Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Loss	$ (9,311)	$ (4,477)
Adjustments to Reconcile Net Loss to Net Cash Provided by Operating Activities:
Depreciation	51,881	43,953
Amortization of Deferred Financing Costs	1,725	2,162
Other Amortization	15,981	17,363
Impairment of Real Estate, Net	1,246	(4,823)
Provision for Bad Debt	591	563
Mark-to-Market Loss on Interest Rate Protection Agreements	305	188
Loss from Retirement of Debt	6,222	4,259
Prepayment Penalties and Fees Associated with Retirement of Debt	(440)	(1,268)
Equity in Income of Joint Ventures	(128)	(135)
Distributions from Joint Venture	27	161
Gain on Sale of Real Estate	(7,585)	(7,341)
Gain on Change in Control of Interests	(776)	(689)
Decrease in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net	3,506	866
Increase in Deferred Rent Receivable	(1,614)	(4,341)
Increase (Decrease) in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits	1,534	(8,765)
Decrease in Restricted Cash		101
Payments of Premiums and Discounts Associated with Senior Unsecured Notes	(2,847)	(27)
Net Cash Provided by Operating Activities	60,317	37,750
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of and Additions to Investment in Real Estate and Lease Costs	(93,812)	(37,952)
Net Proceeds from Sales of Investments in Real Estate	23,116	28,472
Contributions to and Investments in Joint Ventures	(184)	(16)
Distributions from Joint Ventures		108
Repayments of Notes Receivable	8,306	10,049
Decrease in Lender Escrows		88
Net Cash (Used In) Provided by Investing Activities	(62,574)	749
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt and Equity Issuance Costs	(287)	(2,258)
Proceeds from the Issuance of Common Stock, Net of Underwriter's Discount	18,063	202,845
Repurchase and Retirement of Restricted Stock	(855)	(1,001)
Preferred Dividends	(9,525)	(9,874)
Payments on Interest Rate Swap Agreement	(572)	(292)
Proceeds from Origination of Mortgage Loans Payable		178,300
Repayments on Mortgage and Other Loans Payable	(18,273)	(64,198)
Repayments on Senior Unsecured Notes	(148,310)	(56,419)
Proceeds from Unsecured Credit Facility	241,000	101,500
Repayments on Unsecured Credit Facility	(84,000)	(378,553)
Net Cash Used in Financing Activities	(2,759)	(29,950)
Net Effect of Exchange Rate Changes on Cash and Cash Equivalents	(1)	36
Net (Decrease) Increase in Cash and Cash Equivalents	(5,016)	8,549
Cash and Cash Equivalents, Beginning of Period	10,153	25,963
Cash and Cash Equivalents, End of Period	$ 5,136	$ 34,548