BASIS OF PRESENTATION - DISAGGREGATED REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Oil and gas sales	$ 189,963	$ 58,858	$ 420,157	$ 155,455
Crude oil sales
Disaggregation of Revenue [Line Items]
Oil and gas sales	131,360	47,251	297,515	127,331
Natural gas sales
Disaggregation of Revenue [Line Items]
Oil and gas sales	24,764	5,742	53,064	16,472
Natural gas liquids sales
Disaggregation of Revenue [Line Items]
Oil and gas sales	$ 33,839	$ 5,865	$ 69,578	$ 11,652

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details