Annual report pursuant to Section 13 and 15(d)

ASSETS HELD FOR SALE - Narrative (Details)

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ASSETS HELD FOR SALE - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
machine
crane
Dec. 31, 2017
USD ($)
building
drydock
Dec. 31, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain (loss) on sale of assets       $ 7,642,000 $ (259,000) $ 0
Property, plant and equipment, net $ 79,930,000     79,930,000 88,899,000  
Insured event, gain (loss)       3,571,000 0 $ 0
Disposed of by sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain (loss) on sale of assets       7,700,000    
Held for sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Property, plant and equipment held for sale 18,935,000     18,935,000    
Impairment of asset held for sale       2,400,000 1,000,000  
Texas South Yard And Texas North Yard | Disposed of by sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of productive assets       1,300,000    
Gain (loss) on sale of assets       (300,000)    
South Texas Fabrication Yards, South Yard | Disposed of by sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of productive assets       53,800,000    
Gain (loss) on disposition       3,900,000    
Proceeds from sale of assets     $ 55,000,000      
Selling costs     1,200,000      
South Texas Fabrication Yards, North Yard            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Property, plant and equipment, net 800,000     800,000    
South Texas Fabrication Yards, North Yard | Disposed of by sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of productive assets       27,400,000    
Gain (loss) on disposition       4,100,000    
Proceeds from sale of assets 28,000,000     28,000,000    
Selling costs 600,000          
Disposal group, not included in sale 18,800,000     18,800,000    
South Texas Fabrication Yards, North Yard | Held for sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Insurance recoveries     9,000,000      
Insured event, gain (loss)     0      
Fabrication Division | Held for sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Property, plant and equipment held for sale 18,011,000     $ 18,011,000    
Number of cranes | crane       3    
Number of bending roll machines | machine       2    
South Texas Fabrication Yards | Held for sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from property insurance policy       $ 9,400,000 6,000,000  
Insurance settlement     $ 15,400,000      
South Texas Fabrication Yards, North Yard, Assets Under Agreement To Sell | Held for sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Insurance recoveries   $ 5,200,000     1,300,000  
Insured event, gain (loss)       3,600,000 0  
Impairment of asset held for sale       1,400,000    
South Texas Properties, Total Loss Of Buildings | Held for sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Insurance recoveries         1,500,000  
South Texas Properties, Estimated Future Repairs | Held for sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Insurance recoveries         3,200,000  
Prospect Shipyard | Disposed of by sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain (loss) on sale of assets         (300,000)  
Proceeds from sale of assets         $ 2,000,000  
Prospect Shipyard | Held for sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Property, plant and equipment held for sale $ 924,000     924,000    
Impairment of asset held for sale       $ 1,000,000    
Number of drydocks sold | drydock         2  
Building | South Texas Properties, Total Loss Of Buildings | Held for sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of buildings | building         2