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Accounts Receivable, net (Tables)
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Schedule of Accounts Receivable, Net Accounts receivable at December 31, 2020 and 2019 were as follows (in thousands):
December 31,
20202019
Trade accounts receivable, net of allowance for credit losses of $3,857 and $5,129, respectively
$65,684 $101,718 
Unbilled receivables26,215 43,422 
Taxes receivable14,292 18,516 
Affiliated (1)
549 549 
Other receivables3,867 2,489 
Total accounts receivable, net$110,607 $166,694 
(1)Amounts represent expenditures on behalf of non-consolidated affiliates.