Shareholders' Equity (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jan. 21, 2015
Shareholders Equity (Textual)
Discount rate on purchase price under dividend reinvestment plan	95.00%
Series A preferred stock outstanding, shares	3,663,800	3,663,800
Aggregate liquidation preference, value	$ 91,595,000
Preferred stock, par value	$ 0.10	$ 0.10
Annual dividend rate of the Series A preferred stock	8.25%
Annual rate on dividend per share payable quarterly	$ 2.0625
Description of preferred stock dividend	Annual dividend of the Series A Preferred Stock is $2.0625 per share, or 8.25%, of the $25.00 per share liquidation value and is payable quarterly in arrears on March 15, June 15, September 15, and December 15.
Minimum [Member]
Shareholders Equity (Textual)
Amount of optional cash payments	500
Maximum [Member]
Shareholders Equity (Textual)
Amount of optional cash payments	$ 1,000
Subsequent Event [Member]
Shareholders Equity (Textual)
Number of share authorized to repurchase under Share Repurchase Program			10,000,000
Series A Preferred Stock [Member]
Shareholders Equity (Textual)
Preferred stock, par value		$ 0.10
Preferred stock redemption date		May 26, 2016
Description for redemption of preferred stock after redemption date		On and after May 26, 2016, the Series A Preferred Stock will be redeemable at the Company's option for cash, in whole or, from time to time, in part, at a price per share equal to $25.00, plus all accrued and unpaid dividends (whether or not declared) to the date of redemption.
Description for voting right to holders of preferred stock		Holders of the Series A Preferred Stock generally have no voting rights, except if the Company fails to pay dividends for six or more quarterly periods, whether or not consecutive, or with respect to certain specified events.