Shareholders' Equity (Details Textual) (USD $)	1 Months Ended		3 Months Ended	6 Months Ended
	Feb. 28, 2011	Jan. 31, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Shareholders Equity (Textual) [Abstract]
Company authorized to issue shares of preferred stock				20,000,000		20,000,000
Preferred stock, par value				$ 0.01		$ 0.01
Preferred Stock, Shares issued
Public stock offering, shares, including underwriter's overallotment			3,450,000
Proceeds from issuance of common stock, value					$ 91,986,000
Public stock offering transaction costs				$ 267,000
Public stock offering, shares issued		3,000,000
Underwriter's over-allotment number of shares	450,000