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Benefit Plans - Reconciliation of Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Change in plan assets      
Fair value of assets at beginning of year $ 331,943    
Fair value of plan assets at end of year 269,912 $ 331,943  
Pension Benefits      
Change in benefit obligation      
Benefit obligation at beginning of year 383,838 386,091  
Service cost 9,359 9,730 $ 8,659
Interest cost 10,708 9,415 10,484
Actuarial (gain)/loss (94,793) (5,477)  
Implicit rate subsidy 0 0  
Plan participants contributions 0 0  
Administrative expenses paid (136) (144)  
Benefits paid and settlements (19,853) (15,777)  
Benefit obligation at end of year 289,123 383,838 386,091
Change in plan assets      
Fair value of assets at beginning of year 310,176 278,124  
Actual return on plan assets (49,939) 34,826  
Employer contributions 11,712 13,147  
Plan participants contributions 0 0  
Administrative expenses paid (136) (144)  
Benefits paid and settlements (19,853) (15,777)  
Fair value of plan assets at end of year 251,960 310,176 278,124
Funded status at end of year (37,163) (73,662)  
Other Benefits      
Change in benefit obligation      
Benefit obligation at beginning of year 34,412 35,794  
Service cost 1,032 1,115 900
Interest cost 883 806 956
Actuarial (gain)/loss (9,360) (2,235)  
Implicit rate subsidy (236) (222)  
Plan participants contributions 207 171  
Administrative expenses paid 0 0  
Benefits paid and settlements (1,108) (1,017)  
Benefit obligation at end of year 25,830 34,412 35,794
Change in plan assets      
Fair value of assets at beginning of year 21,767 19,479  
Actual return on plan assets (3,606) 2,460  
Employer contributions 626 669  
Plan participants contributions 207 171  
Administrative expenses paid (65) (63)  
Benefits paid and settlements (977) (949)  
Fair value of plan assets at end of year 17,952 21,767 $ 19,479
Funded status at end of year $ (7,878) $ (12,645)