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Pension and Postretirement Benefits Other than Pension Plans | 3 Months Ended
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Mar. 31, 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 | ​
​ | ​ | March 31, | ​
​ |  | 2020 |  | 2019 |
Interest cost | ​ | $ | 676 | ​ | $ | 878 | ​
Expected return on plan assets | ​ |  | (1,055) | ​ |  | (944) | ​
Amortization of net actuarial loss | ​ |  | 282 | ​ |  | 287 | ​
Total net periodic pension expense (benefit) | ​ | $ | (97) | ​ | $ | 221 | ​
​ 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 | ​
​ | ​ | March 31, | ​
​ |  | 2020 |  | 2019 |
Interest cost | ​ | $ | 17 | ​ | $ | 25 | ​
Amortization of net actuarial loss | ​ |  | 63 | ​ |  | 61 | ​
Amortization of prior service credit | ​ |  | (328) | ​ |  | (328) | ​
Total net postretirement benefit income | ​ | $ | (248) | ​ | $ | (242) | ​
​

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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