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Debt (Details) (Senior Subordinated Convertible Notes [Member], USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
NotesConverted
Senior Subordinated Convertible Notes [Member]
 
Debt Instrument [Line Items]  
Stated Interest Rate Percentage - Debt Instruments (in hundredths) 3.75%
Maturity year of Senior subordinated convertible notes 2034
First Conversion Date Jan. 15, 2009
Number of Notes Converted 1,178
Cash Payments for Debt Conversions (in millions) $ 2.1
Deferred Tax Liability (in millions) 0.12
Per Note Conversion Price (in dollars per share) $ 488.37
Principal note amount (in millions) 8
Excess above Principal Note Amount (in millions) $ 22
If converted, issuance of common stock shares (in shares) 151,922