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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, 2014 $ 863,465 $ 489 $ 220,982 $ 649,174 $ (7,180)  
Balance (in shares) at Dec. 31, 2014   48,966        
Increase (Decrease) in Stockholders' Equity            
Net income 10,051     10,051    
Translation adjustment, net of tax (16,328)       (16,328)  
Options exercised 5,484 $ 2 5,482      
Stock options exercised (in shares)   187        
Stock-based compensation 2,784   2,784      
Tax benefit of options exercised (184)   (184)      
Shares issued from release of Restricted Stock Units (3,607) $ 2 (3,609)      
Shares issued from release of Restricted Stock Units (in shares)   191        
Cash dividends declared on common stock, $0.14, $0.48, and $0.16 for the period ended March 31, 2015, December 31, 2015 and March 31, 2016, respectively (6,927)     (6,927)    
Common stock issued at $34.32 and $32.45 per share for stock bonus for the periods ended March 31, 2015 and December 31, 2015 and March 31, 2016, respectively 552   552      
Common stock issued (in shares)   16        
Balance at Mar. 31, 2015 855,290 $ 493 226,007 652,298 (23,508) $ 0
Balance (in shares) at Mar. 31, 2015   49,360        
Increase (Decrease) in Stockholders' Equity            
Net income 57,837     57,837    
Translation adjustment, net of tax (4,611)       (4,611)  
Pension adjustment, net of tax (457)       (457)  
Options exercised 4,236 $ 1 4,235      
Stock options exercised (in shares)   144        
Stock-based compensation 8,213   8,213      
Tax benefit of options exercised (134)   (134)      
Shares issued from release of Restricted Stock Units (109) $ 0 (109)      
Shares issued from release of Restricted Stock Units (in shares)   19        
Repurchase of common stock (47,144)         (47,144)
Repurchase of common stock (in shares)   (1,339)        
Retirement of common stock 0 $ (13)   (47,131)   47,144
Cash dividends declared on common stock, $0.14, $0.48, and $0.16 for the period ended March 31, 2015, December 31, 2015 and March 31, 2016, respectively (23,297)     (23,297)    
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      
Stock 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, $0.14, $0.48, and $0.16 for the period ended March 31, 2015, December 31, 2015 and March 31, 2016, respectively (7,729)     (7,729)    
Common stock issued at $34.32 and $32.45 per share for stock bonus for the periods ended March 31, 2015 and December 31, 2015 and March 31, 2016, respectively 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