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Fair Value (Tables)
3 Months Ended
Mar. 31, 2012
Fair Value [Abstract]  
Schedule Of Long-Term Investments Measured At Fair Value
(in thousands)   2012     2011  
             
Balance as of January 1   $ 24,673     $ 35,297  
Net unrealized gains included in other comprehensive loss     646       229  
Sales of investments at par value     (25 )     (1,750 )
Balance as of March 31   $ 25,294     $ 33,776  
Unrealized losses still held as of March 31   $ 2,681     $ 3,624