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Summary of Significant Accounting Policies - Other Expense (Income) - Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Interest income	$ (1,957)	$ (1,943)	$ (1,952)
Interest on regulatory deferrals	(1,914)	(1,206)	(1,222)
Equity-related AFUDC	(6,704)	(7,004)	(6,970)
Non-service portion of pension and other postretirement benefit expenses	(3,037)	1,386	6,433
Net (income) loss on investments	(48,492)	(21,402)	(905)
Other income	(613)	(3,129)	(201)
Total	$ (62,717)	$ (33,298)	$ (4,817)

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Interest On Regulatory Deferrals

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Amount of realized and unrealized gain (loss) on investment.

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