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Acquisitions (Details) - USD ($)
$ in Thousands
Apr. 13, 2015
Jun. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Total consideration $ 11,374    
Accounts receivable 10,662    
Costs and estimated earnings in excess of billings on uncompleted contracts 2,102    
Other current assets 59    
Property and equipment 1,778    
Accounts payable (3,621)    
Billings in excess of costs and estimated earnings on uncompleted contracts (1,490)    
Other current liabilities (437)    
Net identifiable assets 9,053    
Goodwill $ 2,321 $ 48,918 $ 46,599