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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Common stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Treasury stock [Member]
Noncontrolling interest [Member]
Balance at Dec. 31, 2012     $ 54,679 $ 349,672 $ 12,498 $ (35,404) $ 118,505
Net income $ 50,966     39,211     11,755
Foreign currency translation adjustment, net of tax         13,602   5,425
Transfer from OCI into earnings         (240)   (87)
Shares issued upon exercise of stock options 700   2,882     203  
Shares received as proceeds of option exercises           (815)  
Sale of subsidiary shares to noncontrolling interest     (173)       830
Dividends       (29,582)     (8,341)
Stock-based compensation     489 158     58
Balance at Dec. 31, 2013 535,356 $ 31 57,877 359,459 25,860 (36,016) 128,145
Net income 37,345     29,436     7,909
Foreign currency translation adjustment, net of tax         (41,683)   (16,123)
Transfer from OCI into earnings         0   0
Shares issued upon exercise of stock options 600   1,981     219  
Shares received as proceeds of option exercises           (667)  
Sale of subsidiary shares to noncontrolling interest     (335)       1,365
Dividends       (14,855)     (4,667)
Stock-based compensation     677 81     30
Balance at Dec. 31, 2014 498,724 31 60,200 374,121 (15,823) (36,464) 116,659
Net income 38,969     30,437     8,532
Foreign currency translation adjustment, net of tax         (32,268)   (12,078)
Transfer from OCI into earnings         0   0
Shares issued upon exercise of stock options 500   1,234     140  
Shares received as proceeds of option exercises           (493)  
Sale of subsidiary shares to noncontrolling interest     (192)       1,523
Dividends       (16,124)     (3,836)
Stock-based compensation     788 0     0
Balance at Dec. 31, 2015 $ 476,387 $ 31 $ 62,030 $ 388,434 $ (48,091) $ (36,817) $ 110,800