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REVENUES (Contract Balances) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Change in Contract with Customer, Liability [Abstract]          
Revenue recognized $ 439 $ 140 $ 8,301 $ 3,801  
Revenues from performance obligations satisfied in previous period 9,105 $ 4,915 4,719 $ 7,039  
Trade receivables and contract assets          
Change in Contract with Customer, Liability [Abstract]          
Contract assets 21,548   21,548   $ 14,320
Accrued expenses and other current liabilities          
Change in Contract with Customer, Liability [Abstract]          
Contract liabilties $ 12,415   $ 12,415   $ 9,132