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Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2024
Benefit Plans |
Schedule of pension expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
​ | ​ | (In thousands)
Service cost | ​ | $ | 81 | ​ | $ | 76 | ​ | $ | 162 | ​ | $ | 152
Interest cost | ​ |  | 81 | ​ |  | 78 | ​ |  | 162 | ​ | ​ | 156
Expected return on assets | ​ |  | (156) | ​ |  | (133) | ​ |  | (312) | ​ | ​ | (266)
Amortization (accretion) of prior service cost and net loss | ​ |  | (22) | ​ |  | (10) | ​ |  | (44) | ​ | ​ | (20)
​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​
Pension (contra expense) expense | ​ | $ | (16) | ​ | $ | 11 | ​ | $ | (32) | ​ | $ | 22

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-4 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-2 + Details
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