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REVENUE - Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Contract Liabilities    
Beginning balance $ 145,493 $ 162,068
Revenue recognized, included in beginning balance (39,531) (80,055)
Additions, net of revenue recognized during period, and other 59,379 93,308
Ending balance $ 165,341 $ 175,321