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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 47,463     35,511     11,952
Shares issued upon exercise of stock options     1,198         
Shares received as proceeds of option exercises               
Foreign currency translation adjustment (4,979)       (3,881)   (1,098)
Net derivative instrument loss, net of tax         (240)   (87)
Sale of subsidiary shares to noncontrolling interests                
Dividends       (7,378)     (8,341)
Stock-based compensation     245 82     30
Ending Balance at Jun. 30, 2013 527,974 31 56,122 377,887 8,377 (35,404) 120,961
Beginning Balance at Dec. 31, 2013 535,356 31 57,877 359,459 25,860 (36,016) 128,145
Net income 19,817     15,003     4,814
Shares issued upon exercise of stock options     1,014     101  
Shares received as proceeds of option exercises           (351)  
Foreign currency translation adjustment (3,120)       (3,120)   (1,510)
Net derivative instrument loss, net of tax                
Sale of subsidiary shares to noncontrolling interests     (319)       1,309
Dividends       (7,424)     (4,667)
Stock-based compensation     335 55     21
Ending Balance at Jun. 30, 2014 $ 540,617 $ 31 $ 58,907 $ 367,093 $ 22,740 $ (36,266) $ 128,112