DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) Note $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($) Bcf	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) Bcf
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value Assets, Transfers between Levels	$ 0	$ 0
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	26,895		$ 21,892
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset	0		(25)
Long-term Debt, Fair Value	$ 2,500,000		$ 2,200,000
Commodity Option
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative, Nonmonetary Notional Amount | Bcf	0.80		0.60
Premiums recorded in other current assets on natural gas contracts held	$ 800		$ 600
Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative, Nonmonetary Notional Amount | Bcf	7.65		6.20
Other Current Assets | Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement			$ 0
Other Assets | US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	$ 8,561		8,721
Other Assets | Corporate Bond Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	15,767		13,171
Other Assets | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	2,567
Other Current Liabilities | Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Instruments, Owned, at Fair Value	6,921		3,213
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	11,128		8,721
Fair Value, Inputs, Level 1 [Member] | Other Current Assets | Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement			0
Fair Value, Inputs, Level 1 [Member] | Other Assets | US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	8,561		8,721
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset	0		0
Fair Value, Inputs, Level 1 [Member] | Other Assets | Corporate Bond Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	0		0
Fair Value, Inputs, Level 1 [Member] | Other Assets | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	2,567
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset	0
Fair Value, Inputs, Level 1 [Member] | Other Current Liabilities | Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Instruments, Owned, at Fair Value	0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	15,767		13,196
Fair Value, Inputs, Level 2 [Member] | Other Current Assets | Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement			25
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset			(25)
Fair Value, Inputs, Level 2 [Member] | Other Assets | US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	0		0
Fair Value, Inputs, Level 2 [Member] | Other Assets | Corporate Bond Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	15,767		13,171
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset	0		0
Fair Value, Inputs, Level 2 [Member] | Other Assets | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement	0
Fair Value, Inputs, Level 2 [Member] | Other Current Liabilities | Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Instruments, Owned, at Fair Value	6,921		3,238
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset	$ 0		$ (25)