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Other Comprehensive Income (Loss) (AOCI Reclassifications) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Defined benefit pension plan adjustments $ (7,457) $ (4,487) $ (18,349) $ (15,636)
Income tax expense (benefit) 15,154 (33,941) 50,026 (19,355)
Net of tax (3,631) 100,862 (51,603) 84,290
Defined benefit pension plan adjustments | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Defined benefit pension plan adjustments 420 282 1,228 1,157
Income tax expense (benefit) (113) (75) (330) (308)
Net of tax 307 207 898 849
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 (14) 113 (37) 132
Income tax expense (benefit) 3 (24) 8 (28)
Net of tax $ (11) $ 89 $ (29) $ 104