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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