Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities:
Net Income	$ 132,196	$ 203,964
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	108,929	114,208
Amortization of debt deferred costs and intangibles, net	1,974	2,952
Impairment loss	153	0
Equity in earnings of real estate joint ventures and partnerships, net	(13,680)	(16,331)
Gain on sale and acquisition of real estate joint venture and partnership interests	(879)	(1,718)
Gain on sale of property	(43,917)	(115,989)
Distributions of income from real estate joint ventures and partnerships, net	2,834	2,736
Changes in accrued rent and accounts receivable, net	(7,746)	(3,070)
Changes in unamortized debt and lease costs and other assets, net	(11,794)	(15,952)
Changes in accounts payable, accrued expenses and other liabilities, net	6,946	3,656
Other, net	10,717	3,712
Net cash provided by operating activities	185,733	178,168
Cash Flows from Investing Activities:
Acquisition of real estate and land	(187,069)	0
Development and capital improvements	(59,791)	(77,178)
Proceeds from sale of property and real estate equity investments, net	74,487	169,530
Change in restricted deposits and mortgage escrows	69,396	(31,531)
Notes receivable from real estate joint ventures and partnerships and other receivables - Collections	0	10,316
Real estate joint ventures and partnerships - Investments	(30,053)	(5,185)
Real estate joint ventures and partnerships - Distribution of capital	28,003	18,578
Purchase of investments	0	(3,000)
Proceeds from investments	1,000	51,288
Other, net	(325)	(11,899)
Net cash (used in) provided by investing activities	(104,352)	120,919
Cash Flows from Financing Activities:
Proceeds from issuance of debt	448,083	4,500
Principal payments of debt	(223,930)	(468,011)
Changes in unsecured credit facilities	(67,500)	216,000
Proceeds from issuance of common shares of beneficial interest, net	42,420	1,838
Redemption of preferred shares of beneficial interest	(150,000)	0
Common and preferred dividends paid	(131,866)	(126,477)
Debt issuance and extinguishment costs paid	(9,779)	(400)
Distributions to noncontrolling interests	(4,541)	(5,939)
Contributions from noncontrolling interests	1,318	980
Other, net	3,492	(179)
Net cash used in financing activities	(92,303)	(377,688)
Net decrease in cash and cash equivalents	(10,922)	(78,601)
Cash and cash equivalents at January 1	23,189	91,576
Cash and cash equivalents at September 30	12,267	12,975
Interest paid during the period (net of amount capitalized of $2,517 and $2,232, respectively)	59,333	75,117
Income taxes paid during the period	$ 1,534	$ 1,705