REVENUES FROM CONTRACTS WITH CUSTOMERS - Schedule of Changes in Contract Assets and Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Contract Asset
Contract asset, Beginning of period	$ 7,430
Transferred to trade receivable of contract asset included in beginning of the year contract asset	(7,430)
Contract asset, net of transferred to trade receivables on contracts during the period	7,952
Contract asset, End of Period	7,952
Contract Liability
Contract liability, Beginning of Period	11,961
Recognition of revenue included in beginning of year contract liability	(2,838)
Contract liability, net of revenue recognized on contracts during the period	3,102
Foreign currency translation	(125)
Contract liability, End of Period	$ 12,100