LEASES - Schedule of Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Operating lease expense:
Operating lease expense	$ 1,324	$ 2,664
Finance lease expense:
Amortization of leased assets	207	428
Interest on lease liabilities	31	69
Total finance lease expense	238	497
Total lease expense	$ 1,562	$ 3,161