Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Cash Flows from Operating Activities:
Net Income	$ 49,222		$ 64,781
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	36,151		40,884
Amortization of debt deferred costs and intangibles, net	656		243
Equity in earnings of real estate joint ventures and partnerships, net	(5,372)		(4,402)
Gain on sale and acquisition of real estate joint venture and partnership interests	(861)		0
Gain on sale of property	(22,522)		(41,375)
Distributions of income from real estate joint ventures and partnerships, net	1,024		261
Changes in accrued rent and accounts receivable, net	6,951		5,013
Changes in unamortized debt and lease costs and other assets, net	(1,994)		(885)
Changes in accounts payable, accrued expenses and other liabilities, net	(14,762)		(23,476)
Other, net	8,947		302
Net cash provided by operating activities	57,440		41,346
Cash Flows from Investing Activities:
Acquisition of real estate and land	(91,487)		0
Development and capital improvements	(17,401)		(14,494)
Proceeds from sale of property and real estate equity investments, net	33,050		46,177
Change in restricted deposits and mortgage escrows	51,357		1,002
Notes receivable from real estate joint ventures and partnerships and other receivables - Collections	61		3,840
Real estate joint ventures and partnerships - Investments	(34)		(752)
Real estate joint ventures and partnerships - Distribution of capital	4,446		5,539
Proceeds from investments	500		50,038
Other, net	(535)		(10,713)
Net cash (used in) provided by investing activities	(20,043)		80,637
Cash Flows from Financing Activities:
Proceeds from issuance of debt	200,000		0
Principal payments of debt	(112,236)		(319,812)
Changes in unsecured credit facilities	(85,000)		159,900
Proceeds from issuance of common shares of beneficial interest, net	30,863		229
Common and preferred dividends paid	(44,914)		(42,141)
Debt issuance and extinguishment costs paid	(7,402)		(204)
Distributions to noncontrolling interests	(1,660)		(2,351)
Other, net	(69)		19
Net cash used in financing activities	(20,418)		(204,360)
Net increase (decrease) in cash and cash equivalents	16,979		(82,377)
Cash and cash equivalents at January 1	23,189	[1]	91,576
Cash and cash equivalents at March 31	40,168	[1]	9,199
Interest paid during the period (net of amount capitalized of $831 and $660, respectively)	$ 23,471		$ 26,616

[1] Consolidated variable interest entities' assets held as collateral and debt included in the above balances (see Note 15):