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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, 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 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 0 2,979 0 0
Share-based compensation, shares           
Net income 81,762       81,762
Other comprehensive income 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      
Shareholders' Equity beginning of period at Dec. 31, 2013 4,648,952 3,813 3,052,016 (795) 1,593,918
Shareholders' Equity, shares beginning of period at Dec. 31, 2013   381,300      
Stock option exercises 5,295 5 5,290 0 0
Stock option exercises, shares   489      
Stock awards, net of cancellations   (1) 1    
Stock awards, net of cancellations, shares   (99)      
Cash dividends declared (19,087)       (19,087)
Stock repurchases (50,105) (25)     (50,080)
Stock repurchases, shares   (2,511)      
Stock-based compensation 4,191 0 4,191 0 0
Share-based compensation, shares           
Excess tax benefits (deficiencies) from share-based awards (42)   (42)    
Net income 74,819       74,819
Other comprehensive income 40     40  
Shareholders' Equity end of period at Mar. 31, 2014 $ 4,664,063 $ 3,792 $ 3,061,456 $ (755) $ 1,599,570
Shareholders' Equity, shares end of period at Mar. 31, 2014   379,179