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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $)
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
Treasury Stock
Balance at Dec. 31, 2011 $ 2,516,631,000 $ 1,833,000 $ 840,731,000 $ 2,279,367,000 $ 19,459,000 $ (624,759,000)
Balance (in shares) at Dec. 31, 2011 183,295,350 183,295,000        
Net income 97,274,000     97,274,000    
Foreign currency translation adjustment 2,554,000       2,554,000  
Issuance of restricted stock   12,000        
Forfeitures of restricted stock   (5,000)        
Exercise of stock options (in shares) 13,300 14,000        
Exercise of stock options 195,000   195,000      
Stock-based compensation 5,458,000   5,458,000      
Tax expense/benefit related to stock-based compensation 166,000   166,000      
Payment of cash dividends (7,788,000)     (7,788,000)    
Purchase of treasury stock (15,000)         (15,000)
Balance at Mar. 31, 2012 $ 2,614,475,000 $ 1,833,000 $ 846,550,000 $ 2,368,853,000 $ 22,013,000 $ (624,774,000)
Balance (in shares) at Mar. 31, 2012 183,315,514 183,316,000