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Accounts Receivable, net
9 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Accounts Receivable, net
7. Accounts Receivable, net

Accounts receivable, net consist of the following (in thousands):
 
 
September 30, 2018
 
December 31, 2017
Contracts in progress
 
$
183,584

 
$
167,809

Trade receivables
 
102,129

 
106,937

Unbilled retentions
 
65,597

 
50,957

Other receivables
 
3,780

 
476

Allowance for doubtful accounts
 
(4,226
)
 
(3,733
)
Total accounts receivable, net
 
$
350,864

 
$
322,446