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PREPAID EXPENSES AND OTHER LONG-TERM ASSETS (Schedule of Other Long-Term Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Other Assets, Noncurrent Disclosure [Abstract]    
Deferred commission costs $ 94,087 $ 79,336
Severance pay fund 13,511 13,201
Prepaid expenses 39,875 27,912
Other 6,187 3,585
Prepaid Expense and Other Assets, Noncurrent $ 153,660 $ 124,034