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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 72,341     72,341    
Translation adjustment, net of tax 5,244       5,244  
Options exercised 6,695 $ 3 6,692      
Options exercised (in shares)   227        
Stock-based compensation 9,039   9,039      
Tax benefit of options exercised 140   140      
Shares issued from release of Restricted Stock Units (3,996) $ 2 (3,998)      
Shares issued from release of Restricted Stock Units (in shares)   216        
Repurchase of common stock (53,502)   (6,500)     $ (47,002)
Repurchase of common stock (in shares)   (1,090)        
Cash dividends declared on common stock (24,996)     (24,996)    
Common stock issued 315   315      
Common stock issued (in shares)   10        
Balance at Sep. 30, 2016 861,104 $ 486 243,900 687,052 (23,332) (47,002)
Balance (in shares) at Sep. 30, 2016   47,547        
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 17,393     17,393    
Translation adjustment, net of tax (9,164)       (9,164)  
Pension adjustment, net of tax (474)       (474)  
Options exercised 1,281 $ 0 1,281      
Options exercised (in shares)   43        
Stock-based compensation 4,147   4,147      
Tax benefit of options exercised 111   111      
Shares issued from release of Restricted Stock Units (22) $ 0 (22)      
Shares issued from release of Restricted Stock Units (in shares)   1        
Repurchase of common stock 0   6,500     (6,500)
Repurchase of common stock (in shares)   (154)        
Retirement of common stock 0 $ (13)   (53,489)   53,502
Cash dividends declared on common stock (8,534)     (8,534)    
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 79,532     79,532    
Translation adjustment, net of tax 19,492       19,492  
Options exercised 3,566 $ 1 3,565      
Options exercised (in shares)   120        
Stock-based compensation 10,764   10,764      
Tax benefit of options exercised 0          
Shares issued from release of Restricted Stock Units (5,166) $ 2 (5,168)      
Shares issued from release of Restricted Stock Units (in shares)   210        
Repurchase of common stock (20,000)   0     (20,000)
Repurchase of common stock (in shares)   (461)        
Cash dividends declared on common stock (38,400)     (38,400)    
Common stock issued 412   412      
Common stock issued (in shares)   9        
Balance at Sep. 30, 2017 $ 916,042 $ 476 $ 265,490 $ 683,554 $ (13,478) $ (20,000)
Balance (in shares) at Sep. 30, 2017   47,315