LEASES - Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Short-term operating lease cost	$ 1,684
Long-term operating lease cost	1,150
Total operating lease cost	2,834
Finance lease cost:
Amortization of right-of-use asset	1,255
Interest of lease liabilities	107
Total finance lease cost	$ 1,362