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Marketable Securities and Equity-Method Affiliates (Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 25, 2011
Jun. 30, 2012
Jun. 25, 2011
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]          
Realized loss on sale of securities, included in other income (expense) $ 0 $ 0 $ 712 $ 0  
Amortized Cost 6,623   6,623   17,331
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses 0   0   (921)
Fair Value 6,623   6,623   16,410
Maturities of debt securities, Amortized Cost          
Due less than one year, Amortized Cost 6,623   6,623   5,359
Due after one year through five years, Amortized Cost 0   0   0
Due after ten years, Amortized Cost 0   0   11,972
Amortized Cost 6,623   6,623   17,331
Maturities of debt securities, Fair Value          
Dus less than one year, Fair Value 6,623   6,623   5,359
Due after one year through five years, Fair Value 0   0   0
Due after ten years, Fair Value 0   0   11,051
Time Deposits [Member]
         
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost 6,623   6,623   5,359
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses 0   0   0
Fair Value 6,623   6,623   5,359
Auction Rate Securities [Member]
         
Schedule of Available-for-sale Securities [Line Items]          
Securities sold for cash     11,260 0  
Amortized Cost 0   0   11,972
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses 0   0   (921)
Fair Value $ 0   $ 0