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Accounts Receivable, net
9 Months Ended
Sep. 30, 2020
Receivables [Abstract]  
Accounts Receivable, net Accounts Receivable, net
    Accounts receivable at September 30, 2020 and December 31, 2019 were as follows (in thousands):
September 30,December 31,
20202019
Trade accounts receivable, net of allowance for credit losses of $4,142 and $5,129, respectively
$61,619 $101,718 
Unbilled receivables23,050 43,422 
Taxes receivable11,219 18,516 
Affiliated (1)
549 549 
Other receivables3,384 2,489 
Total accounts receivable, net$99,821 $166,694 
(1)Amounts represent expenditures on behalf of non-consolidated affiliates.

    We estimate current expected credit losses on our accounts receivable at each reporting date. We estimate current expected credit losses based on our credit loss history, adjusted for current factors including global economic and business conditions, oil and natural gas industry and market conditions and customer mix. During the three months ended September 30, 2020, $2.4 million was written off against the allowance for credit losses.