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Pension and Postretirement Benefits Other Than Pension Plans | 9 Months Ended
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Sep. 30, 2019
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 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, | ​
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Interest cost | ​ | $ | 798 | ​ | $ | 808 | ​ | $ | 2,554 | ​ | $ | 2,422 | ​
Expected return on plan assets | ​ |  | (935) | ​ |  | (1,087) | ​ |  | (2,822) | ​ |  | (3,259) | ​
Amortization of net actuarial loss | ​ |  | 293 | ​ |  | 259 | ​ |  | 866 | ​ |  | 778 | ​
Net settlement loss | ​ | ​ | 1,577 | ​ | ​ | 1,004 | ​ | ​ | 1,577 | ​ | ​ | 1,004 | ​
Total net periodic pension expense | ​ | $ | 1,733 | ​ | $ | 984 | ​ | $ | 2,175 | ​ | $ | 945 | ​
​ As a result of increased lump-sum distributions from the Company’s qualified retirement plan during 2019 and 2018, net settlement losses of $1.6 million and $1.0 million were recognized in the three months and nine months ended September 30, 2019 and 2018, respectively. ​ In addition, the increase in lump-sum distributions required the Company to re-measure its liability under its pension plan as of August 31, 2019. As a result of the re-measurement, as well as a decrease in the pension plan’s assumed discount rate from 3.95% at December 31, 2018 to 2.63% at August 31, 2019, the Company recorded a $5.2 million increase in its liability under the pension plan and a corresponding increase in accumulated other comprehensive loss in the accompanying condensed consolidated balance sheet at September 30, 2019. ​ 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 | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Interest cost | ​ | $ | 26 | ​ | $ | 24 | ​ | $ | 76 | ​ | $ | 72 | ​
Amortization of net actuarial loss | ​ |  | 55 | ​ |  | 64 | ​ |  | 178 | ​ |  | 193 | ​
Amortization of prior service credit | ​ |  | (329) | ​ |  | (329) | ​ |  | (986) | ​ |  | (986) | ​
Total net postretirement benefit income | ​ | $ | (248) | ​ | $ | (241) | ​ | $ | (732) | ​ | $ | (721) | ​
​

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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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