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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance at Dec. 31, 2015 $ 849,824 $ 481 $ 238,212 $ 639,707 $ (28,576)  
Balance (in shares) at Dec. 31, 2015   48,184        
Increase (Decrease) in Stockholders' Equity            
Net income 16,343     16,343    
Translation adjustment, net of tax 9,489       9,489  
Options exercised 1,013 $ 1 1,012      
Options exercised (in shares)   35        
Stock-based compensation 2,350   2,350      
Tax benefit of options exercised 24   24      
Shares issued from release of Restricted Stock Units (3,871) $ 2 (3,873)      
Shares issued from release of Restricted Stock Units (in shares)   196        
Repurchase of common stock (3,502)   0     $ (3,502)
Repurchase of common stock (in shares)   (106)        
Cash dividends declared on common stock, $0.16, $0.54 and $0.18 for the period ended March 31, 2016, December 31, 2016 and March 31, 2017, respectively (7,729)     (7,729)    
Common stock issued at $32.45 per share for stock bonus for the periods ended March 31, 2016 and December 31, 2016 and $44.26 for the period ended March 31, 2017, 315   315      
Common stock issued (in shares)   10        
Balance at Mar. 31, 2016 864,256 $ 484 238,040 648,321 (19,087) (3,502)
Balance (in shares) at Mar. 31, 2016   48,319        
Balance at Dec. 31, 2015 849,824 $ 481 238,212 639,707 (28,576)  
Balance (in shares) at Dec. 31, 2015   48,184        
Increase (Decrease) in Stockholders' Equity            
Net income 73,391     73,391    
Translation adjustment, net of tax (13,409)       (13,409)  
Pension adjustment, net of tax (474)       (474)  
Options exercised 6,963 $ 2 6,961      
Options exercised (in shares)   235        
Stock-based compensation 10,836   10,836      
Tax benefit of options exercised 227   227      
Shares issued from release of Restricted Stock Units (147) $ 0 (147)      
Shares issued from release of Restricted Stock Units (in shares)   21        
Repurchase of common stock (50,000)   0     (50,000)
Repurchase of common stock (in shares)   (1,138)        
Retirement of common stock 0 $ (13)   (53,489)   53,502
Cash dividends declared on common stock, $0.16, $0.54 and $0.18 for the period ended March 31, 2016, December 31, 2016 and March 31, 2017, respectively (25,801)     (25,801)    
Balance at Dec. 31, 2016 865,842 $ 473 255,917 642,422 (32,970)  
Balance (in shares) at Dec. 31, 2016   47,437        
Increase (Decrease) in Stockholders' Equity            
Net income 23,121     23,121    
Translation adjustment, net of tax 3,322       3,322  
Options exercised 314 $ 0 314      
Options exercised (in shares)   11        
Stock-based compensation 7,650   7,650      
Tax benefit of options exercised 1,104          
Shares issued from release of Restricted Stock Units (5,124) $ 2 (5,126)      
Shares issued from release of Restricted Stock Units (in shares)   197        
Cash dividends declared on common stock, $0.16, $0.54 and $0.18 for the period ended March 31, 2016, December 31, 2016 and March 31, 2017, respectively (8,584)     (8,584)    
Common stock issued at $32.45 per share for stock bonus for the periods ended March 31, 2016 and December 31, 2016 and $44.26 for the period ended March 31, 2017, 412   412      
Common stock issued (in shares)   9        
Balance at Mar. 31, 2017 $ 886,953 $ 475 $ 259,167 $ 656,959 $ (29,648) $ 0
Balance (in shares) at Mar. 31, 2017   47,654