Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured On A Recurring Basis) (Details)

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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Cash equivalents $ 379,076 $ 282,696
Level 1 [Member] | Recurring [Member]    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Cash equivalents $ 379,076 $ 282,696