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Accounts Receivable, net
 6 Months Ended
Jun. 30, 2020
Receivables [Abstract]  
Accounts Receivable, net Accounts Receivable, net
        Accounts receivable at June 30, 2020 and December 31, 2019 were as follows (in thousands):
June 30,December 31,
20202019
Trade accounts receivable, net of allowance for credit losses of $7,333 and $5,129, respectively
$78,082  $101,718  
Unbilled receivables26,121  43,422  
Taxes receivable29,239  18,516  
Affiliated (1)
549  549  
Other receivables3,077  2,489  
Total accounts receivable, net$137,068  $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.