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Summary of Significant Accounting Policies - Other Expense (Income) - Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Interest income	$ (1,943)	$ (1,952)	$ (2,587)
Interest on regulatory deferrals	(1,206)	(1,222)	(1,460)
Equity-related AFUDC	(7,004)	(6,970)	(6,585)
Non-service portion of pension and other postretirement benefit expenses	1,386	6,433	8,899
Net (income) loss on investments	(21,402)	(905)	(14,299)
Other expense (income)	(3,129)	(201)	1,104
Total	$ (33,298)	$ (4,817)	$ (14,928)

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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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