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OTHER COMPREHENSIVE INCOME (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Company
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
OTHER COMPREHENSIVE INCOME [Abstract]      
Other comprehensive (loss) income related to investment valuation $ 0 $ (100) $ (600)
Number of companies acquired | Company 4    
Cumulative translation adjustment $ (4,916) (3,277) (3,040)
Income tax benefits on cumulative translation adjustments $ 2,600 $ 1,700 $ 1,600