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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