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REVENUE RECOGNITION - Summary of Significant Changes in the Balances of Contract Liabilities and Assets (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Contract Assets  
Balance, beginning of period $ 69,865
Amount recognized (15,957)
Increase 35,933
Balance, end of period 89,841
Contract Liabilities  
Balance, beginning of period 173,138
Revenue recognized (48,704)
Increase due to billings 112,047
Balance, end of period $ 236,481