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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (loss) [Member]
Treasury Stock [Member]
Noncontrolling Interest [Member]
Total
Balance, beginning at Dec. 31, 2014 $ 31 $ 60,200 $ 374,121 $ (15,823) $ (36,464) $ 116,659  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued upon exercise of stock options   1,234     140    
Shares received as proceeds of option exercises         (493)    
Sale of subsidiary shares to noncontrolling interest   (192)       1,523  
Net income     30,437     8,532 $ 38,969
Dividends     (16,124)     (3,836)  
Stock-based compensation   788      
Purchase of subsidiary shares from noncontrolling interest          
Foreign currency translation adjustment, net of tax       (32,268)   (12,078) (44,346)
Transfer from other comprehensive income into earnings          
Net derivative instrument gain, net of tax          
Balance, ending at Dec. 31, 2015 31 62,030 388,434 (48,091) (36,817) 110,800 476,387
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued upon exercise of stock options   2,160     142    
Shares received as proceeds of option exercises         (800)    
Sale of subsidiary shares to noncontrolling interest   (173)       1,738  
Net income     33,331     9,917 43,248
Dividends     (19,273)     (4,863)  
Stock-based compensation   839 222     147  
Purchase of subsidiary shares from noncontrolling interest   (1,753)       (1,188)  
Foreign currency translation adjustment, net of tax       (9,874)   (3,279) (13,153)
Transfer from other comprehensive income into earnings          
Net derivative instrument gain, net of tax       (17)   (5)  
Balance, ending at Dec. 31, 2016 31 63,103 402,714 (57,982) (37,475) 113,267 483,658
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued upon exercise of stock options   1,963        
Shares received as proceeds of option exercises            
Sale of subsidiary shares to noncontrolling interest          
Net income     41,594     13,659 55,253
Dividends     (22,460)     (6,039)  
Stock-based compensation   938 722     531  
Purchase of subsidiary shares from noncontrolling interest          
Foreign currency translation adjustment, net of tax       40,096   15,899 55,995
Transfer from other comprehensive income into earnings       17   5  
Net derivative instrument gain, net of tax       37   17  
Balance, ending at Dec. 31, 2017 $ 31 $ 66,004 $ 422,570 $ (17,832) $ (37,475) $ 137,339 $ 570,637