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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $)
In Thousands
Total
Common stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive income [Member]
Treasury stock [Member]
Noncontrolling interest [Member]
Beginning Balance at Dec. 31, 2012   $ 31 $ 54,679 $ 349,672 $ 12,498 $ (35,404) $ 118,505
Net income 42,942     31,696     11,246
Shares issued upon exercise of stock options     256         
Shares received as proceeds of option exercises               
Foreign currency translation adjustment (14,371)       (10,384)   (3,987)
Net derivative instrument gain, net of tax 9       4   5
Sale of subsidiary shares to noncontrolling interests                
Dividends       (3,686)      
Stock-based compensation     123 42     15
Ending Balance at Mar. 31, 2013 525,311 31 55,058 377,724 2,118 (35,404) 125,784
Beginning Balance at Dec. 31, 2013 535,356 31 57,877 359,459 25,860 (36,016) 128,145
Net income 12,150     8,894     3,256
Shares issued upon exercise of stock options     908     101  
Shares received as proceeds of option exercises           (351)  
Foreign currency translation adjustment (1,397)       (919)   (478)
Net derivative instrument gain, net of tax                 
Sale of subsidiary shares to noncontrolling interests     (319)       1,309
Dividends       (3,712)      
Stock-based compensation     168 29     10
Ending Balance at Mar. 31, 2014 $ 544,252 $ 31 $ 58,634 $ 364,670 $ 24,941 $ (36,266) $ 132,242