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Marketable Securities and Investments in Limited Partnerships (Investments in Limited Partnerships) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Dec. 28, 2013
Schedule of Equity Method Investments [Line Items]      
Limited partnership, committed contribution $ 35,000    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 13,829    
Proceeds from Equity Method Investment, Dividends or Distributions 6,498    
Income (loss) from investments in limited partnerships 6,104 (90)  
Equity method affiliates, carrying value $ 18,973   $ 17,911
Ownership percentage low range [Member]
     
Schedule of Equity Method Investments [Line Items]      
Limited partnership, ownership (as a percentage) 3.80%    
Ownership percentage high range [Member]
     
Schedule of Equity Method Investments [Line Items]      
Limited partnership, ownership (as a percentage) 12.10%