Shareholders' Equity (Details) - $ / shares	1 Months Ended			3 Months Ended
	Mar. 31, 2019	Feb. 28, 2019	Jan. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred stock, shares authorized	50,000,000			50,000,000	50,000,000
Preferred stock, par value	$ 0.01			$ 0.01	$ 0.01
Preferred stock, shares issued	6,168,062			6,168,062	5,954,594
Preferred Stock, Liquidation Preference Per Share	$ 25.00			$ 25.00
Preferred Stock, Dividend Payment Terms				The Series A Preferred Stock pays a cumulative cash dividend equivalent to 8.50% of the $25.00 liquidation preference per share each year and the Series B Preferred Stock pays a cumulative cash dividend equivalent to 7.625% of the $25.00 liquidation preference per share each year.
Dividends declared per common share	$ 0.06	$ 0.06	$ 0.06
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized	8,000,000			8,000,000
Preferred stock, shares issued	2,300,000			2,300,000	2,300,000
Preferred Stock, Dividend Rate, Percentage				8.50%
Preferred Stock, Dividends Per Share, Declared				$ 0.053125
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized	7,000,000			7,000,000
Preferred stock, shares issued	3,868,062			3,868,062	3,654,594
Preferred Stock, Dividend Rate, Percentage				7.625%
Preferred Stock, Dividends Per Share, Declared				$ 0.4765625
Preferred Stock
Class of Stock [Line Items]
Dividends Payable, Date to be Paid				Apr. 15, 2019
Dividends Payable, Date of Record				Apr. 01, 2019
Common Stock
Class of Stock [Line Items]
Dividends Payable, Date to be Paid	Apr. 01, 2019	Feb. 28, 2019	Jan. 31, 2019
Dividends Payable, Date of Record	Mar. 22, 2019	Feb. 14, 2019	Jan. 18, 2019