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Significant Accounting Policies - Credit Losses - ASU 2016-13
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
numberOfLeases
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Accounts Receivable, Noncurrent, Credit Quality Indicator [Line Items]      
Accounts Receivable, Allowance for Credit Loss $ 3,283 $ 3,219  
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 1,015    
Accounts Receivable, Allowance for Credit Loss, Recovery (951)    
Regulatory Assets, Noncurrent $ 330,710 348,927 $ 324,358
Number of Net Investments in Sales-Type Leases | numberOfLeases 2    
COVID-19 Related Costs      
Accounts Receivable, Noncurrent, Credit Quality Indicator [Line Items]      
Regulatory Assets, Noncurrent $ 5,800    
COVID-19 Related Costs | Accounts Receivable      
Accounts Receivable, Noncurrent, Credit Quality Indicator [Line Items]      
Regulatory Assets, Noncurrent 2,900    
Residential [Member]      
Accounts Receivable, Noncurrent, Credit Quality Indicator [Line Items]      
Accounts Receivable, Allowance for Credit Loss 2,810 2,153  
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 1,294    
Accounts Receivable, Allowance for Credit Loss, Recovery (637)    
Commercial [Member]      
Accounts Receivable, Noncurrent, Credit Quality Indicator [Line Items]      
Accounts Receivable, Allowance for Credit Loss 206 704  
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) (233)    
Accounts Receivable, Allowance for Credit Loss, Recovery (265)    
Industrial [Member]      
Accounts Receivable, Noncurrent, Credit Quality Indicator [Line Items]      
Accounts Receivable, Allowance for Credit Loss 79 142  
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) (68)    
Accounts Receivable, Allowance for Credit Loss, Writeoff 5    
Accrued unbilled and other [Member]      
Accounts Receivable, Noncurrent, Credit Quality Indicator [Line Items]      
Accounts Receivable, Allowance for Credit Loss 188 $ 220  
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 22    
Accounts Receivable, Allowance for Credit Loss, Recovery $ (54)