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GOODWILL AND INTANGIBLE ASSETS - Carrying Amount of Goodwill by Segment (Details)
$ in Thousands
3 Months Ended
Apr. 01, 2017
USD ($)
Carrying amount of goodwill  
Balance at the beginning of the period $ 321,110
Foreign currency translation 2,951
Balance at the end of the period 324,061
Engineered Support Structures Segment  
Carrying amount of goodwill  
Balance at the beginning of the period 94,314
Foreign currency translation 765
Balance at the end of the period 95,079
Energy and Mining Segment  
Carrying amount of goodwill  
Balance at the beginning of the period 72,212
Foreign currency translation 1,946
Balance at the end of the period 74,158
Utility Support Structures Segment  
Carrying amount of goodwill  
Balance at the beginning of the period 75,404
Foreign currency translation 0
Balance at the end of the period 75,404
Coatings Segment  
Carrying amount of goodwill  
Balance at the beginning of the period 59,569
Foreign currency translation 127
Balance at the end of the period 59,696
Irrigation Segment  
Carrying amount of goodwill  
Balance at the beginning of the period 19,611
Foreign currency translation 113
Balance at the end of the period $ 19,724