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Pension Plans (Tables) | 9 Months Ended
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Sep. 30, 2023
Pension Plan [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Net Periodic Pension and Postretirement Benefit (Income) Expense | Net periodic pension expense reflected in other gains and (losses), net in the accompanying condensed consolidated statements of operations included the following components for the respective periods (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022 |
Interest cost | ​ | $ | 787 | ​ | $ | 763 | ​ | $ | 2,437 | ​ | $ | 1,829 | ​
Expected return on plan assets | ​ |  | (728) | ​ |  | (820) | ​ |  | (2,187) | ​ |  | (2,882) | ​
Amortization of net actuarial loss | ​ |  | 195 | ​ |  | 271 | ​ |  | 651 | ​ |  | 694 | ​
Net settlement loss | ​ | ​ | — | ​ | ​ | 723 | ​ | ​ | — | ​ | ​ | 1,576 | ​
Total net periodic pension expense | ​ | $ | 254 | ​ | $ | 937 | ​ | $ | 901 | ​ | $ | 1,217 | ​

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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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