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Consolidated Statement Of Changes In Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
Treasury Stock
Balance at Dec. 31, 2011 $ 2,516,631 $ 1,833 $ 840,731 $ 2,279,367 $ 19,459 $ (624,759)
Balance (in shares) at Dec. 31, 2011 183,295,350 183,295,000        
Net income 189,812     189,812    
Foreign currency translation adjustment (612)       (612)  
Issuance of restricted stock (in shares)   788,000        
Issuance of restricted stock   8 (8)      
Vesting of stock unit awards   8,000        
Forfeitures of restricted stock (in shares)   (51,000)        
Forfeitures of restricted stock   (1) 1      
Exercise of stock options (in shares) 13,300 13,000        
Exercise of stock options 195   195      
Stock-based compensation 11,240   11,240      
Tax expense related to stock-based compensation (1,208)   (1,208)      
Payment of cash dividends (15,438)     (15,438)    
Purchase of treasury stock (71,337)         (71,337)
Balance at Jun. 30, 2012 $ 2,629,283 $ 1,840 $ 850,951 $ 2,453,741 $ 18,847 $ (696,096)
Balance (in shares) at Jun. 30, 2012 184,053,434 184,053,000