LEASES - Summary of Lease Expense and Weighted Average (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 1,765	$ 4,495
Short-term lease cost	21	69
Total lease cost	$ 1,786	$ 4,564
Weighted average remaining lease term	5 years 2 months 12 days	5 years 2 months 12 days
Weighted average discount rate	4.70%	4.70%