Benefit Plans - Components of Net Periodic Postretirement Benefit Cost (Details) - Postretirement Benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,085	$ 1,458	$ 1,516
Interest cost	2,761	1,923	1,772
Recognized net actuarial loss	0	444	682
Net periodic pension/postretirement benefit cost	$ 3,846	$ 3,825	$ 3,970