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SEGMENT REPORTING - Summary of Major Customers (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) customer | Dec. 31, 2017 USD ($) customer
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |
Revenues from external customers | $ 27,187 | $ 31,445 | $ 36,781 | $ 29,967 | $ 17,768 | $ 29,595 | $ 43,362 | $ 56,060 | $ 125,380 | $ 146,785
Towers and Heavy Fabrications |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 68,815 |
Two customers | Customer concentration | Revenues |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |
Number of major customers | customer |  |  |  |  |  |  |  |  | 2 |
Two customers | Customer concentration | Revenues | Minimum |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 10.00% |
Two customers | Customer concentration | Revenues | Towers and Heavy Fabrications |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 72,851 |
Customer One | Customer concentration | Revenues |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |
Number of major customers | customer |  |  |  |  |  |  |  |  |  | 1
Customer One | Customer concentration | Revenues | Minimum |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  | 10.00%
Customer One | Customer concentration | Revenues | Towers and Heavy Fabrications |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  | $ 100,413
Five customers | Customer concentration | Revenues |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |
Number of major customers | customer |  |  |  |  |  |  |  |  | 5 | 5
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 78.00% | 85.00%

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