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Accounts Receivable
12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Accounts Receivable ACCOUNTS RECEIVABLE, NET

Accounts receivable at December 31 consisted of the following (in thousands):
 
2019
 
2018
Trade accounts receivable
$
133,238

 
$
124,609

Costs in excess of billings
20,607

 
22,634

Total accounts receivables
153,845

 
147,243

Less allowance for doubtful accounts
(6,330
)
 
(6,960
)
Accounts receivable
$
147,515

 
$
140,283



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