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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
CASH AND CASH EQUIVALENTS    
Short-term investments $ 103,562 $ 71,754
Reserve requirement, included in cash and equivalents 6,400 2,900
Short-term investments pledged as collateral    
CASH AND CASH EQUIVALENTS    
Short-term investments $ 16,100 $ 9,900