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REVENUE (Significant Changes in Contract Liabilities) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
REVENUE [Abstract]  
Balance $ 2,602
Non-cancelable contracts with customers entered into during the period 2,458
Revenue recognized related to non-cancelable contracts with customers during the period (3,124)
Balance $ 1,936