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Pension Plans and Other Postretirement Benefits (Details-4)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
Concentration
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 447,884 $ 412,038  
Pension Benefits [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 100.00%    
Actual Plan Asset Allocation 100.00% 100.00%  
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 404,735 $ 370,171 $ 473,953
Pension Benefits [Member] | Plan Assets [Member] | Product Concentration Risk [Member]      
Concentration of Credit Risk [Abstract]      
Concentration Risk, Percentage 10.00%    
Concentration risk, number of significant concentrations | Concentration 0    
Pension Benefits [Member] | Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation [1] 63.00%    
Actual Plan Asset Allocation [1] 64.00% 65.00%  
Pension Benefits [Member] | United States Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 45.50%    
Pension Benefits [Member] | Non-United States Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 17.50%    
Pension Benefits [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 30.00%    
Actual Plan Asset Allocation 30.00% 26.00%  
Pension Benefits [Member] | Real Estate [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 7.00%    
Actual Plan Asset Allocation 6.00% 9.00%  
Postretirement Benefits [Member]      
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 43,149 $ 41,867 $ 54,844
Master Pension Trust [Member]      
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 37,200 $ 36,300  
[1] Target allocations for equity securities are broken out as follows: 45.5% United States equity and 17.5% non-United States equity.