Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Changes in allowance for doubtful accounts
Balance at beginning of year	$ 916
Increase to provision	393
Accounts written off, net of recoveries	(164)
Balance at end of year	1,145
Components of allowance for doubtful accounts
Allowance for doubtful accounts related to accounts receivable-customer		$ 1,086
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	1,145	1,145
GOLDEN STATE WATER COMPANY
Changes in allowance for doubtful accounts
Balance at beginning of year	916
Increase to provision	393
Accounts written off, net of recoveries	(164)
Balance at end of year	1,145
Components of allowance for doubtful accounts
Allowance for doubtful accounts related to accounts receivable-customer		1,086
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	$ 1,145	$ 1,145