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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Common stock
Additional paid-in capital
Retained earnings
Accumulated other comprehensive loss
Treasury stock
Noncontrolling interest
Total
Beginning Balance at Dec. 31, 2017 $ 31 $ 66,004 $ 422,570 $ (17,832)   $ 137,339  
Foreign currency translation adjustment, net of tax       (15,917)   (6,638)  
Transfer from other comprehensive income into earnings       (37)      
Net derivative instrument gain (loss), net of tax       136   39 $ 39
Net income     53,793     15,922 69,715
Dividends     (28,356)     (8,706)  
Shares issued upon exercise of stock options 3,406          
Share-based compensation   1,132 724     419  
Purchase of subsidiary shares from noncontrolling interests   (572)       (236)  
Transfer of subsidiary shares purchased          
Ending Balance at Dec. 31, 2018 31 69,970 448,731 (33,650) $ (37,475) 138,139 585,746
Foreign currency translation adjustment, net of tax       (6,119)   (2,593)  
Transfer from other comprehensive income into earnings       (136)      
Net derivative instrument gain (loss), net of tax       52   (30) (30)
Net income     60,249     15,821 76,070
Dividends     (36,349)     (9,654)  
Shares issued upon exercise of stock options 4,458          
Share-based compensation   1,403 2,006     231  
Purchase of subsidiary shares from noncontrolling interests   (5,167)       (920)  
Transfer of subsidiary shares purchased          
Ending Balance at Dec. 31, 2019 31 70,664 474,637 (39,853) (37,475) 140,994 608,998
Foreign currency translation adjustment, net of tax       33,908   14,004  
Transfer from other comprehensive income into earnings       (52)      
Net derivative instrument gain (loss), net of tax         (19) (19)
Net income     38,219     11,749 49,968
Dividends     (10,406)     (324)  
Shares issued upon exercise of stock options 1 2,771          
Share-based compensation   1,711 1,117     350  
Purchase of subsidiary shares from noncontrolling interests          
Transfer of subsidiary shares purchased   562       (139)  
Ending Balance at Dec. 31, 2020 $ 32 $ 75,708 $ 503,567 $ (5,997) $ (37,475) $ 166,615 $ 702,450