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Accumulated Other Comprehensive Income
9 Months Ended
Sep. 30, 2011
Accumulated Other Comprehensive Income [Abstract] 
Accumulated Other Comprehensive Income
15.           Accumulated Other Comprehensive Income

A reconciliation of the amounts contained in accumulated other comprehensive income is as follows:

   
Accumulated other comprehensive
income
 
As of December 31, 2010
 $929 
      
Unrealized gain on marketable securities
  276 
Realized gain on marketable securities
  (366)
      
As of March 31, 2011
 $839 
      
Unrealized loss on marketable securities
  (403)
Realized gain on marketable securities
  (81)
      
As of June 30, 2011
 $355 
      
Unrealized loss on marketable securities
  (319)
Realized loss on marketable securities
  2 
      
As of September 30, 2011
 $38