Real Estate Transactions (Acquisitions of Properties) (Details)		6 Months Ended
		Jun. 30, 2015 USD ($) Properties	Dec. 31, 2014 USD ($)
Real Estate Properties [Line Items]
Promissory note issued for property acquired	[1]	$ 108,615,615	$ 106,966,774
Residential Properties [Member]
Real Estate Properties [Line Items]
Number of properties | Properties		63
Residential Properties [Member] | Seventeen Dubos Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Properties		17
Purchase price of property acquired		$ 5,700,000
Cash payment for the properties acquired		2,300,000
Promissory note issued for property acquired		3,400,000
Allocated Purchase Price of Properties Acquired [Abstract]
Land		797,000
Buildings and other		4,923,000
Total purchase price		$ 5,720,000

[1] Each Model Home has a standalone mortgage note at interest rates ranging from 4.9% to 5.8% (at June 30, 2015).