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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 30, 2012
Fair Value Disclosures [Abstract]    
Marketable Securities, Restricted, Noncurrent $ 10,860 $ 10,885
Equity Method Investments 111,184 111,516
Other Long-term Investments $ 10,240 $ 14,918