LEASES - Operating Lease Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Fixed lease costs	$ 4,818	$ 4,300
Short-term lease costs	455	285
Variable lease costs	1,278	1,321
Operating lease expenses	$ 6,551	$ 5,906