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Pension and Postretirement Benefits Other than Pension Plans | 6 Months Ended
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Jun. 30, 2020
Pension and Postretirement Benefits Other Than Pension Plans |
Pension and Postretirement Benefits Other than Pension Plans | 11. PENSION AND POSTRETIREMENT BENEFITS OTHER THAN PENSION PLANS: Net periodic pension expense (benefit) 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 | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
Interest cost | ​ | $ | 675 | ​ | $ | 878 | ​ | $ | 1,351 | ​ | $ | 1,756 | ​
Expected return on plan assets | ​ |  | (1,054) | ​ |  | (943) | ​ |  | (2,109) | ​ |  | (1,887) | ​
Amortization of net actuarial loss | ​ |  | 281 | ​ |  | 286 | ​ |  | 563 | ​ |  | 573 | ​
Total net periodic pension expense (benefit) | ​ | $ | (98) | ​ | $ | 221 | ​ | $ | (195) | ​ | $ | 442 | ​
​ Net postretirement benefit income 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 | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
Interest cost | ​ | $ | 18 | ​ | $ | 25 | ​ | $ | 35 | ​ | $ | 50 | ​
Amortization of net actuarial loss | ​ |  | 64 | ​ |  | 62 | ​ |  | 127 | ​ |  | 123 | ​
Amortization of prior service credit | ​ |  | (329) | ​ |  | (329) | ​ |  | (657) | ​ |  | (657) | ​
Total net postretirement benefit income | ​ | $ | (247) | ​ | $ | (242) | ​ | $ | (495) | ​ | $ | (484) | ​
​

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