Fees, expenses and revenue paid to advisor (dollars in thousands) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fees, expenses and revenue paid to advisor
Advisory fees to advisor	$ 8,494	$ 8,915	$ 9,958
Construction advisory fees to advisor		181	2,429
Mortgage brokerage and equity refinancing fees to advisor	1,878	1,873	812
Net income fees to advisor	4,089	180	54
Property acquisition fees to advisor		20
Total Fees to advisor	14,461	11,169	13,253
Cost reimbursements to advisor	2,585	2,247	2,908
Interest paid to advisor	157	1,194	1,048
Total other expenses to advisor	2,742	3,441	3,956
Rental Revenue from advisor	$ 670	$ 587	$ 434