Investment in Unconsolidated Entities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Dec. 31, 2011
Number of Properties	10
Total Investment	$ 23,093		$ 21,052
Construction debt	106,144		82,719
Debt, Weighted Average Interest Rate	3.56%
HSRE Campus Crest I LLC [Member]
Our Ownership	49.90%
Number of Properties	4	[1]
Total Investment	14,754
Construction debt	48,304
Debt, Weighted Average Interest Rate	2.74%	[2]
Debt, Maturity Start Date	Nov. 09, 2012
Debt, Maturity End Date	Jan. 09, 2013
HSRE Campus Crest IV LLC [Member]
Our Ownership	20.00%
Number of Properties	2
Total Investment	4,602
Construction debt	30,075
Debt, Weighted Average Interest Rate	5.42%	[2],[3]
Debt, Maturity Start Date	Oct. 31, 2013
Debt, Maturity End Date	Dec. 01, 2013
HSRE Campus Crest V LLC [Member]
Our Ownership	10.00%
Number of Properties	3	[1]
Total Investment	3,089
Construction debt	27,765
Debt, Weighted Average Interest Rate	2.96%	[2]
Debt, Maturity Start Date	Dec. 20, 2014
Debt, Maturity End Date	Jan. 05, 2015
HSRE Campus Crest VI LLC [Member]
Our Ownership	20.00%
Number of Properties	1
Total Investment	648
Construction debt	$ 0
Debt, Weighted Average Interest Rate	0.00%	[2],[4]
Debt, Maturity Start Date	May 08, 2015

[1] In July 2012, we acquired 100% of the interests in The Grove at Moscow from HSRE-Campus Crest I, LLC and The Grove at Valdosta from HSRE-Campus Crest IV, LLC (see Note 13).

[2] (1)Variable interest rate(s), except where otherwise noted.

[3] Comprised of one fixed rate loan and one variable rate loan.

[4] 4) Interest rate as of June 30, 2012 not applicable as the outstanding loan balance was zero.