DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Narrative (Details) bbl in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($) $ / bbl bbl
Open Commodity Swaps
Derivative [Line Items]
Volume (in barrels) | bbl	12.7
Weighted average price (in dollars per barrel) | $ / bbl	56.05
Open Commodity Natural Gas Price Swap
Derivative [Line Items]
Volume (in barrels) | bbl	12.8
Weighted average price (in dollars per barrel) | $ / bbl	2.41
Interest Rate Swap
Derivative [Line Items]
Notional amount | $	$ 200.0