LONG-TERM DEBT - Narrative (Details) - Private Placement Senior Note Payable - USD ($) $ in Millions	1 Months Ended
	Apr. 30, 2018	Oct. 31, 2017
Private Placement Senior Note Payable at 3.30%
Line Of Credit Facility [Line Items]
Amount of note		$ 50
Interest rate percentage		3.30%
Term of note		12 years
Private Placement Senior Note Payable at 3.97% | Subsequent Event
Line Of Credit Facility [Line Items]
Amount of note	$ 100
Interest rate percentage	3.97%
Term of note	30 years