SIGNIFICANT ACCOUNTING POLICIES - Depletion and Depletion per BOE Sold (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / bbl	Dec. 31, 2018 USD ($) $ / bbl	Dec. 31, 2017 USD ($) $ / bbl
Accounting Policies [Abstract]
Depletion of Proved Oil and Natural Gas Properties | $	$ 209,050	$ 118,974	$ 58,801
Depletion per BOE Sold (in dollars per barrel) | $ / bbl	14.84	12.75	10.89