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12/31/2009
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 12
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 10
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 4, 17
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12/31/2010
USD ($)
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12/31/2009
USD ($)
$I2009_FairValueInputsLevel3Memberhttp://www.sec.gov/CIK0000018230instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$30falsefalseUSDtruefalse{us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Level 3
12/31/2008
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 4, 58, 59
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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-Name Statement of Financial Accounting Standard (FAS)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
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