Net Income (Loss) Per Share (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Net (Loss) Income Per Share [Line Items]
Number of shares that could potentially be anti-dilutive if warrants were exercised	13.0
1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member]
Net (Loss) Income Per Share [Line Items]
Notes, interest rate	1.75%
Convertible notes, maturity date	Apr. 15, 2015
Initial conversion price	$ 29.20