Quarterly report pursuant to Section 13 or 15(d)

REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Remaining Performance Obligation by Segment (Details)

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REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Remaining Performance Obligation by Segment (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
vessel
Dec. 31, 2018
vessel
Mar. 31, 2018
vessel
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation $ 454,522    
Number of multi-purpose service vessels | vessel 2 2 2
Fabrication | Operating Segments      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation $ 53,496    
Shipyard | Disputed      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation 21,900    
Shipyard | Operating Segments      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation 388,239    
Services | Operating Segments      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation $ 12,787