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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Contract Assets and Deferred Revenue (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Contract assets $ 11,495 $ 15,296
Long-term contract assets 8,485 7,777
Total contract assets 19,980 23,073
Deferred revenue 229,103 232,865
Long-term deferred revenue 5,682 8,991
Total deferred revenue 234,785 $ 241,856
Revenue recognized during the period that was included in deferred revenue $ 212,000