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Investment Income, Net (Tables)
 6 Months Ended
Jun. 30, 2011
Investment Income, Net  
Schedule Of Investment Income, Net
     Three Months Ended
June 30,		      Six Months Ended
June 30,		  
     2011      2010      2011      2010  
     (In thousands)  

Interest and dividend income from cash, cash equivalents and investments

    $ 38       $ 31       $ 68       $ 49