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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 7,078     7,078    
Translation adjustment, net of tax of $23, $0 and ($1) for the periods ended March 31, 2012, December 31, 2011 and March 31, 2011, respectively 6,857       6,857  
Stock options exercised 154   154      
Stock options exercised (in shares)   6        
Stock compensation 1,281   1,281      
Tax effect of options exercised (39)   (39)      
Cash dividends declared on common stock, $0.125, $0.375 and $0.125 per share for the periods ended March 31, 2012, December 31, 2011 and March 31, 2011, respectively (6,263)     (6,263)    
Common stock issued at $33.71 and $30.91 per share for stock bonus for the period ended March 31, 2012 and March 31, 2011, respectively 204   204      
Common stock issued (in shares)   7        
Balance at Mar. 31, 2011 797,065 500 167,025 608,056 21,484  
Balance (in shares) at Mar. 31, 2011   50,109        
Increase (Decrease) in Stockholders' Equity            
Net income 43,822     43,822    
Translation adjustment, net of tax of $23, $0 and ($1) for the periods ended March 31, 2012, December 31, 2011 and March 31, 2011, respectively (14,701)       (14,701)  
Stock options exercised 60   60      
Stock options exercised (in shares)   2        
Stock compensation 4,913   4,913      
Tax effect of options exercised (1,515)   (1,515)      
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, $0.125, $0.375 and $0.125 per share for the periods ended March 31, 2012, December 31, 2011 and March 31, 2011, respectively (18,073)     (18,073)    
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 7,201     7,201    
Translation adjustment, net of tax of $23, $0 and ($1) for the periods ended March 31, 2012, December 31, 2011 and March 31, 2011, respectively 7,226       7,226  
Stock options exercised 1,758 1 1,757      
Stock options exercised (in shares)   74        
Stock compensation 3,110   3,110      
Tax effect of options exercised (2)   (2)      
Shares issued from release of RSU (935)   (935)      
Shares issued from release of RSU (in shares)   61        
Cash dividends declared on common stock, $0.125, $0.375 and $0.125 per share for the periods ended March 31, 2012, December 31, 2011 and March 31, 2011, respectively (6,038)     (6,038)    
Common stock issued at $33.71 and $30.91 per share for stock bonus for the period ended March 31, 2012 and March 31, 2011, respectively 418   418      
Common stock issued (in shares)   12        
Balance at Mar. 31, 2012 $ 771,101 $ 482 $ 174,831 $ 581,779 $ 14,009  
Balance (in shares) at Mar. 31, 2012   48,310