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Contracts in Progress - Summary of Costs and Estimated Earnings on Contracts (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Contract With Customer Asset And Liability [Abstract] |  |
Costs incurred on uncompleted contracts | $ 123,572 | $ 113,856
Estimated contract earnings in excess of costs | 165,405 | 151,423
Estimated contract earnings to date | 288,977 | 265,279
Less: billed to date | (283,526) | (260,142)
Net contract assets | $ 5,451 | $ 5,137

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