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REVENUE RECOGNITION - Schedule of Assets and Liabilities Associated with Contracts from Customers (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Disaggregation Of Revenue [Line Items]    
Accounts receivable $ 68,498 $ 60,452
Short-term deferred revenue 120,150 97,333
Long-term deferred revenue 51,317 $ 47,529
Other Current Assets [Member]    
Disaggregation Of Revenue [Line Items]    
Short-term unbilled receivables 6,566  
Other Assets [Member]    
Disaggregation Of Revenue [Line Items]    
Long-term unbilled receivables $ 4,362