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CASH, CASH EQUIVALENTS AND OTHER INVESTMENTS - NON CURRENT AND CURRENT (Other investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Cash, cash equivalents and other investments [Abstract]    
Investments in companies under cost method $ 252 $ 0
Investments in debt instruments 3,128 5,998
Other investments, net – Non-current $ 3,380 $ 5,998