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Revenues (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block]
(dollar in thousands)For The Year Ended December 31, 2021For The Year Ended December 31, 2020For The Year Ended December 31, 2019
Water:
Tariff-based revenues$345,562 $329,670 $305,244 
CPUC-approved surcharges (cost-recovery activities)3,280 3,736 4,322 
Other2,227 2,100 2,006 
Water revenues from contracts with customers
351,069 335,506 311,572 
WRAM (over)/under-collection (alternative revenue program)(3,957)(4,869)8,258 
Total water revenues
347,112 330,637 319,830 
Electric:
Tariff-based revenues37,124 35,283 36,628 
CPUC-approved surcharges (cost-recovery activities)310 686 410 
Electric revenues from contracts with customers
37,434 35,969 37,038 
BRRAM under-collection (alternative revenue program)911 1,055 2,510 
Total electric revenues38,345 37,024 39,548 
Contracted services:
Water 71,210 74,898 59,868 
Wastewater42,186 45,684 54,623 
Contracted services revenues from contracts with customers113,396 120,582 114,491 
Total revenues$498,853 $488,243 $473,869 
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, 2021December 31, 2020
Unbilled receivables$14,835 $14,924 
Receivable from the U.S. government$79,818 $74,670 
Contract assets$9,587 $10,257 
Contract liabilities$257 $1,800