Employee and Retiree Benefit Plans - Components of Net Periodic Benefit Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8,199	$ 7,967	$ 7,964
Interest cost	14,784	21,127	27,835
Expected return on plan assets	(19,222)	(24,316)	(25,719)
Amortization of prior service cost (credit)	591	640	964
Recognized actuarial (gain) loss	20,565	22,828	14,106
Net periodic benefit expense	24,917	28,246	25,150
Termination benefits expense	0	8,434	0
Curtailment expense	0	586	0
Total net periodic benefit expense	24,917	37,266	25,150
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,295	1,373	1,559
Interest cost	2,071	2,626	3,864
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	0	0	0
Recognized actuarial (gain) loss	(29)	(31)	(193)
Net periodic benefit expense	3,337	3,968	5,230
Termination benefits expense	0	0	0
Curtailment expense	0	(1,825)	0
Total net periodic benefit expense	$ 3,337	$ 2,143	$ 5,230