Common Stock (Details Textual) (USD $)	0 Months Ended	3 Months Ended								9 Months Ended	12 Months Ended
	Nov. 14, 2011	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Oct. 02, 2012	Sep. 13, 2012	Aug. 08, 2012
Equity, Class of Treasury Stock [Line Items]
Weighted Average Number of Outstanding Shares Basic and Diluted		25,651,000	26,680,000	24,022,500	23,995,000	23,995,000	23,929,000	23,929,000	23,929,000		25,651,220	23,938,406	23,928,784
Tender offer to repurchase shares											$ (26,885,000)
Common Stock (Textual) [Abstract]
Number of shares sold	21,588									5,120,355
Amount of shares sold	200,000										88,886,000	617,000
Sale of shares, per share value							$ 9.26								$ 9.76	$ 9.76
Shares issued under dividend reinvestment plan, shares											82,270	44,980
Stock issued through dividend reinvestment plan											794,000	417,000	0
Stockholder's validity tendered shares accepted on a pro rata basis, percentage											33.00%
Stock repurchase limit		0.05
Oversubscribed amount of offer											26,840,000
Percentage of reimbursement of organization and offering expenses											15.00%
Reimbursement of organization and offering expenses											2,719,000
Reimbursement period for Organization and offering expenses made prior Offer Commencement date											36 months
Dividend Ratio Class E														4.786
Payments of Dividends											7,080,000	2,275,000
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Tender offer to repurchase shares											$ 25,000,000