REVENUE FROM CONTRACTS WITH CUSTOMERS , CONTRACT ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance	$ 70,620
Revenue recognized in the current period from the amounts in the beginning balance	(52,125)
New deferrals, net of amounts recognized in the current period	65,628
Effects of foreign currency	(773)
Ending balance	83,350
Current liability	80,358	$ 67,274
Noncurrent liability	$ 3,000