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REVENUE - Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Contract Liabilities    
Beginning balance $ 162,068 $ 148,720
Revenue recognized, included in beginning balance (80,055) (68,927)
Additions, net of revenue recognized during period, and other 93,308 75,321
Ending balance $ 175,321 $ 155,114