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Pension Plans and Other Postretirement Benefits (Details-4)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
concentration
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 434,922 $ 366,301  
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 $ 386,033 $ 323,780 $ 361,651
Pension Benefits [Member] | Plan Assets [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 64.00% 60.00%  
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 29.00% 33.00%  
Pension Benefits [Member] | Real Estate [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 7.00%    
Actual Plan Asset Allocation 7.00% 7.00%  
Postretirement Benefits [Member]      
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 48,889 $ 42,521 $ 48,470
Postretirement Benefits [Member] | Plan Assets [Member]      
Concentration of Credit Risk [Abstract]      
Concentration risk, percentage 10.00%    
Concentration risk, number of significant concentrations | concentration 0    
Master Pension Trust [Member]      
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 42,800 $ 37,500  
[1] Target allocations for equity securities are broken out as follows: 45.5% United States equity and 17.5% non-United States equity.