Subsequent Events (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Subsequent Events (Textual) [Abstract]
Number of additional shares elected to exercise by underwriters	687,385
Date of completion of sale of additional shares	January 8, 2013
Proceeds from over allotment net of underwriting discounts and commission and offering expenses	$ 4.1