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Other Comprehensive Income (Loss) (AOCI Reclassifications) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Defined benefit pension plan adjustments/Unrealized loss in fair value of investment adjustments | $ (4,487) | $ (2,967) | $ (15,636) | $ (12,442)
Income tax expense (benefit) | (33,941) | (4,086) | (19,355) | (52,004)
Net of tax | 100,862 | 36,896 | 84,290 | 123,626
Defined benefit pension plan adjustments | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Defined benefit pension plan adjustments/Unrealized loss in fair value of investment adjustments | 282 | 413 | 1,157 | 1,239
Income tax expense (benefit) | (75) | (114) | (308) | (343)
Net of tax | 207 | 299 | 849 | 896
Unrealized loss in fair value of investment adjustments | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Defined benefit pension plan adjustments/Unrealized loss in fair value of investment adjustments | 113 | 18 | 132 | 103
Income tax expense (benefit) | (24) | (4) | (28) | (22)
Net of tax | $ 89 | $ 14 | $ 104 | $ 81

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