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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2012
Accumulated Other Comprehensive Income [Abstract] |
Reconciliation Of Amounts Contained In Accumulated Other Comprehensive Income |
|  | Accumulated other comprehensive income |  | Accumulated other comprehensive income, net of tax
As of December 31, 2010 | $ | 929 | $ | 790
Decreases to fair market value of marketable securities during period |  | (295) |  | (251)
Decreases due to realization of a gain on sale of marketable securities |  | (459) |  | (390)
As of December 31, 2011 |  | 175 |  | 149
Increases to fair market value of marketable securities during period |  | 19 |  | 16
Decreases due to realization of a gain on sale of marketable securities |  | (192) |  | (163)
As of December 31, 2012 | $ | 2 | $ | 2

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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