Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Assets Measured on Recurring Basis) (Details)

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FAIR VALUE MEASUREMENTS (Assets Measured on Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Level 1 [Member] | Recurring [Member]    
Assets:    
Cash equivalents $ 204,401 $ 58,063