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Employee Benefit Plans Summary of Pension Plan and Postretirement Plan Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 598 $ 561
Expected return on plan assets (1,098) (1,011)
Net amortization and deferral 163 504
Net periodic benefit (337) 54
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 8 8
Net accretion and deferral (131) (134)
Net periodic benefit $ (123) $ (126)