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Pension Plans and Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | Components of net periodic benefit cost included in net income were as follows:
|  | Pension Benefits |  | Other Benefits
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (In thousands)
Service cost |  | $ | 2,382 |  |  | $ | 1,914 |  |  | $ | 7,980 |  |  | $ | 6,839 |  |  | $ | 153 |  |  | $ | 145 |  |  | $ | 480 |  |  | $ | 434 |
Interest cost |  | 9,359 |  |  | 11,567 |  |  | 27,882 |  |  | 34,722 |  |  | 393 |  |  | 586 |  |  | 1,207 |  |  | 1,756 |
Expected return on plan assets |  | (19,368) |  |  | (17,490) |  |  | (57,943) |  |  | (52,344) |  |  | (675) |  |  | (627) |  |  | (2,019) |  |  | (1,882) |
Amortization of prior service cost (credit) |  | 877 |  |  | 727 |  |  | 2,527 |  |  | 2,177 |  |  | (48) |  |  | (78) |  |  | (145) |  |  | (233) |
Net periodic benefit (income) cost |  | $ | (6,750) |  |  | $ | (3,282) |  |  | $ | (19,554) |  |  | $ | (8,606) |  |  | $ | (177) |  |  | $ | 26 |  |  | $ | (477) |  |  | $ | 75 |

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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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