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Interim Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
AdditionalPaid-in Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Loss
Balance (shares) at Dec. 31, 2017   11,534        
Balance at Dec. 31, 2017 $ 449,108 $ 1,158 $ 103,864 $ (426) $ 374,678 $ (30,166)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 14,583       14,583  
Translation adjustment 3,117         3,117
Net actuarial gain arising during period, net of taxes 126         126
Stock-based compensation 458   458      
Exercise of stock options (shares)   9        
Exercise of stock options 266   266      
Dividends paid ($0.12 per share) (1,276)       (1,276)  
Balance (shares) at Mar. 31, 2018   11,543        
Balance at Mar. 31, 2018 466,382 $ 1,158 104,588 (426) 387,985 (26,923)
Balance (shares) at Dec. 31, 2018   11,620        
Balance at Dec. 31, 2018 507,371 $ 1,166 108,422 (426) 443,040 (44,831)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 15,253       15,253  
Translation adjustment 720         720
Net actuarial gain arising during period, net of taxes 170         170
Stock-based compensation 627   627      
Common stock repurchase (in shares)   (15)        
Common stock repurchase (1,490)     (1,490)    
Exercise of stock options (shares)   11        
Exercise of stock options 237 $ 1 236      
Dividends paid ($0.12 per share) (1,404)       (1,404)  
Balance (shares) at Mar. 31, 2019   11,616        
Balance at Mar. 31, 2019 $ 521,484 $ 1,167 $ 109,285 $ (1,916) $ 456,889 $ (43,941)