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ACCOUNTS RECEIVABLE, NET OF ALLOWANCE FOR CREDIT LOSSES
 6 Months Ended
Jun. 30, 2020
Credit Loss [Abstract]  
ACCOUNTS RECEIVABLE, NET OF ALLOWANCE FOR CREDIT LOSSES ACCOUNTS RECEIVABLE, NET OF ALLOWANCE FOR CREDIT LOSSES
Accounts receivable represent receivables from customers for collection, transfer, recycling, disposal and other services. Our accounts receivable are recorded when billed or when related revenue is earned, if earlier, and represent claims against third-parties that will be settled in cash. The carrying value of our accounts receivable, net of allowance for credit losses represents its estimated net realizable value. Estimates are used in determining our allowance for credit losses based on, among other things, our historical loss trends, the age of outstanding accounts receivable, and current and expected economic conditions. Additions – charged to expense in the six months ended June 30, 2020 considers the current economic conditions associated with the COVID-19 pandemic and the potential impact to our customers’ ability to pay for services that we have provided. Our reserve is evaluated and revised on a monthly basis. Past due accounts receivable are written off when deemed to be uncollectible.
A summary of the changes to allowance for credit losses follows:

Six Months Ended
June 30, 2020
Balance at beginning of period$1,468  
Cumulative effect of new accounting principle189  
Additions - charged to expense1,697  
Deductions - bad debts written off, net of recoveries(739) 
Balance at end of period$2,615