Real Estate Joint Venture, Acquisitions, and Disposition Activity (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Preston Royal Village
Business Acquisition [Line Items]
Total revenues		$ 1,655		$ 3,310
Net income available to stockholders		(1,029)		(1,371)
Fountain Oaks
Business Acquisition [Line Items]
Total revenues		604		1,208
Net income available to stockholders		(161)		(197)
Historical Results
Business Acquisition [Line Items]
Total revenues	10,784	861	22,701	19,921
Net income available to stockholders	981	1,446	9,377	2,703
Historical Results
Business Acquisition [Line Items]
Total revenues	11,388	12,120	23,909	24,439
Net income available to stockholders	1,103	256	9,495	1,135
Pro Forma Adjustments to Historical Results
Business Acquisition [Line Items]
Total revenues	604		1,208
Net income available to stockholders	$ 122		$ 118