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BASIS OF PRESENTATION, LIQUIDITY (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Cash and cash equivalents $ 79,749 $ 83,922 $ 77,050 $ 77,824
Working capital 78,500      
Subsidiaries | China        
Cash and cash equivalents 7,900 $ 13,500    
Accumulated profit determined in accordance with accounting standards of a particular country that can be paid as dividends $ 0