Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net Income	$ 228,840	$ 105,589
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	88,516	84,606
Amortization of debt deferred costs and intangibles, net	1,565	1,421
Impairment loss	0	15,012
Equity in earnings of real estate joint ventures and partnerships, net	(11,311)	(12,747)
Gain on sale of property	(155,998)	(47,987)
Distributions of income from real estate joint ventures and partnerships	8,676	8,978
Changes in accrued rent, accrued contract receivables and accounts receivable, net	10,286	2,370
Changes in unamortized lease costs and other assets, net	(8,282)	(12,241)
Changes in accounts payable, accrued expenses and other liabilities, net	(11,695)	(7,126)
Other, net	(10,835)	2,906
Net cash provided by operating activities	139,762	140,781
Cash Flows from Investing Activities:
Acquisition of real estate and land	(1,265)	(610)
Development and capital improvements	(70,015)	(72,908)
Proceeds from sale of property and real estate equity investments, net	326,319	109,361
Real estate joint ventures and partnerships - Investments	(15,369)	(27,875)
Real estate joint ventures and partnerships - Distribution of capital	3,155	4,156
Purchase of investments	0	(3,491)
Proceeds from investments	1,500	4,000
Other, net	4,454	(323)
Net cash provided by investing activities	248,779	12,310
Cash Flows from Financing Activities:
Proceeds from issuance of debt	638	0
Principal payments of debt	(253,955)	(21,308)
Changes in unsecured credit facilities	0	(44,440)
Proceeds from issuance of common shares of beneficial interest, net	1,603	985
Repurchase of common shares of beneficial interest, net	(18,564)	0
Common share dividends paid	(101,423)	(98,844)
Debt issuance and extinguishment costs paid	(1,183)	(341)
Distributions to noncontrolling interests	(4,593)	(15,799)
Contributions from noncontrolling interests	389	0
Other, net	912	(2,001)
Net cash used in financing activities	(376,176)	(181,748)
Net increase (decrease) in cash, cash equivalents and restricted cash equivalents	12,365	(28,657)
Cash, cash equivalents and restricted cash equivalents at January 1	21,334	41,279
Cash, cash equivalents and restricted cash equivalents at June 30	33,699	12,622
Interest paid during the period (net of amount capitalized of $3,103 and $1,903, respectively)	35,018	40,852
Income taxes paid during the period	$ 1,515	$ 1,009