Debt, Extinguishment (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Extinguishment of Debt [Line Items]
Stated Interest Rate Percentage - Debt Instruments	3.75%
Maturity Date - Debt Instrument	Jan. 15, 2034
First Conversion Date	Jan. 15, 2009
Number of Notes Converted	4,471
Cash Payments for Debt Conversions (in millions)	$ 7.1
Deferred Tax Liability (in millions)	0.4
Per Note Conversion Price	$ 471
Excess above Principal Note Amount (in millions)	$ 25
If converted, issuance of common stock shares	190,306