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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, 2023
Mar. 31, 2022
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 856 $ 598
Expected return on plan assets (877) (1,098)
Net amortization and deferral 80 163
Net periodic benefit 59 (337)
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 13 8
Net accretion and deferral (136) (131)
Net periodic benefit $ (123) $ (123)