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Business Acquisition - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 10, 2017
Jun. 30, 2017
Apr. 09, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Payments to acquire businesses $ 6,000        
Goodwill   $ 68,913   $ 66,351 $ 65,982
Contingent considerations   2,000      
Contingent considerations, fair value     $ 500    
TAS Commercial Concrete          
Business Acquisition [Line Items]          
Goodwill     2,562    
Contingent considerations   $ 2,000      
Contingent considerations, fair value     $ 456    
TAS Commercial Concrete | Minimum          
Business Acquisition [Line Items]          
Property and equipment useful life 3 years        
TAS Commercial Concrete | Maximum          
Business Acquisition [Line Items]          
Property and equipment useful life 15 years