Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Net Income	$ 282,114	$ 180,062
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	126,558	126,115
Amortization of debt deferred costs and intangibles, net	2,354	2,105
Impairment loss	2,398	15,012
Equity in earnings of real estate joint ventures and partnerships, net	(19,333)	(17,966)
Gain on sale of property	(173,077)	(86,566)
Distributions of income from real estate joint ventures and partnerships	12,817	12,683
Changes in accrued rent, accrued contract receivables and accounts receivable, net	3,459	(10,142)
Changes in unamortized lease costs and other assets, net	(10,697)	(15,237)
Changes in accounts payable, accrued expenses and other liabilities, net	(1,858)	10,664
Other, net	(10,133)	4,529
Net cash provided by operating activities	214,602	221,259
Cash Flows from Investing Activities:
Acquisition of real estate and land	(1,265)	(1,902)
Development and capital improvements	(112,927)	(101,438)
Proceeds from sale of property and real estate equity investments, net	372,439	216,343
Real estate joint ventures and partnerships - Investments	(25,731)	(31,053)
Real estate joint ventures and partnerships - Distribution of capital	4,487	5,759
Purchase of investments	0	(4,241)
Proceeds from investments	1,500	4,250
Other, net	5,180	3,734
Net cash provided by investing activities	243,683	91,452
Cash Flows from Financing Activities:
Proceeds from issuance of debt	638	0
Principal payments of debt	(255,472)	(23,217)
Changes in unsecured credit facilities	0	(120,000)
Proceeds from issuance of common shares of beneficial interest, net	6,729	1,115
Repurchase of common shares of beneficial interest, net	(18,564)	0
Common share dividends paid	(152,110)	(148,286)
Debt issuance and extinguishment costs paid	(1,189)	(395)
Distributions to noncontrolling interests	(15,063)	(16,752)
Contributions from noncontrolling interests	1,324	0
Other, net	869	(2,236)
Net cash used in financing activities	(432,838)	(309,771)
Net increase (decrease) in cash, cash equivalents and restricted cash equivalents	25,447	2,940
Cash, cash equivalents and restricted cash equivalents at January 1	21,334	41,279
Cash, cash equivalents and restricted cash equivalents at September 30	46,781	44,219
Interest paid during the period (net of amount capitalized of $5,387 and $3,314, respectively)	53,890	63,564
Income taxes paid during the period	$ 1,515	$ 1,009