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Note 5. Income Taxes (Detail) - Changes in the Valuation Allowance (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2008 | Dec. 31, 2011 Increase Due To Uncertainty Of Recovery [Member] | Dec. 31, 2010 Increase Due To Uncertainty Of Recovery [Member] | Dec. 31, 2010 Decrease Related To Net Recognition Of Deferred Tax Assets [Member] | Dec. 31, 2009 Decrease Related To Net Recognition Of Deferred Tax Assets [Member] | Dec. 31, 2009 Decrease Related To Utilization And Expiration [Member]
Balance at beginning of year |  | $ (19,073) | $ (104,429) | $ (138,848) |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Change In Amount | (88,000) | (71,000) | (77,000) |  | (3,822) | (2,713) | 88,069 | 7,100 | 27,319
Balance at end of year | (19,073) | (22,895) | (19,073) | (138,848) |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Change In Amount | $ (88,000) | $ (71,000) | $ (77,000) |  | $ (3,822) | $ (2,713) | $ 88,069 | $ 7,100 | $ 27,319

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- Definition The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 17 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43-49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition The amount of the change in the period in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e32123-109318 + Details
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