ACQUISITIONS (Details 2) (Valmont SM, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2014
Major classes of acquired intangible assets and weighted-average amortization periods
Amount	$ 30,340
Backlog
Major classes of acquired intangible assets and weighted-average amortization periods
Amount	3,145
Weighted Average Amortization Period	1 year 6 months
Customer Relationships
Major classes of acquired intangible assets and weighted-average amortization periods
Amount	14,985
Weighted Average Amortization Period	15 years
Trade Names
Major classes of acquired intangible assets and weighted-average amortization periods
Amount	$ 12,210