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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 855 $ 598 $ 1,711 $ 1,196
Expected return on plan assets (877) (1,099) (1,754) (2,197)
Net amortization and deferral 80 164 161 327
Net periodic benefit 58 (337) 118 (674)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 13 9 26 17
Net accretion and deferral (136) (131) (272) (262)
Net periodic benefit $ (123) $ (122) $ (246) $ (245)