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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 [Roll Forward]            
Net income 67,888     67,888    
Translation adjustment, net of tax (20,939)       (20,939)  
Pension adjustment, net of tax (457)       (457)  
Options exercised 9,720 $ 3 9,717      
Options exercised (in shares)   331        
Stock-based compensation expense 10,997   10,997      
Tax benefit of options exercised (318)   (318)      
Repurchase of common stock (47,144)         $ (47,144)
Repurchase of common stock (in shares)   (1,339)        
Retirement of common stock   $ (13)   (47,131)   47,144
Cash dividends declared on common stock, $0.81 per share (30,224)     (30,224)    
Shares issued from release of restricted stock units (3,716) $ 2 (3,718)      
Shares issued from release of restricted stock units (in shares)   210        
Common stock issued at $44.26 per share 552   552      
Common stock issued (in shares)   16        
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 [Roll Forward]            
Net income 89,734     89,734    
Translation adjustment, net of tax (3,920)       (3,920)  
Pension adjustment, net of tax (474)       (474)  
Options exercised 7,976 $ 3 7,973      
Options exercised (in shares)   270        
Stock-based compensation expense 13,186   13,186      
Tax benefit of options exercised 251   251      
Repurchase of common stock (53,502)         (53,502)
Repurchase of common stock (in shares)   (1,244)        
Retirement of common stock   $ (13)   (53,489)   53,502
Cash dividends declared on common stock, $0.81 per share (33,530)     (33,530)    
Shares issued from release of restricted stock units (4,018) $ 2 (4,020)      
Shares issued from release of restricted stock units (in shares)   217        
Common stock issued at $44.26 per share 315   315      
Common stock issued (in shares)   10        
Balance at Dec. 31, 2016 $ 865,842 $ 473 255,917 642,422 (32,970)  
Balance (in shares) at Dec. 31, 2016 47,437 47,437        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 92,617     92,617    
Translation adjustment, net of tax 21,418       21,418  
Pension adjustment, net of tax (944)       (944)  
Options exercised 6,610 $ 3 6,607      
Options exercised (in shares)   223        
Stock-based compensation expense 12,565   12,565      
Repurchase of common stock (70,000)   (10,000)     (60,000)
Repurchase of common stock (in shares)   (1,138)        
Retirement of common stock   $ (5)   (19,995)   20,000
Cash dividends declared on common stock, $0.81 per share (38,400)     (38,400)    
Shares issued from release of restricted stock units (5,341) $ 2 (5,343)      
Shares issued from release of restricted stock units (in shares)   214        
Common stock issued at $44.26 per share 411   411      
Common stock issued (in shares)   9        
Balance at Dec. 31, 2017 $ 884,778 $ 473 $ 260,157 $ 676,644 $ (12,496) $ (40,000)
Balance (in shares) at Dec. 31, 2017 46,745 46,745