ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Movement of accumulated other comprehensive income [Roll Forward]      
Beginning balance $ 11,387    
Reclassification of foreign currency translation adjustment into earnings due to disposal of VMF Shanghai       (1,468)
Ending balance 10,189 11,387  
Accumulated Other Comprehensive Income [Member]      
Movement of accumulated other comprehensive income [Roll Forward]      
Beginning balance 11,387 11,394 12,850
Foreign currency translation adjustment 69 (7) 12
Reclassification of unrealized gain on marketable equity securities into earnings       (1,468)
Deferred income received from disposal of a subsidiary (1,267)      
Ending balance $ 10,189 $ 11,387 $ 11,394