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Employee Benefits - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits      
Net periodic benefit cost for pension plans and the postretirement benefit plan      
Service Cost $ 0 $ 0 $ 0
Interest Cost 2,924 3,627 4,401
Expected Return on Plan Assets (4,592) (5,028) (4,993)
Amortization of Prior Service Credit 0 0 0
Amortization of Net Actuarial Losses (Gains) 2,676 2,318 1,937
Net Periodic Benefit Cost 1,008 917 1,345
Postretirement Benefits      
Net periodic benefit cost for pension plans and the postretirement benefit plan      
Service Cost 678 578 455
Interest Cost 816 945 1,025
Expected Return on Plan Assets 0 0 0
Amortization of Prior Service Credit (246) (246) (288)
Amortization of Net Actuarial Losses (Gains) 0 0 (339)
Net Periodic Benefit Cost $ 1,248 $ 1,277 $ 853