v3.26.1
DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) Note
$ in Thousands
 3 Months Ended
Mar. 31, 2026
USD ($)
Bcf
Mar. 31, 2025
USD ($)
Dec. 31, 2025
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 27,858   $ 30,599
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset 0   0
Long-term Debt, Fair Value $ 2,500,000   $ 2,500,000
Commodity Option      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Derivative, Nonmonetary Notional Amount | Bcf 0   0.50
Premiums recorded in other current assets on natural gas contracts held     $ 500
Swap      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Derivative, Nonmonetary Notional Amount | Bcf 0   5.02
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 $ 7,381   $ 9,329
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 17,971   18,643
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 2,506   2,627
Other Current Liabilities | Swap      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Financial Instruments, Owned, at Fair Value 0   7,309
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 9,887   11,956
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 7,381   9,329
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 2,506   2,627
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 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 17,971   18,643
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 17,971   18,643
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   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 0   7,309
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset $ 0   $ 0