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Accounts Receivable
12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Accounts Receivable ACCOUNTS RECEIVABLE, NET
Accounts receivable at December 31 consisted of the following (in thousands):
20212020
Trade accounts receivable$185,745 $174,604 
Costs in excess of billings54,437 26,915 
Total accounts receivables240,182 201,519 
Less allowance for doubtful accounts(3,738)(3,529)
Accounts receivable, net$236,444 $197,990 

Refer to Note 3 "Revenue" concerning the Company's costs in excess of billings.