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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($)
$ in Thousands
Common stock
Additional paid-in capital
Retained earnings
Accumulated other comprehensive loss
Treasury stock
Noncontrolling interest
Total
Balance, beginning at Dec. 31, 2017 $ 31 $ 66,004 $ 422,570 $ (17,832)   $ 137,339  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued upon exercise of stock options   1,938          
Net income     26,808     9,313 $ 36,121
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)  
Share-based compensation   564 373     183  
Purchase of subsidiary shares from noncontrolling interest   572       236  
Dividends     (13,146)     (8,706)  
Balance, ending at Jun. 30, 2018 31 67,934 436,605 (28,146) $ (37,475) 133,862 572,811
Balance, beginning at Dec. 31, 2018 31 69,970 448,731 (33,650)   138,139 585,746
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued upon exercise of stock options   2,281          
Net income     31,211     9,366 40,577
Foreign currency translation adjustment, net of tax       (2,229)   (765) (2,994)
Transfer from other comprehensive income into earnings       (136)      
Net derivative instrument gain (loss), net of tax       (244)   39  
Share-based compensation   701 1,218     135  
Purchase of subsidiary shares from noncontrolling interest   (4,610)       (1,477)  
Dividends     (17,298)     9,654  
Balance, ending at Jun. 30, 2019 $ 31 $ 68,342 $ 463,862 $ (35,771) $ (37,475) $ 135,783 $ 594,772