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ACQUISITIONS AND DECONSOLIDATION (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2017
Sep. 30, 2015
Jun. 30, 2016
Apr. 30, 2016
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Sep. 30, 2017
May 31, 2016
Acquisitions                  
Acquisitions, net of cash acquired         $ 5,362 $ 0 $ 12,778    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                 10.00%
Fair values of the assets acquired and liabilities assumed                  
Goodwill         $ 337,720 $ 321,110 $ 371,808    
Aircon Guardrails Private Limited                  
Acquisitions                  
Acquisitions, net of cash acquired $ 5,362                
Annual sales 10,000                
Fair values of the assets acquired and liabilities assumed                  
Intangible assets               $ 2,109  
Goodwill $ 3,327                
American Galvanizing                  
Acquisitions                  
Acquisitions, net of cash acquired   $ 12,778              
Annual sales   8,000              
Fair values of the assets acquired and liabilities assumed                  
Intangible assets   2,178              
Goodwill   $ 3,019              
IGC Galvanizing Industries (M) Sdn Bhd [Member]                  
Acquisitions                  
Ownership percentage acquired       30.00%          
Business Combination, Consideration Transferred       $ 5,841          
Valmont SM                  
Acquisitions                  
Ownership percentage acquired               5.20%  
Business Combination, Consideration Transferred     $ 5,168