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Business Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Apr. 09, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 68,913   $ 66,351 $ 65,982
Contingent consideration   $ (500)    
TAS Commercial Concrete        
Business Acquisition [Line Items]        
Accounts Receivables   3,239    
Retainage   1,860    
Fixed Assets, net   2,098    
Other   9    
Goodwill   2,562    
Other intangible assets   878    
Accounts payable   (2,017)    
Accrued expenses and other liabilities   (1,080)    
Contingent consideration   (456)    
Deferred tax liability   (1,093)    
Total Acquisition Consideration   $ 6,000