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Retirement Plans (Tables) | 3 Months Ended
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Mar. 31, 2022
Retirement Benefits [Abstract] |
Net period benefit cost for the pension and postretirement plans | The components of net periodic pension cost and net periodic benefit cost for the RAP and Postretirement Plan for the three months ended March 31, 2022 and 2021 were as follows:
| Three Months Ended Mar 31, |
($ in Thousands) | 2022 | 2021 |  |
Components of Net Periodic Benefit Cost |  |  |  |
RAP |  |  |  |
Service cost | $ | 923 |  | $ | 2,075 |  |  |
Interest cost | 1,772 |  | 1,623 |  |  |
Expected return on plan assets | (6,736) |  | (6,430) |  |  |
Amortization of prior service cost | (63) |  | (18) |  |  |
Amortization of actuarial loss | 74 |  | 1,050 |  |  |
Total net periodic pension cost | $ | (4,029) |  | $ | (1,701) |  |  |
Postretirement Plan |  |  |  |
Interest cost | $ | 13 |  | $ | 13 |  |  |
Amortization of prior service cost | (19) |  | (19) |  |  |
Total net periodic benefit cost | $ | (6) |  | $ | (6) |  |  |

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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=123447040&loc=d3e1928-114920 + Details
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