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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
CASH AND CASH EQUIVALENTS    
Short-term investments $ 579,829 $ 183,189
Reserve requirement, included in cash and equivalents 18,300 18,000
Short-term investments pledged as collateral    
CASH AND CASH EQUIVALENTS    
Short-term investments $ 96,300 $ 25,400