Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2020
Changes in allowance for doubtful accounts
Balance at beginning of year	$ 1,145	$ 916
Increase to provision	673	1,066
Accounts written off, net of recoveries	(156)	(320)
Balance at end of year	1,662	1,662
Components of allowance for doubtful accounts
Allowance for doubtful accounts related to accounts receivable-customer			$ 1,603
Allowance for doubtful accounts related to receivable from U.S. government			0
Allowance for doubtful accounts related to other accounts receivable			59
Total allowance for doubtful accounts	1,662	1,662	1,662
GOLDEN STATE WATER COMPANY
Changes in allowance for doubtful accounts
Balance at beginning of year	1,145	916
Increase to provision	673	1,066
Accounts written off, net of recoveries	(156)	(320)
Balance at end of year	1,662	1,662
Components of allowance for doubtful accounts
Allowance for doubtful accounts related to accounts receivable-customer			1,603
Allowance for doubtful accounts related to receivable from U.S. government			0
Allowance for doubtful accounts related to other accounts receivable			59
Total allowance for doubtful accounts	$ 1,662	$ 1,662	$ 1,662