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SIGNIFICANT ACCOUNTING POLICIES (Performance Obligations) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Accounting Policies [Abstract]  
Deferred revenue recognized $ 215,737
Revenue remaining performance obligation $ 1,348,100
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation expected timing of satisfaction period 24 months