LEASES - Components of Lease Expense (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease expense	$ 6,624
Short-term lease expense	6,575
Variable lease expense	2,349
Total operating lease expense	15,548
Amortization of right-of-use assets	13
Operating cash flows from finance leases	14
Total finance lease expense	27
Sublease income	(67)
Net lease cost	$ 15,508