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Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in allowance for doubtful accounts            
Balance at beginning of year $ 916 $ 951 $ 1,041      
Provision charged to expense 5,016 609 841      
Accounts written off, net of recoveries 616 644 931      
Balance at end of year 5,316 916 951      
Components of allowance for doubtful accounts            
Allowance for doubtful accounts related to accounts receivable-customer       $ 5,263 $ 857 $ 892
Allowance for doubtful accounts related to other accounts receivable       53 59 59
Total allowance for doubtful accounts 916 916 1,041 5,316 916 951
GSWC            
Changes in allowance for doubtful accounts            
Balance at beginning of year 916 951 865      
Provision charged to expense 4,703 607 850      
Provision for Doubtful Accounts transfer to BVESI (79) 0 0      
Accounts written off, net of recoveries 580 642 764      
Balance at end of year 4,960 916 951      
Components of allowance for doubtful accounts            
Allowance for doubtful accounts related to accounts receivable-customer       4,907 857 892
Allowance for doubtful accounts related to other accounts receivable       53 59 59
Total allowance for doubtful accounts $ 4,960 $ 951 $ 951 $ 4,960 $ 916 $ 951