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REVENUE RECOGNITION - Schedule of Customer Assets & Liabilities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Accounts receivable
Beginning balance	$ 168,502
Increase (decrease), net	(14,990)
Ending balance	153,512
Unbilled accounts receivable
Beginning balance	24,204
Increase (decrease), net	30,097
Ending balance	54,301
Deferred revenue (current)
Beginning balance	100,406
Increase (decrease), net	(6,959)
Ending balance	93,447
Deferred revenue (long-term)
Beginning balance	20,482
Increase (decrease), net	803
Ending balance	$ 21,285

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