LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Document Period End Date	Mar. 31, 2020
Short-term operating lease cost	$ 1,146	$ 1,684
Long-term operating lease cost	1,237	1,150
Total operating lease cost	2,383	2,834
Amortization of right-of-use asset	1,588	1,255
Interest on lease liabilities	83	107
Total finance lease cost	$ 1,671	$ 1,362