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3.25% Cash Convertible Senior Notes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Debt Instrument [Line Items]
Debt Instrument, Convertible, Terms of Conversion Feature	During the period from March 1, 2014 to May 30, 2014, and under certain additional limited circumstances, the 3.25% Notes are cash convertible by holders thereof (the "Cash Conversion Option"). The conversion rate was 64.6669 shares of our common stock (which represents a conversion price of approximately $15.46 per share) for the period from March 17, 2014 through March 21, 2014, and 65.3501 shares of our common stock (which represents a conversion price of approximately $15.30 per share), as adjusted for the dividend paid on April 2, 2014, for the period from April 2, 2014 to May 30, 2014. We will not deliver common stock (or any other securities) upon conversion under any circumstances.
3.25% Cash Convertible Senior Notes due 2014
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jun. 01, 2014
3.25% Cash Convertible Senior Notes due 2014 \| Forecasted In 2014 [Member]
Debt Instrument [Line Items]
Expected Accretion Of Debt Discount	$ 6
Warrants [Member]
Debt Instrument [Line Items]
Option Indexed to Issuer's Equity, Strike Price	21.24

Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature.

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