Benefit Plans - Change in Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
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	$ 250,674	$ 391,555
Actual Return on Plan Assets	28,981	(91,303)
Company Contributions	384	6,414
Plan Participants' Contributions	0	0
Benefit Payments from Fund	(13,549)	(13,165)
Benefit and Settlement Payments Paid Directly by Company	(384)	(114)
Settlement Payments from Fund	(30,494)	(42,713)
Other Adjustment	0	0
Fair Value of Plan Assets at End of Year	235,612	250,674
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	111,154	140,839
Actual Return on Plan Assets	26,703	(28,088)
Company Contributions	0	0
Plan Participants' Contributions	311	463
Benefit Payments from Fund	(3,439)	(1,504)
Benefit and Settlement Payments Paid Directly by Company	0	0
Settlement Payments from Fund	0	0
Other Adjustment	(358)	(556)
Fair Value of Plan Assets at End of Year	$ 134,371	$ 111,154