LEASES - Supplemental cash flow related to leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 16,585	$ 15,858
Operating cash flows from finance leases	355	280
Financing cash flows from finance leases	175	101
Right-of-use assets obtained in exchange for new or modified lease obligations:
Operating leases	10,914	8,889
Finance leases	$ 0	$ 0