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Accounts Receivable, net
3 Months Ended
Mar. 31, 2021
Receivables [Abstract]  
Accounts Receivable, net Accounts Receivable, net
    Accounts receivable at March 31, 2021 and December 31, 2020 were as follows (in thousands):
March 31,December 31,
20212020
Trade accounts receivable, net of allowance for credit losses of $4,112 and $3,857, respectively
$67,171 $65,684 
Unbilled receivables29,923 26,215 
Taxes receivable15,392 14,292 
Affiliated (1)
549 549 
Other receivables3,546 3,867 
Total accounts receivable, net$116,581 $110,607 
(1)Amounts represent expenditures on behalf of non-consolidated affiliates.