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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Pension Plans    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Defined Benefit Plan, Service Cost $ 982 $ 1,259
Interest cost 2,705 2,328
Expected return on plan assets (4,631) (5,219)
Prior service cost (benefit) (17) 0
Net loss (gain) 1,523 1,829
Net periodic benefit cost 562 197
Payment for Pension and Other Postretirement Benefits [Abstract]    
Contributions by Employer 0  
Estimated Future Employer Contributions in Current Fiscal Year 3,900  
Estimated Future Employer Contributions in Next Fiscal Year 3,200  
Other Postretirement Benefits Plan    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Defined Benefit Plan, Service Cost 492 559
Interest cost 321 265
Expected return on plan assets (31) (34)
Prior service cost (benefit) (72) (109)
Net loss (gain) 16 117
Net periodic benefit cost 726 798
Payment for Pension and Other Postretirement Benefits [Abstract]    
Contributions by Employer 1,276  
Estimated Future Employer Contributions in Current Fiscal Year 3,828  
Estimated Future Employer Contributions in Next Fiscal Year 4,761  
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Defined Benefit Plan, Service Cost (392) 693
Interest cost 208 177
Net loss (gain) 69 439
Net periodic benefit cost (115) $ 1,309
Payment for Pension and Other Postretirement Benefits [Abstract]    
Contributions by Employer 539  
Estimated Future Employer Contributions in Current Fiscal Year 1,617  
Estimated Future Employer Contributions in Next Fiscal Year $ 2,215