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Postretirement Benefits - Fair Value Measurement for Pension Plan Assets by Major Category and Level of Input (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair value measurements of pension plan assets:      
Total  $ 996,879 $ 829,866 $ 1,140,243
Employee Pension Plan      
Fair value measurements of pension plan assets:      
Total  996,879 829,866  
Employee Pension Plan | Level 1 Fair Value      
Fair value measurements of pension plan assets:      
Total  383,832 327,080  
Employee Pension Plan | Level 2 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Employee Pension Plan | Level 3 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Employee Pension Plan | Net Asset Value (NAV)      
Fair value measurements of pension plan assets:      
Total  613,047 502,786  
Total equity securities | Employee Pension Plan      
Fair value measurements of pension plan assets:      
Total  444,407 379,419  
Total equity securities | Employee Pension Plan | Level 1 Fair Value      
Fair value measurements of pension plan assets:      
Total  372,122 315,637  
Total equity securities | Employee Pension Plan | Level 2 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Total equity securities | Employee Pension Plan | Level 3 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Total equity securities | Employee Pension Plan | Net Asset Value (NAV)      
Fair value measurements of pension plan assets:      
Total  72,285 63,782  
U.S. equity securities | Employee Pension Plan      
Fair value measurements of pension plan assets:      
Total  261,400 219,410  
U.S. equity securities | Employee Pension Plan | Level 1 Fair Value      
Fair value measurements of pension plan assets:      
Total  244,979 204,838  
U.S. equity securities | Employee Pension Plan | Level 2 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
U.S. equity securities | Employee Pension Plan | Level 3 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
U.S. equity securities | Employee Pension Plan | Net Asset Value (NAV)      
Fair value measurements of pension plan assets:      
Total  16,421 14,572  
Non-U.S. equity securities | Employee Pension Plan      
Fair value measurements of pension plan assets:      
Total  183,007 160,009  
Non-U.S. equity securities | Employee Pension Plan | Level 1 Fair Value      
Fair value measurements of pension plan assets:      
Total  127,143 110,799  
Non-U.S. equity securities | Employee Pension Plan | Level 2 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Non-U.S. equity securities | Employee Pension Plan | Level 3 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Non-U.S. equity securities | Employee Pension Plan | Net Asset Value (NAV)      
Fair value measurements of pension plan assets:      
Total  55,864 49,210  
Debt securities | Employee Pension Plan      
Fair value measurements of pension plan assets:      
Total  540,762 439,004  
Debt securities | Employee Pension Plan | Level 1 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Debt securities | Employee Pension Plan | Level 2 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Debt securities | Employee Pension Plan | Level 3 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Debt securities | Employee Pension Plan | Net Asset Value (NAV)      
Fair value measurements of pension plan assets:      
Total  540,762 439,004  
Other | Employee Pension Plan      
Fair value measurements of pension plan assets:      
Total  11,710 11,443  
Other | Employee Pension Plan | Level 1 Fair Value      
Fair value measurements of pension plan assets:      
Total  11,710 11,443  
Other | Employee Pension Plan | Level 2 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Other | Employee Pension Plan | Level 3 Fair Value      
Fair value measurements of pension plan assets:      
Total  0 0  
Other | Employee Pension Plan | Net Asset Value (NAV)      
Fair value measurements of pension plan assets:      
Total  $ 0 $ 0