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Business Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Apr. 09, 2017
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill   $ 69,470 $ 66,351 $ 65,982
Tony Bagliore Concrete, Inc. (TBC)        
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 at April 9, 2017 6,000      
Working Capital Adjustment (all attributable to Goodwill) 557      
Total Acquisition Consideration $ 6,557