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REVENUE RECOGNITION - Schedule of Customer Assets & Liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Accounts receivable
Beginning balance	$ 149,122
Increase (decrease), net	25,188
Ending balance	174,310
Unbilled accounts receivable
Beginning balance	16,034
Increase (decrease), net	(2,491)
Ending balance	13,543
Deferred revenue (current)
Beginning balance	100,571
Increase (decrease), net	4,516
Ending balance	105,087
Deferred revenue (long-term)
Beginning balance	14,184
Increase (decrease), net	3,388
Ending balance	$ 17,572

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