Benefit Plans - Components of Net Periodic Benefit Costs (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 Disclosure [Line Items]
Company Service Cost	$ 7,153	$ 7,569	$ 7,342
Interest Cost	12,461	11,276	13,036
Expected Return on Assets	(18,064)	(20,657)	(22,139)
Amortization of Net Transition Obligation/(Asset)	0	0	0
Amortization of Net Prior Service Cost/(Credit)	(163)	(239)	(247)
Amortization of Net Losses/(Gains)	5,726	5,490	6,578
Cost of Settlements and Curtailments	13,801	6,012	10,369
Net Periodic Benefit Cost	20,914	9,451	14,939
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Company Service Cost	1,307	1,508	1,263
Interest Cost	694	648	832
Expected Return on Assets	(10,502)	(8,863)	(7,407)
Amortization of Net Transition Obligation/(Asset)	0	0	0
Amortization of Net Prior Service Cost/(Credit)	489	213	51
Amortization of Net Losses/(Gains)	(3,103)	(1,697)	(783)
Cost of Settlements and Curtailments	0	0	0
Net Periodic Benefit Cost	$ (11,115)	$ (8,191)	$ (6,044)