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Investments | 9 Months Ended
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Sep. 30, 2025
Investments |
Investments | 4. Investments All our marketable securities are classified as held-to-maturity debt securities and reported at amortized cost pursuant to Accounting Standards Codification (“ASC”) 320, Investments – Debt and Equity Securities, as we have both the intent and ability to hold these investments to maturity. During the third quarter of 2025, we sold a held-to-maturity debt security with a face value of $400,000 prior to its maturity. The sale resulted in an immaterial realized loss, which was recorded within selling and administrative expenses in the Condensed Consolidated Statements of Earnings. The sale was prompted by a deterioration in the creditworthiness of the issuer and was made to minimize potential future losses. This transaction does not represent a change in our intent or ability to hold our remaining held-to-maturity debt securities until maturity. Below is a summary of the amortized cost and the estimated market values of our marketable securities as of September 30, 2025, and December 31, 2024. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2025 | ​ | December 31, 2024
​ |  | Amortized |  | Market |  | Amortized |  | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 747 | ​ | $ | 746 | ​ | $ | 852 | ​ | $ | 848
Due from one through five years | ​ |  | 3,046 | ​ |  | 3,053 | ​ |  | 2,692 | ​ |  | 2,677
Due from six through ten years | ​ |  | 1,839 | ​ |  | 1,797 | ​ |  | 2,837 | ​ |  | 2,749
Total | ​ | $ | 5,632 | ​ | $ | 5,596 | ​ | $ | 6,381 | ​ | $ | 6,274
​ The unrealized gains and losses on marketable securities at September 30, 2025, and at December 31, 2024, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2025 | ​ | December 31, 2024
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Marketable securities | ​ | $ | 14 | ​ | $ | (50) | ​ | $ | 5 | ​ | $ | (112)
​ The estimated market values provided are Level 2 valuations as defined by ASC 820, Fair Value Measurements and Disclosures. We reviewed our portfolio of investments as of September 30, 2025, and determined that no other-than-temporary market value impairment exists.

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