Benefit Plans - Change in Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Pension and Supplemental Executive Retirement Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	$ 391,555	$ 411,245
Actual Return on Assets	(91,303)	13,992
Company Contributions	6,414	7,162
Plan Participants' Contributions	0	0
Benefit Payments from Fund	(13,165)	(12,866)
Benefit Payments Paid Directly by Company	(114)	(362)
Settlement Payments from Fund	(42,713)	(27,616)
Other Adjustment	0	0
Fair Value of Plan Assets at End of Year	250,674	391,555
Other Postretirement Benefit Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	140,839	119,024
Actual Return on Assets	(28,088)	23,773
Company Contributions	0	0
Plan Participants' Contributions	463	456
Benefit Payments from Fund	(1,504)	(1,963)
Benefit Payments Paid Directly by Company	0	0
Settlement Payments from Fund	0	0
Other Adjustment	(556)	(451)
Fair Value of Plan Assets at End of Year	$ 111,154	$ 140,839