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ACQUISITIONS - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended
Sep. 30, 2015
Jun. 30, 2016
Apr. 30, 2016
Sep. 24, 2016
May 31, 2016
Dec. 26, 2015
Acquisitions            
Goodwill       $ 327,863   $ 336,916
Ownership percentage by noncontrolling owners         10.00%  
American Galvanizing            
Acquisitions            
Payments to Acquire Businesses, Net of Cash Acquired $ 12,778          
Annual sales 10,000          
Goodwill 3,019          
Intangible assets $ 2,178          
IGC Galvanizing Industries (M) Sdn Bhd            
Acquisitions            
Percentage acquired     30.00%      
Consideration transfered     $ 5,841      
Valmont SM            
Acquisitions            
Percentage acquired       5.20%    
Consideration transfered   $ 5,168