REVENUE FROM CONTRACTS WITH CUSTOMERS, CONTRACT ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance	$ 77,363
Revenue recognized in the current period from the amounts in the beginning balance	(70,339)
New deferrals, net of amounts recognized in the current period	87,225
Effects of foreign currency	(231)
Ending balance	94,018
Current liability	92,631	$ 74,851
Noncurrent liability	1,000
Net deferred liabilty	$ 1,000