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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Pension Plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 1,260 $ 1,353 $ 2,519 $ 2,706
Interest cost 2,328 3,356 4,656 6,713
Expected return on plan assets (5,219) (5,648) (10,438) (11,296)
Net loss (gain) 1,829 2,093 3,658 4,186
Net periodic benefit cost 198 1,154 395 2,309
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 3,788   3,788  
Other Postretirement Benefits Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 559 514 1,118 1,028
Interest cost 264 413 529 825
Expected return on plan assets (34) (46) (68) (91)
Prior service cost (benefit) (109) (137) (218) (274)
Net loss (gain) 117 5 234 10
Net periodic benefit cost 797 749 1,595 1,498
Payment for Pension and Other Postretirement Benefits [Abstract]        
Contributions by Employer     2,763  
Estimated Future Employer Contributions in Current Fiscal Year 2,763   2,763  
Estimated Future Employer Contributions in Next Fiscal Year 5,241   5,241  
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 1,020 1,817 1,713 447
Interest cost 177 275 354 550
Net loss (gain) 438 426 877 852
Net periodic benefit cost 1,635 $ 2,518 2,944 $ 1,849
Payment for Pension and Other Postretirement Benefits [Abstract]        
Contributions by Employer     964  
Estimated Future Employer Contributions in Current Fiscal Year 964   964  
Estimated Future Employer Contributions in Next Fiscal Year $ 1,967   $ 1,967