Annual report pursuant to Section 13 and 15(d)

Operating Segments - Summarized Segment Financial Information (Parenthetical) (Details)

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Operating Segments - Summarized Segment Financial Information (Parenthetical) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Asset impairments     $ 17,223 $ 4,445 $ 7,672
Gain on insurance recoveries       3,571  
Corporate          
Segment Reporting Information [Line Items]          
Restructuring costs     700    
Fabrication          
Segment Reporting Information [Line Items]          
Increase in operating loss due to project charges     8,400 2,400  
Asset impairments     8,700   6,700
Asset impairments, gains on the sale of assets and insurance proceeds       8,200  
Gain on sale of South Texas Properties, net       8,000  
Shipyard          
Segment Reporting Information [Line Items]          
Increase in operating loss due to project charges   $ 5,800 7,200 6,700 34,500
Asset impairments     7,900 1,000 $ 1,200
Services          
Segment Reporting Information [Line Items]          
Increase in operating loss due to project charges     $ 1,600    
Fabrication and Shipyard          
Segment Reporting Information [Line Items]          
Increase in operating loss due to project charges $ 13,800        
Asset impairments       $ 3,400