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, 2019
Dec. 31, 2018
Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 132,936 $ 86,046