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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $)
In Thousands, unless otherwise specified
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, 2011   $ 31 $ 50,883 $ 228,164 $ 7,747 $ (34,151) $ 71,676
Comprehensive income:              
Net income 20,254     15,497     4,757
Foreign currency translation adjustment 9,517       7,114   2,403
Net derivative instrument gain, net of tax 102       77   25
Shares issued upon exercise of stock options     247        
Sale of subsidiary shares to noncontrolling interests             145
Dividends       (2,444)      
Stock compensation     134 42     14
Ending Balance at Mar. 31, 2012 352,361 31 51,264 241,259 14,938 (34,151) 79,020
Beginning Balance at Dec. 31, 2012 499,981 31 54,679 349,672 12,498 (35,404) 118,505
Comprehensive income:              
Net income 42,942     31,696     11,246
Foreign currency translation adjustment (14,371)       (10,384)   (3,987)
Net derivative instrument gain, net of tax 9       4   5
Shares issued upon exercise of stock options     256        
Sale of subsidiary shares to noncontrolling interests               
Dividends       (3,686)      
Stock compensation     123 42     15
Ending Balance at Mar. 31, 2013 $ 525,311 $ 31 $ 55,058 $ 377,724 $ 2,118 $ (35,404) $ 125,784