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Certain Balance Sheet Components Accounts Receivable, Net, Additional Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current retainage contract receivables [Member]    
Accounts Receivable, Net (Line Items]    
Contract Receivable Retainage, Next Rolling Twelve Months $ 3,400 $ 4,700
Unbilled Contracts Receivable 3,500 4,000
Long Term Retainage Contract Receivables [Member]    
Accounts Receivable, Net (Line Items]    
Long-term unbilled retainage receivables 4,000 4,300
Contract Receivable Retainage, Due after Next Rolling Twelve Months $ 0 $ 0