Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Tenant and other receivables, allowance for doubtful accounts (in US dollars)	$ 12,456	$ 12,210
Receivable arising from the straight-lining of rents, allowance (in US dollars)	3,083	3,188
Deferred leasing and financing costs, accumulated amortization (in US dollars)	289,589	281,109
Identified intangible assets, accumulated amortization (in US dollars)	$ 200,330	$ 199,821
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Preferred Stock, Par Value Per Share	$ 0us-gaap_PreferredStockNoParValue	$ 0us-gaap_PreferredStockNoParValue
Preferred shares of beneficial interest: authorized shares	110,000,000us-gaap_PreferredStockSharesAuthorized	110,000,000us-gaap_PreferredStockSharesAuthorized
Preferred shares of beneficial interest: issued shares	52,678,939us-gaap_PreferredStockSharesIssued	52,678,939us-gaap_PreferredStockSharesIssued
Preferred shares of beneficial interest: outstanding shares	52,678,939us-gaap_PreferredStockSharesOutstanding	52,678,939us-gaap_PreferredStockSharesOutstanding
Common shares of beneficial interest: par value per share (in dollars per share)	$ 0.04	$ 0.04
Common shares of beneficial interest: authorized shares	250,000,000us-gaap_CommonStockSharesAuthorized	250,000,000us-gaap_CommonStockSharesAuthorized
Common shares of beneficial interest: issued shares	188,272,702us-gaap_CommonStockSharesIssued	187,887,498us-gaap_CommonStockSharesIssued
Common shares of beneficial interest: outstanding shares	188,272,702us-gaap_CommonStockSharesOutstanding	187,887,498us-gaap_CommonStockSharesOutstanding
Common Class A [Member]
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	11,640,982	11,356,550
Cumulative Redeemable Preferred Unit [Member]
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	1	1

The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

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