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Segment Information - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
reporting_unit
segment
Dec. 31, 2017
USD ($)
Apr. 03, 2017
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 2    
Number of operating segments | segment 2    
Number of reporting units | reporting_unit 2    
Revenue recognition, contract term 1 month    
Business Acquisition [Line Items]      
Goodwill $ 85,231 $ 85,231  
Amortization of intangible assets 2,400 1,800  
Tealstone      
Business Acquisition [Line Items]      
Goodwill     $ 30,411
Heavy Civil Construction      
Business Acquisition [Line Items]      
Goodwill 54,800    
Amortization of intangible assets 700 500  
Residential Construction      
Business Acquisition [Line Items]      
Goodwill 30,400   $ 30,400
Amortization of intangible assets $ 1,700 $ 1,300