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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2025
Financial Instruments |
Schedule of estimated fair values of the financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of June 30, 2025 | ​ | As of December 31, 2024
​ |  | Book Value |  | Fair Value |  | Book Value |  | Fair Value
​ | ​ | (in thousands of $)
Cash and cash equivalents | ​ | $ | 546,164 | ​ | $ | 546,164 | ​ | $ | 453,384 | ​ | $ | 453,384
Marketable securities | ​ | $ | 107,919 | ​ | $ | 107,919 | ​ | $ | 60,850 | ​ | $ | 60,850
Secured long-term debt, including current portion(1) | ​ | $ | 507,560 | ​ | $ | 507,560 | ​ | $ | 481,780 | ​ | $ | 481,780
Unsecured long-term debt(1) | ​ | $ | 262,766 | ​ | $ | 226,291 | ​ | $ | 262,766 | ​ | $ | 259,834
Schedule of estimated fair value of the financial instruments that are measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements as of June 30, 2025
​ |  | Total |  | (Level I) |  | (Level II) |  | (Level III)
​ | ​ | (in thousands of $)
Marketable securities | ​ | $ | 107,919 | ​ | $ | 107,919 | ​ | $ | — | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements as of December 31, 2024
​ |  | Total |  | (Level I) |  | (Level II) |  | (Level III)
​ |  | (in thousands of $)
Marketable securities | ​ | $ | 60,850 | ​ | $ | 60,850 | ​ | $ | — | ​ | $ | —
Schedule of estimated fair value of the financial instruments, categorized based upon the fair value hierarchy | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements as of June 30, 2025
​ |  | Total |  | (Level I) |  | (Level II) |  | (Level III)
​ | ​ | ​ | (in thousands of $)
Cash and cash equivalents | ​ | $ | 546,164 | ​ | $ | 546,164 | ​ | $ | — | ​ | $ | —
Secured long-term debt, including current portion(1) | ​ | $ | 507,560 | ​ | $ | — | ​ | $ | 507,560 | ​ | $ | —
Unsecured long-term debt(1) | ​ | $ | 226,291 | ​ | $ | 226,291 | ​ | $ | — | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements as of December 31, 2024
​ |  | Total |  | (Level I) |  | (Level II) |  | (Level III)
​ | ​ | (in thousands of $)
Cash and cash equivalents | ​ | $ | 453,384 | ​ | $ | 453,384 | ​ | $ | — | ​ | $ | —
Secured long-term debt, including current portion(1) | ​ | $ | 481,780 | ​ | $ | — | ​ | $ | 481,780 | ​ | $ | —
Unsecured long-term debt(1) | ​ | $ | 259,834 | ​ | $ | 259,834 | ​ | $ | — | ​ | $ | —
(1) | Secured and unsecured long-term debt, including current portion is presented gross of deferred finance costs of $9.1 million and $9.8 million as of June 30, 2025 and December 31, 2024, respectively. The fair value of the Company’s secured debt is estimated based on currently available debt with similar contract terms, interest rate and remaining maturities.

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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 assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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