Benefit Plans - Change in Project Benefit/Accumulated Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension and Supplemental Executive Retirement Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	$ 391,698	$ 423,713
Company Service Cost	7,153	7,569	$ 7,342
Interest Cost	12,461	11,276	13,036
Plan Participants' Contributions	0	0
Net Actuarial (Gain)/Loss	(83,240)	(10,018)
Benefit Payments from Fund	(13,165)	(12,866)
Benefit Payments Paid Directly by Company	(114)	(362)
Plan Amendments	3,247	2
Curtailments	(352)	0
Settlement Payments from Fund (1)	(42,713)	(27,616)
Other Adjustment	0	0
Benefit Obligation at End of Year	274,975	391,698	423,713
Other Postretirement Benefit Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	25,635	28,714
Company Service Cost	1,307	1,508	1,263
Interest Cost	694	648	832
Plan Participants' Contributions	463	456
Net Actuarial (Gain)/Loss	(8,123)	(3,574)
Benefit Payments from Fund	(1,504)	(1,963)
Benefit Payments Paid Directly by Company	0	0
Plan Amendments	11,278	0
Curtailments	0	0
Settlement Payments from Fund (1)	0	0
Other Adjustment	(170)	(154)
Benefit Obligation at End of Year	$ 29,580	$ 25,635	$ 28,714