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SEGMENT REPORTING - Summary of Major Customers (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 item
SEGMENT REPORTING
Revenues from external customers	$ 48,151	$ 42,552	$ 43,380	$ 46,757	$ 37,573	$ 49,791	$ 62,563	$ 49,229	$ 180,840	$ 199,156
Number of major customers | item									3
Concentration risk (as a percent)									10.00%
Towers
SEGMENT REPORTING
Revenues from external customers									$ 160,210	170,919
Two customers
SEGMENT REPORTING
Number of major customers | item									2
Concentration risk (as a percent)									10.00%
Customer One | Tower and Weldments
SEGMENT REPORTING
Revenues from external customers									$ 111,480	124,759
Customer Two | Tower and Weldments
SEGMENT REPORTING
Revenues from external customers									$ 23,018	$ 45,214
Five customers
SEGMENT REPORTING
Number of major customers | item										5	5
Concentration risk (as a percent)									91.00%	92.00%
Customer Three | Towers
SEGMENT REPORTING
Revenues from external customers									$ 21,237

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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