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Consolidated Statements of Changes in Shareholders' Equity (USD $)
In Thousands, except Share data
Total
Common stock
Additional paid-in capital
Retained earnings
Accumulated other comprehensive income
Treasury stock
Noncontrolling interest
Beginning Balance at Dec. 31, 2008 $ 255,509 $ 30 $ 41,950 $ 168,025 $ 25,515 $ (31,319) $ 51,308
Beginning Balance (in shares) at Dec. 31, 2008   30,168,939       9,966,379  
Net income 30,158     22,367     7,791
Foreign currency translation adjustments 8,767       6,789   1,978
Reclassification from OCI into earnings, net (5,922)       (4,423)   (1,499)
Net derivative instrument gain, net of tax 173       141   32
Dividends (5,690)     (3,974)     (1,716)
Shares issued upon exercise of stock options and warrants including income tax benefit of $110 for 2011, $520 for 2010 and $692 for 2009, respectively (in shares)   243,600       (150,000)  
Shares issued upon exercise of stock options and warrants including income tax benefit of $110 for 2011, $520 for 2010 and $692 for 2009, respectively 3,187   2,711     476  
Stock compensation 805   510 193     102
Sale of subsidiary shares to noncontrolling interest 2,626   (45)       2,671
Purchased treasury shares (in shares)   (108,100)       108,100  
Purchased treasury shares (631)         (631)  
Shares received as proceeds of option exercises (in shares)   (132,487)       132,487  
Shares received as proceeds of option exercises (1,569)         (1,569)  
Ending Balance at Dec. 31, 2009 287,413 30 45,126 186,611 28,022 (33,043) 60,667
Ending Balance (in shares) at Dec. 31, 2009   30,171,952       10,056,966  
Net income 35,675     26,593     9,082
Foreign currency translation adjustments (17,784)       (13,348)   (4,436)
Net derivative instrument gain, net of tax 157       83   74
Dividends (9,949)     (7,901)     (2,048)
Shares issued upon exercise of stock options and warrants including income tax benefit of $110 for 2011, $520 for 2010 and $692 for 2009, respectively (in shares)   376,455       (150,000)  
Shares issued upon exercise of stock options and warrants including income tax benefit of $110 for 2011, $520 for 2010 and $692 for 2009, respectively 4,505   4,012     493  
Stock compensation 799   597 150     52
Purchase of subsidiary shares from noncontrolling interest (4,595)   (2,087)       (2,508)
Sale of subsidiary shares to noncontrolling interest 5,326   1,239       4,087
Shares received as proceeds of option exercises (in shares)   (102,526)       102,526  
Shares received as proceeds of option exercises (1,601)         (1,601)  
Ending Balance at Dec. 31, 2010 299,946 30 48,887 205,453 14,757 (34,151) 64,970
Ending Balance (in shares) at Dec. 31, 2010   30,445,881       10,009,492  
Net income 42,949     32,303     10,646
Foreign currency translation adjustments (9,680)       (7,021)   (2,659)
Net derivative instrument gain, net of tax 18       11   7
Dividends (12,917)     (9,768)     (3,149)
Shares issued upon exercise of stock options and warrants including income tax benefit of $110 for 2011, $520 for 2010 and $692 for 2009, respectively (in shares)   95,625          
Shares issued upon exercise of stock options and warrants including income tax benefit of $110 for 2011, $520 for 2010 and $692 for 2009, respectively 1,093 1 1,092        
Stock compensation 935   695 176     64
Purchase of subsidiary shares from noncontrolling interest (750)   (417)       (333)
Sale of subsidiary shares to noncontrolling interest 2,756   626       2,130
Ending Balance at Dec. 31, 2011 $ 324,350 $ 31 $ 50,883 $ 228,164 $ 7,747 $ (34,151) $ 71,676
Ending Balance (in shares) at Dec. 31, 2011   30,541,506       10,009,492