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Debt (Long-term debt components) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2012
Dec. 30, 2011
Debt Disclosure [Abstract]    
Line of Credit Facility, Amount Outstanding $ 33,000 $ 55,000
Convertible Subordinated Debt 197,782 197,782
Debt Instrument, Unamortized Discount (5,368) (16,832)
Long-term debt $ 225,414 $ 235,950