LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Leases [Abstract]
Operating cash flows from finance leases	$ 643	$ 597
Operating cash flows from operating leases	22,974	19,303
Financing cash flows from finance leases	7,466	5,039
Right-of-use assets obtained in exchange for lease obligations:
Finance leases	2,418	2,006
Operating leases	$ 16,605	$ 16,908