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Accounts Receivable
9 Months Ended
Sep. 30, 2015
Receivables [Abstract]  
Accounts Receivable
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


Contract receivables are primarily associated with developers, contractors and customers in connection with one of the Company's operating segments. Costs in excess of billings principally represent revenues recognized on contracts that were not billable as of the balance sheet date. These amounts will be billed in accordance with contract terms, generally as certain milestones are reached or upon shipment. All of the costs in excess of billings are expected to be collected within one year. In situations where billings exceed revenues recognized, the excess is included in billings in excess of cost in the Consolidated Balance Sheet.