Investment in Unconsolidated Entities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		3 Months Ended				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Total Unconsolidated Grove Entities [Member]	Mar. 31, 2013 Cb Portfolio [Member]		Sep. 30, 2013 Cb Portfolio [Member]	Mar. 31, 2013 HSRE Campus Crest I LLC [Member]		Mar. 31, 2013 HSRE Campus Crest IV LLC [Member]		Mar. 31, 2013 HSRE Campus Crest V LLC [Member]		Mar. 31, 2013 HSRE Campus Crest VI LLC [Member]		Mar. 31, 2013 HSRE Campus Crest IX LLC [Member]	Mar. 31, 2013 HSRE Campus Crest X LLC [Member]
Our Ownership				25.30%		48.00%	49.90%		20.00%		10.00%		20.00%		30.00%	30.00%
Year Founded				2013			2009		2011		2011		2012		2013	2013
Number of Properties, In Operations	40		7	33			3		1		3		0		0	0
Number of Properties, Under Operations	8		6	2			0		0		0		3		1	2
Total Investment	$ 165,688	$ 22,555	$ 35,097	$ 130,591			$ 10,823		$ 2,285		$ 3,296		$ 6,872		$ 5,443	$ 6,378
Construction Loan	$ 612,074		$ 96,874	$ 515,200			$ 33,532		$ 16,979		$ 45,670		$ 693		$ 0	$ 0
Debt, Weighted Average Interest Rate	5.27%		3.36%	5.65%	[1]		2.70%	[2]	5.75%	[3]	2.96%	[2]	2.85%	[2]
Debt, Maturity Start Date				Jun. 01, 2013			Nov. 09, 2013				Dec. 20, 2014		May 08, 2015
Debt, Maturity End Date				Oct. 01, 2020			Jan. 09, 2014				Jan. 05, 2015		Dec. 19, 2015
Maturity Date									Dec. 01, 2013

[1] At March 31, 2013, our effective interest in the CB Portfolio was 25.3%. We will continue to close on our 48.0% interest, anticipating completion by the third quarter of 2013, in each remaining property at such time as we obtain the requisite lender consent relating thereto.

[2] Variable interest rates.

[3] Comprised of one fixed rate loan.