Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities
Net income	$ 30,337	$ 35,157
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	85,146	80,663
Equity in net (income) loss from unconsolidated joint ventures	(5,073)	1,560
Distributions of cumulative earnings from unconsolidated joint ventures	6,901	4,408
Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate		(7,260)
Gain on sale of discontinued operations	(1,113)	(6,627)
Loan loss and other investment reserves, net of recoveries		564
Loss on early extinguishment of debt	18,513
Deferred rents receivable	(13,923)	(21,123)
Other non-cash adjustments	(22,115)	5,554
Changes in operating assets and liabilities:
Restricted cash - operations	5,447	(12,771)
Tenant and other receivables	7,409	14
Related party receivables	(3,638)	(3,664)
Deferred lease costs	(4,646)	(7,152)
Other assets	(21,185)	(24,230)
Accounts payable, accrued expenses and other liabilities	869	4,118
Deferred revenue and land leases payable	19,596	7,620
Net cash provided by operating activities	102,525	56,831
Investing Activities
Acquisitions of real estate property	(48,500)	(145,558)
Additions to land, buildings and improvements	(11,617)	(32,561)
Escrowed cash - capital improvements/acquisition deposits	191	(1,533)
Investments in unconsolidated joint ventures	(49,996)	(105,633)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	5,333	16,652
Net proceeds from disposition of real estate/joint venture interest	5,852	23,088
Other investments	(10,146)	(40,016)
Debt and preferred equity and other investments, net of repayments/participations	(65,607)	(8,631)
Net cash used in investing activities	(174,490)	(294,192)
Financing Activities
Proceeds from mortgages and other loans payable	980,333	108,500
Repayments of mortgages and other loans payable	(787,887)	(13,526)
Proceeds from credit facility and senior unsecured notes	155,000	300,000
Repayments of credit facility and senior unsecured notes	(199,960)	(352,454)
Proceeds from stock options exercised and DRIP issuance	4,546	102,089
Net proceeds from sale of common stock/preferred stock	(57)	122,953
Purchases of treasury stock		(11,158)
Distributions to noncontrolling interests in other partnerships	(4,879)	(7,117)
Contributions from noncontrolling interests in other partnerships	3,110	18,331
Distributions to noncontrolling interests in the Operating Partnership	(853)	(762)
Dividends paid on common and preferred stock	(38,591)	(28,453)
Deferred loan costs and capitalized lease obligations	(8,677)	(5,569)
Net cash provided by financing activities	102,085	232,834
Net increase (decrease) in cash and cash equivalents	30,120	(4,527)
Cash and cash equivalents at beginning of period	189,984	138,192
Cash and cash equivalents at end of period	$ 220,104	$ 133,665