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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