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Consolidated Statements of Changes in Shareholder's Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Treasury Stock [Member]
Noncontrolling Interest [Member]
Total
Beginning Balance at Dec. 31, 2019 $ 31 $ 70,664 $ 474,637 $ (39,853) $ (37,475) $ 140,994 $ 608,998
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   0          
Shares issued for license acquisition            
Transfer of subsidiary shares purchased   562       (139)  
Net income     38,219   11,749 49,968
Dividends     (10,406)     (324)  
Foreign currency translation adjustment, net of tax       33,908   14,004  
Transfer from other comprehensive income into earnings       52      
Transfer from other comprehensive income into earnings       (52)      
Net derivative instrument loss, net of tax         (19)  
Ending Balance at Dec. 31, 2020 32 75,708 503,567 (5,997) (37,475) 166,615 702,450
Shares issued upon exercise of stock options 0 5,393          
Share-based compensation   1,566 1,375     (293)  
Purchase of subsidiary shares from noncontrolling interests   0          
Shares issued for license acquisition   5,000          
Transfer of subsidiary shares purchased   (535)       (791)  
Net income     87,411   22,616 110,027
Dividends     (31,690)     (9,836)  
Foreign currency translation adjustment, net of tax       (31,443)   (11,524)  
Transfer from other comprehensive income into earnings            
Transfer from other comprehensive income into earnings            
Net derivative instrument loss, net of tax       (992)   (375)  
Ending Balance at Dec. 31, 2021 32 87,132 560,663 (38,432) (37,475) 166,412 738,332
Shares issued upon exercise of stock options 6,004          
Share-based compensation   1,355 2,237     (282)  
Purchase of subsidiary shares from noncontrolling interests   0          
Shares issued for license acquisition            
Transfer of subsidiary shares purchased   (4,305)       (98)  
Net income     120,938   30,099 151,037
Dividends     (63,743)     (16,056)  
Foreign currency translation adjustment, net of tax       (20,325)   (9,358)  
Transfer from other comprehensive income into earnings       992      
Transfer from other comprehensive income into earnings       (992)      
Net derivative instrument loss, net of tax       1,709   647  
Ending Balance at Dec. 31, 2022 $ 32 $ 90,186 $ 620,095 $ (56,056) $ (37,475) $ 171,364 $ 788,146