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DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) Note $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) Bcf | Dec. 31, 2022 USD ($) Bcf
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Premiums recorded in other current assets on natural gas contracts held | $ 500 | $ 14,100
Fair Value Assets, Transfers between Levels | $ 0 |
Swap |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative, Nonmonetary Notional Amount | Bcf | 5.1 |
Commodity Option |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative, Nonmonetary Notional Amount | Bcf | 0.5 | 19.4
Other Assets | US Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | $ 6,496 | $ 4,695
Other Assets | Corporate Bond Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 11,080 | 9,710
Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 17,576 | 14,405
Other Current Liabilities | Swap |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Financial Instruments, Owned, at Fair Value | 13,920 |
Fair Value, Inputs, Level 1 [Member] | Other Assets | US Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 6,496 | 4,695
Fair Value, Inputs, Level 1 [Member] | Other Assets | Corporate Bond Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 6,496 | 4,695
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 |
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term Debt, Fair Value | 2,800,000 | 2,500,000
Fair Value, Inputs, Level 2 [Member] | Other Assets | US Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset, Fair Value, 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, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 11,080 | 9,710
Fair Value, Inputs, Level 2 [Member] | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 11,080 | $ 9,710
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 | $ 13,920 |

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