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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Pension Plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 1,260 $ 1,352 $ 3,779 $ 4,058
Interest cost 2,328 3,356 6,984 10,069
Expected return on plan assets (5,219) (5,647) (15,657) (16,943)
Net loss (gain) 1,828 2,093 5,486 6,279
Net periodic benefit cost 197 1,154 592 3,463
Payment for Pension and Other Postretirement Benefits [Abstract]        
Contributions by Employer     0  
Estimated Future Employer Contributions in Current Fiscal Year 0   0  
Estimated Future Employer Contributions in Next Fiscal Year 3,900   3,900  
Other Postretirement Benefits Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 560 514 1,678 1,542
Interest cost 264 412 793 1,237
Expected return on plan assets (34) (46) (102) (137)
Prior service cost (benefit) (108) (136) (326) (410)
Net loss (gain) 116 5 350 15
Net periodic benefit cost 798 749 2,393 2,247
Payment for Pension and Other Postretirement Benefits [Abstract]        
Contributions by Employer     4,145  
Estimated Future Employer Contributions in Current Fiscal Year 1,382   1,382  
Estimated Future Employer Contributions in Next Fiscal Year 5,202   5,202  
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 235 1,035 1,948 1,482
Interest cost 176 274 530 824
Prior service cost (benefit) 0 1 0 1
Net loss (gain) 439 425 1,316 1,277
Net periodic benefit cost 850 $ 1,735 3,794 $ 3,584
Payment for Pension and Other Postretirement Benefits [Abstract]        
Contributions by Employer     1,445  
Estimated Future Employer Contributions in Current Fiscal Year 482   482  
Estimated Future Employer Contributions in Next Fiscal Year $ 2,149   $ 2,149