LEASES - Other lease cost information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
LEASES
Cash paid for operating leases	$ 5,574	$ 2,891
Right-of-use assets obtained in exchange for operating lease liabilities	$ 22,208	$ 38,311
Weighted average remaining lease term (in years)	9 years 8 months 12 days	8 years 4 months 24 days
Weighted average discount rate	4.30%	3.80%