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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($)
$ in Thousands
Common stock [Member]
Additional paid-in capital
Retained earnings [Member]
Accumulated other comprehensive loss [Member]
Treasury stock [Member]
Noncontrolling interest[Member]
Total
Balance, beginning at Dec. 31, 2016 $ 31 $ 63,103 $ 402,714 $ (57,982) $ (37,475) $ 113,267  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued upon exercise of stock options   625          
Net income     20,117     7,261 $ 27,378
Dividends     (10,598)     (5,947)  
Share based compensation   468 347     254  
Purchase of subsidiary shares from noncontrolling interest        
Foreign currency translation adjustment, net of tax       24,106   9,466 33,572
Transfer from other comprehensive income into earnings       17   5  
Net derivative instrument gain (loss), net of tax       453   168  
Balance, ending at Jun. 30, 2017 31 64,196 412,580 (33,406) (37,475) 124,474 530,400
Balance, beginning at Dec. 31, 2017 31 66,004 422,570 (17,832) (37,475) 137,339 570,637
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued upon exercise of stock options   1,938          
Net income     26,808     9,313 36,121
Dividends     (13,146)     (8,706)  
Share based compensation   564 373     183  
Purchase of subsidiary shares from noncontrolling interest   (572)       (236) 808
Foreign currency translation adjustment, net of tax       (10,298)   (4,025) (14,323)
Transfer from other comprehensive income into earnings       21    
Net derivative instrument gain (loss), net of tax       (37)   (6)  
Balance, ending at Jun. 30, 2018 $ 31 $ 67,934 $ 436,605 $ (28,146) $ (37,475) $ 133,862 $ 572,811