Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - PPE, Insurance and Other (Details)

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Summary of Significant Accounting Policies - PPE, Insurance and Other (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Insurance receivables      
Insurance receivables $ 4.2 $ 2.0  
Insurance Liabilities      
Insurance liability 4.2 2.0  
Advertising      
Advertising expense $ 1.7 $ 1.1 $ 1.1
Buildings and land improvements | Minimum      
Property and Equipment      
Estimated Useful Life (in years) 20 years    
Buildings and land improvements | Maximum      
Property and Equipment      
Estimated Useful Life (in years) 40 years    
Software | Minimum      
Property and Equipment      
Estimated Useful Life (in years) 3 years    
Software | Maximum      
Property and Equipment      
Estimated Useful Life (in years) 6 years    
Company vehicles | Minimum      
Property and Equipment      
Estimated Useful Life (in years) 3 years    
Company vehicles | Maximum      
Property and Equipment      
Estimated Useful Life (in years) 8 years    
Equipment | Minimum      
Property and Equipment      
Estimated Useful Life (in years) 6 years    
Equipment | Maximum      
Property and Equipment      
Estimated Useful Life (in years) 10 years