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Fair Value Of Financial Instruments (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Apr. 08, 2009	Dec. 31, 2011 Senior Convertible Notes Due 2018 [Member]
Fair Value Of Financial Instruments [Line Items]
Amount raised from registered direct offering	$ 31.0
Warrant issued to purchase common stock	5,038,237
Initial exercise price of warrants to purchase common stock, per share	$ 10.46
Carrying value		175.5
Fair value		$ 116.4

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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- Definition

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

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