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Income Taxes (Tax Credits, Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Tax Credit Carryforward [Line Items] |  |  |
Deferred tax assets, realizability, minimum future taxable income | $ 5.7 |  |
Deferred tax assets, realizability, taxable income excluding certain tax deductions | 9.4 | 5.7 | 7.3
Collaborative Arrangement, Therapeutic Discovery Project Credit, Federal Grant |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit utilized |  |  | $ 0.4

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- Definition Deferred Tax Assets, Realizability, Minimum Future Taxable Income Level + References No definition available. + Details
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- Definition Deferred Tax Assets, Realizability, Taxable Income Excluding Certain Tax Deductions + References No definition available. + Details
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- Definition Tax Credit Utilized + References No definition available. + Details
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- Details
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