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Cash, Cash Equivalents and Investments (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 30, 2012
Jul. 01, 2012
Jul. 01, 2012
Jun. 26, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]          
Short-term investments   $ 59,943,000 $ 59,943,000   $ 144,431,000
Schedule of Available-for-Sale Securities (Textual) [Abstract]          
Gross realized gains on the sale of investments   1,233,000 1,327,000    
Gross realized Loss on the sale of investments   238,000 238,000    
Maximum amount committed to invest in limited partnership     20,500,000    
Investment expiration date     Dec. 31, 2013    
Contribution to limited partnership   19,886,000 19,886,000    
Remaining amount of commitment in limited partnership   614,000 614,000    
Received a stock distribution       371,000  
Recorded an unrealized loss on stock distribution   18,000      
Result in a fair value of stock distribution   353,000 353,000    
Shares were trading investment were sold 352,000        
Corporate bonds [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Short-term investments   18,162,000 18,162,000   55,570,000
Long-term investments   27,897,000 27,897,000   59,902,000
Sovereign Bonds [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Short-term investments         4,016,000
Long-term investments   3,882,000 3,882,000   22,355,000
Germany [Member] | Corporate bonds [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Short-term investments   $ 1,876,000 $ 1,876,000