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General - Real Estate Investments and Nonutility Properties (Details) $ in Thousands				3 Months Ended		6 Months Ended
	Feb. 15, 2022 USD ($)	Oct. 29, 2021 USD ($) property	Jun. 29, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Land				$ 12,900		$ 12,900		$ 12,615
Buildings and improvements				45,334		45,334		45,017
Subtotal				58,234		58,234		57,632
Less accumulated depreciation and amortization				16,553		16,553		15,951
Real estate investment property, total				41,681		41,681		$ 41,681
Schedule of Investments [Line Items]
Gain on sale of real estate investments			$ 3,000	$ 0	$ 3,000	$ 0	$ 3,000
Sales agreement, holdback amount									$ 3,000
Property Two
Schedule of Investments [Line Items]
Gain on sale of real estate investments	$ 5,442
San Jose Water Company
Schedule of Investments [Line Items]
Number of properties sold | property		2
Proceeds from sale of real estate held-for-investment		$ 13,150
San Jose Water Company | Property One
Schedule of Investments [Line Items]
Gain on sale of real estate investments		7,230
Properties selling expenses		277
San Jose Water Company | Property Two
Schedule of Investments [Line Items]
Properties selling expenses		178
Deferred gain on sale of properties		$ 5,442

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Deferred Gains (Losses) on Sales of Properties

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Number Of Properties Sold

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Properties Selling Expenses

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Sales Agreement, Holdback Amount

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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