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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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