Employee Benefit Plans and Other Postretirement Benefits - Components Of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension and SERPA Benefits
Defined Benefit Plan Disclosure
Service cost	$ 19,052	$ 24,570	$ 27,224
Interest cost	61,890	61,988	76,447
Expected return on plan assets	(125,904)	(131,494)	(135,056)
Prior service credit	(1,312)	(1,247)	(1,088)
Net loss	31,912	67,933	65,489
Special early retirement benefits	0	0	0
Curtailment (gain) loss	0	(10,562)	74
Settlement (gain) loss	(1,471)	722	2,742
Net periodic benefit cost	(15,833)	11,910	35,832
Postretirement Healthcare Benefits
Defined Benefit Plan Disclosure
Service cost	4,642	5,147	11,761
Interest cost	7,617	6,505	9,391
Expected return on plan assets	(15,237)	(13,978)	(13,870)
Prior service credit	(2,323)	(2,323)	(2,381)
Net loss	488	1,056	492
Special early retirement benefits	0	0	0
Curtailment (gain) loss	0	0	(392)
Settlement (gain) loss	(1,244)	0	0
Net periodic benefit cost	$ (6,057)	$ (3,593)	$ 5,001