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Fair-Value Measurements (Tables)
6 Months Ended
Jun. 30, 2011
Fair-Value Measurements  
Summary Of Valuation Of Financial Instruments At Fair-Value
   
June 30, 2011
 
(Dollars in thousands)
 
Total
   
Level 1
   
Level 2
   
Level 3
 
                         
Cash equivalents
  $ 438,033     $ 105,800     $ 332,233     $ --  
Other marketable securities
    5,774       --       --       5,774  

   
December 31, 2010
 
(Dollars in thousands)
 
Total
   
Level 1
   
Level 2
   
Level 3
 
                         
Cash equivalents
  $ 388,053     $ 118,763     $ 269,290     $ --  
Other marketable securities
    6,039       --       --       6,039  
Changes In Fair Values Of Auction-Rate Security
       
(Dollars in thousands)
 
Auction-rate security
 
Balance at December 31, 2009
  $ 6,691  
Unrealized gain
    48  
Partial redemption
    (700 )
Balance at December 31, 2010
  $ 6,039  
Unrealized gain
    35  
Partial redemption
    (300 )
Balance at June 30, 2011
  $ 5,774