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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended |
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May 31, 2006 | Dec. 31, 2011
Income Taxes [Abstract] |  |
Unrecognized tax positions |  | $ 8.2
State gross margin tax rate | 0.50% |

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- Definition Tax on the company's margin as defined in the law. Margin is calculated as revenues (for federal income tax purposes) less the cost of the products sold (for federal income tax purposes) in the state. + References No definition available. + Details
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- Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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