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DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Notes) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Fair Value Disclosures | DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS Derivative Instruments - Our derivatives are comprised of over-the-counter natural gas fixed price swaps and call options. Swaps - At December 31, 2023, we held over-the-counter natural gas fixed-price swaps for the heating season ending March 2024, with a total notional amount of 5.1 Bcf. We did not hold any swaps at December 31, 2022. Options - At December 31, 2023, we held natural gas call options for the heating season ending March 2024, with total notional amounts of 0.5 Bcf, for which we paid premiums of $0.5 million. At December 31, 2022, we held purchased natural gas call options for the heating season ended March 2023, with total notional amounts of 19.4 Bcf, for which we paid premiums of $14.1 million. The fair value of our natural gas call options was insignificant as of December 31, 2023 and 2022. We have not designated any of our derivative instruments as accounting hedges. These contracts are included in, and recoverable through, our purchased-gas cost adjustment mechanisms. Additionally, premiums paid, changes in fair value and any settlements received associated with these contracts are deferred as part of our unrecovered purchased-gas costs in our consolidated balance sheets. There were no transfers between levels for the periods presented. Other Financial Instruments - The approximate fair value of cash and cash equivalents, restricted cash and cash equivalents, accounts receivable and accounts payable is equal to book value, due to the short-term nature of these items. Commercial paper is due upon demand and, therefore, the carrying amounts approximate fair value. The following tables summarize, by level within the fair value hierarchy, our derivative and other assets and liabilities that were accounted for at fair value on a recurring basis at December 31, 2023 and 2022:
| December 31, 2023
| Level 1 |  | Level 2 |  |  |  | Total
| (Thousands of dollars)
Assets: |  |  |  |  |  |  |
United States treasury notes (b) | $ | 6,496 |  |  | $ | — |  |  |  |  | $ | 6,496 |
Corporate bonds (b) | — |  |  | 11,080 |  |  |  |  | 11,080 |
Total assets | $ | 6,496 |  |  | $ | 11,080 |  |  |  |  | $ | 17,576 |
Liabilities: |  |  |  |  |  |  |
Derivative instruments - swaps (a) | $ | — |  |  | $ | 13,920 |  |  |  |  | $ | 13,920 |
(a) The fair value is included in other current assets and other current liabilities in our consolidated balance sheets. (b) The fair value is included in other current and noncurrent assets and other current and noncurrent liabilities in our consolidated balance sheets.
| December 31, 2022
| Level 1 |  | Level 2 |  | Total
| (Thousands of dollars)
Assets: |  |  |  |  |
United States treasury notes (b) | $ | 4,695 |  |  | $ | — |  |  | $ | 4,695 |
Corporate bonds (b) | — |  |  | 9,710 |  |  | 9,710 |
Total assets | $ | 4,695 |  |  | $ | 9,710 |  |  | $ | 14,405 |
(a) The fair value is included in other current assets and other current liabilities in our consolidated balance sheets. (b) The fair value is included in other current and noncurrent assets and other current and noncurrent liabilities in our consolidated balance sheets. The estimated fair value of our long-term debt, including current maturities, was $2.8 billion and $2.5 billion at December 31, 2023 and December 31, 2022, respectively. The estimated fair value of our long-term debt was determined using quoted market prices, and is classified as Level 2.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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