Employee and Retiree Benefit Plans (Components of Net Periodic Benefit Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,129	$ 1,770	$ 6,387	$ 5,306
Interest cost	5,163	4,258	15,545	12,844
Expected return on plan assets	(7,999)	(6,038)	(24,091)	(18,326)
Amortization of prior service cost (credit)	582	155	1,761	467
Recognized actuarial loss (gain)	3,822	5,269	11,466	15,829
Net periodic benefit expense	3,697	5,414	11,068	16,120
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	292	328	876	981
Interest cost	574	521	1,722	1,563
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	(133)	0	(399)	0
Recognized actuarial loss (gain)	(77)	(8)	(232)	(23)
Net periodic benefit expense	$ 656	$ 841	$ 1,967	$ 2,521