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Credit Losses (Tables)
 6 Months Ended
Jun. 30, 2020
Credit Loss [Abstract]  
Summary Of Allowance For Credit Losses For Accounts Receivables The following table provides a roll-forward of the allowance for credit losses
 in 2020
that is deducted from the amortized cost basis of accounts receivable to present the net amount expected to be collected (amounts in thousands):
 
    
2020
  
Balance at January 1, 2020
    $ (525 ) 
Change for expected credit losses
 
 
(133
) 
Balance at March 31, 2020
 
 
(658
) 
Current period change for write-offs
 
 
37
 
Current period change for recoveries
 
 
—  
 
Current period change for expected credit losses
      83  
  
 
 
  
Balance at June 30, 2020
    $ (538 )