Employee and Retiree Benefit Plans - Components of Net Periodic Benefit Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,650	$ 2,129
Interest cost	8,507	5,243
Expected return on plan assets	(8,194)	(8,138)
Amortization of prior service cost (credit)	155	600
Recognized actuarial loss (gain)	2,401	3,822
Net periodic benefit expense	4,519	3,656
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	132	292
Interest cost	874	574
Expected return on plan assets	0	0
Amortization of prior service cost (credit)	(133)	(133)
Recognized actuarial loss (gain)	(781)	(77)
Net periodic benefit expense	$ 92	$ 656