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 - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Long Lived Assets Held-for-sale [Line Items]    
Machinery and equipment $ 16,399 $ 16,399
Accumulated depreciation (8,185) (8,185)
Total 8,214 8,214
Shipyard    
Long Lived Assets Held-for-sale [Line Items]    
Machinery and equipment 3,619 3,619
Accumulated depreciation (1,605) (1,605)
Total 2,014 2,014
F&S    
Long Lived Assets Held-for-sale [Line Items]    
Machinery and equipment 12,780 12,780
Accumulated depreciation (6,580) (6,580)
Total $ 6,200 $ 6,200