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Accounting Policies - Retainage (Details 4) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounting Policies [Abstract] |  |
Contract Receivable Retainage, Next Twelve Months | $ 100,054 | $ 75,590
Construction Contractor, Receivable, Retainage, after Year One | 2,761 | 14,228
Total Retainage | $ 102,815 | $ 89,818

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