation 8,127 0 8,127 0 0
Share-based compensation, shares           
Net income 118,179       118,179
Other comprehensive income 196     196  
Shareholders' Equity end of period at Jun. 30, 2013 $ 2,328,215 $ 3,884 $ 3,054,946 $ (796) $ (729,819)
Shareholders' Equity, shares end of period at Jun. 30, 2013   388,353