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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 366,921	$ 353,569
Total Regulatory Liabilities	204,138	211,275
Short-term portion of the regulatory assets	37,130	42,394
Short-term portion of the regulatory liabilities	19,984	12,213
Property-related temporary differences (tax benefits flowed through to customers)
Regulatory Assets and Liabilities
Total Regulatory Liabilities	180,175	180,205
Health care balancing account
Regulatory Assets and Liabilities
Total Regulatory Liabilities	3,547	3,516
Conservation program
Regulatory Assets and Liabilities
Total Regulatory Liabilities	6,931	6,880
Net WRAM and MCBA long-term payable
Regulatory Assets and Liabilities
Total Regulatory Liabilities	409	222
Tax accounting memorandum account
Regulatory Assets and Liabilities
Total Regulatory Liabilities	646	5,039
Cost of capital memorandum account
Regulatory Assets and Liabilities
Total Regulatory Liabilities	127	2,834
1,2,3 trichloropropane settlement proceeds
Regulatory Assets and Liabilities
Total Regulatory Liabilities	12,091	12,142
Other regulatory liabilities
Regulatory Assets and Liabilities
Total Regulatory Liabilities	212	437
Pension and retiree group health
Regulatory Assets and Liabilities
Total Regulatory Assets	156,782	156,947
Property-related temporary differences (tax benefits flowed through to customers)
Regulatory Assets and Liabilities
Total Regulatory Assets	99,971	99,376
Other accrued benefits
Regulatory Assets and Liabilities
Total Regulatory Assets	26,453	25,717
Net WRAM and MCBA long-term accounts receivable
Regulatory Assets and Liabilities
Total Regulatory Assets	27,180	17,134
Asset retirement obligations, net
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 18,666	18,197
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	$ 11,845	11,196
Health care balancing account
Regulatory Assets and Liabilities
Recovery Period	1 year
Total Regulatory Assets	$ 442	442
Pension balancing account
Regulatory Assets and Liabilities
Recovery Period	1 year
Total Regulatory Assets	$ 17,306	16,494
Other components of net periodic benefit cost
Regulatory Assets and Liabilities
Total Regulatory Assets	3,560	3,221
Other regulatory assets
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 74	$ 203
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

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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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