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Components of Pension Plan Net Periodic Benefit Costs (Tables) | 9 Months Ended
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Sep. 30, 2025
Defined benefit pension plan |
Defined Benefit Plan Disclosure [Line Items] |
Components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ | ​ | 2025 |  | 2024 |  | 2025 |  | 2024 |
​ | ​ | (in thousands) | ​
Interest cost | ​ | $ | 1,311 | ​ | $ | 1,289 | ​ | $ | 3,931 | ​ | $ | 3,817 | ​
Expected return on plan assets | ​ |  | (1,713) | ​ |  | (1,752) | ​ |  | (5,131) | ​ |  | (5,278) | ​
Amortization of prior service cost | ​ | ​ | 2 | ​ | ​ | 47 | ​ | ​ | 7 | ​ | ​ | 140 | ​
Amortization of net loss | ​ |  | — | ​ |  | 136 | ​ |  | — | ​ |  | 245 | ​
Net periodic benefit credit (1) | ​ | $ | (400) | ​ | $ | (280) | ​ | $ | (1,193) | ​ | $ | (1,076) | ​
| (1) | Net periodic benefit credit for the Pension Plan is included in the Other income (expense) line item within our condensed consolidated statements of income.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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