Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details)
$ in Millions
 12 Months Ended
Apr. 19, 2018
subcontractor
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 01, 2012
USD ($)
Loss Contingencies [Line Items]        
Capitalization of construction costs       $ 27.3
Operating leases, accumulated depreciation   $ 12.1 $ 10.9  
Lease liability included in long-term lease obligations   18.7 20.3  
Current portion of lease liability   $ 1.6 $ 1.4  
Operating Leases | Minimum        
Loss Contingencies [Line Items]        
Lease term   2 years    
Operating Leases | Maximum        
Loss Contingencies [Line Items]        
Lease term   15 years    
Building Facilities        
Loss Contingencies [Line Items]        
Lease term   15 years    
Joseph Waggoner v VSE re Overtime Compensation        
Loss Contingencies [Line Items]        
Number of subcontractors named in lawsuit | subcontractor 2