Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2020
Changes in allowance for doubtful accounts
Balance at beginning of year	$ 1,662	$ 916
Increase to provision	871	1,937
Provision for Doubtful Accounts transfer to BVESI	0	0
Accounts written off, net of recoveries	(80)	(400)
Balance at end of year	2,453	2,453
Components of allowance for doubtful accounts
Allowance for doubtful accounts related to accounts receivable-customer			$ 2,400
Allowance for doubtful accounts related to other accounts receivable			53
Total allowance for doubtful accounts	2,453	2,453	2,453
GOLDEN STATE WATER COMPANY
Changes in allowance for doubtful accounts
Balance at beginning of year	1,662	916
Increase to provision	801	1,867
Provision for Doubtful Accounts transfer to BVESI	(79)	(79)
Accounts written off, net of recoveries	(67)	(387)
Balance at end of year	2,317	2,317
Components of allowance for doubtful accounts
Allowance for doubtful accounts related to accounts receivable-customer			2,264
Allowance for doubtful accounts related to other accounts receivable			53
Total allowance for doubtful accounts	$ 2,317	$ 2,317	$ 2,317