CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income (Loss)	$ 19,002	$ (115)
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities:
Depreciation	70,398	75,888
Amortization of Deferred Financing Costs	2,468	2,593
Other Amortization	22,613	23,903
Impairment of Real Estate	2,652	1,246
Provision for Bad Debt	666	667
Equity in Income of Joint Ventures	(119)	(156)
Distributions from Joint Ventures	0	27
Gain on Sale of Real Estate	(16,203)	(15,782)
Gain on Change in Control of Interests	0	(776)
Loss from Retirement of Debt	6,248	6,646
Mark-to-Market (Gain) Loss on Interest Rate Protection Agreements	(52)	334
(Increase) Decrease in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net	(4,250)	1,609
Increase in Deferred Rent Receivable	(3,321)	(2,384)
(Decrease) Increase in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits	(9,868)	1,190
Payments of Premiums, Discounts and Prepayment Penalties Associated with Retirement of Debt	(4,672)	(4,059)
Net Cash Provided by Operating Activities	85,562	90,831
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate	(47,293)	(55,406)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs	(85,168)	(57,626)
Net Proceeds from Sales of Investments in Real Estate	65,814	77,944
Contributions to and Investments in Joint Ventures	(26)	(184)
Repayments of Notes Receivable	454	14,226
Decrease in Escrows	979	0
Net Cash Used in Investing Activities	(65,240)	(21,046)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt and Equity Issuance Costs	(3,567)	(1,465)
Proceeds from the Issuance of Common Stock, Net of Underwriter’s Discount	174,081	134,905
Repurchase and Retirement of Restricted Stock	(2,968)	(855)
Common Stock and Unit Distributions	(19,286)	0
Preferred Dividends Paid	(7,958)	(13,871)
Redemption of Preferred Stock	(150,000)	0
Payments on Interest Rate Swap Agreement	(865)	(819)
Proceeds from Origination of Mortgage Loans Payable	0	100,599
Repayments on Mortgage and Other Loans Payable	(50,565)	(21,468)
Repayments of Senior Unsecured Notes	(29,769)	(152,170)
Proceeds from Unsecured Credit Facility	289,000	261,000
Repayments on Unsecured Credit Facility	(216,000)	(383,000)
Net Cash Used in Financing Activities	(17,897)	(77,144)
Net Effect of Exchange Rate Changes on Cash and Cash Equivalents	(20)	14
Net Increase (Decrease) in Cash and Cash Equivalents	2,425	(7,359)
Cash and Cash Equivalents, Beginning of Year	4,938	10,153
Cash and Cash Equivalents, End of Year	$ 7,343	$ 2,808