Debt (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Mortgage Loans Payable
Interest rate, description	LIBOR plus 3%
Mortgage loans payable	$ 238,097	$ 230,940
Amherst, NY [Member] | Five Point Six Five Percent Loans Due October Two Thousand and Thirteen [Member]
Mortgage Loans Payable
Maturity	Oct 2013
Interest rate, description
Interest rate	5.65%
Mortgage loans payable	15,343	15,682
Memphis, TN [Member] | Two point seven one percent loans due august two thousand and fourteen [Member]
Mortgage Loans Payable
Maturity	Aug 2014
Interest rate, description	Libor+2.5%
Interest rate	2.71%
Mortgage loans payable	13,478
Meriden, CT & Lisle, IL [Member] | Two point seven one percent loans due october two thousand and fourteen [Member]
Mortgage Loans Payable
Maturity	Oct 2014
Interest rate, description	Libor+2.5%
Interest rate	2.71%
Mortgage loans payable	21,000	21,000
Chicago, IL [Member] | Five Point Five Percent Loans Due April Two Thousand and Fifteen [Member]
Mortgage Loans Payable
Maturity	Apr 2015
Interest rate, description
Interest rate	5.50%
Mortgage loans payable	8,700	8,900
Chicago, IL [Member] | Five Point Seven Five Percent Loan Due March Two Thousand Sixteen [Member]
Mortgage Loans Payable
Maturity	Mar 2016
Interest rate, description
Interest rate	5.75%
Mortgage loans payable	20,281	20,522
Indianapolis, IN [Member] | Five Point Eight Two Percent Loan Due April Two Thousand Fifteen [Member]
Mortgage Loans Payable
Maturity	Apr 2015
Interest rate, description
Interest rate
Mortgage loans payable		4,169
Houston, TX [Member] | Six Point Two One Percent Due April Two Thousand Sixteen [Member]
Mortgage Loans Payable
Maturity	Apr 2016
Interest rate, description
Interest rate	6.18%
Mortgage loans payable	53,187	56,423
New York, NY [Member] | Three Point Five Percent Due May Two Thousand Sixteen [Member]
Mortgage Loans Payable
Maturity	May 2016
Interest rate, description	Libor+2.5%
Interest rate	3.50%
Mortgage loans payable	51,982	49,585
Lisle, IL [Member] | Five Point Five Five Percent Loans Due March Two Thousand Seventeen [Member]
Mortgage Loans Payable
Maturity	Mar 2017
Interest rate, description
Interest rate	5.55%
Mortgage loans payable	5,560	5,600
Orlando, FL [Member] | Six Point Four Zero Percent Loans Due July Two Thousand Seventeen [Member]
Mortgage Loans Payable
Maturity	Jul 2017
Interest rate, description
Interest rate	6.40%
Mortgage loans payable	37,725	38,132
Plantation, FL [Member] | Six Point Four Eight Percent Loans Due April Two Thousand Eighteen [Member]
Mortgage Loans Payable
Maturity	Apr 2018
Interest rate, description
Interest rate	6.48%
Mortgage loans payable	$ 10,841	$ 10,927