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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 |  |  |

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