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PROPERTY, PLANT AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 25, 2010
--- | --- | ---
Property, Plant and Equipment |  |
Property, plant and equipment, at cost | $ 911,642 | $ 865,287
Land and improvements |  |
Property, Plant and Equipment |  |
Property, plant and equipment, at cost | 64,001 | 59,965
Buildings and improvements |  |
Property, Plant and Equipment |  |
Property, plant and equipment, at cost | 229,389 | 219,890
Machinery and equipment |  |
Property, Plant and Equipment |  |
Property, plant and equipment, at cost | 475,292 | 467,466
Transportation equipment |  |
Property, Plant and Equipment |  |
Property, plant and equipment, at cost | 33,927 | 30,156
Office furniture and equipment |  |
Property, Plant and Equipment |  |
Property, plant and equipment, at cost | 75,229 | 70,867
Construction in progress |  |
Property, Plant and Equipment |  |
Property, plant and equipment, at cost | $ 33,804 | $ 16,943

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- Definition Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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