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Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2015
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable consists of the following (in thousands):
 
September 30, 2015
 
December 31, 2014
Trade accounts receivable
$
125,237

 
$
105,421

Contract receivables:
 
 
 
Amounts billed
39,183

 

Costs in excess of billings
17,411

 

Total contract receivables
56,594

 

Total accounts receivable
181,831

 
105,421

Less allowance for doubtful accounts
(4,714
)
 
(4,280
)
Accounts receivable
$
177,117

 
$
101,141