LEASES - Summary of Lease Expense and Weighted Average (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 3,568	$ 1,765	$ 7,562	$ 4,495
Short-term lease cost	11	21	49	69
Total lease cost	$ 3,579	$ 1,786	$ 7,611	$ 4,564
Weighted average remaining lease term	13 years		13 years		5 years
Weighted average discount rate	5.00%		5.00%		4.70%