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Employee Benefit Plans Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 3,269 $ 2,393 $ 2,244
Expected return on assets (3,436) (4,393) (4,044)
Net amortization and deferral 631 653 2,017
Net periodic benefit cost 464 (1,347) 217
Other Postretirement Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost 42 34 32
Net amortization and deferral (558) (525) (536)
Net periodic benefit cost $ (516) $ (491) $ (504)