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Accounts Receivable, net (Tables)
9 Months Ended
Sep. 30, 2020
Receivables [Abstract]  
Schedule of Accounts Receivable 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.