Employee Benefit Plans and Other Postretirement Benefits - Components Of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension and SERPA Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 24,570	$ 27,224	$ 25,408
Interest cost	61,988	76,447	85,483
Expected return on plan assets	(131,494)	(135,056)	(142,323)
Prior service credit	(1,247)	(1,088)	(1,930)
Net loss	67,933	65,489	44,511
Special early retirement benefits	0	0	1,583
Curtailment (gain) loss	(10,562)	74	0
Settlement loss	722	2,742	1,503
Net periodic benefit cost	11,910	35,832	14,235
Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Service cost	5,147	11,761	4,449
Interest cost	6,505	9,391	11,753
Expected return on plan assets	(13,978)	(13,870)	(14,030)
Prior service credit	(2,323)	(2,381)	(2,381)
Net loss	1,056	492	277
Special early retirement benefits	0	0	0
Curtailment (gain) loss	0	(392)	(960)
Settlement loss	0	0	0
Net periodic benefit cost	$ (3,593)	$ 5,001	$ (892)