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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Tables) | 9 Months Ended
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Sep. 30, 2020
Defined benefit pension plan |
Employee Benefit Plans |
Components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ | ​ | 2020 |  | 2019 |  | 2020 |  | 2019 |
​ | ​ | (in thousands) | ​
Interest cost | ​ | $ | 1,030 | ​ | $ | 1,217 | ​ | $ | 3,138 | ​ | $ | 3,649 | ​
Expected return on plan assets | ​ |  | (1,413) | ​ |  | (1,233) | ​ |  | (4,396) | ​ |  | (3,699) | ​
Amortization of prior service cost | ​ | ​ | 47 | ​ | ​ | 46 | ​ | ​ | 140 | ​ | ​ | 139 | ​
Amortization of net loss | ​ |  | 969 | ​ |  | 980 | ​ |  | 3,096 | ​ |  | 2,941 | ​
Net periodic benefit cost (1) | ​ | $ | 633 | ​ | $ | 1,010 | ​ | $ | 1,978 | ​ | $ | 3,030 | ​
| (1) | Net periodic benefit cost for the Pension Plan is included in the Other expense line item within our condensed consolidated statements of income.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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