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Revenue from Contract with Customers (Tables)
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue For the three and nine months ended September 30, 2021 and 2020, disaggregated revenues from contracts with customers by segment were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(dollar in thousands)2021202020212020
Water:
Tariff-based revenues$100,256 $97,036 $261,231 $243,553 
Surcharges (cost-recovery activities)1,095 1,217 2,604 2,913 
Other586 569 1,626 1,556 
Water revenues from contracts with customers
101,937 98,822 265,461 248,022 
WRAM under (over)-collection (alternative revenue program)831 (121)3,969 9,177 
Total water revenues
102,768 98,701 269,430 257,199 
Electric:
Tariff-based revenues8,791 8,531 28,798 25,948 
Surcharges (cost-recovery activities)32 188 278 624 
Electric revenues from contracts with customers
8,823 8,719 29,076 26,572 
BRRAM (over) under-collection (alternative revenue program)(259)(431)(865)363 
Total electric revenues8,564 8,288 28,211 26,935 
Contracted services:
Water 15,454 17,143 53,102 45,316 
Wastewater9,969 9,556 31,486 34,593 
Contracted services revenues from contracts with customers25,423 26,699 84,588 79,909 
Total AWR revenues$136,755 $133,688 $382,229 $364,043 
Contract with Customer, Asset and Liability
The opening and closing balances of ASUS's unbilled receivables, receivable from the U.S. government, contract assets, and contract liabilities from contracts with customers, which are related entirely to ASUS, were as follows:    
(dollar in thousands)September 30, 2021December 31, 2020
Unbilled receivables$11,041 $14,924 
Receivable from the U.S. government$81,854 $74,670 
Contract assets$10,748 $10,257 
Contract liabilities$555 $1,800