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Commitments and Contingencies - Other and Bonds (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) item
Obligation to perform subcontract work | Pending Litigation |
Commitments and Contingencies |
Letter of intent under dispute | item | 2
Damages stated | $ 9.0
Obligation to perform subcontract work | Customer | Pending Litigation |
Commitments and Contingencies |
Damages claimed | $ 15.0
Surety | Minimum |
Surety |
Percentage of business which has required bonds | 15.00%
Surety | Maximum |
Surety |
Percentage of business which has required bonds | 25.00%

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