Employee and Retiree Benefit Plans - Effects of Fair Value Measurements Using Significant Unobservable Inputs on Changes in Level 3 Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	$ 450,944
Ending balance	477,809	$ 450,944
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	32,734
Ending balance	24,454	32,734
Hedged Funds and Other Alternative Strategies | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	32,734	82,854
Relating to assets held at the reporting date	711	(38,389)
Purchases, sales and settlements	(8,991)	(11,731)
Ending balance	$ 24,454	$ 32,734