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REVENUE - Contract Balances (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
REVENUE      
Contract assets $ 29,569 $ 29,569 $ 28,529
Contract liabilities 4,546 4,546 $ 4,935
Revenue recognized, included in contract liability balance $ 2,400 $ 4,600