Convertible Debentures (Textual) (Details) (USD $)	1 Months Ended	12 Months Ended
	Feb. 28, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 20, 2005
Convertible Debentures Disclosure [Abstract]
Debentures, principal amount					$ 25,000,000
Conversion of principal into shares of common stock	8,300,000		8,333,000	0
Conversion of principal into shares of common stock, shares	514,086		514,000	0
Debentures converted into common stock, conversion price per share	$ 16.21
Common stock fair value on the date of conversion of debentures	9,300,000	0	9,341,000	0
Gain (loss) on embedded derivatives and warrants, conversion	1,000,000
Restricted cash	8,000,000
Number of trading days	20 days
Gain (loss) on embedded derivatives and warrants, fair value measurement			$ 78,000	$ 2,300,000