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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 26, 2009
Dec. 31, 2011
MMBtu
Dec. 25, 2010
Natural Gas Price Swap
MMBtu
DERIVATIVE FINANCIAL INSTRUMENTS      
Annual consolidated natural gas purchase requirements (in MMBtu)   900,000  
Quantities of natural gas (in MMBtu)     180,000
Unrealized loss     $ (1)
Recorded losses on foreign currency contracts $ 2,127