XML 195 R50.htm IDEA: XBRL DOCUMENT v3.21.1
SHORT-TERM AND LONG-TERM INVESTMENTS (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Marketable securities $ 1,012,282 $ 735,717
Short-term bank deposits $ 9,331 $ 17,444