Components of Pension and Other Post-employment Benefit (OPEB) Plans Net Periodic Benefit Costs - Components of Net Periodic Benefit (Credit) Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits
Defined Contribution Plan Disclosure [Line Items]
Service Cost	$ 304	$ 301	$ 913	$ 905
Interest Cost	6,756	4,135	20,270	12,404
Expected Return on Plan Assets	(9,867)	(9,319)	(29,602)	(27,957)
Amortization of Prior Service Credits	0	0	0	0
Amortization of Actuarial Loss	185	759	555	2,278
Net Periodic Benefit (Credit) Cost	(2,622)	(4,124)	(7,864)	(12,370)
Other Post-Employment Benefits
Defined Contribution Plan Disclosure [Line Items]
Service Cost	0	0	0	0
Interest Cost	3,261	1,975	9,783	5,924
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service Credits	(601)	(601)	(1,804)	(1,804)
Amortization of Actuarial Loss	0	878	0	2,636
Net Periodic Benefit (Credit) Cost	$ 2,660	$ 2,252	$ 7,979	$ 6,756