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Construction Contracts - Summary of Net Position (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Contractors [Abstract] |  |  |  |
Costs incurred on uncompleted construction contracts | $ 939,312 | $ 905,037 |  |
Estimated earnings | 33,399 | 32,130 |  |
Billings | (975,719) | (943,117) |  |
Net position | (3,008) | (5,950) |  |
Construction contract costs and estimated earnings in excess of billings | 54 | 138 | $ 458 | $ 249
Billings in excess of construction contract costs and estimated earnings | $ (3,062) | $ (6,088) | $ (6,311) | $ (5,306)

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