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Other Comprehensive Income (Loss) (AOCI Reclassifications) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Defined benefit pension plan adjustments/Unrealized loss in fair value of investment adjustments | $ (2,967) | $ (397) | $ (12,442) | $ (5,114)
Income tax benefit | (4,086) | 560 | (52,004) | (47,047)
Net of tax | 36,896 | 32,455 | 123,626 | 117,092
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 | 413 | 639 | 1,239 | 1,916
Income tax benefit | (114) | (181) | (343) | (543)
Net of tax | 299 | 458 | 896 | 1,373
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 | 18 | 79 | 103 | 121
Income tax benefit | (4) | (16) | (22) | (25)
Net of tax | $ 14 | $ 63 | $ 81 | $ 96

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