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Condensed Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance at Dec. 31, 2010 $ 787,793 $ 500 $ 165,425 $ 607,241 $ 14,627  
Balance (in shares) at Dec. 31, 2010   50,096        
Increase (Decrease) in Stockholders' Equity            
Net income 45,951     45,951    
Translation adjustment (3,615)       (3,615)  
Stock options exercised 154   154      
Stock options exercised (in shares)   6        
Stock compensation 3,405   3,405      
Tax effect of options exercised (71)   (71)      
Repurchase of common stock (53,208)         (53,208)
Repurchase of common stock (in shares)   (1,948)        
Retirement of common stock   (19)   (53,189)   53,208
Cash dividends declared on common stock, $0.375, $0.125 and $0.375 per share for the period ended September 30, 2012, December 31, 2011 and September 30, 2011 respectively (18,331)     (18,331)    
Common stock issued at $33.71 and $30.91 per share for stock bonus for the period ended September 30, 2012 and September 30, 2011 respectively 204   204      
Common stock issued for stock bonus (in shares)   7        
Balance at Sep. 30, 2011 762,282 481 169,117 581,672 11,012  
Balance (in shares) at Sep. 30, 2011   48,161        
Increase (Decrease) in Stockholders' Equity            
Net income 4,949     4,949    
Translation adjustment (4,229)       (4,229)  
Stock options exercised 60   60      
Stock options exercised (in shares)   2        
Stock compensation 2,789   2,789      
Tax effect of options exercised (1,483)   (1,483)      
Cash dividends declared on common stock, $0.375, $0.125 and $0.375 per share for the period ended September 30, 2012, December 31, 2011 and September 30, 2011 respectively (6,005)     (6,005)    
Balance at Dec. 31, 2011 758,363 481 170,483 580,616 6,783  
Balance (in shares) at Dec. 31, 2011   48,163        
Increase (Decrease) in Stockholders' Equity            
Net income 36,036     36,036    
Translation adjustment 1,400       1,400  
Stock options exercised 2,184 1 2,183      
Stock options exercised (in shares)   90        
Stock compensation 7,048   7,048      
Tax effect of options exercised (60)   (60)      
Shares issued from release of Restricted Stock Units (1,110)   (1,110)      
Shares issued from release of Restricted Stock Units (in shares)   62        
Cash dividends declared on common stock, $0.375, $0.125 and $0.375 per share for the period ended September 30, 2012, December 31, 2011 and September 30, 2011 respectively (18,119)     (18,119)    
Common stock issued at $33.71 and $30.91 per share for stock bonus for the period ended September 30, 2012 and September 30, 2011 respectively 418   418      
Common stock issued for stock bonus (in shares)   12        
Balance at Sep. 30, 2012 $ 786,160 $ 482 $ 178,962 $ 598,533 $ 8,183  
Balance (in shares) at Sep. 30, 2012   48,327