Common Stock Offering (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	9 Months Ended
	Apr. 11, 2012	Sep. 30, 2012
Common Stock Offering (Textual) [Abstract]
Shares of common stock issued	4,000,000
Common stock issued, price per share	$ 13.00
Additional shares of common stock purchased by underwriters	600,000
Common stock exercise period for underwriters	30 days
Net proceeds from issuance of common stock	$ 56,300	$ 56,565
Additional options granted to underwriters to cover over-allotments	600