DERIVATIVE FINANCIAL INSTRUMENTS - Summary of Contracts for Oil and Natural Gas (Details)	Sep. 30, 2021 USD ($) bbl $ / bbl
Open costless collar contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) \| $	$ (97,084,000)
Open Swap Contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) \| $	(19,999,000)
Open Basis Swap Contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) \| $	$ 4,016,000
Derivative Contract, Calculation Period One \| Open costless collar contracts \| Oil
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	2,370,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	42.06
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	55.15
Fair Value of Asset (Liability) \| $	$ (46,669,000)
Derivative Contract, Calculation Period One \| Open costless collar contracts \| Natural Gas
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	13,900,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	2.53
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	4.71
Fair Value of Asset (Liability) \| $	$ (24,169,000)
Derivative Contract, Calculation Period One \| Open Swap Contracts \| Oil
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	510,000
Fair Value of Asset (Liability) \| $	$ (19,999,000)
Fixed Price ($/Bbl)	35.26
Derivative Contract, Calculation Period One \| Open Basis Swap Contracts \| Oil Basis
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	2,100,000
Fair Value of Asset (Liability) \| $	$ 623,000
Fixed Price ($/Bbl)	0.87
Derivative Contract, Calculation Period Two \| Open costless collar contracts \| Natural Gas
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	8,250,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	2.70
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	6.33
Fair Value of Asset (Liability) \| $	$ (11,844,000)
Derivative Contract, Calculation Period Three \| Open costless collar contracts \| Oil
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	2,040,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	50.00
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	67.85
Fair Value of Asset (Liability) \| $	$ (14,402,000)
Derivative Contract, Calculation Period Three \| Open Basis Swap Contracts \| Oil Basis
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	5,520,000
Fair Value of Asset (Liability) \| $	$ 3,393,000
Fixed Price ($/Bbl)	0.95

Open costless collar contracts for oil and natural gas.

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

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- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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- Definition

Nominal number of units used to calculate payment on derivative.

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- Definition

Average fixed price related to the group of price risk swap derivatives.

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