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REVENUE RECOGNITION - Summary of Contract Assets and Contract Liabilities from Contracts with Customers (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Receivables $ 273,012 $ 182,165
Short-term contract assets (Prepaid expenses and other assets) 22,461 17,879
Long-term contract assets (Other assets) 67,380 51,986
Short-term contract liabilities (Deferred revenues, current) 59,232 47,665
Long-term contract liabilities (Deferred revenues, non-current) $ 177,249 $ 125,473