Acquisitions and Discontinued Operations Discontinued Operations (Details 2) (USD $) In Thousands	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Mar. 31, 2011 Oak Hollow [Member]	Jun. 30, 2010 Oak Hollow [Member]	Dec. 31, 2010 Pemberton Square [Member]	Jun. 30, 2011 Milford Marketplace [Member]	Dec. 31, 2010 Milford Marketplace [Member]	Dec. 31, 2010 Lakeview Pointe [Member]	Sep. 30, 2011 Secured Line of Credit 3 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price					$ 9,000		$ 1,863		$ 111,835	$ 21,000
Retirement of outstanding debt, including accrued interest					40,281
Gain on extinguishment of debt	0	0	581	0	31,434
Non cash loss on impairment of long lived asset					2,746	25,435		507	12,363	1,302
Net sales price							1,782		110,709	20,631
Gain on discontinued operations							379
Secured credit facility, borrowing capacity	1,145,084		1,145,084								525,000	[1]
Revenues of discontinued operations	$ 39	$ 5,469	$ (450)	$ 14,416

[1] There was an additional $4,870 outstanding on this secured line of credit as of September 30, 2011 for letters of credit. Up to $50,000 of the capacity on this line can be used for letters of credit.