SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Note Payable to Banks Schedule (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Long-term Debt
Note payable to banks
Balance Outstanding at December 31,	$ 277,500	$ 205,500
Short-term borrowing (excluding letters of credit)
Note payable to banks
Average Amount Outstanding	$ 226,556	$ 165,167
Weighted Average Annual Interest Rate (as a percent)	2.55%	1.05%
Maximum Amount Outstanding	$ 277,500	$ 205,500
AWR | Long-term Debt
Note payable to banks
Balance Outstanding at December 31,	$ 255,500	$ 174,500
AWR | Short-term borrowing (excluding letters of credit)
Note payable to banks
Interest Rate at the end of the period (as a percent)	5.07%	0.78%
Average Amount Outstanding	$ 213,758	$ 139,926
Weighted Average Annual Interest Rate (as a percent)	2.56%	0.91%
Maximum Amount Outstanding	$ 255,500	$ 174,500