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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	19 Months Ended
	Mar. 31, 2020	Dec. 31, 2021	Apr. 01, 2020	Dec. 31, 2019
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 442,819			$ 433,322
Total Regulatory Liabilities	210,267			211,413
Short-term portion of the regulatory assets	24,970			38,225
Short-term portion of the regulatory liabilities	3,474			4,462
Property-related temporary differences (tax benefits flowed through to customers)
Regulatory Assets and Liabilities
Total Regulatory Liabilities	194,459			194,501
HCBA
Regulatory Assets and Liabilities
Total Regulatory Liabilities	4,271			4,271
CEBA
Regulatory Assets and Liabilities
Total Regulatory Liabilities	559			2,742
Net WRAM and MCBA long-term payable
Regulatory Assets and Liabilities
Total Regulatory Liabilities	135			211
Tax accounting memorandum account
Regulatory Assets and Liabilities
Total Regulatory Liabilities	853			806
Cost of capital memorandum account
Regulatory Assets and Liabilities
Total Regulatory Liabilities	154			151
1,2,3 trichloropropane (TCP) settlement proceeds
Regulatory Assets and Liabilities
Total Regulatory Liabilities	9,491			8,426
Other regulatory liabilities
Regulatory Assets and Liabilities
Total Regulatory Liabilities	345			305
Pension and retiree group health
Regulatory Assets and Liabilities
Total Regulatory Assets	208,157			208,321
Property-related temporary differences (tax benefits flowed through to customers)
Regulatory Assets and Liabilities
Total Regulatory Assets	105,600			104,931
Other accrued benefits
Regulatory Assets and Liabilities
Total Regulatory Assets	20,885			20,030
Net WRAM and MCBA long-term accounts receivable
Regulatory Assets and Liabilities
Total Regulatory Assets	31,693			25,465
Asset retirement obligations, net
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 20,045			19,567
Interim rates long-term accounts receivable
Regulatory Assets and Liabilities
Recovery Period	1 year
Total Regulatory Assets	$ 4,642			4,642
Tank coating
Regulatory Assets and Liabilities
Recovery Period	10 years
Total Regulatory Assets	$ 14,426			13,535
Recoverable property losses
Regulatory Assets and Liabilities
Recovery Period	10 years
Total Regulatory Assets	$ 4,856			5,000
PCBA
Regulatory Assets and Liabilities
Recovery Period	1 year
Total Regulatory Assets	$ 21,465			21,465
Other components of net periodic benefit cost
Regulatory Assets and Liabilities
Total Regulatory Assets	5,503			5,145
Other regulatory assets
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 5,547			$ 5,221
Minimum | Net WRAM and MCBA long-term accounts receivable
Regulatory Assets and Liabilities
Recovery Period	1 year
Maximum | Net WRAM and MCBA long-term accounts receivable
Regulatory Assets and Liabilities
Recovery Period	2 years
Forecast
Regulatory Assets and Liabilities
Amount of construction work in process included in rate base		$ 148,000
Forecast | 2019-2021 | Minimum
Regulatory Assets and Liabilities
Amount of construction work in process included in rate base			$ 609,000
Payments for Capital Improvements		809,000
Forecast | 2019-2021 | Maximum
Regulatory Assets and Liabilities
Amount of construction work in process included in rate base			628,000
Payments for Capital Improvements		$ 828,000
Forecast | 2018
Regulatory Assets and Liabilities
Amount of construction work in process included in rate base			$ 200,000

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The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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