XML 33 R21.htm IDEA: XBRL DOCUMENT v3.20.2
Accounts Receivable and Allowance for Credit Losses (Tables)
 9 Months Ended
Sep. 30, 2020
Receivables [Abstract]  
Schedule of rollforward of allowance for credit losses The following is a rollforward of our allowance for credit losses.
​Balance at
Beginning of
Period		ExpenseWrite offOtherBalance at
End of
Period
Nine Months Ended September 30, 2020$837 $341 $(274)$— $904 
Nine Months Ended September 30, 2019576 255 (59)2 774