DEFERRED CONTRACT COSTS - Schedule of Amortization of Deferred Contract Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Amortization of deferred contract costs	$ 29,152	$ 17,271	$ 12,106