Quarterly report pursuant to Section 13 or 15(d)

Impairments and (Gain) Loss on Assets Held for Sale - Summary of Assets Held for Sale (Details)

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Impairments and (Gain) Loss on Assets Held for Sale - Summary of Assets Held for Sale (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - Shipyard - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Long Lived Assets Held-for-sale [Line Items]    
Machinery and equipment $ 4,587 $ 11,877
Accumulated depreciation (2,787) (5,677)
Total $ 1,800 $ 6,200