Quarterly report pursuant to Section 13 or 15(d)

REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Disaggregation of Revenue (Details)

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REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Revenue $ 67,605 $ 57,290
Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue (1,215) (488)
Fabrication    
Disaggregation of Revenue [Line Items]    
Revenue 12,631 17,343
Shipyard    
Disaggregation of Revenue [Line Items]    
Revenue 36,587 18,565
Services    
Disaggregation of Revenue [Line Items]    
Revenue 19,602 21,870
Fixed-price and unit-rate    
Disaggregation of Revenue [Line Items]    
Revenue 51,874 44,402
Fixed-price and unit-rate | Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue (614) (453)
Fixed-price and unit-rate | Fabrication    
Disaggregation of Revenue [Line Items]    
Revenue 12,631 17,343
Fixed-price and unit-rate | Shipyard    
Disaggregation of Revenue [Line Items]    
Revenue 33,626 17,222
Fixed-price and unit-rate | Services    
Disaggregation of Revenue [Line Items]    
Revenue 6,231 10,290
T&M    
Disaggregation of Revenue [Line Items]    
Revenue 13,583 11,928
T&M | Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue 0 0
T&M | Fabrication    
Disaggregation of Revenue [Line Items]    
Revenue 0 0
T&M | Shipyard    
Disaggregation of Revenue [Line Items]    
Revenue 2,961 1,343
T&M | Services    
Disaggregation of Revenue [Line Items]    
Revenue 10,622 10,585
Other    
Disaggregation of Revenue [Line Items]    
Revenue 2,148 960
Other | Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue (601) (35)
Other | Fabrication    
Disaggregation of Revenue [Line Items]    
Revenue 0 0
Other | Shipyard    
Disaggregation of Revenue [Line Items]    
Revenue 0 0
Other | Services    
Disaggregation of Revenue [Line Items]    
Revenue $ 2,749 $ 995