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Pension Plans and Other Postretirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2020
General Discussion Of Pension And Other Postretirement Benefits [Abstract] |
Components of Net Periodic Benefit Costs | The following table sets forth the components of net periodic benefit costs for the three and nine months ended September 30 (dollars in thousands):
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Three months ended September 30: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 5,549 |  |  | $ | 4,948 |  |  | $ | 982 |  |  | $ | 754 |
Interest cost |  |  | 6,968 |  |  |  | 7,134 |  |  |  | 1,524 |  |  |  | 1,140 |
Expected return on plan assets |  |  | (8,625 | ) |  |  | (7,913 | ) |  |  | (590 | ) |  |  | (616 | )
Amortization of prior service cost |  |  | 75 |  |  |  | 75 |  |  |  | (275 | ) |  |  | (275 | )
Net loss recognition |  |  | 1,678 |  |  |  | 2,553 |  |  |  | 1,243 |  |  |  | 1,299 |
Net periodic benefit cost |  | $ | 5,645 |  |  | $ | 6,797 |  |  | $ | 2,884 |  |  | $ | 2,302 |
Nine months ended September 30: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 16,645 |  |  | $ | 14,770 |  |  | $ | 2,941 |  |  | $ | 2,279 |
Interest cost |  |  | 20,906 |  |  |  | 21,372 |  |  |  | 4,563 |  |  |  | 3,676 |
Expected return on plan assets |  |  | (26,375 | ) |  |  | (23,681 | ) |  |  | (1,810 | ) |  |  | (1,945 | )
Amortization of prior service cost |  |  | 225 |  |  |  | 225 |  |  |  | (825 | ) |  |  | (825 | )
Net loss recognition |  |  | 5,011 |  |  |  | 7,394 |  |  |  | 3,729 |  |  |  | 3,874 |
Net periodic benefit cost |  | $ | 16,412 |  |  | $ | 20,080 |  |  | $ | 8,598 |  |  | $ | 7,059 |

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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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