Preferred Stock (Series C Preferred Stock) (Narrative) (Details) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Mar. 16, 2016 USD ($)	Feb. 29, 2012 $ / shares item shares	Dec. 31, 2017 $ / shares shares
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Number of closings for sale of preferred stock | item		2
Preferred stock, shares issued and sold | shares		3,000,000
Preferred stock, liquidation preference per share		$ 10.00
Number of shares issued for each convertible preferred stock | shares			0.9615385
Percentage of voting stock			34.00%
Preferred stock, fixed annual amount of dividend per share			$ 0.625
Preferred stock, annual dividend rate			6.25%
Preferred stock, voting rights per share			$ 0.12096
Preferred stock, deemed dividend | $	$ 20,366
Preferred stock dividends, adjustment to net earnings attributable to common shareholders | $	$ 15,873
Real Estate Strategies, L.P. [Member]
Class of Stock [Line Items]
Percentage of voting stock	49.00%