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Accumulated Other Comprehensive Income
12 Months Ended
Dec. 31, 2011
Accumulated Other Comprehensive Income [Abstract]  
Accumulated Other Comprehensive Income

13. Accumulated Other Comprehensive Income

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

   
Accumulated other
comprehensive
income
  
Accumulated other
comprehensive
income, net of tax
 
As of December 31, 2008
 $5,413  $4,603 
Increases to fair market value during period
  2,092   1,778 
Decreases due to realization of a gain
  (6,829)  (5,806)
As of December 31, 2009
 $676  $575 
Increases to fair market value during period
  534   467 
Decreases due to realization of a gain
  (281)  (246)
As of December 31, 2010
 $929  $796 
Decreases to fair market value during period
  (295)  (251)
Decreases due to realization of a gain
  (459)  (390)
As of December 31, 2011
 $175  $155