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Revenues (Tables)
 12 Months Ended
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block]
(dollar in thousands)For The Year Ended December 31, 2023For The Year Ended December 31, 2022For The Year Ended December 31, 2021
Water:
Tariff-based revenues$394,623 $324,838 $345,562 
CPUC-approved surcharges (cost-recovery activities)2,955 2,461 3,280 
Other2,753 2,351 2,227 
Water revenues from contracts with customers
400,331 329,650 351,069 
WRAM under/(over)-collection (alternative revenue program)33,142 10,952 (3,957)
Total water revenues (1)
433,473 340,602 347,112 
Electric:
Tariff-based revenues40,130 39,750 37,124 
CPUC-approved surcharges (cost-recovery activities)567 144 310 
Electric revenues from contracts with customers
40,697 39,894 37,434 
BRRAM under/(over)-collection (alternative revenue program)1,135 92 911 
Total electric revenues41,832 39,986 38,345 
Contracted services:
Water 75,785 68,626 71,210 
Wastewater44,609 42,314 42,186 
Contracted services revenues from contracts with customers120,394 110,940 113,396 
Total AWR revenues
$595,699 $491,528 $498,853 
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
The opening and closing balances of the receivable from the U.S. government, contract assets and contract liabilities from contracts with customers, which related entirely to ASUS, are as follows:    
(dollar in thousands)December 31, 2023December 31, 2022
Unbilled receivables$9,693 $10,125 
Receivable from the U.S. government$91,489 $85,456 
Contract assets$14,378 $14,982 
Contract liabilities$1,352 $903