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Accounts Receivable
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Accounts Receivable
ACCOUNTS RECEIVABLE, NET

Accounts receivable at December 31 consisted of the following (in thousands):
 
2018
 
2017
Trade accounts receivable
$
124,609

 
$
140,209

Costs in excess of billings
22,634

 
11,610

Total accounts receivables
147,243

 
151,819

Less allowance for doubtful accounts
(6,960
)
 
(6,434
)
Accounts receivable
$
140,283

 
$
145,385



Refer to Note 3 of the Company's consolidated financial statements included in this annual report on Form 10-K for additional information concerning the Company's costs in excess of billings.