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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 5 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Long-term Debt [Member]    
Note payable to banks    
Balance Outstanding at December 31, $ 205,500 $ 134,200
Short-term borrowing (excluding letters of credit)    
Note payable to banks    
Average Amount Outstanding $ 165,167 $ 162,995
Weighted Average Annual Interest Rate (as a percent) 1.05% 1.47%
Maximum Amount Outstanding $ 205,500 $ 249,200
AWR | Long-term Debt [Member]    
Note payable to banks    
Balance Outstanding at December 31, $ 174,500 $ 114,000
AWR | Short-term borrowing (excluding letters of credit)    
Note payable to banks    
Interest Rate at the end of the period (as a percent) 0.78% 1.19%
Average Amount Outstanding $ 139,926 $ 160,495
Weighted Average Annual Interest Rate (as a percent) 0.91% 1.47%
Maximum Amount Outstanding $ 174,500 $ 249,000