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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 856 $ 599 $ 2,567 $ 1,795
Expected return on plan assets (878) (1,098) (2,632) (3,295)
Net amortization and deferral 81 163 242 490
Net periodic benefit 59 (336) 177 (1,010)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 12 8 38 25
Net accretion and deferral (137) (132) (409) (394)
Net periodic benefit $ (125) $ (124) $ (371) $ (369)