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Business Acquisition - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 10, 2017
Apr. 09, 2017
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]          
Payments to acquire businesses       $ 0 $ 6,000
Tony Bagliore Concrete, Inc. (TBC)          
Business Acquisition [Line Items]          
Payments to acquire businesses $ 6,000        
Contingent considerations     $ 2,000    
Goodwill net of working capital adjustment   $ 3,100      
Contingent considerations, fair value   $ 456      
Tony Bagliore Concrete, Inc. (TBC) | Minimum          
Business Acquisition [Line Items]          
Property and equipment useful life   3 years      
Tony Bagliore Concrete, Inc. (TBC) | Maximum          
Business Acquisition [Line Items]          
Property and equipment useful life   15 years