Net Income (Loss) Per Share (Narrative) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Anti-dilutive shares	7.2	8.0	8.3
Convertible Notes Payable
Anti-dilutive shares	3.0	3.0	4.7
Stock Options Restricted Stock And Restricted Stock Units
Anti-dilutive shares	4.1	5.0	3.6