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Other Comprehensive Income (Loss) (AOCI Reclassifications) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Defined benefit pension plan adjustments/Unrealized loss in fair value of investment adjustments | $ (5,838) | $ (3,058) | $ (11,149) | $ (9,475)
Income tax expense (benefit) | 7,278 | 194 | 14,586 | (47,918)
Net of tax | (812) | 37,534 | (16,572) | 86,730
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 | 438 | 411 | 875 | 826
Income tax expense (benefit) | (117) | (115) | (233) | (229)
Net of tax | 321 | 296 | 642 | 597
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 | (38) | 55 | 19 | 85
Income tax expense (benefit) | 8 | (12) | (4) | (18)
Net of tax | $ (30) | $ 43 | $ 15 | $ 67

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