Quarterly report pursuant to Section 13 or 15(d)

Shipyard Transaction and Discontinued Operations - Summary of Carrying Values of Major Classes of Assets and Liabilities of Discontinued Operations (Details)

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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
Sep. 30, 2021
Dec. 31, 2020
Current assets of discontinued operations:    
Contract receivables and retainage, net   $ 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   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 $ 27 57,752
Contract liabilities   4,867
Accrued expenses and other liabilities 149 988
Total current liabilities of discontinued operations $ 176 $ 63,607