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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, 2017 $ 884,778 $ 473 $ 260,157 $ 676,644 $ (12,496) $ (40,000)
Balance (in shares) at Dec. 31, 2017   46,745        
Increase (Decrease) in Stockholders' Equity            
Net income 25,429     25,429    
Translation adjustment, net of tax 3,860       3,860  
Options exercised 695 $ 0 695      
Options exercised (in shares)   23        
Stock-based compensation 2,716   2,716      
Shares issued from release of Restricted Stock Units (5,027) $ 2 (5,029)      
Shares issued from release of Restricted Stock Units (in shares)   163        
Repurchase of common stock (24,999)   10,000     (34,999)
Repurchase of common stock (in shares)   (620)        
Cash dividends declared on common stock (9,647)     (9,647)    
Common stock issued 465   465      
Common stock issued (in shares)   8        
Balance at Mar. 31, 2018 879,062 $ 475 269,004 693,218 (8,636) (74,999)
Balance (in shares) at Mar. 31, 2018   46,319        
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        
Increase (Decrease) in Stockholders' Equity            
Net income 101,204     101,204    
Translation adjustment, net of tax (16,771)       (16,771)  
Pension adjustment, net of tax 376       376  
Stock-based compensation 7,618   7,618      
Adoption of new accounting standards (1)     (382) 381  
Shares issued from release of Restricted Stock Units (118) $ 0 (118)      
Shares issued from release of Restricted Stock Units (in shares)   14        
Repurchase of common stock (85,541)   0     (85,541)
Repurchase of common stock (in shares)   (1,335)        
Retirement of common stock 0 $ (22)   (135,518)   135,540
Cash dividends declared on common stock (30,315)     (30,315)    
Balance at Dec. 31, 2018 855,514 $ 453 276,504 628,207 (24,650) (25,000)
Balance (in shares) at Dec. 31, 2018   44,998        
Increase (Decrease) in Stockholders' Equity            
Net income 22,662     22,662    
Translation adjustment, net of tax (1,335)       (1,335)  
Stock-based compensation 3,903   3,903      
Shares issued from release of Restricted Stock Units (5,861) $ 2 (5,863)      
Shares issued from release of Restricted Stock Units (in shares)   164        
Repurchase of common stock (30,000)   0     (30,000)
Repurchase of common stock (in shares)   (505)        
Cash dividends declared on common stock (9,701)     (9,701)    
Common stock issued 292   292      
Common stock issued (in shares)   5        
Balance at Mar. 31, 2019 $ 835,474 $ 455 $ 274,836 $ 641,168 $ (25,985) $ (55,000)
Balance (in shares) at Mar. 31, 2019   44,662