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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 26,571     26,571    
Translation adjustment, net of tax of $3, ($2) and $1 for the periods ended June 30, 2012, December 31, 2011 and June 30, 2011, respectively 10,252       10,252  
Stock options exercised 154   154      
Stock options exercised (in shares)   6        
Stock compensation 2,118   2,118      
Tax effect of options exercised (39)   (39)      
Repurchase of common stock (50,075)         (50,075)
Repurchase of common stock (in shares)   (1,828)        
Retirement of common stock   (18)   (50,057)   50,075
Cash dividends declared on common stock, $0.25, $0.25 and $0.25 per share for the periods ended June 30, 2012, December 31, 2011 and June 30, 2011, respectively (12,526)     (12,526)    
Common stock issued at $33.71 and $30.91 per share for stock bonus for the period ended June 30, 2012 and 2011, respectively 204   204      
Common stock issued at $33.71 and $30.91 per share for stock bonus for the period ended June 30, 2012 and 2011, respectively (in shares)   7        
Balance at Jun. 30, 2011 764,452 482 167,862 571,229 24,879  
Balance (in shares) at Jun. 30, 2011   48,281        
Increase (Decrease) in Stockholders' Equity            
Net income 24,329     24,329    
Translation adjustment, net of tax of $3, ($2) and $1 for the periods ended June 30, 2012, December 31, 2011 and June 30, 2011, respectively (18,096)       (18,096)  
Stock options exercised 60   60      
Stock options exercised (in shares)   2        
Stock compensation 4,076   4,076      
Tax effect of options exercised (1,515)   (1,515)      
Repurchase of common stock (3,133)         (3,133)
Repurchase of common stock (in shares)   (120)        
Retirement of common stock   (1)   (3,132)   3,133
Cash dividends declared on common stock, $0.25, $0.25 and $0.25 per share for the periods ended June 30, 2012, December 31, 2011 and June 30, 2011, respectively (11,810)     (11,810)    
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 23,060     23,060    
Translation adjustment, net of tax of $3, ($2) and $1 for the periods ended June 30, 2012, December 31, 2011 and June 30, 2011, respectively (2,725)       (2,725)  
Stock options exercised 1,983 1 1,982      
Stock options exercised (in shares)   82        
Stock compensation 5,005   5,005      
Tax effect of options exercised (56)   (56)      
Shares issued from release of Restricted Stock Units (1,023)   (1,023)      
Shares issued from release of Restricted Stock Units (in shares)   61        
Cash dividends declared on common stock, $0.25, $0.25 and $0.25 per share for the periods ended June 30, 2012, December 31, 2011 and June 30, 2011, respectively (12,081)     (12,081)    
Common stock issued at $33.71 and $30.91 per share for stock bonus for the period ended June 30, 2012 and 2011, respectively 418   418      
Common stock issued at $33.71 and $30.91 per share for stock bonus for the period ended June 30, 2012 and 2011, respectively (in shares)   12        
Balance at Jun. 30, 2012 $ 772,944 $ 482 $ 176,809 $ 591,595 $ 4,058  
Balance (in shares) at Jun. 30, 2012   48,318