Employee Benefit Plans and Other Postretirement Benefits - Schedule Of Obligation And Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in plan assets:
Pension and postretirement assets	$ 320,133	$ 386,152
Pension and SERPA Benefits
Change in benefit obligation:
Benefit obligation, beginning of period	2,174,595	2,390,435
Service cost	19,052	24,570	$ 27,224
Interest cost	61,890	61,988	76,447
Actuarial gains	(561,142)	(92,157)
Plan participant contributions	0	0
Benefits paid	(137,645)	(138,043)
Net curtailments and settlements	(2,838)	(72,198)
Benefit obligation, end of period	1,553,912	2,174,595	2,390,435
Change in plan assets:
Fair value of plan assets, beginning of period	2,486,467	2,433,975
Return on plan assets	(539,800)	189,974
Plan participant contributions	0	0
Benefits paid	(137,124)	(137,482)
Fair value of plan assets, end of period	1,809,543	2,486,467	2,433,975
Funded status of the plan	255,631	311,872
Pension and postretirement assets	268,317	332,586
Accrued liabilities	(1,331)	(1,976)
Pension and postretirement liabilities	(11,355)	(18,738)
Total benefits included in balance sheet	255,631	311,872
Prior service credits	3,461	2,457
Actuarial losses (gains)	289,340	232,622
Amounts included in other comprehensive income, net of tax	292,801	235,079
Postretirement Healthcare Benefits
Change in benefit obligation:
Benefit obligation, beginning of period	286,301	315,245
Service cost	4,642	5,147	11,761
Interest cost	7,617	6,505	9,391
Actuarial gains	(67,903)	(24,190)
Plan participant contributions	2,029	2,337
Benefits paid	(16,657)	(18,743)
Net curtailments and settlements	(5,218)	0
Benefit obligation, end of period	210,811	286,301	315,245
Change in plan assets:
Fair value of plan assets, beginning of period	262,945	244,035
Return on plan assets	(48,257)	30,504
Plan participant contributions	2,029	2,337
Benefits paid	(10,914)	(13,931)
Fair value of plan assets, end of period	205,803	262,945	$ 244,035
Funded status of the plan	(5,008)	(23,356)
Pension and postretirement assets	51,816	53,566
Accrued liabilities	(224)	(361)
Pension and postretirement liabilities	(56,600)	(76,561)
Total benefits included in balance sheet	(5,008)	(23,356)
Prior service credits	(1,884)	(3,661)
Actuarial losses (gains)	(39,699)	(36,905)
Amounts included in other comprehensive income, net of tax	$ (41,583)	$ (40,566)