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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 598 $ 561 $ 1,196 $ 1,122
Expected return on plan assets (1,099) (1,011) (2,197) (2,022)
Net amortization and deferral 164 504 327 1,008
Net periodic benefit (337) 54 (674) 108
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 9 8 17 16
Net accretion and deferral (131) (134) (262) (268)
Net periodic benefit $ (122) $ (126) $ (245) $ (252)