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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
CASH AND CASH EQUIVALENTS    
Short-term investments $ 113,075 $ 103,562
Reserve requirement, included in cash and equivalents 17,000 6,400
Short-term investments pledged as collateral    
CASH AND CASH EQUIVALENTS    
Short-term investments $ 900 $ 16,100