PROPERTY, PLANT AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 994,774	$ 911,642
Land and improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	73,713	64,001
Buildings and improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	254,171	229,389
Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, at cost	519,212	475,292
Transportation equipment
Property, Plant and Equipment
Property, plant and equipment, at cost	37,205	33,927
Office furniture and equipment
Property, Plant and Equipment
Property, plant and equipment, at cost	72,728	75,229
Construction in progress
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 37,745	$ 33,804