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Acquisition (Details)
people in Thousands, $ in Thousands
Sep. 25, 2020
USD ($)
a
Jun. 01, 2020
USD ($)
customerConnection
people
waterSystem
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Goodwill     $ 31,842 $ 2,615
Rainier View Water Company        
Business Acquisition [Line Items]        
Number of people served | people   35    
Number of customer connections | customerConnection   18,500    
Water systems | waterSystem   27    
Kalaeloa Water Company        
Business Acquisition [Line Items]        
Area of Land | a 3,700      
Rainier View Water Company        
Business Acquisition [Line Items]        
Cash paid   $ 37,600    
Assets acquired and liabilities assumed   32,600    
Assets acquired and liabilities assumed, property, plant, and equipment   31,100    
Recognized identifiable assets acquired and liabilities assumed, liabilities   23,500    
Recognized identifiable assets acquired and liabilities assumed, aid for construction   21,300    
Goodwill   $ 28,500    
Kalaeloa Water Company        
Business Acquisition [Line Items]        
Cash paid $ 3,100      
Assets acquired and liabilities assumed 2,800      
Assets acquired and liabilities assumed, property, plant, and equipment 2,100      
Recognized identifiable assets acquired and liabilities assumed, liabilities 400      
Goodwill $ 700