v3.26.1
DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) Note
$ in Thousands
 6 Months Ended
Jun. 30, 2026
USD ($)
Bcf
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Bcf
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Fair Value Assets, Transfers between Levels $ 0 $ 0  
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     0.50
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 11.70   5.02
Other Assets      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Assets, Fair Value Disclosure $ 30,247   $ 30,599
Other Assets | US Treasury Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Debt Securities, Trading and Available-for-Sale 8,267   9,329
Other Assets | Corporate Bond Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Debt Securities, Trading and Available-for-Sale 19,103   18,643
Other Assets | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Equity Securities, FV-NI 2,877   2,627
Other Current Liabilities | Swap      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Derivative Liability, Subject to Master Netting Arrangement, after Offset 600   7,309
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Assets, Fair Value Disclosure 11,144   11,956
Fair Value, Inputs, Level 1 [Member] | Other Assets | US Treasury Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Debt Securities, Trading and Available-for-Sale 8,267   9,329
Fair Value, Inputs, Level 1 [Member] | Other Assets | Corporate Bond Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Debt Securities, Trading and Available-for-Sale 0   0
Fair Value, Inputs, Level 1 [Member] | Other Assets | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Equity Securities, FV-NI 2,877   2,627
Fair Value, Inputs, Level 1 [Member] | Other Current Liabilities | Swap      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Derivative Liability, Subject to Master Netting Arrangement, before Offset 0   0
Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Assets, Fair Value Disclosure 19,103   18,643
Fair Value, Inputs, Level 2 [Member] | Other Assets | US Treasury Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Debt Securities, Trading and Available-for-Sale 0   0
Fair Value, Inputs, Level 2 [Member] | Other Assets | Corporate Bond Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Debt Securities, Trading and Available-for-Sale 19,103   18,643
Fair Value, Inputs, Level 2 [Member] | Other Assets | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Equity Securities, FV-NI 0   0
Fair Value, Inputs, Level 2 [Member] | Other Current Liabilities | Swap      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Derivative Liability, Subject to Master Netting Arrangement, before Offset 624   7,309
Master Netting Arrangement      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Assets, Fair Value Disclosure 0   0
Master Netting Arrangement | Other Assets | US Treasury Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Debt Securities, Trading and Available-for-Sale 0   0
Master Netting Arrangement | Other Assets | Corporate Bond Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Debt Securities, Trading and Available-for-Sale 0   0
Master Netting Arrangement | Other Assets | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Equity Securities, FV-NI 0   0
Master Netting Arrangement | Other Current Liabilities | Swap      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset $ (24)   $ 0