LEASES - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Short-term lease expense	$ 309	$ 870
Other operating lease cost	6,081	17,957
Total operating lease cost	$ 6,390	$ 18,827