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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, 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, net of tax 1,400       1,400  
Stock options exercised 2,184 1 2,183      
Stock options exercised (in shares)   90        
Stock-based 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, $0.25, $0.25 and $0.375 per share for the period ended September 30, 2013, December 31, 2012 and September 30, 2012, respectively (18,119)     (18,119)    
Common stock issued at $33.81 and $33.71 per share for stock bonus for the period ended September 30, 2013 and September 30, 2012, respectively 418   418      
Common stock issued (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        
Increase (Decrease) in Stockholders' Equity            
Net income 5,882     5,882    
Translation adjustment, net of tax 4,159       4,159  
Pension adjustment, net of tax (243)       (243)  
Stock options exercised 2,741 1 2,740      
Stock options exercised (in shares)   95        
Stock-based compensation 3,147   3,147      
Tax effect of options exercised (173)   (173)      
Shares issued from release of Restricted Stock Units 1   1      
Cash dividends declared on common stock, $0.25, $0.25 and $0.375 per share for the period ended September 30, 2013, December 31, 2012 and September 30, 2012, respectively (12,106)     (12,106)    
Balance at Dec. 31, 2012 789,568 483 184,677 592,309 12,099  
Balance (in shares) at Dec. 31, 2012   48,422        
Increase (Decrease) in Stockholders' Equity            
Net income 43,303     43,303    
Translation adjustment, net of tax 1,449       1,449  
Stock options exercised 5,333 2 5,331      
Stock options exercised (in shares)   194        
Stock-based compensation 8,656   8,656      
Tax effect of options exercised (2,187)   (2,187)      
Shares issued from release of Restricted Stock Units (2,072) 2 (2,074)      
Shares issued from release of Restricted Stock Units (in shares)   111        
Repurchase of common stock (9,825)         (9,825)
Repurchase of common stock (in shares)   (342)        
Cash dividends declared on common stock, $0.25, $0.25 and $0.375 per share for the period ended September 30, 2013, December 31, 2012 and September 30, 2012, respectively (12,083)     (12,083)    
Common stock issued at $33.81 and $33.71 per share for stock bonus for the period ended September 30, 2013 and September 30, 2012, respectively 318   318      
Common stock issued (in shares)   9        
Balance at Sep. 30, 2013 $ 822,460 $ 487 $ 194,721 $ 623,529 $ 13,548 $ (9,825)
Balance (in shares) at Sep. 30, 2013   48,394