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REVENUES (Contract Balances) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Change in Contract with Customer, Liability [Abstract]          
Revenue recognized $ 1,325 $ 610 $ 7,862 $ 3,661  
Revenues from performance obligations satisfied in previous period (3,669) $ 7,693 4,182 $ 4,119  
Trade receivables and contract assets          
Change in Contract with Customer, Liability [Abstract]          
Contract assets 12,353   12,353   $ 14,320
Accrued expenses and other current liabilities          
Change in Contract with Customer, Liability [Abstract]          
Contract liabilties $ 11,461   $ 11,461   $ 9,132