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RESTRICTED CASH (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
RESTRICTED CASH        
Cash and cash equivalents $ 27,153 $ 37,440    
Restricted cash 10,000      
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 37,153 $ 37,440 $ 25,874 $ 12,380