Investments in Unconsolidated Real Estate Joint Ventures Management, Leasing and Marketing Fees (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Management, Leasing and Marketing Fees [Line Items]
Management and Leasing Fees Paid by Unconsolidated Joint Ventures	$ 469	$ 471	$ 973	$ 935
Marketing Fees Paid by Unconsolidated Joint Venture	44	39	88	80
Total Management, Leasing and Marketing Fees Paid by Unconsolidated Joint Ventures	$ 513	$ 510	$ 1,061	$ 1,015