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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)
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 7,226       7,226
Stock options exercised 1,758 1 1,757    
Stock options exercised (in shares)   74      
Stock-based compensation 3,110   3,110    
Tax effect of options exercised (2)   (2)    
Shares issued from release of Restricted Stock Units (935)   (935)    
Shares issued from release of Restricted Stock Units (in shares)   61      
Cash dividends declared on common stock, $0.50 and $0.125 per share for the period ended December 31, 2012 and March 31, 2012, respectively (6,038)     (6,038)  
Common stock issued at $33.83 and $33.71 per share for stock bonus for the period ended March 31, 2013 and March 31, 2012, 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      
Increase (Decrease) in Stockholders' Equity          
Net income 34,717     34,717  
Translation adjustment, net of tax (1,667)       (1,667)
Pension adjustment, net of tax (243)       (243)
Stock options exercised 3,167 1 3,166    
Stock options exercised (in shares)   111      
Stock-based compensation 7,085   7,085    
Tax effect of options exercised (231)   (231)    
Shares issued from release of Restricted Stock Units (174)   (174)    
Shares issued from release of Restricted Stock Units (in shares)   1      
Cash dividends declared on common stock, $0.50 and $0.125 per share for the period ended December 31, 2012 and March 31, 2012, respectively (24,187)     (24,187)  
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 4,795     4,795  
Translation adjustment, net of tax (5,817)       (5,817)
Stock options exercised 496 1 495    
Stock options exercised (in shares)   18      
Stock-based compensation 2,813   2,813    
Tax effect of options exercised (1,843)   (1,843)    
Shares issued from release of Restricted Stock Units (1,906) 1 (1,907)    
Shares issued from release of Restricted Stock Units (in shares)   108      
Common stock issued at $33.83 and $33.71 per share for stock bonus for the period ended March 31, 2013 and March 31, 2012, respectively 315   315    
Common stock issued (in shares)   9      
Balance at Mar. 31, 2013 $ 788,421 $ 485 $ 184,550 $ 597,104 $ 6,282
Balance (in shares) at Mar. 31, 2013   48,557