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Business Acquisition - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 05, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Federal statutory tax rate   35.00% 35.00% 35.00%
GLM Concrete Solutions, LLC        
Business Acquisition [Line Items]        
Issued and outstanding membership interest acquired 49.00%      
TAS Commercial Concrete        
Business Acquisition [Line Items]        
Payments to acquire businesses $ 112,000      
Goodwill, net of working capital adjustment 32,600      
Goodwill expected to be tax deductible $ 32,600      
Goodwill, tax basis, amortization period 15 years      
Acquisition related costs $ 400      
Minimum | TAS Commercial Concrete        
Business Acquisition [Line Items]        
Property and equipment useful life 3 years      
Maximum | TAS Commercial Concrete        
Business Acquisition [Line Items]        
Property and equipment useful life 15 years