Business Segments: (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Details of reportable segment
Total utility plant	$ 1,542,423	$ 1,432,397	$ 1,512,043
Other assets	250,398	228,492
Total Assets	1,792,821	1,660,889	1,791,603
GOLDEN STATE WATER COMPANY
Details of reportable segment
Depreciation on transportation equipment		$ 82
Total utility plant	1,426,175		1,400,489
Total Assets	1,561,723		$ 1,560,782
Golden State Water Company and Bear Valley Electric Service Inc.
Details of reportable segment
Depreciation on transportation equipment	$ 95