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Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
$ in Thousands
Common stock
Additional paid in-capital
Retained earnings
Accumulate other comprehensive loss
Treasury stock
Noncontrolling interest 
Total
Balance, beginning at Dec. 31, 2017 $ 31 $ 66,004 $ 422,570 $ (17,832) $ (37,475) $ 137,339
Shares issued upon exercise of stock options 2,384          
Share based compensation 849 495     262  
Purchase of subsidiary shares from noncontrolling interest (572)       (236)  
Net income   45,746   14,801 60,547
Dividends     (19,726)     (8,706)  
Foreign currency translation adjustment, net of tax     (12,558)   (4,729) (17,287)
Transfer from other comprehensive income into earnings     4      
Net derivative instrument (loss), net of tax     (37)   (12)  
Balance, ending at Sep. 30, 2018 31 68,665 449,085 (30,423) (37,475) 138,719 588,602
Balance, beginning at Dec. 31, 2018 31 69,970 448,731 (33,650) (37,475) 138,139 585,746
Shares issued upon exercise of stock options 2,781          
Share based compensation 1,052 1,637     190  
Purchase of subsidiary shares from noncontrolling interest (5,167)       (920)  
Net income   52,059   15,176 67,235
Dividends   (25,950)     (9,654)  
Foreign currency translation adjustment, net of tax     (16,569)   (6,702) (23,271)
Transfer from other comprehensive income into earnings     (136)      
Net derivative instrument (loss), net of tax     (53)   (70)  
Balance, ending at Sep. 30, 2019 $ 31 $ 68,636 $ 476,477 $ (50,408) $ (37,475) $ 136,159 $ 593,420