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Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in allowance for doubtful accounts            
Balance at beginning of year $ 951 $ 1,041 $ 764      
Provision charged to expense 609 841 989      
Accounts written off, net of recoveries 644 931 712      
Balance at end of year 916 951 1,041      
Components of allowance for doubtful accounts            
Allowance for doubtful accounts related to accounts receivable-customer       $ 857 $ 892 $ 806
Allowance for doubtful accounts related to other accounts receivable       59 59 235
Total allowance for doubtful accounts 951 951 1,041 916 951 1,041
GSWC            
Changes in allowance for doubtful accounts            
Balance at beginning of year 951 865 761      
Provision charged to expense 607 850 816      
Accounts written off, net of recoveries 642 764 712      
Balance at end of year 916 951 865      
Components of allowance for doubtful accounts            
Allowance for doubtful accounts related to accounts receivable-customer       857 892 806
Allowance for doubtful accounts related to other accounts receivable       59 59 59
Total allowance for doubtful accounts $ 951 $ 865 $ 865 $ 916 $ 951 $ 865