Regulatory Matters 3 (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Regulatory matters:
Regulatory asset authorized under settlement	$ 2,700
Other Liabilities, Current	10,341	$ 10,731
GSWC
Regulatory matters:
Under (over) collection	(2,450)	(28,340)
Other Liabilities, Current	9,745	9,432
Other Regulatory Assets Net [Member] | GSWC
Regulatory matters:
Under (over) collection	18,842	18,440
Pension Costs and Other Postretirement Benefit Costs | GSWC
Regulatory matters:
Regulatory asset authorized under settlement	43,400
Under (over) collection	40,693	$ 33,124
Two-way pension balancing account | Water Service Utility Operations [Member] | Pension Costs and Other Postretirement Benefit Costs | GSWC
Regulatory matters:
Regulatory asset authorized under settlement	(1,500)
Two-way pension balancing account | Electric: | Pension Costs and Other Postretirement Benefit Costs | GSWC
Regulatory matters:
Regulatory asset authorized under settlement	$ (1,200)