XML 25 R13.htm IDEA: XBRL DOCUMENT v3.8.0.1
Accounts Receivable
9 Months Ended
Sep. 30, 2017
Receivables [Abstract]  
Accounts Receivable
6. Accounts Receivable

Accounts receivable consist of the following (in thousands):
 
 
September 30, 2017
 
December 31, 2016
Contracts in progress
 
$
122,457

 
$
121,666

Unbilled retentions
 
42,714

 
35,069

Trade receivables
 
103,554

 
113,380

Other receivables
 
383

 
1,102

Allowance for doubtful accounts
 
(4,026
)
 
(3,619
)
Total accounts receivable
 
$
265,082

 
$
267,598