Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Cash Flows from Operating Activities:
Net Income	$ 64,781		$ 44,817
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	40,884		39,731
Amortization of debt deferred costs and intangibles, net	243		(9,300)
Impairment loss	0		292
Equity in earnings of real estate joint ventures and partnerships, net	(4,402)		(4,613)
Gain on sale and acquisition of real estate joint venture and partnership interests	0		(11,509)
Gain on sale of property	(41,375)		(142)
Distributions of income from real estate joint ventures and partnerships, net	261		976
Changes in accrued rent and accounts receivable, net	5,013		8,256
Changes in other assets, net	(885)		(3,234)
Changes in accounts payable, accrued expenses and other liabilities, net	(23,476)		(30,232)
Other, net	302		2,599
Net cash provided by operating activities	41,346		37,641
Cash Flows from Investing Activities:
Acquisition of real estate and land	0		(18,880)
Development and capital improvements	(14,494)		(14,101)
Proceeds from sale of property and real estate equity investments, net	46,177		3,914
Change in restricted deposits and mortgage escrows	1,002		561
Notes receivable from real estate joint ventures and partnerships and other receivables - Collections	3,840		3,937
Real estate joint ventures and partnerships - Investments	(752)		(240)
Real estate joint ventures and partnerships - Distribution of capital	5,539		14,393
Proceeds from investments	50,038		0
Other, net	(10,713)		0
Net cash provided by (used in) investing activities	80,637		(10,416)
Cash Flows from Financing Activities:
Proceeds from issuance of debt	0		298,584
Principal payments of debt	(319,812)		(101,643)
Changes in unsecured credit facilities	159,900		(66,000)
Proceeds from issuance of common shares of beneficial interest, net	229		1,887
Repurchase of preferred shares of beneficial interest	0		(75,000)
Common and preferred dividends paid	(42,141)		(44,122)
Debt issuance costs paid	(204)		(2,100)
Distributions to noncontrolling interests	(2,351)		(3,858)
Other, net	19		223
Net cash (used in) provided by financing activities	(204,360)		7,971
Net (decrease) increase in cash and cash equivalents	(82,377)		35,196
Cash and cash equivalents at January 1	91,576	[1]	19,604
Cash and cash equivalents at March 31	9,199	[1]	54,800
Interest paid during the period (net of amount capitalized of $660 and $569, respectively)	26,616		35,794
Income taxes paid during the period	$ 0		$ 0

[1] Consolidated variable interest entities' assets held as collateral and debt included in the above balances (see Note 16):