Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Cash Flows from Operating Activities:
Net Income	$ 265,156		$ 152,421		$ 16,739
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	157,665		148,413		157,290
Amortization of debt deferred costs and intangibles, net	(7,518)		(1,162)		5,215
Impairment loss	2,815		15,436		75,874
Equity in (earnings) losses of real estate joint ventures and partnerships, net	(35,112)		1,558		(7,834)
Gain on acquisition	0		(1,869)		(4,559)
Gain on sale and acquisition of real estate joint venture and partnership interests	(33,670)		(14,203)		0
Gain on sale of property	(119,965)		(69,623)		(11,952)
Distributions of income from real estate joint ventures and partnerships, net	3,498		3,141		2,186
Changes in accrued rent and accounts receivable, net	(4,606)		82		6,662
Changes in other assets, net	(19,587)		(19,008)		(22,482)
Changes in accounts payable, accrued expenses and other liabilities, net	18,420		(878)		(13,525)
Other, net	6,896		13,022		11,117
Net cash provided by operating activities	233,992		227,330		214,731
Cash Flows from Investing Activities:
Acquisition of real estate and land	(105,765)		(198,171)		(49,880)
Development and capital improvements	(76,992)		(95,743)		(94,108)
Proceeds from sale of property and real estate equity investments, net	282,705		591,091		113,043
Change in restricted deposits and mortgage escrows	39,505		(30,520)		(794)
Notes receivable from real estate joint ventures and partnerships and other receivables - Advances	(289)		(6,614)		(2,926)
Notes receivable from real estate joint ventures and partnerships and other receivables - Collections	19,411		75,081		15,687
Real estate joint ventures and partnerships - Investments	(26,241)		(9,792)		(18,583)
Real estate joint ventures and partnerships - Distributions of capital	59,932		44,976		17,271
Proceeds from tax increment revenue bonds	0		0		16,545
Purchase of investments	(58,836)		0		0
Other, net	1,224		0		0
Net cash provided by (used in) investing activities	134,654		370,308		(3,745)
Cash Flows from Financing Activities:
Proceeds from issuance of debt	573,542		300,098		215,750
Principal payments of debt	(449,629)		(538,438)		(336,760)
Changes in unsecured credit facilities	(66,000)		(100,500)		86,500
Proceeds from issuance of common shares of beneficial interest, net	5,968		8,267		3,999
Repurchase of preferred shares of beneficial interest	(275,000)		(72,500)		0
Common and preferred dividends paid	(165,900)		(173,202)		(165,721)
Debt issuance costs paid	(6,716)		(4,250)		(4,002)
Distributions to noncontrolling interests	(20,151)		(12,770)		(23,560)
Contributions from noncontrolling interests	106,613		2,123		3,717
Other, net	599		(504)		(1,126)
Net cash used in financing activities	(296,674)		(591,676)		(221,203)
Net increase (decrease) in cash and cash equivalents	71,972		5,962		(10,217)
Cash and cash equivalents at January 1	19,604	[1]	13,642		23,859
Cash and cash equivalents at December 31	91,576	[1]	19,604	[1]	13,642
Interest paid during the period (net of amount capitalized of $2,403, $3,125 and $2,329, respectively)	106,918		117,085		137,758
Income taxes paid during the period	$ 1,860		$ 1,548		$ 1,578

[1] * Consolidated variable interest entities' assets held as collateral and debt included in the above balances (see Note 22):