Business Segments: (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Details of reportable segment
Total utility plant	$ 1,456,398	$ 1,355,663	$ 1,456,398	$ 1,355,663	$ 1,415,705
Other assets	241,570	211,620	241,570	211,620
Total Assets	1,697,968	1,567,283	1,697,968	1,567,283	1,641,331
GOLDEN STATE WATER COMPANY
Details of reportable segment
Depreciation on transportation equipment	83	$ 96	165	$ 154
Total utility plant	1,434,014		1,434,014		1,394,742
Total Assets	$ 1,567,168		$ 1,567,168		$ 1,522,454