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REVENUE - Contract Balances (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
REVENUE      
Contract assets $ 28,324 $ 28,324 $ 28,529
Contract liabilities 3,188 3,188 $ 4,935
Revenue recognized, included in contract liability balance $ 2,000 $ 4,500