Commitments 3 (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Water Purchase Commitments [Member] \| GSWC
Purchase commitments
Total commitment under agreement	$ 4,445
Bear Valley Electric \| Electric Service Utility Operations [Member]
Purchase commitments
Total commitment under agreement	$ 5,200

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration