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Financial Instruments and Risk Management (Tables) | 9 Months Ended
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Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Volumes Per Day Associated with Outstanding Natural Gas Derivative Contracts and the Weighted Average Prices for these Contracts | At September 30, 2025, volumes per day associated with outstanding natural gas derivative contracts and the weighted average prices for these contracts are as follows:
NYMEX Henry Hub | Area | Commodity | Volumes MMCF/d | Price/MCF | Start Date | End Date
Fixed price derivative swap | United States | Natural Gas | 60 | $ | 3.74 |  | 10/1/2025 | 12/31/2025
Schedule of Fair Value of Derivative Instruments Not Designated as Hedging Instruments | At September 30, 2025 and December 31, 2024, the fair value of derivative instruments not designated as hedging instruments are presented in the following table:
(Thousands of dollars) |  | Asset (Liability) Derivatives Fair Value
Type of Derivative Contract |  | Balance Sheet Location |  | September 30, 2025 |  | December 31, 2024
Commodity swaps |  | Accounts receivable |  | $ | 2,197 |  |  | $ | — |
Commodity swaps |  | Accounts payable |  | $ | — |  |  | $ | (1,707) |
Schedule of Recognized Gains and Losses for Derivative Instruments Not Designated as Hedging Instruments | For the three-month and nine-month periods ended September 30, 2025 and 2024, the gains and losses recognized in the Consolidated Statements of Operations for derivative instruments not designated as hedging instruments are presented in the following table:
|  |  |  |  |  | Gain (Loss) |  | Gain (Loss)
(Thousands of dollars) |  |  |  |  |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Type of Derivative Contract |  | Statement of Operations Location |  |  |  |  |  | 2025 |  | 2024 |  | 2025 |  | 2024
Commodity swaps |  | Gain (loss) on derivative instruments |  |  |  |  |  | $ | 5,722 |  |  | $ | (1,344) |  |  | $ | 7,071 |  |  | $ | (1,344) |
Schedule of Carrying Value of Assets and Liabilities Recorded at Fair Value on Recurring Basis | The fair value measurements for these assets and liabilities at September 30, 2025 and December 31, 2024, are shown in the following table.
|  | September 30, 2025 |  | December 31, 2024
(Thousands of dollars) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity swaps |  | $ | — |  |  | $ | 2,197 |  |  | $ | — |  |  | $ | 2,197 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
|  | $ | — |  |  | $ | 2,197 |  |  | $ | — |  |  | $ | 2,197 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity swaps |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,707 |  |  | $ | — |  |  | $ | 1,707 |
Nonqualified employee savings plan |  | 21,168 |  |  | — |  |  | — |  |  | 21,168 |  |  | 19,469 |  |  | — |  |  | — |  |  | 19,469 |
|  | $ | 21,168 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,168 |  |  | $ | 19,469 |  |  | $ | 1,707 |  |  | $ | — |  |  | $ | 21,176 |
Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments | The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at September 30, 2025 and December 31, 2024. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The table excludes cash and cash equivalents, trade accounts receivable, trade accounts payable and accrued expenses, all of which had fair values approximating carrying amounts. The fair value of current and long-term debt was estimated based on rates offered to the Company at that time for debt of the same maturities. Substantially all of the Company’s long-term debt is actively traded in open markets, and accordingly, is classified as Level 1 in the fair value hierarchy. The Company has off-balance sheet exposures relating to certain letters of credit. The fair value of these, which represents fees associated with obtaining the instruments, were minimal.
| September 30, 2025 |  | December 31, 2024
(Thousands of dollars) | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial liabilities: |  |  |  |  |  |  |
Current and long-term debt | $ | 1,426,153 |  |  | $ | 1,366,561 |  |  | $ | 1,275,374 |  |  | $ | 1,185,961 |
Schedule of Fair Value Measurements, Nonrecurring | The fair value information associated with the impaired properties is presented in the following tables.
| Nine Months Ended September 30, 2025
|  |  |  |  |  |  | Net Book Value Prior to Impairment |  | Total Pretax Impairment
| Fair Value |  |
(Thousands of dollars) | Level 1 |  | Level 2 |  | Level 3 |  |
Property, plant and equipment: |  |  |  |  |  |  |  |  |
Impaired proved properties |  |  |  |  |  |  |  |  |
United States - Offshore | $ | — |  |  | $ | — |  |  | $ | 42,397 |  |  | $ | 157,399 |  |  | $ | 115,002 |
| Nine Months Ended September 30, 2024
|  |  |  |  |  |  | Net Book Value Prior to Impairment |  | Total Pretax Impairment
| Fair Value |  |
(Thousands of dollars) | Level 1 |  | Level 2 |  | Level 3 |  |
Property, plant and equipment: |  |  |  |  |  |  |  |  |
Impaired proved properties |  |  |  |  |  |  |  |  |
United States - Offshore | $ | — |  |  | $ | — |  |  | $ | 437 |  |  | $ | 34,965 |  |  | $ | 34,528 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 182 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-182 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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