Benefit Plans - Development of Funded Status (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension and Supplemental Executive Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 274,975	$ 390,747
Projected Benefit Obligation	(274,975)	(391,698)	$ (423,713)
Plan Assets at Fair Value	250,674	391,555	411,245
Funded Status - Overfunded/(Underfunded)	(24,301)	(143)
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	29,580	25,635
Projected Benefit Obligation	(29,580)	(25,635)	(28,714)
Plan Assets at Fair Value	111,154	140,839	$ 119,024
Funded Status - Overfunded/(Underfunded)	$ 81,574	$ 115,204