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Components of Net Periodic Benefit Cost (Tables) | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
Net Periodic Benefit Cost (Increase) | Net periodic (decrease) increase in benefit cost for pension benefits and other post-retirement benefits for the three and nine months ended September 30, 2020 and 2019 includes the following components (in thousands):
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | Pension benefits |  | Other post-retirement benefits |  | Pension benefits |  | Other post-retirement benefits
|  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost |  | $ | — |  |  | — |  |  | 19 |  |  | 20 |  |  | $ | — |  |  | — |  |  | 59 |  |  | 60 |
Interest cost |  | 250 |  |  | 299 |  |  | 178 |  |  | 209 |  |  | 750 |  |  | 899 |  |  | 534 |  |  | 628 |
Expected return on plan assets |  | (737) |  |  | (640) |  |  | — |  |  | — |  |  | (2,211) |  |  | (1,922) |  |  | — |  |  | — |
Amortization of prior service cost |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of the net loss (gain) |  | 174 |  |  | 254 |  |  | (62) |  |  | (206) |  |  | 522 |  |  | 762 |  |  | (186) |  |  | (620) |
Net periodic (decrease) increase in benefit cost |  | $ | (313) |  |  | (87) |  |  | 135 |  |  | 23 |  |  | $ | (939) |  |  | (261) |  |  | 407 |  |  | 68 |

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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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