Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Cash Flows from Operating Activities:
Net Income	$ 181,222		$ 307,579		$ 265,156
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	145,940		150,616		157,665
Amortization of debt deferred costs and intangibles, net	2,650		3,641		(7,518)
Impairment loss	153		1,024		2,815
Equity in earnings of real estate joint ventures and partnerships, net	(19,300)		(22,317)		(35,112)
Gain on sale and acquisition of real estate joint venture and partnership interests	(879)		(1,718)		(33,670)
Gain on sale of property	(59,621)		(190,872)		(119,965)
Distributions of income from real estate joint ventures and partnerships, net	1,216		4,058		3,498
Changes in accrued rent and accounts receivable, net	(8,116)		(3,494)		(4,606)
Changes in unamortized lease costs and other assets, net	(14,617)		(16,299)		(19,587)
Changes in accounts payable, accrued expenses and other liabilities, net	4,184		2,890		18,420
Other, net	11,584		5,661		6,896
Net cash provided by operating activities	244,416		240,769		233,992
Cash Flows from Investing Activities:
Acquisition of real estate and land	(221,779)		(43,587)		(105,765)
Development and capital improvements	(83,702)		(100,926)		(76,992)
Proceeds from sale of property and real estate equity investments, net	101,866		351,224		282,705
Change in restricted deposits and mortgage escrows	76,574		(75,299)		39,505
Notes receivable from real estate joint ventures and partnerships and other receivables - Advances	0		0		(289)
Notes receivable from real estate joint ventures and partnerships and other receivables - Collections	0		10,336		19,411
Real estate joint ventures and partnerships - Investments	(30,053)		(5,223)		(26,241)
Real estate joint ventures and partnerships - Distributions of capital	35,341		31,260		59,932
Purchase of investments	0		(3,000)		(58,836)
Proceeds from investments	1,250		51,788		0
Other, net	(473)		1,504		1,224
Net cash (used in) provided by investing activities	(120,976)		218,077		134,654
Cash Flows from Financing Activities:
Proceeds from issuance of debt	448,083		4,500		573,542
Principal payments of debt	(240,505)		(508,997)		(449,629)
Changes in unsecured credit facilities	(39,500)		189,000		(66,000)
Proceeds from issuance of common shares of beneficial interest, net	42,572		7,987		5,968
Redemption of preferred shares of beneficial interest	(150,000)		0		(275,000)
Common and preferred dividends paid	(174,628)		(199,343)		(165,900)
Debt issuance and extinguishment costs paid	(9,878)		(463)		(6,716)
Distributions to noncontrolling interests	(5,478)		(21,055)		(20,151)
Contributions from noncontrolling interests	1,318		980		106,613
Other, net	3,555		158		599
Net cash used in financing activities	(124,461)		(527,233)		(296,674)
Net (decrease) increase in cash and cash equivalents	(1,021)		(68,387)		71,972
Cash and cash equivalents at January 1	23,189	[1]	91,576		19,604
Cash and cash equivalents at December 31	22,168	[1]	23,189	[1]	91,576
Interest paid during the period (net of amount capitalized of $3,252, $3,302 and $2,403, respectively)	79,580		91,277		106,918
Income taxes paid during the period	$ 1,474		$ 1,705		$ 1,860

[1] Consolidated variable interest entities' assets held as collateral and debt included in the above balances (see Note 21):