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REVENUE RECOGNITION - Summary of Contract Assets and Contract Liabilities from Contracts with Customers (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Receivables $ 281,154 $ 182,165
Short-term contract assets (Prepaid expenses and other assets) 21,135 17,879
Long-term contract assets (Other assets) 63,752 51,986
Short-term contract liabilities (Deferred revenues) 55,084 47,665
Long-term contract liabilities (Deferred revenues) $ 165,645 $ 125,473