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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2020
Accounts Receivable  
Schedule of components of accounts receivables

December 31, 

    

2020

    

2019

(in thousands)

  

  

Trade receivables:

 

  

 

  

Billed

$

135,201

$

191,579

Unbilled

 

29,754

 

52,052

Other receivables

 

1,631

 

4,124

Total

 

166,586

 

247,755

Less: allowance for credit losses

 

(4,815)

 

(5,181)

Accounts receivable, net

$

161,771

$

242,574