Public Offering of Common Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended			1 Months Ended
	Oct. 31, 2011	Oct. 31, 2012	Jan. 31, 2012	Jun. 30, 2011 Public Offering [Member]
Public Offering of Common Stock (Textual) [Abstract]
Common stock offered		13,763,000	13,556,000	2,300,000
Par value of common stock		$ 0.01	$ 0.01	$ 0.01
Net proceeds to company	$ 31,028			$ 31,000