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REVENUE RECOGNITION - Schedule of Assets and Liabilities Associated with Contracts from Customers (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Disaggregation Of Revenue [Line Items]    
Accounts receivable $ 66,952 $ 43,129
Short-term deferred revenue 82,472 80,782
Long-term deferred revenue 44,651 $ 41,785
Other Current Assets [Member]    
Disaggregation Of Revenue [Line Items]    
Short-term unbilled receivables 730  
Other Assets [Member]    
Disaggregation Of Revenue [Line Items]    
Long-term unbilled receivables $ 575