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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of Significant Accounting Policies [Line Items]              
Revenue from contracts with customers $ 214,963 $ 209,541 $ 499,840 $ 515,567      
Total operating revenue 232,537 221,288 $ 537,679 530,779      
Maximum collection period     24 months        
Total non-regulated revenue $ 4,118 4,703 $ 14,149 13,967      
Lessee options to extend the lease 15 years   15 years        
2019 $ 3,153   $ 3,153        
2020 2,587   2,587        
2021 1,880   1,880        
2022 1,078   1,078        
2023 584   584        
Thereafter 871   871        
Cash and cash equivalents 51,257   51,257     $ 47,176  
Restricted cash (included in taxes, prepaid expenses and other assets) 566   566     539  
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows 51,823 67,092 51,823 67,092   $ 47,715 $ 95,352
Operating lease liability $ 14,306   $ 14,306        
ASU 2016-02              
Summary of Significant Accounting Policies [Line Items]              
Operating lease liability         $ 13,800    
Minimum              
Summary of Significant Accounting Policies [Line Items]              
Operating lease term 5 years   5 years        
Maximum              
Summary of Significant Accounting Policies [Line Items]              
Operating lease term 10 years   10 years        
Regulated water and wastewater services              
Summary of Significant Accounting Policies [Line Items]              
Revenue from contracts with customers $ 214,963 209,541 $ 499,840 515,567      
Regulatory balancing account revenue 17,574 11,747 37,839 15,212      
Total operating revenue 232,537 221,288 537,679 530,779      
Residential              
Summary of Significant Accounting Policies [Line Items]              
Revenue from contracts with customers 139,137 138,939 330,745 340,107      
Business              
Summary of Significant Accounting Policies [Line Items]              
Revenue from contracts with customers 38,247 38,538 95,433 97,720      
Industrial              
Summary of Significant Accounting Policies [Line Items]              
Revenue from contracts with customers 9,077 8,987 23,866 24,507      
Public authorities              
Summary of Significant Accounting Policies [Line Items]              
Revenue from contracts with customers 12,482 12,180 24,566 25,875      
Other              
Summary of Significant Accounting Policies [Line Items]              
Revenue from contracts with customers 16,020 10,897 25,230 27,358      
Operating and maintenance revenue              
Summary of Significant Accounting Policies [Line Items]              
Revenue from contracts with customers 2,929 2,816 9,248 8,278      
Other non-regulated revenue              
Summary of Significant Accounting Policies [Line Items]              
Revenue from contracts with customers 626 1,328 3,189 4,053      
Non-regulated revenue              
Summary of Significant Accounting Policies [Line Items]              
Revenue from contracts with customers 3,555 4,144 12,437 12,331      
Lease revenue 563 559 1,712 1,636      
Total non-regulated revenue $ 4,118 $ 4,703 $ 14,149 $ 13,967