Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Revenue $ 60,231 $ 49,712 $ 54,014 $ 57,290 $ 37,277 $ 49,884 $ 45,868 $ 37,993 $ 221,247 $ 171,022 $ 286,326
Eliminations                      
Disaggregation of Revenue [Line Items]                      
Revenue                 (3,827) (5,200) (3,273)
Fixed-price and unit-rate                      
Disaggregation of Revenue [Line Items]                      
Revenue                 165,505 129,234 212,770
Fixed-price and unit-rate | Eliminations                      
Disaggregation of Revenue [Line Items]                      
Revenue                 (2,414) (5,096) (3,062)
Fixed-price and unit-rate | Fabrication                      
Disaggregation of Revenue [Line Items]                      
Revenue                 37,943 57,880 88,683
Fixed-price and unit-rate | Shipyard                      
Disaggregation of Revenue [Line Items]                      
Revenue                 88,887 47,787 95,958
Fixed-price and unit-rate | Services                      
Disaggregation of Revenue [Line Items]                      
Revenue                 38,612 28,465 31,191
Fixed-price and unit-rate | EPC                      
Disaggregation of Revenue [Line Items]                      
Revenue                 2,477 198 0
Time-and-materials                      
Disaggregation of Revenue [Line Items]                      
Revenue                 51,018 40,092 72,426
Time-and-materials | Eliminations                      
Disaggregation of Revenue [Line Items]                      
Revenue                 0 0 0
Time-and-materials | Fabrication                      
Disaggregation of Revenue [Line Items]                      
Revenue                 0 0
Time-and-materials | Shipyard                      
Disaggregation of Revenue [Line Items]                      
Revenue                 7,537 4,912 13,544
Time-and-materials | Services                      
Disaggregation of Revenue [Line Items]                      
Revenue                 43,481 35,180 58,882
Time-and-materials | EPC                      
Disaggregation of Revenue [Line Items]                      
Revenue                 0 0 0
Other                      
Disaggregation of Revenue [Line Items]                      
Revenue                 4,724 1,696 1,130
Other | Eliminations                      
Disaggregation of Revenue [Line Items]                      
Revenue                 (1,413) (104) (211)
Other | Fabrication                      
Disaggregation of Revenue [Line Items]                      
Revenue                 0 0 0
Other | Shipyard                      
Disaggregation of Revenue [Line Items]                      
Revenue                 0 0 0
Other | Services                      
Disaggregation of Revenue [Line Items]                      
Revenue                 6,137 1,800 1,341
Other | EPC                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 0 $ 0 $ 0