v3.25.3

FAIR VALUE MEASUREMENTS (Details) $ in Thousands	9 Months Ended	12 Months Ended
FAIR VALUE MEASUREMENTS (Details) $ in Thousands	Sep. 30, 2025 USD ($) businessCombination	Dec. 31, 2024 USD ($) businessCombination
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Gross fair value, assets	$ 17,513	$ 5,634
Effect of counterparty netting, assets	(8,408)	(3,810)
Total net carrying value on balance sheet, assets	9,105	1,824
Gross fair value, liabilities	13,501	19,243
Effect of counterparty netting, liabilities	(8,408)	(3,810)
Total net carrying value on balance sheet, liabilities	$ 5,093	$ 15,433
Number of business combinations \| businessCombination	0	0
Commodity derivative instruments \| Fair Value Measurements, Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Effect of counterparty netting, assets	$ (8,408)	$ (3,810)
Total net carrying value on balance sheet, assets	9,105	1,824
Effect of counterparty netting, liabilities	(8,408)	(3,810)
Total net carrying value on balance sheet, liabilities	5,093	15,433
Commodity derivative instruments \| Fair Value Measurements, Recurring Basis \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Gross fair value, assets	0	0
Gross fair value, liabilities	0	0
Commodity derivative instruments \| Fair Value Measurements, Recurring Basis \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Gross fair value, assets	17,513	5,634
Gross fair value, liabilities	13,501	19,243
Commodity derivative instruments \| Fair Value Measurements, Recurring Basis \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Gross fair value, assets	0	0
Gross fair value, liabilities	$ 0	$ 0

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Black Stone Minerals, L.P. 10-Q