Annual report pursuant to Section 13 and 15(d)

ASSETS HELD FOR SALE - Significant Assets Included in Assets Held for Sale (Details)

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ASSETS HELD FOR SALE - Significant Assets Included in Assets Held for Sale (Details) - Held for sale
$ in Thousands
Dec. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Less: accumulated depreciation $ (96,765)
Total assets held for sale 104,576
South Yard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Less: accumulated depreciation (40,838)
Total assets held for sale 46,779
North Yard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Less: accumulated depreciation (55,629)
Total assets held for sale 55,894
Prospect Shipyard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Less: accumulated depreciation (298)
Total assets held for sale 1,903
Land  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 5,492
Land | South Yard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 3,335
Land | North Yard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 2,157
Land | Prospect Shipyard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 0
Buildings and improvements  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 123,830
Buildings and improvements | South Yard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 84,282
Buildings and improvements | North Yard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 39,548
Buildings and improvements | Prospect Shipyard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 0
Machinery and equipment  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 72,019
Machinery and equipment | South Yard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 0
Machinery and equipment | North Yard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment 69,818
Machinery and equipment | Prospect Shipyard  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Property, plant and equipment $ 2,201