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Benefit Plans - Additional Disclosures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Postretirement Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Company Contributions $ 0 $ 0
Current plus 1 0  
Actual Benefit Payments for the Year Ending: Current 1,975  
Expected Benefit Payments for the Year Ending: Current plus 1 1,765  
Expected Benefit Payments for the Year Ending: Current plus 2 1,995  
Expected Benefit Payments for the Year Ending: Current plus 3 2,157  
Expected Benefit Payments for the Year Ending: Current plus 4 2,241  
Expected Benefit Payments for the Year Ending: Current plus 5 2,357  
Expected Benefit Payments for the Year Ending: Current plus 6 - 10 $ 10,916  
Other Postretirement Benefit Plan | Equity securities | Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Target asset allocations (in hundredths) 70.00%  
Other Postretirement Benefit Plan | Equity securities | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Target asset allocations (in hundredths) 100.00%  
Other Postretirement Benefit Plan | Real Estate | Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Target asset allocations (in hundredths) 0.00%  
Other Postretirement Benefit Plan | Real Estate | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Target asset allocations (in hundredths) 15.00%  
Other Postretirement Benefit Plan | Commodities | Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Target asset allocations (in hundredths) 0.00%  
Other Postretirement Benefit Plan | Commodities | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Target asset allocations (in hundredths) 10.00%  
Other Postretirement Benefit Plan | Fixed Income/Cash | Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Target asset allocations (in hundredths) 0.00%  
Other Postretirement Benefit Plan | Fixed Income/Cash | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Target asset allocations (in hundredths) 10.00%  
Pension and Supplemental Executive Retirement Plans    
Defined Benefit Plan Disclosure [Line Items]    
Company Contributions $ 12,453 $ 10,205
Current plus 1 6,200  
Actual Benefit Payments for the Year Ending: Current 46,213  
Expected Benefit Payments for the Year Ending: Current plus 1 30,082  
Expected Benefit Payments for the Year Ending: Current plus 2 29,929  
Expected Benefit Payments for the Year Ending: Current plus 3 30,076  
Expected Benefit Payments for the Year Ending: Current plus 4 29,567  
Expected Benefit Payments for the Year Ending: Current plus 5 28,852  
Expected Benefit Payments for the Year Ending: Current plus 6 - 10 $ 135,830