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Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrecognized pension income, net of tax $ (56,959) $ (32,514) $ (46,206) $ (28,584)
Unrealized gain on foreign currency derivatives 207 $ 0    
Accumulated Other Comprehensive Income 2,607   2,365  
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 1,794   1,759  
Unrealized gain on foreign currency derivatives $ 813   $ 606