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REVENUE RECOGNITION - Schedule of Customer Assets & Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accounts receivable
Beginning balance	$ 174,310	$ 149,122
Increase (decrease), net	(5,808)	25,188
Ending balance	168,502	174,310
Unbilled accounts receivable
Beginning balance	13,543	16,034
Increase (decrease), net	10,661	(2,491)
Ending balance	24,204	13,543
Deferred revenue (current)
Beginning balance	105,087	100,571
Increase (decrease), net	(4,681)	4,516
Ending balance	100,406	105,087
Deferred revenue (long-term)
Beginning balance	17,572	14,184
Increase (decrease), net	2,910	3,388
Ending balance	$ 20,482	$ 17,572

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