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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Contract Assets and Deferred Revenue (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Contract assets $ 15,296 $ 5,558
Long-term contract assets 7,777 5,420
Total contract assets 23,073 10,978
Deferred revenue 232,865 190,080
Long-term deferred revenue 8,991 5,407
Total deferred revenue $ 241,856 $ 195,487