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Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Unrecognized pension income, net of tax $ (156,317) $ (46,206) $ (48,829) $ (44,269) $ (48,954) $ (28,584)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Unrecognized pension income, net of tax 1,868 1,759        
Unrealized loss on foreign currency derivatives (1,784) 606        
Accumulated Other Comprehensive Income $ 84 $ 2,365