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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands		9 Months Ended
	Oct. 14, 2020	Sep. 30, 2020	Dec. 31, 2019
Regulatory Assets and Liabilities
Total Regulatory Assets		$ 484,435	$ 433,322
Total Regulatory Liabilities		193,939	211,413
Short-term portion of the regulatory assets		54,415	38,225
Short-term portion of the regulatory liabilities		11,003	4,462
Property-related temporary differences (tax benefits flowed through to customers)
Regulatory Assets and Liabilities
Total Regulatory Liabilities		173,048	194,501
HCBA
Regulatory Assets and Liabilities
Total Regulatory Liabilities		7,407	4,271
CEBA
Regulatory Assets and Liabilities
Total Regulatory Liabilities		2,926	2,742
Net WRAM and MCBA long-term payable
Regulatory Assets and Liabilities
Total Regulatory Liabilities		374	211
Tax accounting memorandum account
Regulatory Assets and Liabilities
Total Regulatory Liabilities		711	806
Cost of capital memorandum account
Regulatory Assets and Liabilities
Total Regulatory Liabilities		15	151
1,2,3 trichloropropane (TCP) settlement proceeds
Regulatory Assets and Liabilities
Total Regulatory Liabilities		9,084	8,426
Other regulatory liabilities
Regulatory Assets and Liabilities
Total Regulatory Liabilities		374	305
Pension and retiree group health
Regulatory Assets and Liabilities
Total Regulatory Assets		207,828	208,321
Property-related temporary differences (tax benefits flowed through to customers)
Regulatory Assets and Liabilities
Total Regulatory Assets		107,962	104,931
Other accrued benefits
Regulatory Assets and Liabilities
Total Regulatory Assets		21,434	20,030
Net WRAM and MCBA long-term accounts receivable
Regulatory Assets and Liabilities
Total Regulatory Assets		40,036	25,465
Asset retirement obligations, net
Regulatory Assets and Liabilities
Total Regulatory Assets		$ 21,018	19,567
Interim rates long-term accounts receivable
Regulatory Assets and Liabilities
Recovery Period		1 year
Total Regulatory Assets		$ 21,672	4,642
Tank coating
Regulatory Assets and Liabilities
Recovery Period		10 years
Total Regulatory Assets		$ 14,209	13,535
Recoverable property losses
Regulatory Assets and Liabilities
Recovery Period		10 years
Total Regulatory Assets		$ 4,775	5,000
PCBA
Regulatory Assets and Liabilities
Recovery Period		1 year
Total Regulatory Assets		$ 32,819	21,465
Other components of net periodic benefit cost
Regulatory Assets and Liabilities
Total Regulatory Assets		6,316	5,145
Other regulatory assets
Regulatory Assets and Liabilities
Total Regulatory Assets		$ 6,366	$ 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
2020 - 2021 | Subsequent Event
Regulatory Assets and Liabilities
Investments in Capital Improvements	$ 828,000
Revenue requirement threshold	698,700
2020 - 2021 | Subsequent Event | Water System Infrastructure
Regulatory Assets and Liabilities
Investments in Capital Improvements	$ 148,000

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