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Prepaid Expenses and Other Assets
 12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Prepaid Expenses and Other Assets
4.
PREPAID EXPENSES AND OTHER ASSETS
Prepaid expenses and other assets consist of the following as of December 31 (in thousands):
 
    
2020
     
2019
  
Prepaid expenses
    $ 7,285      $ 8,282  
Revenues in excess of billings
      6,612        6,664  
Contract retainage
      2,267        1,832  
Income tax receivable
      7,823        2,675  
Other
      1,323        350  
    
 
 
     
 
 
  
Total prepaid expenses and other assets
    $ 25,310      $ 19,803