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Shipyard Transaction and Discontinued Operations - Summary of Carrying Values of Major Classes of Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Current assets of discontinued operations: |  |
Contract receivables and retainage, net | $ 2 | $ 1,304
Contract assets |  | 62,423
Prepaid expenses and other assets |  | 270
Inventory |  | 105
Assets held for sale |  | 2,014
Total current assets of discontinued operations | 2 | 66,116
Noncurrent assets of discontinued operations: |  |
Property, plant and equipment, net |  | 36,280
Other noncurrent assets |  | 2,889
Total noncurrent assets of discontinued operations |  | 39,169
Current liabilities of discontinued operations: |  |
Accounts payable | 225 | 57,752
Contract liabilities |  | 4,867
Accrued expenses and other liabilities | 546 | 988
Total current liabilities of discontinued operations | $ 771 | $ 63,607

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