Convertible Preferred Stock (Details) (USD $)	Sep. 30, 2013
Convertible Preferred Stock [Abstract]
Convertible Preferred Stock, Interest Rate, Stated Percentage	5.25%
Convertible Preferred Stock, Prior Conversion Ratio	77.1251
Convertible Preferred Stock, Current Conversion Ratio	77.8966
Convertible Preferred Stock, Prior Conversion Price	$ 12.97
Convertible Preferred Stock, Current Conversion Price	$ 12.84