GOODWILL AND INTANGIBLE ASSETS (Details 3) $ in Thousands	6 Months Ended
	Jun. 27, 2015 USD ($)
Carrying amount of goodwill
Balance at the beginning of the period	$ 385,111
Impairment	(1,737)
Foreign currency translation	(3,288)
Balance at the end of the period	380,086
Engineered Infrastructure Products segment:
Carrying amount of goodwill
Balance at the beginning of the period	197,074
Impairment	(1,737)
Foreign currency translation	(2,789)
Balance at the end of the period	192,548
Utility Support Structures segment
Carrying amount of goodwill
Balance at the beginning of the period	75,404
Balance at the end of the period	75,404
Coatings segment
Carrying amount of goodwill
Balance at the beginning of the period	74,862
Foreign currency translation	(634)
Balance at the end of the period	74,228
Irrigation segment
Carrying amount of goodwill
Balance at the beginning of the period	19,536
Foreign currency translation	(78)
Balance at the end of the period	19,458
Other/Corporate
Carrying amount of goodwill
Balance at the beginning of the period	18,235
Foreign currency translation	213
Balance at the end of the period	$ 18,448