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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Fair Value Measurements
Changes In Level 3 Financial Instruments
                                 
    Three Months Ended     Nine Months Ended  
    September 30     September 30  
    2011     2010     2011     2010  
Balance at beginning of period
  $ —     $ 750     $ —     $ 41,847  
Sales
    —       (750 )     —       (41,414 )
Total gains or (losses):
                               
Realized losses included in other income (expense), net
    —       —       —       (561 )
Changes in net unrealized gain (losses) included in other comprehensive income
    —       —       —       128  
 
                       
Balance at end of period
  $ —     $ —     $ —     $ —