Employee and Retiree Benefit Plans - Components of Net Periodic Benefit Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,542	$ 7,875	$ 8,199
Interest cost	34,140	22,747	14,784
Expected return on plan assets	(32,839)	(36,458)	(19,222)
Amortization of prior service cost (credit)	620	(684)	591
Recognized actuarial (gain) loss	9,776	16,098	20,565
Net periodic benefit expense	18,239	9,578	24,917
Curtailment expense	219	0	0
Total net periodic benefit expense	18,458	9,578	24,917
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	495	968	1,295
Interest cost	3,241	2,211	2,071
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(532)	(532)	0
Recognized actuarial (gain) loss	(3,512)	(615)	(29)
Net periodic benefit expense	(308)	2,032	3,337
Curtailment expense	0	0	0
Total net periodic benefit expense	$ (308)	$ 2,032	$ 3,337